Habitat-mediated dive behavior in free-ranging grey seals.

Understanding the links between foraging behaviour and habitat use of key species is essential to addressing fundamental questions about trophic interactions and ecosystem functioning. Eight female grey seals (Halichoerus grypus) were equipped with time-depth recorders linked to Fastloc GPS tags fol...

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Autores principales:	Mark Jessopp, Michelle Cronin, Tom Hart
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a808d5894ec448f9a5cf7c2a4e4103a1
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id	oai:doaj.org-article:a808d5894ec448f9a5cf7c2a4e4103a1
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spelling	oai:doaj.org-article:a808d5894ec448f9a5cf7c2a4e4103a12021-11-18T07:46:27ZHabitat-mediated dive behavior in free-ranging grey seals.1932-620310.1371/journal.pone.0063720https://doaj.org/article/a808d5894ec448f9a5cf7c2a4e4103a12013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23667663/?tool=EBIhttps://doaj.org/toc/1932-6203Understanding the links between foraging behaviour and habitat use of key species is essential to addressing fundamental questions about trophic interactions and ecosystem functioning. Eight female grey seals (Halichoerus grypus) were equipped with time-depth recorders linked to Fastloc GPS tags following the annual moult in southwest Ireland. Individual dives were coupled with environmental correlates to investigate the habitat use and dive behaviour of free-ranging seals. Dives were characterised as either pelagic, benthic, or shallow (where errors in location and charted water depth made differentiating between pelagic and benthic dives unreliable). Sixty-nine percent of dives occurring in water >50 m were benthic. Pelagic dives were more common at night than during the day. Seals performed more pelagic dives over fine sediments (mud/sand), and more benthic dives when foraging over more three-dimensionally complex rock substrates. We used Markov chain analysis to determine the probability of transiting between dive states. A low probability of repeat pelagic dives suggests that pelagic prey were encountered en route to the seabed. This approach could be applied to make more accurate predictions of habitat use in data-poor areas, and investigate contentious issues such as resource overlap and competition between top predators and fisheries, essential for the effective conservation of these key marine species.Mark JessoppMichelle CroninTom HartPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 5, p e63720 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mark Jessopp Michelle Cronin Tom Hart Habitat-mediated dive behavior in free-ranging grey seals.
description	Understanding the links between foraging behaviour and habitat use of key species is essential to addressing fundamental questions about trophic interactions and ecosystem functioning. Eight female grey seals (Halichoerus grypus) were equipped with time-depth recorders linked to Fastloc GPS tags following the annual moult in southwest Ireland. Individual dives were coupled with environmental correlates to investigate the habitat use and dive behaviour of free-ranging seals. Dives were characterised as either pelagic, benthic, or shallow (where errors in location and charted water depth made differentiating between pelagic and benthic dives unreliable). Sixty-nine percent of dives occurring in water >50 m were benthic. Pelagic dives were more common at night than during the day. Seals performed more pelagic dives over fine sediments (mud/sand), and more benthic dives when foraging over more three-dimensionally complex rock substrates. We used Markov chain analysis to determine the probability of transiting between dive states. A low probability of repeat pelagic dives suggests that pelagic prey were encountered en route to the seabed. This approach could be applied to make more accurate predictions of habitat use in data-poor areas, and investigate contentious issues such as resource overlap and competition between top predators and fisheries, essential for the effective conservation of these key marine species.
format	article
author	Mark Jessopp Michelle Cronin Tom Hart
author_facet	Mark Jessopp Michelle Cronin Tom Hart
author_sort	Mark Jessopp
title	Habitat-mediated dive behavior in free-ranging grey seals.
title_short	Habitat-mediated dive behavior in free-ranging grey seals.
title_full	Habitat-mediated dive behavior in free-ranging grey seals.
title_fullStr	Habitat-mediated dive behavior in free-ranging grey seals.
title_full_unstemmed	Habitat-mediated dive behavior in free-ranging grey seals.
title_sort	habitat-mediated dive behavior in free-ranging grey seals.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/a808d5894ec448f9a5cf7c2a4e4103a1
work_keys_str_mv	AT markjessopp habitatmediateddivebehaviorinfreeranginggreyseals AT michellecronin habitatmediateddivebehaviorinfreeranginggreyseals AT tomhart habitatmediateddivebehaviorinfreeranginggreyseals
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Habitat-mediated dive behavior in free-ranging grey seals.

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