Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer

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Little attention has been paid to small copepods and other zooplankton inhabiting pelagic ecosystems of the Southwestern Atlantic Ocean under the influence of the Antarctic Circumpolar Current circulation, despite their important role in the trophic chain and fisheries. This study gives a synoptic v...

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Autores principales: Thompson, G.A., Dinofrio, E.O., Alder, V.A.
Formato: JOUR
Materias:
copepods
normalized biomass size spectra
size structure
Southwestern Atlantic
zooplankton
abundance
biomass
chlorophyll
community structure
crustacean
population density
population distribution
summer
trophic level
upper ocean
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01427873_v35_n3_p610_Thompson
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01427873_v35_n3_p610_Thompson
record_format dspace
spelling todo:paper_01427873_v35_n3_p610_Thompson2023-10-03T14:59:03Z Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer Thompson, G.A. Dinofrio, E.O. Alder, V.A. copepods normalized biomass size spectra size structure Southwestern Atlantic zooplankton abundance biomass chlorophyll community structure crustacean population density population distribution summer trophic level upper ocean zooplankton Atlantic Ocean Atlantic Ocean (Southwest) Brazil-Malvinas Confluence Little attention has been paid to small copepods and other zooplankton inhabiting pelagic ecosystems of the Southwestern Atlantic Ocean under the influence of the Antarctic Circumpolar Current circulation, despite their important role in the trophic chain and fisheries. This study gives a synoptic view (January 2001) of the micro and mesoplankton size fractions and normalized biomass size spectra (NBSS) in upper waters of five different ecological domains (shelf and oceanic Subantarctic and Antarctic waters) including the Brazil-Malvinas confluence (BMC). Copepods were always the main component of the zooplankton; the <300-μm fraction represented between 70 and 99% in terms of numbers and from 20 to 88% in terms of biomass. Other zooplankton contributed with <40% to total zooplankton densities, though showing some biomass peaks (>50%). Chlorophyll a, sea surface temperature and salinity were the environmental variables that best explained the distribution trend of zooplankton, mainly that of the <300-μm fraction. For all the domains, NBSS revealed flat slopes (-0.6 to-1), suggesting a higher proportion of large organisms than expected at equilibrium. A dome-shape feature was detected in the BMC. Total biomass and trophic levels of the system were related to the composition of the community and the hydrological conditions of the domains covered. © 2013 The Author. Fil:Thompson, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alder, V.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01427873_v35_n3_p610_Thompson
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic copepods
normalized biomass size spectra
size structure
Southwestern Atlantic
zooplankton
abundance
biomass
chlorophyll
community structure
crustacean
population density
population distribution
summer
trophic level
upper ocean
zooplankton
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
spellingShingle copepods
normalized biomass size spectra
size structure
Southwestern Atlantic
zooplankton
abundance
biomass
chlorophyll
community structure
crustacean
population density
population distribution
summer
trophic level
upper ocean
zooplankton
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
Thompson, G.A.
Dinofrio, E.O.
Alder, V.A.
Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer
topic_facet copepods
normalized biomass size spectra
size structure
Southwestern Atlantic
zooplankton
abundance
biomass
chlorophyll
community structure
crustacean
population density
population distribution
summer
trophic level
upper ocean
zooplankton
Atlantic Ocean
Atlantic Ocean (Southwest)
Brazil-Malvinas Confluence
description Little attention has been paid to small copepods and other zooplankton inhabiting pelagic ecosystems of the Southwestern Atlantic Ocean under the influence of the Antarctic Circumpolar Current circulation, despite their important role in the trophic chain and fisheries. This study gives a synoptic view (January 2001) of the micro and mesoplankton size fractions and normalized biomass size spectra (NBSS) in upper waters of five different ecological domains (shelf and oceanic Subantarctic and Antarctic waters) including the Brazil-Malvinas confluence (BMC). Copepods were always the main component of the zooplankton; the <300-μm fraction represented between 70 and 99% in terms of numbers and from 20 to 88% in terms of biomass. Other zooplankton contributed with <40% to total zooplankton densities, though showing some biomass peaks (>50%). Chlorophyll a, sea surface temperature and salinity were the environmental variables that best explained the distribution trend of zooplankton, mainly that of the <300-μm fraction. For all the domains, NBSS revealed flat slopes (-0.6 to-1), suggesting a higher proportion of large organisms than expected at equilibrium. A dome-shape feature was detected in the BMC. Total biomass and trophic levels of the system were related to the composition of the community and the hydrological conditions of the domains covered. © 2013 The Author.
format JOUR
author Thompson, G.A.
Dinofrio, E.O.
Alder, V.A.
author_facet Thompson, G.A.
Dinofrio, E.O.
Alder, V.A.
author_sort Thompson, G.A.
title Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer
title_short Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer
title_full Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer
title_fullStr Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer
title_full_unstemmed Structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the Southwestern Atlantic Ocean during summer
title_sort structure, abundance and biomass size spectra of copepods and other zooplankton communities in upper waters of the southwestern atlantic ocean during summer
url http://hdl.handle.net/20.500.12110/paper_01427873_v35_n3_p610_Thompson
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