CLAIMBOUND / SOURCE-PUBLICATION EVIDENCE
Fisheries
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1. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 4
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For millions of years in Earth history, natural climate change at rates slower than today’s anthropogenic change has led to significant ecosystem shifts (high confidence), including species emergences and extinctions (high confidence).
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 4- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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For millions of years in Earth history, natural climate change at rates slower than today’s anthropogenic change has led to significant ecosystem shifts (high confidence), including species emergences and extinctions (high confidence).
2. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 4
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Contemporary multi-decadal natural climate variations associated with regional transient warming periods by 1°C have led to fundamental restructuring of ecosystems and large socioeconomic implications (high confidence). {6.1.2, 6.3.1, 6.4} Vulnerability of most organisms to warming is set by their physiology, which defines their limited temperature ranges and hence their thermal sensitivity (high confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 4- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Contemporary multi-decadal natural climate variations associated with regional transient warming periods by 1°C have led to fundamental restructuring of ecosystems and large socioeconomic implications (high confidence). {6.1.2, 6.3.1, 6.4} Vulnerability of most organisms to warming is set by their physiology, which defines their limited temperature ranges and hence their thermal sensitivity (high confidence).
3. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 4
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Although genetic adaptation occurs (medium confidence), the capacity of present-day fauna and flora to compensate for or keep up with the rate of ongoing thermal change is limited (low confidence). {6.3.1, 6.3.5, 6.5.2} The warming-induced shifts in the abundance, geographic distribution, migration patterns, and timing of seasonal activities of species (very high confidence) have been and will be paralleled by a reduction in their maximum body size (medium confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 4- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Although genetic adaptation occurs (medium confidence), the capacity of present-day fauna and flora to compensate for or keep up with the rate of ongoing thermal change is limited (low confidence). {6.3.1, 6.3.5, 6.5.2} The warming-induced shifts in the abundance, geographic distribution, migration patterns, and timing of seasonal activities of species (very high confidence) have been and will be paralleled by a reduction in their maximum body size (medium confidence).
4. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 4
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This has resulted and will further result in changing interactions between species, including competition and predator-prey dynamics (high confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 4- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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This has resulted and will further result in changing interactions between species, including competition and predator-prey dynamics (high confidence).
5. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 4
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While marine reptiles such as turtles encounter direct effects of warming, impacts to seabirds and marine mammals are mostly indirect through effects of warming on their prey (high confidence). {6.3.1, 6.3.7, 6.5, Boxes CC-CR, CC-MB} In response to further warming by 1°C or more by the mid-21st century and beyond, ocean-wide changes in ecosystem properties are projected to continue (high confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 4- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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While marine reptiles such as turtles encounter direct effects of warming, impacts to seabirds and marine mammals are mostly indirect through effects of warming on their prey (high confidence). {6.3.1, 6.3.7, 6.5, Boxes CC-CR, CC-MB} In response to further warming by 1°C or more by the mid-21st century and beyond, ocean-wide changes in ecosystem properties are projected to continue (high confidence).
6. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 4
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Large irreversible shifts in the spatial distribution of species and seasonal timing of their activities (feeding, growth, development, behaviors, and productivity) will have implications for species composition, and ecosystem goods and services. {6.3.1, 6.4, 6.5, 6.6} By the mid-21st century, the spatial shifts of marine species will cause species richness to increase at mid- and high latitudes (high confidence) and to decrease at tropical latitudes (medium confidence), resulting in global redistribution of catch potential for fishes and invertebrates, with implications for food security (medium confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 4- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Large irreversible shifts in the spatial distribution of species and seasonal timing of their activities (feeding, growth, development, behaviors, and productivity) will have implications for species composition, and ecosystem goods and services. {6.3.1, 6.4, 6.5, 6.6} By the mid-21st century, the spatial shifts of marine species will cause species richness to increase at mid- and high latitudes (high confidence) and to decrease at tropical latitudes (medium confidence), resulting in global redistribution of catch potential for fishes and invertebrates, with implications for food security (medium confidence).
7. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 5
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If a decrease in global net primary production (NPP) or a shift toward smaller primary producers occurs, the overall fisheries catch potential may also decrease. {6.3.1-4, 6.4.1, 6.5.1-4} Open ocean NPP is projected to fall globally depending on RCP scenario (medium confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 5- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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If a decrease in global net primary production (NPP) or a shift toward smaller primary producers occurs, the overall fisheries catch potential may also decrease. {6.3.1-4, 6.4.1, 6.5.1-4} Open ocean NPP is projected to fall globally depending on RCP scenario (medium confidence).
8. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 5
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The oceans currently provide about half of global NPP.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 5- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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The oceans currently provide about half of global NPP.
9. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 5
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Impacts of ocean acidification range from changes in organismal physiology and behavior to population dynamics (mediumto high confidence) and will affect marine ecosystems for centuries if emissions continue (high confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 5- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Impacts of ocean acidification range from changes in organismal physiology and behavior to population dynamics (mediumto high confidence) and will affect marine ecosystems for centuries if emissions continue (high confidence).
10. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 5
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Limits to adaptive capacity exist but remain largely unexplored. {6.3.2, Box CC-OA} Few field observations conducted in the last decade demonstrate biotic responses attributable to anthropogenic ocean acidification, as in many places these responses are not yet outside their natural variability and may be influenced by confounding local or regional factors.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 5- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Limits to adaptive capacity exist but remain largely unexplored. {6.3.2, Box CC-OA} Few field observations conducted in the last decade demonstrate biotic responses attributable to anthropogenic ocean acidification, as in many places these responses are not yet outside their natural variability and may be influenced by confounding local or regional factors.
11. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 6
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These OMZs are also characterized by microbial removal of fixed nitrogen (denitrification), which can significantly reduce the low-latitude nutrient inventories with implications for regional productivity. {6.3.3, 6.3.5} The climate-change-induced intensification of ocean upwelling in some eastern boundary systems, as observed in the last decades, may lead to regional cooling rather than warming of surface waters and cause enhanced productivity (medium confidence), but also enhanced hypoxia, acidification, and associated biomass reduction in fish and invertebrate stocks.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 6- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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These OMZs are also characterized by microbial removal of fixed nitrogen (denitrification), which can significantly reduce the low-latitude nutrient inventories with implications for regional productivity. {6.3.3, 6.3.5} The climate-change-induced intensification of ocean upwelling in some eastern boundary systems, as observed in the last decades, may lead to regional cooling rather than warming of surface waters and cause enhanced productivity (medium confidence), but also enhanced hypoxia, acidification, and associated biomass reduction in fish and invertebrate stocks.
12. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 6
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Owing to contradictory observations there is currently uncertainty about the future trends of major upwelling systems and how their drivers (enhanced productivity, acidification, and hypoxia) will shape ecosystem characteristics (low confidence). {6.1.1, 6.3.2, 6.3.3, 6.3.5-6, Box CC-UP} Environmental drivers acting simultaneously on ocean biota* often lead to interactive effects and complex responses (high confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 6- Captured
- 2026-09-05
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Owing to contradictory observations there is currently uncertainty about the future trends of major upwelling systems and how their drivers (enhanced productivity, acidification, and hypoxia) will shape ecosystem characteristics (low confidence). {6.1.1, 6.3.2, 6.3.3, 6.3.5-6, Box CC-UP} Environmental drivers acting simultaneously on ocean biota* often lead to interactive effects and complex responses (high confidence).
13. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 6
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Socioeconomic vulnerability is highest in developing tropical countries involving a risk of reduced supplies, income, and employment from marine fisheries (high confidence).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 6- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Socioeconomic vulnerability is highest in developing tropical countries involving a risk of reduced supplies, income, and employment from marine fisheries (high confidence).
14. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 6
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This emphasizes disparities in food security between developed and underdeveloped nations. {6.4.1, 6.5} With continuing climate change, local adaptation measures (such as conservation) or a reduction in human activities (such as fishing) may not sufficiently offset global-scale effects on marine ecosystems (high confidence).
