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

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 S...

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Autores principales:	Devi Veytia, Sophie Bestley, So Kawaguchi, Klaus M. Meiners, Eugene J. Murphy, Alexander D. Fraser, Kazuya Kusahara, Noriaki Kimura, Stuart Corney
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Climate change Sea ice Antarctic krill Euphausia superba Overwinter survival Recruitment Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/c46f297c8cd14f2fab355e71029b9117
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spelling	oai:doaj.org-article:c46f297c8cd14f2fab355e71029b91172021-12-01T04:56:07ZOverwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic1470-160X10.1016/j.ecolind.2021.107934https://doaj.org/article/c46f297c8cd14f2fab355e71029b91172021-10-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21005999https://doaj.org/toc/1470-160XClimate 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.Devi VeytiaSophie BestleySo KawaguchiKlaus M. MeinersEugene J. MurphyAlexander D. FraserKazuya KusaharaNoriaki KimuraStuart CorneyElsevierarticleClimate changeSea iceAntarctic krillEuphausia superbaOverwinter survivalRecruitmentEcologyQH540-549.5ENEcological Indicators, Vol 129, Iss , Pp 107934- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Climate change Sea ice Antarctic krill Euphausia superba Overwinter survival Recruitment Ecology QH540-549.5
spellingShingle	Climate change Sea ice Antarctic krill Euphausia superba Overwinter survival Recruitment Ecology QH540-549.5 Devi Veytia Sophie Bestley So Kawaguchi Klaus M. Meiners Eugene J. Murphy Alexander D. Fraser Kazuya Kusahara Noriaki Kimura Stuart Corney Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
description	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.
format	article
author	Devi Veytia Sophie Bestley So Kawaguchi Klaus M. Meiners Eugene J. Murphy Alexander D. Fraser Kazuya Kusahara Noriaki Kimura Stuart Corney
author_facet	Devi Veytia Sophie Bestley So Kawaguchi Klaus M. Meiners Eugene J. Murphy Alexander D. Fraser Kazuya Kusahara Noriaki Kimura Stuart Corney
author_sort	Devi Veytia
title	Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
title_short	Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
title_full	Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
title_fullStr	Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
title_full_unstemmed	Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic
title_sort	overwinter sea-ice characteristics important for antarctic krill recruitment in the southwest atlantic
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/c46f297c8cd14f2fab355e71029b9117
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Overwinter sea-ice characteristics important for Antarctic krill recruitment in the southwest Atlantic

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