Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer

The relative importance of small forms of copepods has been historically underestimated by the traditional use of 200-300-μm mesh nets. This work quantified the distribution and abundance of copepods, considering two size fractions (<300 μm and >300 μm), in superficial waters (9 m deep...

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Autores principales: Thompson, Gustavo Ariel, Alder, Viviana A.
Publicado: 2012
Materias:
Biomass
Copepods
Density
Drake Passage
Interannual fluctuations
abundance
annual variation
biomass
community composition
crustacean
dominance
sea surface temperature
summer
water mass
Southern Ocean
Copepoda
Cyclopoida
Oithona similis
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1438387X_v66_n2_p127_Thompson
http://hdl.handle.net/20.500.12110/paper_1438387X_v66_n2_p127_Thompson
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_1438387X_v66_n2_p127_Thompson
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spelling paper:paper_1438387X_v66_n2_p127_Thompson2023-06-08T16:15:53Z Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer Thompson, Gustavo Ariel Alder, Viviana A. Biomass Copepods Density Drake Passage Interannual fluctuations abundance annual variation biomass community composition crustacean dominance sea surface temperature summer water mass Drake Passage Southern Ocean Copepoda Cyclopoida Oithona similis The relative importance of small forms of copepods has been historically underestimated by the traditional use of 200-300-μm mesh nets. This work quantified the distribution and abundance of copepods, considering two size fractions (<300 μm and >300 μm), in superficial waters (9 m deep) of the Drake Passage and contributed to the knowledge of their interannual fluctuations among three summers. Four types of nauplii and eleven species of copepods at copepodite and adult stages were identified, with abundance values of up to 13 ind L -1 and 28,300 μg C m -3. The <300-μm fraction, composed of Oithona similis, small cyclopoids and nauplii, dominated the copepod communities in the 3 years; it accounted for more than 77% of the total number and for between 40 and 63% of the total biomass. Changes in density and biomass values among the three cruises differed according to copepod size fraction and water mass; the >300-μm fraction showed no changes among the 3 years, both in Antarctic (density and biomass) and in Subantarctic waters (density), whereas the <300-μm fraction showed higher (density and biomass) values in 2001 both in Subantarctic and in Antarctic waters. Sea surface temperature and its anomaly accounted for the largest proportion of variability in copepod density and biomass, particularly for the <300-μm fraction. © 2011 Springer-Verlag and AWI. 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1438387X_v66_n2_p127_Thompson http://hdl.handle.net/20.500.12110/paper_1438387X_v66_n2_p127_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 Biomass
Copepods
Density
Drake Passage
Interannual fluctuations
abundance
annual variation
biomass
community composition
crustacean
dominance
sea surface temperature
summer
water mass
Drake Passage
Southern Ocean
Copepoda
Cyclopoida
Oithona similis
spellingShingle Biomass
Copepods
Density
Drake Passage
Interannual fluctuations
abundance
annual variation
biomass
community composition
crustacean
dominance
sea surface temperature
summer
water mass
Drake Passage
Southern Ocean
Copepoda
Cyclopoida
Oithona similis
Thompson, Gustavo Ariel
Alder, Viviana A.
Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer
topic_facet Biomass
Copepods
Density
Drake Passage
Interannual fluctuations
abundance
annual variation
biomass
community composition
crustacean
dominance
sea surface temperature
summer
water mass
Drake Passage
Southern Ocean
Copepoda
Cyclopoida
Oithona similis
description The relative importance of small forms of copepods has been historically underestimated by the traditional use of 200-300-μm mesh nets. This work quantified the distribution and abundance of copepods, considering two size fractions (<300 μm and >300 μm), in superficial waters (9 m deep) of the Drake Passage and contributed to the knowledge of their interannual fluctuations among three summers. Four types of nauplii and eleven species of copepods at copepodite and adult stages were identified, with abundance values of up to 13 ind L -1 and 28,300 μg C m -3. The <300-μm fraction, composed of Oithona similis, small cyclopoids and nauplii, dominated the copepod communities in the 3 years; it accounted for more than 77% of the total number and for between 40 and 63% of the total biomass. Changes in density and biomass values among the three cruises differed according to copepod size fraction and water mass; the >300-μm fraction showed no changes among the 3 years, both in Antarctic (density and biomass) and in Subantarctic waters (density), whereas the <300-μm fraction showed higher (density and biomass) values in 2001 both in Subantarctic and in Antarctic waters. Sea surface temperature and its anomaly accounted for the largest proportion of variability in copepod density and biomass, particularly for the <300-μm fraction. © 2011 Springer-Verlag and AWI.
author Thompson, Gustavo Ariel
Alder, Viviana A.
author_facet Thompson, Gustavo Ariel
Alder, Viviana A.
author_sort Thompson, Gustavo Ariel
title Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer
title_short Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer
title_full Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer
title_fullStr Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer
title_full_unstemmed Interannual fluctuations in copepod abundance and contribution of small forms in the Drake Passage during austral summer
title_sort interannual fluctuations in copepod abundance and contribution of small forms in the drake passage during austral summer
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1438387X_v66_n2_p127_Thompson
http://hdl.handle.net/20.500.12110/paper_1438387X_v66_n2_p127_Thompson
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