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 6- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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This emphasizes disparities in food security between developed and underdeveloped nations. {6.4.1, 6.5} With continuing climate change, local adaptation measures (such as conservation) or a reduction in human activities (such as fishing) may not sufficiently offset global-scale effects on marine ecosystems (high confidence).
15. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 7
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Oceans are home to species and ecosystems valued in tourism and for recreation.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 7- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Oceans are home to species and ecosystems valued in tourism and for recreation.
16. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 7
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The rich biodiversity of the oceans offers resources for innovative drugs or biomechanics.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 7- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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The rich biodiversity of the oceans offers resources for innovative drugs or biomechanics.
17. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 7
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About 90% of the goods the world uses are shipped across the oceans.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 7- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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About 90% of the goods the world uses are shipped across the oceans.
18. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 7
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These changes all pose risks for marine life and may affect the oceans’ ability to perform the wide range of functions that are vitally important for environmental and human health.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 7- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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These changes all pose risks for marine life and may affect the oceans’ ability to perform the wide range of functions that are vitally important for environmental and human health.
19. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 8
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These minerals are important components of shells and skeletons of many marine organisms (Section 6.3.2).
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 8- Captured
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1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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These minerals are important components of shells and skeletons of many marine organisms (Section 6.3.2).
20. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 10
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In the surface ocean, the depth of the mixed layer (solid horizontal line) will shallow resulting in higher mean light levels.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 10- Captured
- 2026-09-05
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In the surface ocean, the depth of the mixed layer (solid horizontal line) will shallow resulting in higher mean light levels.
21. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 11
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Such data sets are rare and regionally biased.
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- 2026-09-05
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22. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 12
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Episodes of largest environmental change are indicated with darker bands.
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- 2026-09-05
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Episodes of largest environmental change are indicated with darker bands.
23. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 12
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While there was extinction during the PETM (Thomas, 2003), there is currently no evidence for climate-related extinction in the marine record.
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- 2026-09-05
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While there was extinction during the PETM (Thomas, 2003), there is currently no evidence for climate-related extinction in the marine record.
24. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 12
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Pictures are examples of organisms highlighting the processes in each panel, and are not to scale.
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- 2026-09-05
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Pictures are examples of organisms highlighting the processes in each panel, and are not to scale.
25. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 14
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These data inform us which taxonomic groups in what regions are more susceptible to climate change (Boyd et al., 2011).
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 14- Captured
- 2026-09-05
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These data inform us which taxonomic groups in what regions are more susceptible to climate change (Boyd et al., 2011).
26. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 16
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It offers large-scale aquatic habitats, diverse bottom topography, and a rich diversity of species and ecosystems in water in various climate zones that are found nowhere else.
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PDF page 16- Captured
- 2026-09-05
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It offers large-scale aquatic habitats, diverse bottom topography, and a rich diversity of species and ecosystems in water in various climate zones that are found nowhere else.
27. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 16
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State-of-the-art ecosystem models build on empirical observations of past climate changes and enable development of estimates of how ocean life may react in the future.
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PDF page 16- Captured
- 2026-09-05
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State-of-the-art ecosystem models build on empirical observations of past climate changes and enable development of estimates of how ocean life may react in the future.
28. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 16
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It is known, however, that the resilience of marine ecosystems to adjust to climate change impacts is likelyto be reduced by both the range of factors and their rate of change.
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PDF page 16- Captured
- 2026-09-05
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It is known, however, that the resilience of marine ecosystems to adjust to climate change impacts is likelyto be reduced by both the range of factors and their rate of change.
29. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 16
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The current rate of environmental change is much faster than most climate changes in the Earth’s history, so predictions from longer term geological records may not be applicable if the changes occur within a few generations of a species.
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The current rate of environmental change is much faster than most climate changes in the Earth’s history, so predictions from longer term geological records may not be applicable if the changes occur within a few generations of a species.
30. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 17
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All organisms including marine ones have limited temperature ranges within which they live and function.
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- 2026-09-05
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All organisms including marine ones have limited temperature ranges within which they live and function.
31. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 18
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High organizational complexity is hypothesized to be associated with decreasing tolerance to heat and to enable an increase in body size which in turn, decreases heat tolerance further (Sorokin and Kraus, 1962; Chevaldonné et al., 2000; Alker et al., 2001; Baumgartner et al., 2002; Pörtner, 2002a,b; Campbell et al., 2006; De Jonckheere et al., 2009, 2011).
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PDF page 18- Captured
- 2026-09-05
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High organizational complexity is hypothesized to be associated with decreasing tolerance to heat and to enable an increase in body size which in turn, decreases heat tolerance further (Sorokin and Kraus, 1962; Chevaldonné et al., 2000; Alker et al., 2001; Baumgartner et al., 2002; Pörtner, 2002a,b; Campbell et al., 2006; De Jonckheere et al., 2009, 2011).
32. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 18
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In the domain Bacteria, the Thermotogales are less complex and most tolerant to high temperatures (Huber et al., 1986; Tenreiro et al., 1997; Takai et al., 1999; Ventura et al., 2000; Abed et al., 2002).
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 18- Captured
- 2026-09-05
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In the domain Bacteria, the Thermotogales are less complex and most tolerant to high temperatures (Huber et al., 1986; Tenreiro et al., 1997; Takai et al., 1999; Ventura et al., 2000; Abed et al., 2002).
33. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 19
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The temperature range at which animals can function best results from optimal oxygen supply at minimal oxygen usage.
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PDF page 19- Captured
- 2026-09-05
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The temperature range at which animals can function best results from optimal oxygen supply at minimal oxygen usage.
34. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 22
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Global outbreak frequencies of jellyfish aggregations may follow rising sea surface temperatures (SSTs) (low confidence; Mills, 2001; Purcell and Decker, 2005), but evidence is inconclusive.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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PDF page 22- Captured
- 2026-09-05
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Global outbreak frequencies of jellyfish aggregations may follow rising sea surface temperatures (SSTs) (low confidence; Mills, 2001; Purcell and Decker, 2005), but evidence is inconclusive.
35. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 22
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Water column characteristics or photoperiod may overrule temperature control in some organisms (e.g., diatoms), limiting northward displacement.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 22- Captured
- 2026-09-05
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Water column characteristics or photoperiod may overrule temperature control in some organisms (e.g., diatoms), limiting northward displacement.
36. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 23
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The location of the critical thermal boundary (9°C to 10°C) is indicated by “+.” (e) Long-term changes in the mean number of warm-temperate pseudo-oceanic species from 1958 to 2005.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 23- Captured
- 2026-09-05
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The location of the critical thermal boundary (9°C to 10°C) is indicated by “+.” (e) Long-term changes in the mean number of warm-temperate pseudo-oceanic species from 1958 to 2005.
37. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 23
Narrow public claim
The period 1958–1981 was a period of relative stability and the period 1982–1999 was a period of rapid northward shifts, indicating that the abrupt ecosystem shift observed in the North Sea was part of a large-scale response of the zooplankton biodiversity to warming temperatures (see a–d).
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 23- Captured
- 2026-09-05
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The period 1958–1981 was a period of relative stability and the period 1982–1999 was a period of rapid northward shifts, indicating that the abrupt ecosystem shift observed in the North Sea was part of a large-scale response of the zooplankton biodiversity to warming temperatures (see a–d).
38. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 23
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Average values are below 1 because they are annual averages.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 23- Captured
- 2026-09-05
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Average values are below 1 because they are annual averages.
39. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 23
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Note that the color bar is 10-fold smaller for warm-temperate pseudo-oceanic species because these species are less frequently observed than their temperate counterparts.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 23- Captured
- 2026-09-05
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Note that the color bar is 10-fold smaller for warm-temperate pseudo-oceanic species because these species are less frequently observed than their temperate counterparts.
40. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 24
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In cooler regions, increased phytoplankton activity caused by warming favored growth, resulting in the observed increase in phytoplankton biomass, whereas a decrease in nutrient supply would have prevented growth in warmer regions and caused a decrease in biomass (Richardson and Schoeman, 2004; see also Section 6.3.4).
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 24- Captured
- 2026-09-05
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In cooler regions, increased phytoplankton activity caused by warming favored growth, resulting in the observed increase in phytoplankton biomass, whereas a decrease in nutrient supply would have prevented growth in warmer regions and caused a decrease in biomass (Richardson and Schoeman, 2004; see also Section 6.3.4).
41. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 24
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There was a general poleward shift and range expansion of many commercial (e.g., Atlantic herring, Atlantic cod, haddock) and non-commercial species, reversed during the subsequent cooling period.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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PDF page 24- Captured
- 2026-09-05
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There was a general poleward shift and range expansion of many commercial (e.g., Atlantic herring, Atlantic cod, haddock) and non-commercial species, reversed during the subsequent cooling period.
42. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 24
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Higher NPP supported and is projected to support higher trophic levels at high latitudes (c,d; Section 6.3.4).
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- IPCC AR5 WGII Chapter 6 Ocean Systems
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- 2026-09-05
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Higher NPP supported and is projected to support higher trophic levels at high latitudes (c,d; Section 6.3.4).
43. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 24
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Note that climate variability will be superimposed on anthropogenic warming (b; see Figures 6-1, 6-8a,b).
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Note that climate variability will be superimposed on anthropogenic warming (b; see Figures 6-1, 6-8a,b).
44. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 25
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In line with the increased understanding of physiology (Section 6.3.1.1), warming in the temperate to polar North Atlantic was paralleled by a reduction in the average body lengths of about 100 copepod species, from 3 to 4 mm to 2 to mm (Beaugrand et al., 2010).
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In line with the increased understanding of physiology (Section 6.3.1.1), warming in the temperate to polar North Atlantic was paralleled by a reduction in the average body lengths of about 100 copepod species, from 3 to 4 mm to 2 to mm (Beaugrand et al., 2010).
45. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 25
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In diatoms, which are major contributors to carbon export (Armbrust, 2009), warming and decreasing annual variability in SST resulted in lower diversity, smaller size, and reduced abundance (Beaugrand et al., 2010).
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In diatoms, which are major contributors to carbon export (Armbrust, 2009), warming and decreasing annual variability in SST resulted in lower diversity, smaller size, and reduced abundance (Beaugrand et al., 2010).
46. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 25
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The ecosystem regime shift observed in North Sea plankton in the late 1980s involved an increase in phytoplankton stocks and changes in species composition and abundance among holozooplankton (animals that are planktonic for their entire lifecycle) (Reid et al., 2001; Kirby and Beaugrand, 2009; Kirby et al., 2009; Lindley et al., 2010).
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The ecosystem regime shift observed in North Sea plankton in the late 1980s involved an increase in phytoplankton stocks and changes in species composition and abundance among holozooplankton (animals that are planktonic for their entire lifecycle) (Reid et al., 2001; Kirby and Beaugrand, 2009; Kirby et al., 2009; Lindley et al., 2010).
47. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 25
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Similar trends were observed due to warming by 1°C to 2°C in the waters south and west of Iceland during the past 15 years (Valdimarsson et al., 2012).
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Similar trends were observed due to warming by 1°C to 2°C in the waters south and west of Iceland during the past 15 years (Valdimarsson et al., 2012).
48. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 25
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In the Northwest Atlantic cooling and freshening occurred during the late 1980s to early 1990s and seemed to have the opposite effect, as capelin and their predator, Atlantic cod, shifted farther south (Rose and O'Driscoll, 2002).
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In the Northwest Atlantic cooling and freshening occurred during the late 1980s to early 1990s and seemed to have the opposite effect, as capelin and their predator, Atlantic cod, shifted farther south (Rose and O'Driscoll, 2002).
49. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 25
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Although temperatures have risen on the Newfoundland Shelf (Colbourne et al., 2011), capelin and cod remain scarce for reasons probably unrelated to climate (DFO, 2011a,b).
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Although temperatures have risen on the Newfoundland Shelf (Colbourne et al., 2011), capelin and cod remain scarce for reasons probably unrelated to climate (DFO, 2011a,b).
50. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 26
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Exposure of external shells to more acidic water can affect their stability by weakening or actually dissolving carbonate structures.
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Exposure of external shells to more acidic water can affect their stability by weakening or actually dissolving carbonate structures.
51. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 26
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Some of these shells are shielded from direct contact with seawater by a special coating that the animal makes (as is the case in mussels).
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Some of these shells are shielded from direct contact with seawater by a special coating that the animal makes (as is the case in mussels).
52. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 33
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Natural analogs and laboratory and mesocosm experiments provide evidence for differential effects of ocean acidification on species and communities.
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Natural analogs and laboratory and mesocosm experiments provide evidence for differential effects of ocean acidification on species and communities.
53. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 36
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Unknown denotes no published information is available for each of these categories.
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Unknown denotes no published information is available for each of these categories.
54. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 36
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Lab cultures show how altered pH elicits different responses of coccolithophore species (Langer et al., 2006).
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Lab cultures show how altered pH elicits different responses of coccolithophore species (Langer et al., 2006).
55. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 37
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In turn, tropical species may be more sensitive than temperate zone species (Pörtner et al., 2011).
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In turn, tropical species may be more sensitive than temperate zone species (Pörtner et al., 2011).
56. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 39
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A coupled pelagic and benthic food web is structured by the body size spectrum of species.
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A coupled pelagic and benthic food web is structured by the body size spectrum of species.
57. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 41
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Overall, climate change will lead to large-scale shifts in the patterns of marine productivity, biodiversity, community composition, and ecosystem structure.
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PDF page 41- Captured
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Overall, climate change will lead to large-scale shifts in the patterns of marine productivity, biodiversity, community composition, and ecosystem structure.
58. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 41
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In particular, the impacts of climate change on vulnerable organisms such as warm water corals are expected to affect associated ecosystems, such as coral reef communities.
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PDF page 41- Captured
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In particular, the impacts of climate change on vulnerable organisms such as warm water corals are expected to affect associated ecosystems, such as coral reef communities.
59. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 41
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Alteration of the biology, distribution, and seasonal activity of marine organisms will disturb food web interactions such as the grazing of copepods (tiny crustaceans) on planktonic algae, another important foundational level of the marine food chain.
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PDF page 41- Captured
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Alteration of the biology, distribution, and seasonal activity of marine organisms will disturb food web interactions such as the grazing of copepods (tiny crustaceans) on planktonic algae, another important foundational level of the marine food chain.
60. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 41
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Organisms less likely to shift to higher latitudes because they are more tolerant of the direct effects of climate change or less mobile may also be affected because climate change will alter the existing food webs on which they depend.
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PDF page 41- Captured
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Organisms less likely to shift to higher latitudes because they are more tolerant of the direct effects of climate change or less mobile may also be affected because climate change will alter the existing food webs on which they depend.
61. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 42
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Such loss is felt most strongly in the respective regions.
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PDF page 42- Captured
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Such loss is felt most strongly in the respective regions.
62. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 44
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A particular risk is that climate change may contribute to large-scale ecosystem regime shifts (Section 6.3.1.5; Box 6-1).
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PDF page 44- Captured
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A particular risk is that climate change may contribute to large-scale ecosystem regime shifts (Section 6.3.1.5; Box 6-1).
63. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 48
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Whenever the shift in distribution does not fully compensate for warming and hypoxia, the result will be a decrease in body size.
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The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
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Whenever the shift in distribution does not fully compensate for warming and hypoxia, the result will be a decrease in body size.
64. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 48
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Catch potential is determined by species range and net primary production.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 48- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
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Repeat this exact check locally
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python scripts/verify_primary_public_claim_group.py artifacts/cb7k_dom059_t07_primary_claims.json --source-file <local-raw-pdf>Exact source quote
Catch potential is determined by species range and net primary production.
65. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 51
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Effects (MAE), that is, on animals and plants.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 51- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
- Maintainer run only; no independent operator rerun is registered.
Repeat this exact check locally
Download the PDF to a local file, then run the committed verifier. A changed PDF is reported as drift rather than silently accepted.
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66. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 52
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Risk levels are presented for the near-term era of committed climate change (here, for 2030–2040), in which projected levels of global mean temperature increase do not diverge substantially across emissions scenarios.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 52- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
- Maintainer run only; no independent operator rerun is registered.
