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Potential impacts of climate change on marine wild capture fisheries: an update

Published online by Cambridge University Press:  23 December 2010

R. I. PERRY
R. I. PERRY*
Affiliation:
Fisheries and Oceans Canada, Pacific Biological Station, Nanaimo, BC V9T 6N7, Canada
*
*Email: Ian.Perry@dfo-mpo.gc.ca
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Summary

This paper provides a brief update on the potential impacts of climate change on marine ecosystems and marine wild capture fisheries based on the scientific literature published since 2007. Current models predict shifts in fish distributions of 45–60 km per decade, with 0·80 of species moving poleward. With a high CO2 emissions scenario, little overall change in the global maximum potential fisheries catch is projected (±1%), although with high spatial variability: decreases of 40% are projected for the tropics, with increases of 30–70% for higher latitudes. Tropical nations appear to be most vulnerable to the impacts of climate change on fisheries production. Coupled atmosphere–ocean–fish production–human society models are beginning to be developed for specific market systems. Results suggest that how society responds can have as large or larger an effect as the strength of the climate impact. Good observations of the impacts of climate change exist for high latitude, coral reef and North Atlantic systems. Management strategies are being developed to address climate change and fisheries, including risk and vulnerability assessment frameworks, pro-active planning with stakeholders regarding potential impacts and responses and examining existing regulations to identify gaps created by altered species distributions (e.g. unregulated fishing in newly ice-free areas). Overall, fisheries governance systems are needed which are flexible and can quickly adapt to changing ecological and human societal conditions. Significant knowledge gaps include a comprehensive and co-ordinated global network of observations to help distinguish climate change from variability, and increased detail in the structure and processes of models. Necessary next steps include reducing the uncertainties of climate impacts models at present, understanding the synergistic effects of multiple stressors and the inclusion of humans into coupled models and socio-economic analyses, in particular at regional and local scales. In the intermediate term, developing nations in tropical regions are likely to be most negatively impacted, whereas developed nations at higher latitudes are most likely to benefit. In the longer term, overall marine food security will depend on the impacts of climate change on marine primary production, for which the present projections are highly uncertain. Adoption of an integrated social–ecological approach that improves the adaptive capacities of ecological and human social systems will help to sustain food security from marine wild capture fisheries.

Type
Foresight Project on Global Food and Farming Futures
Information
The Journal of Agricultural Science , Volume 149 , Issue S1: FORESIGHT PROJECT ON GLOBAL FOOD AND FARMING FUTURES , February 2011 , pp. 63 - 75
Copyright
© Crown Copyright. Published by Cambridge University Press 2010

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