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Changes in sea floor productivity are crucial to understanding the impact of climate change in temperate coastal ecosystems according to a new size-based model.
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- Author(s): Audzijonyte, Asta1,2 (AUTHOR) ; Delius, Gustav W.3 (AUTHOR) ; Stuart-Smith, Rick D.1 (AUTHOR); Novaglio, Camilla1,2 (AUTHOR); Edgar, Graham J.1 (AUTHOR); Barrett, Neville S.1 (AUTHOR); Blanchard, Julia L.1,2 (AUTHOR)
- Source:
PLoS Biology. 12/11/2023, Vol. 21 Issue 12, p1-28. 28p.- Subject Terms:
- Source:
- Additional Information
- Abstract: The multifaceted effects of climate change on physical and biogeochemical processes are rapidly altering marine ecosystems but often are considered in isolation, leaving our understanding of interactions between these drivers of ecosystem change relatively poor. This is particularly true for shallow coastal ecosystems, which are fuelled by a combination of distinct pelagic and benthic energy pathways that may respond to climate change in fundamentally distinct ways. The fish production supported by these systems is likely to be impacted by climate change differently to those of offshore and shelf ecosystems, which have relatively simpler food webs and mostly lack benthic primary production sources. We developed a novel, multispecies size spectrum model for shallow coastal reefs, specifically designed to simulate potential interactive outcomes of changing benthic and pelagic energy inputs and temperatures and calculate the relative importance of these variables for the fish community. Our model, calibrated using field data from an extensive temperate reef monitoring program, predicts that changes in resource levels will have much stronger impacts on fish biomass and yields than changes driven by physiological responses to temperature. Under increased plankton abundance, species in all fish trophic groups were predicted to increase in biomass, average size, and yields. By contrast, changes in benthic resources produced variable responses across fish trophic groups. Increased benthic resources led to increasing benthivorous and piscivorous fish biomasses, yields, and mean body sizes, but biomass decreases among herbivore and planktivore species. When resource changes were combined with warming seas, physiological responses generally decreased species' biomass and yields. Our results suggest that understanding changes in benthic production and its implications for coastal fisheries should be a priority research area. Our modified size spectrum model provides a framework for further study of benthic and pelagic energy pathways that can be easily adapted to other ecosystems. The multifaceted effects of climate change on physical and biogeochemical processes are rapidly altering marine ecosystems. This size-based modelling study shows that the source, size and abundance of primary and secondary producers are critical to understanding impacts of global heating on coastal fish communities. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of PLoS Biology is the property of Public Library of Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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