nerc.ac.uk

Modelling the biogeographic boundary shift of Calanus finmarchicus reveals drivers of Arctic Atlantification by subarctic zooplankton

Freer, Jennifer J. ORCID: https://orcid.org/0000-0002-3947-9261; Daase, Malin; Tarling, Geraint A. ORCID: https://orcid.org/0000-0002-3753-5899. 2022 Modelling the biogeographic boundary shift of Calanus finmarchicus reveals drivers of Arctic Atlantification by subarctic zooplankton. Global Change Biology, 28 (2). 429-440. https://doi.org/10.1111/gcb.15937

Before downloading, please read NORA policies.
[img]
Preview
Text (Open Access)
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2021 The Authors. Global Change Biology published by John Wiley & Sons Ltd.
gcb.15937.pdf - Published Version
Available under License Creative Commons Attribution 4.0.

Download (2MB) | Preview

Abstract/Summary

Biological communities in the Arctic are changing through the climate-driven encroachment of subarctic species. This ‘Atlantification’ extends to keystone Calanoid copepods, as the small-bodied Calanus finmarchicus increases in abundance in areas where it overlaps with larger Arctic congeners. The environmental factors that are facilitating this shift, whether related to optimal conditions in temperature or seasonality, remain unclear. Assessing these drivers at an Arctic-wide scale is necessary to predict future ecosystem change and impacts. Here we have compiled range-wide occurrences of C. finmarchicus and a suite of seasonal biophysical climatologies to build a boreo-Arctic ecological niche model. The dataset was divided into two eras, 1955-1984 and 1985-2017, and an optimised MaxEnt model was used to predict the seasonal distribution of the abiotic niche of C. finmarchicus in both eras. Comparing outputs between eras reveals an increase in habitat suitability at the Arctic range edge. Large and significant increases in suitability are predicted in regions of the Greenland, Labrador, and Southern Barents Seas that have experienced reduced sea-ice cover. With the exception of the Barents Sea, these areas also show a seasonal shift in the timing of peak habitat suitability towards an earlier season. Our findings suggest that the Atlantification of Arctic zooplankton communities is accompanied by climate-driven phenology changes. Although seasonality is a critical constraint to the establishment of C. finmarchicus at Arctic latitudes, earlier sea-ice retreat and associated productivity is making these environments increasingly favourable for this subarctic species.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1111/gcb.15937
ISSN: 1354-1013
Additional Keywords: zooplankton, subarctic, climate warming, species distributions, Atlantification
Date made live: 18 Oct 2021 12:05 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/529877

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...