Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica

Several biomass size spectra of benthic assemblages were constructed along a water depth gradient on the southern coast of Livingston Island (South Shetland Islands, Antarctica). The size-spectrum for shallow bottoms (<100 m depth) was bimodal with peaks in the 32-64 and 512-1024 g weight-classes...

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Autores: Saiz-Salinas, José Ignacio, Ramos, Ana
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1999
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::c79e265eb7d3474adfd1e152a4b9fce6
Acceso en línea:http://hdl.handle.net/10261/328065
Access Level:acceso abierto
Palabra clave:Centro Oceanográfico de Vigo
Biomass size spectra
Pesquerías
Benthic macrofauna
Total production
Antarctica
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spelling Biomass size-spectra of macrobenthic assemblages along water depth in AntarcticaSaiz-Salinas, José IgnacioRamos, AnaCentro Oceanográfico de VigoBiomass size spectraPesqueríasBenthic macrofaunaTotal productionAntarcticaSeveral biomass size spectra of benthic assemblages were constructed along a water depth gradient on the southern coast of Livingston Island (South Shetland Islands, Antarctica). The size-spectrum for shallow bottoms (<100 m depth) was bimodal with peaks in the 32-64 and 512-1024 g weight-classes, a feature which was attributable to the existence of large filter-feeders. By contrast, both intermediate (100-200 m) and deep (>200 m) zones showed unimodal spectra with biomass peaks in the 1-2 and 0.5-1 g weight ranges respectively. Filter-feeders also affected the larger size classes at intermediate depths, whereas they were almost absent in deeper waters. The slope of the normalized size-spectrum at shallower bottoms (-0.76) was different from those of intermediate (-1.25) and deeper (-1.31) zones. This clearly indicated 2 contrasting faunal strategies: a biomass increase with size in shallow waters, whereas the biomass decreased with size in deep waters. Estimates of total secondary production were calculated using allometric equations published in the literature. Results indicated a decrease of total secondary production along water depth, with 15 g C m-2 yr-1 in shallow waters, 9 g C m-2 yr-1 at intermediate bottoms and 8 g C m-2 yr-1 at deep bottoms. The pattern of the biomass size spectrum for shallower waters suggested that there was a predictable and regular supply of food, which allowed accumulation of biomass in the larger size classes corresponding to filter-feeder organisms. Conversely, the concentration of biomass in smaller size classes of the spectra for intermediate and deeper waters pointed to more unpredictable and fluctuating food conditions arriving from the overlying layer to the deeper sea floor. Sufficient evidence exists in the literature to indicate that a tight pelagic-benthic coupling was causing biological enhancement of a suspension-feeding macrofauna at shallow bottoms, and that below 100 m depth the effects of the coupling were rather weak.SI202320231999info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/328065reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésCentro Oceanográfico de Vigohttp://www.int-res.com/abstracts/meps/v178/p221-227/info:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::c79e265eb7d3474adfd1e152a4b9fce62026-05-22T06:33:51Z
dc.title.none.fl_str_mv Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
title Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
spellingShingle Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
Saiz-Salinas, José Ignacio
Centro Oceanográfico de Vigo
Biomass size spectra
Pesquerías
Benthic macrofauna
Total production
Antarctica
title_short Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
title_full Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
title_fullStr Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
title_full_unstemmed Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
title_sort Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica
dc.creator.none.fl_str_mv Saiz-Salinas, José Ignacio
Ramos, Ana
author Saiz-Salinas, José Ignacio
author_facet Saiz-Salinas, José Ignacio
Ramos, Ana
author_role author
author2 Ramos, Ana
author2_role author
dc.subject.none.fl_str_mv Centro Oceanográfico de Vigo
Biomass size spectra
Pesquerías
Benthic macrofauna
Total production
Antarctica
topic Centro Oceanográfico de Vigo
Biomass size spectra
Pesquerías
Benthic macrofauna
Total production
Antarctica
description Several biomass size spectra of benthic assemblages were constructed along a water depth gradient on the southern coast of Livingston Island (South Shetland Islands, Antarctica). The size-spectrum for shallow bottoms (<100 m depth) was bimodal with peaks in the 32-64 and 512-1024 g weight-classes, a feature which was attributable to the existence of large filter-feeders. By contrast, both intermediate (100-200 m) and deep (>200 m) zones showed unimodal spectra with biomass peaks in the 1-2 and 0.5-1 g weight ranges respectively. Filter-feeders also affected the larger size classes at intermediate depths, whereas they were almost absent in deeper waters. The slope of the normalized size-spectrum at shallower bottoms (-0.76) was different from those of intermediate (-1.25) and deeper (-1.31) zones. This clearly indicated 2 contrasting faunal strategies: a biomass increase with size in shallow waters, whereas the biomass decreased with size in deep waters. Estimates of total secondary production were calculated using allometric equations published in the literature. Results indicated a decrease of total secondary production along water depth, with 15 g C m-2 yr-1 in shallow waters, 9 g C m-2 yr-1 at intermediate bottoms and 8 g C m-2 yr-1 at deep bottoms. The pattern of the biomass size spectrum for shallower waters suggested that there was a predictable and regular supply of food, which allowed accumulation of biomass in the larger size classes corresponding to filter-feeder organisms. Conversely, the concentration of biomass in smaller size classes of the spectra for intermediate and deeper waters pointed to more unpredictable and fluctuating food conditions arriving from the overlying layer to the deeper sea floor. Sufficient evidence exists in the literature to indicate that a tight pelagic-benthic coupling was causing biological enhancement of a suspension-feeding macrofauna at shallow bottoms, and that below 100 m depth the effects of the coupling were rather weak.
publishDate 1999
dc.date.none.fl_str_mv 1999
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/328065
url http://hdl.handle.net/10261/328065
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Centro Oceanográfico de Vigo
http://www.int-res.com/abstracts/meps/v178/p221-227/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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