Ocean climate and hydrodynamics drive decadal shifts in Northeast Atlantic dinoflagellates.

Autor: Kléparski L; UMR 8187-LOG-Laboratoire d'Océanologie et de Géosciences, Univ. Littoral Côte d'Opale, CNRS, Univ. Lille, Wimereux, France.; Continuous Plankton Recorder Survey, Marine Biological Association, Plymouth, UK., Beaugrand G; UMR 8187-LOG-Laboratoire d'Océanologie et de Géosciences, Univ. Littoral Côte d'Opale, CNRS, Univ. Lille, Wimereux, France., Ostle C; Continuous Plankton Recorder Survey, Marine Biological Association, Plymouth, UK., Edwards M; Plymouth Marine Laboratory, Plymouth, UK.; School of Biological and Marine Sciences, University of Plymouth, Plymouth, UK., Skogen MD; Institute of Marine Research, Bergen, Norway., Djeghri N; Continuous Plankton Recorder Survey, Marine Biological Association, Plymouth, UK., Hátún H; Faroe Marine Research Institute, Tórshavn, Faroe Islands.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2024 Feb; Vol. 30 (2), pp. e17163.
DOI: 10.1111/gcb.17163
Abstrakt: The abundance of large marine dinoflagellates has declined in the North Sea since 1958. Although hypotheses have been proposed to explain this diminution (increasing temperature and wind), the mechanisms behind this pattern have thus far remained elusive. In this article, we study the long-term changes in dinoflagellate biomass and biodiversity in relation to hydro-climatic conditions and circulation within the North Atlantic. Our results show that the decline in biomass has paralleled an increase in biodiversity caused by a temperature-induced northward movement of subtropical taxa along the European shelf-edge, and facilitated by changes in oceanic circulation (subpolar gyre contraction). However, major changes in North Atlantic hydrodynamics in the 2010s (subpolar gyre expansion and low-salinity anomaly) stopped this movement, which triggered a biodiversity collapse in the North Sea. Further, North Sea dinoflagellate biomass remained low because of warming. Our results, therefore, reveal that regional climate warming and changes in oceanic circulation strongly influenced shifts in dinoflagellate biomass and biodiversity.
(© 2024 The Authors. Global Change Biology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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