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Exploring biogeochemical and ecological redundancy in phytoplankton communities in the global ocean

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Dutkiewicz, S, Boyd, PW ORCID: 0000-0001-7850-1911 and Riebesell, U 2021 , 'Exploring biogeochemical and ecological redundancy in phytoplankton communities in the global ocean' , Global Change Biology, vol. 27, no. 6 , pp. 1196-1213 , doi: 10.1111/gcb.15493.

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Abstract

Climate-change-induced alterations of oceanic conditions will lead to the ecological niches of some marine phytoplankton species disappearing, at least regionally. How will such losses affect the ecosystem and the coupled biogeochemical cycles? Here, we couch this question in terms of ecological redundancy (will other species be able to fill the ecological roles of the extinct species) and biogeochemical redundancy (can other species replace their biogeochemical roles). Prior laboratory and field studies point to a spectrum in the degree of redundancy. We use a global three-dimensional computer model with diverse planktonic communities to explore these questions further. The model includes 35 phytoplankton types that differ in size, biogeochemical function and trophic strategy. We run two series of experiments in which single phytoplankton types are either partially or fully eliminated. The niches of the targeted types were not completely reoccupied, often with a reduction in the transfer of matter from autotrophs to heterotrophs. Primary production was often decreased, but sometimes increased due to reduction in grazing pressure. Complex trophic interactions (such as a decrease in the stocks of a predator's grazer) led to unexpected reshuffling of the community structure. Alterations in resource utilization may cause impacts beyond the regions where the type went extinct. Our results suggest a lack of redundancy, especially in the ‘knock on’ effects on higher trophic levels. Redundancy appeared lowest for types on the edges of trait space (e.g. smallest) or with unique competitive strategies. Though highly idealized, our modelling findings suggest that the results from laboratory or field studies often do not adequately capture the ramifications of functional redundancy. The modelled, often counterintuitive, responses—via complex food web interactions and bottom-up versus top-down controls—indicate that changes in planktonic community will be key determinants of future ocean global change ecology and biogeochemistry.

Item Type: Article
Authors/Creators:Dutkiewicz, S and Boyd, PW and Riebesell, U
Keywords: phytoplankton, multiple stressors, modelling, function, diversity, trophic interactions
Journal or Publication Title: Global Change Biology
Publisher: Blackwell Publishing Ltd
ISSN: 1354-1013
DOI / ID Number: 10.1111/gcb.15493
Copyright Information:

© 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License, (https://creativecommons.org/licenses/by-nc/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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