Open Access Repository

Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic

Downloads

Downloads per month over past year

Veytia, D, Bestley, S ORCID: 0000-0001-9342-669X, Kawaguchi, S, Meiners, KM, Murphy, EJ, Fraser, AD ORCID: 0000-0003-1924-0015, Kusahara, K, Kimura, N and Corney, S ORCID: 0000-0002-8293-0863 2021 , 'Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic' , Ecological Indicators, vol. 129 , pp. 1-14 , doi: 10.1016/j.ecolind.2021.107934.

[img]
Preview
PDF
145186 - Overwi...pdf | Download (5MB)

| Preview

Abstract

Climate change alters the extent and structure of sea-ice environments, which affects how they function as a habitat for polar species. Identifying sea-ice characteristics that serve as indicators of habitat quality will be crucial to the monitoring and management of climate change impacts. In the Southern Ocean, Antarctic krill is a key prey species and fishery target. Krill larvae depend upon sea-ice habitats to survive the winter and recruit to the population in spring. Existing observations of sea-ice characteristics lack sufficient spatiotemporal coverage to quantify which ones contribute to favourable overwintering habitat, leading to uncertainties in how current and future changes in sea ice affect krill populations. Here, we derive regional-scale indices of annual krill recruitment spanning 35 years across the southwest Atlantic. To develop meaningful indicators of sea-ice habitat, we selected variables from a high-resolution sea-ice model that are hypothesized as relevant for larval habitat use. The resulting correlations between recruitment and sea-ice indicators vary by region and show remote connections to sea ice that correspond with established theories of larval transport. Through an improved representation of sea-ice habitat quality, as compared with using more traditional satellite-derived variables such as sea-ice extent and duration, we highlight plausible regions of overwintering habitat. Our findings improve current understanding of how krill are likely responding to changing sea ice and support emerging views that larval habitat use is complex. Furthermore, regional variation in larval dependence on sea ice may provide pockets of resilience to change for the broader krill population.

Item Type: Article
Authors/Creators:Veytia, D and Bestley, S and Kawaguchi, S and Meiners, KM and Murphy, EJ and Fraser, AD and Kusahara, K and Kimura, N and Corney, S
Keywords: climate change, Antarctic krill, sea ice, recruitment, Euphausia superba, overwinter survival
Journal or Publication Title: Ecological Indicators
Publisher: Elsevier Science Bv
ISSN: 1470-160X
DOI / ID Number: 10.1016/j.ecolind.2021.107934
Copyright Information:

Copyright © 2021 Published by Elsevier Ltd. This is an open access article under the Open Government License (OGL) https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/

Related URLs:
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP