Demersal fish biomass declines with temperature across productive shelf seas

Author:

van Denderen Daniel12ORCID,Maureaud Aurore A.34ORCID,Andersen Ken H.2ORCID,Gaichas Sarah5ORCID,Lindegren Martin2ORCID,Petrik Colleen M.6ORCID,Stock Charles A.7ORCID,Collie Jeremy1ORCID

Affiliation:

1. Graduate School of Oceanography, University of Rhode Island Narragansett Rhode Island USA

2. Centre for Ocean Life, DTU Aqua Technical University of Denmark Lyngby Denmark

3. Center for Biodiversity & Global Change Yale University New Haven Connecticut USA

4. Department of Ecology & Evolutionary Biology Yale University New Haven Connecticut USA

5. Northeast Fisheries Science Center NOAA Woods Hole Massachusetts USA

6. Scripps Institution of Oceanography, University of California San Diego California USA

7. Geophysical Fluid Dynamics Laboratory NOAA Princeton New Jersey USA

Abstract

AbstractAimTheory predicts fish community biomass to decline with increasing temperature due to higher metabolic losses resulting in less efficient energy transfer in warm‐water food webs. However, whether these metabolic predictions explain observed macroecological patterns in fish community biomass is virtually unknown. Here, we test these predictions by examining the variation in demersal fish biomass across productive shelf regions.LocationTwenty one continental shelf regions in the North Atlantic and Northeast Pacific.Time Period1980–2015.Major Taxa StudiedMarine teleost fish and elasmobranchs.MethodsWe compiled high‐resolution bottom trawl survey data of fish biomass containing 166,000 unique tows and corrected biomass for differences in sampling area and trawl gear catchability. We examined whether relationships between net primary production and demersal fish community biomass are mediated by temperature, food‐web structure and the level of fishing exploitation, as well as the choice of spatial scale of the analysis. Subsequently, we examined if temperature explains regional changes in fish biomass over time under recent warming.ResultsWe find that biomass per km2 varies 40‐fold across regions and is highest in cold waters and areas with low fishing exploitation. We find no evidence that temperature change has impacted biomass within marine regions over the time period considered. The biomass variation is best explained by an elementary trophodynamic model that accounts for temperature‐dependent trophic efficiency.Main ConclusionsOur study supports the hypothesis that temperature is a main driver of large‐scale cross‐regional variation in fish community biomass. The cross‐regional pattern suggests that long‐term impacts of warming will be negative on biomass. These results provide an empirical basis for predicting future changes in fish community biomass and its associated services for human wellbeing that is food provisioning, under global climate change.

Funder

Horizon 2020 Framework Programme

National Oceanic and Atmospheric Administration

V. Kann Rasmussen Foundation

Publisher

Wiley

Subject

Ecology,Ecology, Evolution, Behavior and Systematics,Global and Planetary Change

Reference58 articles.

1. Amante C. &Eakins B.(2009).ETOPO1 1 arc‐minute global relief model: Procedures data sources and analysis. ETOPO1 1 arc‐minute global relief model: Procedures data sources and analysis. NOAA Technical Memorandum NESDIS NGD‐C24.

2. Bottom trawl fishing footprints on the world’s continental shelves

3. Fisheries Governance Affecting Conservation Outcomes in the United States and European Union

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