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Spatial and temporal shift in the factors affecting the population dynamics of Calanus copepods in the North Sea by José T. Montero; Mauricio Lima; Sergio A. Estay; Enrico L. Rezende is a Environmental Science article available to read on EtoBox.

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## Abstract The swap in abundance between two Calanus species in the North Sea during the 1980s constitutes a quintessential example of regime shift, with important ecosystemic and economic repercussions because these copepods constitute a major component of the diet of larval and juvenile cods. It is hypothesized that this transition was driven by gradual changes in primary productivity, the North Atlantic Oscillation (NAO) and sea surface temperatures (SST), and yet how these factors contribute to the population dynamics of these two species and the overall regime shift remains unclear. Here, we combine a highly resolved and spatially structured longitudinal dataset with population dynamics theory‐based models to obtain a thorough and more detailed description of populations’ responses to the regime shift observed in the North Sea. Our analyses highlight that this transition exhibits a clear spatial structure and involved a decoupling between the dynamics of Calanus finmarchicus and the NAO in western regions and between Calanus helgolandicus and SST in the eastern regions of the North Sea. Consequently, the observed switch in abundance between these species reflects the interact

Who reads Spatial and temporal shift in the factors affecting the population dynamics of Calanus copepods in the North Sea?

Author

José T. Montero; Mauricio Lima; Sergio A. Estay; Enrico L. Rezende

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; Research Square (ISSN 1354-1013)

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)