Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin

Highly productive kelp beds off Nova Scotia, Canada export detrital material to adjacent sedimentary habitats in deeper waters. We evaluated the importance of this subsidy to sea urchins Strongylocentrotus droebachiensis in less productive habitats. Gonad index and gut content of urchins on sediment...

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Autores principales:	K Filbee-Dexter, RE Scheibling
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2014
Materias:	Biology (General) QH301-705.5 Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/b4cd2814193847daba8685aea6200ea2
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spelling	oai:doaj.org-article:b4cd2814193847daba8685aea6200ea22021-11-18T09:20:06ZDetrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin1864-77821864-779010.3354/ab00607https://doaj.org/article/b4cd2814193847daba8685aea6200ea22014-12-01T00:00:00Zhttps://www.int-res.com/abstracts/ab/v23/n1/p71-86/https://doaj.org/toc/1864-7782https://doaj.org/toc/1864-7790Highly productive kelp beds off Nova Scotia, Canada export detrital material to adjacent sedimentary habitats in deeper waters. We evaluated the importance of this subsidy to sea urchins Strongylocentrotus droebachiensis in less productive habitats. Gonad index and gut content of urchins on sediments at 60 m depth were measured monthly from September 2010 to May 2013 in a large semi-protected bay, and compared to concurrent measurements of sea urchins at 8 m depth off a nearby headland. Detrital algal cover in the bay was measured using a towed camera system. Seasonal patterns in algal deposition and gut contents of deep-living urchins indicated that detritus was the predominant food source from March to October. We observed lower gonad indices in deep-living sea urchins compared to those at 8 m, but deep-living urchins spawned outside of the main spring season, suggesting periodic detrital subsidy enhances their reproductive condition. Food availability and temperature appear to control the timing of gametogenesis, and phytodetritus may cue gamete release in these deep habitats. To evaluate the response of deep-living urchins to detrital subsidy, and turnover time of this material, we deployed lines baited with kelp thalli at 45 and 60 m depth and measured rates of encounter and consumption of kelp detritus by sea urchins, using the towed camera. Sea urchins aggregated on kelp within hours of deployment, and consumed it after 3 to 5 mo. Our findings suggest kelp detritus represents an important energy source that can support a high reproductive capacity in deep-living urchins.K Filbee-DexterRE ScheiblingInter-ResearcharticleBiology (General)QH301-705.5MicrobiologyQR1-502ENAquatic Biology, Vol 23, Iss 1, Pp 71-86 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5 Microbiology QR1-502
spellingShingle	Biology (General) QH301-705.5 Microbiology QR1-502 K Filbee-Dexter RE Scheibling Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
description	Highly productive kelp beds off Nova Scotia, Canada export detrital material to adjacent sedimentary habitats in deeper waters. We evaluated the importance of this subsidy to sea urchins Strongylocentrotus droebachiensis in less productive habitats. Gonad index and gut content of urchins on sediments at 60 m depth were measured monthly from September 2010 to May 2013 in a large semi-protected bay, and compared to concurrent measurements of sea urchins at 8 m depth off a nearby headland. Detrital algal cover in the bay was measured using a towed camera system. Seasonal patterns in algal deposition and gut contents of deep-living urchins indicated that detritus was the predominant food source from March to October. We observed lower gonad indices in deep-living sea urchins compared to those at 8 m, but deep-living urchins spawned outside of the main spring season, suggesting periodic detrital subsidy enhances their reproductive condition. Food availability and temperature appear to control the timing of gametogenesis, and phytodetritus may cue gamete release in these deep habitats. To evaluate the response of deep-living urchins to detrital subsidy, and turnover time of this material, we deployed lines baited with kelp thalli at 45 and 60 m depth and measured rates of encounter and consumption of kelp detritus by sea urchins, using the towed camera. Sea urchins aggregated on kelp within hours of deployment, and consumed it after 3 to 5 mo. Our findings suggest kelp detritus represents an important energy source that can support a high reproductive capacity in deep-living urchins.
format	article
author	K Filbee-Dexter RE Scheibling
author_facet	K Filbee-Dexter RE Scheibling
author_sort	K Filbee-Dexter
title	Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
title_short	Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
title_full	Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
title_fullStr	Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
title_full_unstemmed	Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
title_sort	detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin
publisher	Inter-Research
publishDate	2014
url	https://doaj.org/article/b4cd2814193847daba8685aea6200ea2
work_keys_str_mv	AT kfilbeedexter detritalkelpsubsidysupportshighreproductiveconditionofdeeplivingseaurchinsinasedimentarybasin AT rescheibling detritalkelpsubsidysupportshighreproductiveconditionofdeeplivingseaurchinsinasedimentarybasin
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Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin

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