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Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic

Recent studies on deep-sea sponges have focused on mapping contemporary distributions while little work has been done to map historical distributions; historical distributions can provide valuable information on the time frame over which species have co-evolved and may provide insight into the reaso...

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Autores principales: Murillo, F. J., Kenchington, E., Lawson, J. M., Li, G., Piper, D. J. W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4771817/
https://www.ncbi.nlm.nih.gov/pubmed/27065495
http://dx.doi.org/10.1007/s00227-016-2839-5
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author Murillo, F. J.
Kenchington, E.
Lawson, J. M.
Li, G.
Piper, D. J. W.
author_facet Murillo, F. J.
Kenchington, E.
Lawson, J. M.
Li, G.
Piper, D. J. W.
author_sort Murillo, F. J.
collection PubMed
description Recent studies on deep-sea sponges have focused on mapping contemporary distributions while little work has been done to map historical distributions; historical distributions can provide valuable information on the time frame over which species have co-evolved and may provide insight into the reasons for their persistence or decline. Members of the sponge family Geodiidae are dominant members of deep-sea sponge assemblages in the northwestern Atlantic. They possess unique spicules called sterrasters, which undergo little transport in sediment and can therefore indicate the Geodiidae sponge historical presence when found in sediment cores. This study focuses on the slopes of Flemish Cap and Grand Bank, important fishing grounds off the coast of Newfoundland, Canada, in international waters. Sediment cores collected in 2009 and 2010 were visually inspected for sponge spicules. Cores containing spicules were sub-sampled and examined under a light microscope for the presence of sterrasters. These cores were also dated using X-radiographs and grouped into five time categories based on known sediment horizons, ranging from 17,000 years BP to the present. Chronological groupings identified Geodiidae sponges in four persistent sponge grounds. The oldest sterrasters were concentrated in the eastern region of the Flemish Cap and on the southeastern slope of the Grand Bank. Opportunistic sampling of a long core in the southeastern region of the Flemish Cap showed the continuous presence of sponge spicules to more than 130 ka BP. Our results indicate that the geodiids underwent a significant range expansion following deglaciation, and support a contemporary distribution that is not shaped by recent fishing activity.
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spelling pubmed-47718172016-04-06 Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic Murillo, F. J. Kenchington, E. Lawson, J. M. Li, G. Piper, D. J. W. Mar Biol Original Paper Recent studies on deep-sea sponges have focused on mapping contemporary distributions while little work has been done to map historical distributions; historical distributions can provide valuable information on the time frame over which species have co-evolved and may provide insight into the reasons for their persistence or decline. Members of the sponge family Geodiidae are dominant members of deep-sea sponge assemblages in the northwestern Atlantic. They possess unique spicules called sterrasters, which undergo little transport in sediment and can therefore indicate the Geodiidae sponge historical presence when found in sediment cores. This study focuses on the slopes of Flemish Cap and Grand Bank, important fishing grounds off the coast of Newfoundland, Canada, in international waters. Sediment cores collected in 2009 and 2010 were visually inspected for sponge spicules. Cores containing spicules were sub-sampled and examined under a light microscope for the presence of sterrasters. These cores were also dated using X-radiographs and grouped into five time categories based on known sediment horizons, ranging from 17,000 years BP to the present. Chronological groupings identified Geodiidae sponges in four persistent sponge grounds. The oldest sterrasters were concentrated in the eastern region of the Flemish Cap and on the southeastern slope of the Grand Bank. Opportunistic sampling of a long core in the southeastern region of the Flemish Cap showed the continuous presence of sponge spicules to more than 130 ka BP. Our results indicate that the geodiids underwent a significant range expansion following deglaciation, and support a contemporary distribution that is not shaped by recent fishing activity. Springer Berlin Heidelberg 2016-02-29 2016 /pmc/articles/PMC4771817/ /pubmed/27065495 http://dx.doi.org/10.1007/s00227-016-2839-5 Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Original Paper
Murillo, F. J.
Kenchington, E.
Lawson, J. M.
Li, G.
Piper, D. J. W.
Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
title Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
title_full Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
title_fullStr Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
title_full_unstemmed Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
title_short Ancient deep-sea sponge grounds on the Flemish Cap and Grand Bank, northwest Atlantic
title_sort ancient deep-sea sponge grounds on the flemish cap and grand bank, northwest atlantic
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4771817/
https://www.ncbi.nlm.nih.gov/pubmed/27065495
http://dx.doi.org/10.1007/s00227-016-2839-5
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