Repeat this exact check locally
Download the PDF to a local file, then run the committed verifier. A changed PDF is reported as drift rather than silently accepted.
python scripts/verify_primary_public_claim_group.py artifacts/cb7k_dom059_t07_primary_claims.json --source-file <local-raw-pdf>Exact source quote
Risk levels are presented for the near-term era of committed climate change (here, for 2030–2040), in which projected levels of global mean temperature increase do not diverge substantially across emissions scenarios.
67. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 52
Narrow public claim
Risk levels are also presented for the longer-term era of climate options (here, for 2080–2100), for global mean temperature increase of 2°C and 4°C above pre-industrial levels.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 52- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
- Maintainer run only; no independent operator rerun is registered.
Repeat this exact check locally
Download the PDF to a local file, then run the committed verifier. A changed PDF is reported as drift rather than silently accepted.
python scripts/verify_primary_public_claim_group.py artifacts/cb7k_dom059_t07_primary_claims.json --source-file <local-raw-pdf>Exact source quote
Risk levels are also presented for the longer-term era of climate options (here, for 2080–2100), for global mean temperature increase of 2°C and 4°C above pre-industrial levels.
68. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 52
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For each time frame, risk levels are estimated for the current state of adaptation and for a hypothetical highly adapted state.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 52- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
- Maintainer run only; no independent operator rerun is registered.
Repeat this exact check locally
Download the PDF to a local file, then run the committed verifier. A changed PDF is reported as drift rather than silently accepted.
python scripts/verify_primary_public_claim_group.py artifacts/cb7k_dom059_t07_primary_claims.json --source-file <local-raw-pdf>Exact source quote
For each time frame, risk levels are estimated for the current state of adaptation and for a hypothetical highly adapted state.
69. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 52
Narrow public claim
Acronyms for oceans sub-regions are as follows: HLSBS = High-Latitude Spring Bloom Systems; EUS = Equatorial Upwelling Systems; SES = Semi-Enclosed Seas; CBS = Coastal Boundary Systems; EBUE = Eastern Boundary Upwelling Ecosystems; STG = Sub-Tropical Gyres, DS = Deep Sea (>1000 m).
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 52- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
- Maintainer run only; no independent operator rerun is registered.
Repeat this exact check locally
Download the PDF to a local file, then run the committed verifier. A changed PDF is reported as drift rather than silently accepted.
python scripts/verify_primary_public_claim_group.py artifacts/cb7k_dom059_t07_primary_claims.json --source-file <local-raw-pdf>Exact source quote
Acronyms for oceans sub-regions are as follows: HLSBS = High-Latitude Spring Bloom Systems; EUS = Equatorial Upwelling Systems; SES = Semi-Enclosed Seas; CBS = Coastal Boundary Systems; EBUE = Eastern Boundary Upwelling Ecosystems; STG = Sub-Tropical Gyres, DS = Deep Sea (>1000 m).
70. IPCC AR5 WGII Chapter 6 Ocean Systems · PDF page 59
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Science Advisory Report 2010/090, CSAS, Ottawa, Ontario, Canada, 16 pp.
What this card proves
The exact quoted statement occurred in the named official PDF fetched on 2026-09-05, and the complete PDF matched the recorded SHA-256.
What this card does not prove
It does not independently establish the underlying model capability, safety, comparison, or real-world truth. This is a retrospective single-maintainer source-publication audit.
- Primary source
- IPCC AR5 WGII Chapter 6 Ocean Systems
- Section locator
PDF page 59- Captured
- 2026-09-05
- Source SHA-256
1726eeab69f54503656c99dbb769b3c0c074ebd749801da236a5e2782c9ef372- Reproduction
- Maintainer run only; no independent operator rerun is registered.
Repeat this exact check locally
Download the PDF to a local file, then run the committed verifier. A changed PDF is reported as drift rather than silently accepted.
python scripts/verify_primary_public_claim_group.py artifacts/cb7k_dom059_t07_primary_claims.json --source-file <local-raw-pdf>Exact source quote
Science Advisory Report 2010/090, CSAS, Ottawa, Ontario, Canada, 16 pp.