A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.

Changes in ocean ventilation driven by climate change result in loss of oxygen in the open ocean that, in turn, affects coastal areas in upwelling zones such as the northeast Pacific. Saanich Inlet, on the west coast of Canada, is a natural seasonally hypoxic fjord where certain continental shelf sp...

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Autores principales:	Marjolaine Matabos, Verena Tunnicliffe, S Kim Juniper, Courtney Dean
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/72ac0e8b05eb41ec97ba9f012a8df29a
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spelling	oai:doaj.org-article:72ac0e8b05eb41ec97ba9f012a8df29a2021-11-18T07:04:52ZA year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.1932-620310.1371/journal.pone.0045626https://doaj.org/article/72ac0e8b05eb41ec97ba9f012a8df29a2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23029145/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Changes in ocean ventilation driven by climate change result in loss of oxygen in the open ocean that, in turn, affects coastal areas in upwelling zones such as the northeast Pacific. Saanich Inlet, on the west coast of Canada, is a natural seasonally hypoxic fjord where certain continental shelf species occur in extreme hypoxia. One study site on the VENUS cabled subsea network is located in the hypoxic zone at 104 m depth. Photographs of the same 5 m(2) area were taken with a remotely-controlled still camera every 2/3 days between October 6(th) 2009 and October 18(th) 2010 and examined for community composition, species behaviour and microbial mat features. Instruments located on a near-by platform provided high-resolution measurements of environmental variables. We applied multivariate ordination methods and a principal coordinate analysis of neighbour matrices to determine temporal structures in our dataset. Responses to seasonal hypoxia (0.1-1.27 ml/l) and its high variability on short time-scale (hours) varied among species, and their life stages. During extreme hypoxia, microbial mats developed then disappeared as a hippolytid shrimp, Spirontocaris sica, appeared in high densities (200 m(-2)) despite oxygen below 0.2 ml/l. The slender sole Lyopsetta exilis was abundant in severe hypoxia and diminished as oxygen increased in the summer. This planktivore may be responding to changes in the depth of the diurnal migration of zooplankton. While the squat lobster Munida quadrispina was common at all times, juveniles disappeared in fluctuating conditions. Despite low oxygen conditions, animal densities were high indicating that the risk from hypoxia is balanced by factors such as food availability and escape from less tolerant predators. As hypoxia increases on the continental shelf, we expect benthic communities to become dominated by low diversity, hypoxia-tolerant species of low commercial significance.Marjolaine MatabosVerena TunnicliffeS Kim JuniperCourtney DeanPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 9, p e45626 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marjolaine Matabos Verena Tunnicliffe S Kim Juniper Courtney Dean A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
description	Changes in ocean ventilation driven by climate change result in loss of oxygen in the open ocean that, in turn, affects coastal areas in upwelling zones such as the northeast Pacific. Saanich Inlet, on the west coast of Canada, is a natural seasonally hypoxic fjord where certain continental shelf species occur in extreme hypoxia. One study site on the VENUS cabled subsea network is located in the hypoxic zone at 104 m depth. Photographs of the same 5 m(2) area were taken with a remotely-controlled still camera every 2/3 days between October 6(th) 2009 and October 18(th) 2010 and examined for community composition, species behaviour and microbial mat features. Instruments located on a near-by platform provided high-resolution measurements of environmental variables. We applied multivariate ordination methods and a principal coordinate analysis of neighbour matrices to determine temporal structures in our dataset. Responses to seasonal hypoxia (0.1-1.27 ml/l) and its high variability on short time-scale (hours) varied among species, and their life stages. During extreme hypoxia, microbial mats developed then disappeared as a hippolytid shrimp, Spirontocaris sica, appeared in high densities (200 m(-2)) despite oxygen below 0.2 ml/l. The slender sole Lyopsetta exilis was abundant in severe hypoxia and diminished as oxygen increased in the summer. This planktivore may be responding to changes in the depth of the diurnal migration of zooplankton. While the squat lobster Munida quadrispina was common at all times, juveniles disappeared in fluctuating conditions. Despite low oxygen conditions, animal densities were high indicating that the risk from hypoxia is balanced by factors such as food availability and escape from less tolerant predators. As hypoxia increases on the continental shelf, we expect benthic communities to become dominated by low diversity, hypoxia-tolerant species of low commercial significance.
format	article
author	Marjolaine Matabos Verena Tunnicliffe S Kim Juniper Courtney Dean
author_facet	Marjolaine Matabos Verena Tunnicliffe S Kim Juniper Courtney Dean
author_sort	Marjolaine Matabos
title	A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
title_short	A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
title_full	A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
title_fullStr	A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
title_full_unstemmed	A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
title_sort	year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/72ac0e8b05eb41ec97ba9f012a8df29a
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A year in hypoxia: epibenthic community responses to severe oxygen deficit at a subsea observatory in a coastal inlet.

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