ORCID Profile
0000-0002-5788-3073
Current Organisation
National Marine Fisheries Service Northeast Fisheries Science Center
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Publisher: Elsevier BV
Date: 05-2023
Publisher: Oxford University Press (OUP)
Date: 17-04-2019
Publisher: Springer Science and Business Media LLC
Date: 15-09-2022
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 03-2017
Publisher: Wiley
Date: 13-07-2023
DOI: 10.1111/GEB.13732
Abstract: Theory 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. Twenty one continental shelf regions in the North Atlantic and Northeast Pacific. 1980–2015. Marine teleost fish and elasmobranchs. We compiled high‐resolution bottom trawl survey data of fish biomass containing 166,000 unique tows and corrected biomass for differences in s ling 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. We find that biomass per km 2 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. Our 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.
Location: United States of America
Location: United States of America
Location: United States of America
Location: United States of America
No related grants have been discovered for Sarah Gaichas.