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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Centro Oceanográfico de Vigo
1999
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Online Access: | http://hdl.handle.net/10508/10033 https://doi.org/10.3354/meps178221 |
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ftieo:oai:repositorio.ieo.es:10508/10033 2023-05-15T13:41:24+02:00 Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica Saiz-Salinas, J.I. (José Ignacio) Ramos, A. (Ana) Antarctic Ocean Atlantic Ocean South Atlantic Southwest Atlantic 1999 http://hdl.handle.net/10508/10033 https://doi.org/10.3354/meps178221 eng eng Centro Oceanográfico de Vigo http://www.int-res.com/abstracts/meps/v178/p221-227/ 0171-8630 http://hdl.handle.net/10508/10033 Marine Ecology-Progress Series, 178. 1999: 221-227 doi:10.3354/meps178221 Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND Biomass size spectra Benthic macrofauna Total production Antarctica article 1999 ftieo https://doi.org/10.3354/meps178221 2022-07-26T23:48:52Z 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. Versión del editor 2,4830 Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Antarctica Livingston Island South Shetland Islands Instituto Español de Oceanografía: e-IEO Antarctic Antarctic Ocean Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) South Shetland Islands Marine Ecology Progress Series 178 221 227 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Biomass size spectra Benthic macrofauna Total production Antarctica |
spellingShingle |
Biomass size spectra Benthic macrofauna Total production Antarctica Saiz-Salinas, J.I. (José Ignacio) Ramos, A. (Ana) Biomass size-spectra of macrobenthic assemblages along water depth in Antarctica |
topic_facet |
Biomass size spectra 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. Versión del editor 2,4830 |
format |
Article in Journal/Newspaper |
author |
Saiz-Salinas, J.I. (José Ignacio) Ramos, A. (Ana) |
author_facet |
Saiz-Salinas, J.I. (José Ignacio) Ramos, A. (Ana) |
author_sort |
Saiz-Salinas, J.I. (José Ignacio) |
title |
Biomass size-spectra of macrobenthic assemblages along water depth in 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 |
publisher |
Centro Oceanográfico de Vigo |
publishDate |
1999 |
url |
http://hdl.handle.net/10508/10033 https://doi.org/10.3354/meps178221 |
op_coverage |
Antarctic Ocean Atlantic Ocean South Atlantic Southwest Atlantic |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) |
geographic |
Antarctic Antarctic Ocean Livingston Island South Shetland Islands |
geographic_facet |
Antarctic Antarctic Ocean Livingston Island South Shetland Islands |
genre |
Antarc* Antarctic Antarctic Ocean Antarctica Livingston Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctica Livingston Island South Shetland Islands |
op_relation |
http://www.int-res.com/abstracts/meps/v178/p221-227/ 0171-8630 http://hdl.handle.net/10508/10033 Marine Ecology-Progress Series, 178. 1999: 221-227 doi:10.3354/meps178221 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.3354/meps178221 |
container_title |
Marine Ecology Progress Series |
container_volume |
178 |
container_start_page |
221 |
op_container_end_page |
227 |
_version_ |
1766150460786343936 |