Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)

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Salps and chaetognaths constitute an important fraction of the macrozooplankton and have a prominent role in the marine food web. In our study, we analyzed the species composition, density, and biomass in an area of the southern Atlantic Ocean during the austral winters of 1999, 2000, and 2001. The...

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Autores principales: Daponte, M.C., Calcagno, J.A., Acevedo-Luque, M.J.J., Martos, P., Machinandiarena, L., Esnal, G.B.
Formato: JOUR
Materias:
aquatic organism
biomass
community composition
estimation method
food web
invertebrate
marine environment
population density
species diversity
zooplankton
Atlantic Ocean
Atlantic Ocean (Southeast)
Chaetognatha
Copepoda
Iasis zonaria
Ihlea
Parasagitta
Salpida
Salpidae
Serratosagitta tasmanica
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00074977_v87_n3_p437_Daponte
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00074977_v87_n3_p437_Daponte
record_format dspace
spelling todo:paper_00074977_v87_n3_p437_Daponte2023-10-03T14:05:49Z Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S) Daponte, M.C. Calcagno, J.A. Acevedo-Luque, M.J.J. Martos, P. Machinandiarena, L. Esnal, G.B. aquatic organism biomass community composition estimation method food web invertebrate marine environment population density species diversity zooplankton Atlantic Ocean Atlantic Ocean (Southeast) Chaetognatha Copepoda Iasis zonaria Ihlea Parasagitta Salpida Salpidae Serratosagitta tasmanica Salps and chaetognaths constitute an important fraction of the macrozooplankton and have a prominent role in the marine food web. In our study, we analyzed the species composition, density, and biomass in an area of the southern Atlantic Ocean during the austral winters of 1999, 2000, and 2001. The most abundant and frequent species were the salpids Ihlea magalhanica (Apstein, 1894) and Iasis zonaria (Pallas, 1774), and the chaetognaths Parasagitta friderici (Ritter-Zahony, 1911) and Serratosagitta tasmanica (Thomson, 1947). Chaetognaths were found in over 80% of the stations throughout the three winters, reaching up to 67 individuals (ind) m -3. Salps were found surviving at low population densities in 2000 and 2001, but in 1999, there were mass occurrences of I. zonaria and I. magalhanica, reaching densities of 301 and 123 ind m -3, respectively. To estimate biomass in C units, the relationship between dry weight and size was calculated for S. tasmanica and for solitaries and aggregates of I. zonaria and I, magalhanica. The biomass of salps and chaetognaths (as mg C m -3) over the shelf during the three consecutive winters was strongly related to prevailing physical and biological conditions. In 1999, the greatest contribution to macrozooplankton biomass corresponded to salps, while in 2000 and 2001, chaetognaths dominated the biomass. In swarm conditions, like in 1999, I. zonaria and I. magalhanica widely dominated over copepods and chaetognaths, producing an increase in the quantity of available C of up to 60 times in relation to the periods with very low population densities. © 2011 Rosenstiel School of Marine and Atmospheric Science. Fil:Daponte, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calcagno, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Acevedo-Luque, M.J.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martos, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Esnal, G.B. 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_00074977_v87_n3_p437_Daponte
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic aquatic organism
biomass
community composition
estimation method
food web
invertebrate
marine environment
population density
species diversity
zooplankton
Atlantic Ocean
Atlantic Ocean (Southeast)
Chaetognatha
Copepoda
Iasis zonaria
Ihlea
Parasagitta
Salpida
Salpidae
Serratosagitta tasmanica
spellingShingle aquatic organism
biomass
community composition
estimation method
food web
invertebrate
marine environment
population density
species diversity
zooplankton
Atlantic Ocean
Atlantic Ocean (Southeast)
Chaetognatha
Copepoda
Iasis zonaria
Ihlea
Parasagitta
Salpida
Salpidae
Serratosagitta tasmanica
Daponte, M.C.
Calcagno, J.A.
Acevedo-Luque, M.J.J.
Martos, P.
Machinandiarena, L.
Esnal, G.B.
Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)
topic_facet aquatic organism
biomass
community composition
estimation method
food web
invertebrate
marine environment
population density
species diversity
zooplankton
Atlantic Ocean
Atlantic Ocean (Southeast)
Chaetognatha
Copepoda
Iasis zonaria
Ihlea
Parasagitta
Salpida
Salpidae
Serratosagitta tasmanica
description Salps and chaetognaths constitute an important fraction of the macrozooplankton and have a prominent role in the marine food web. In our study, we analyzed the species composition, density, and biomass in an area of the southern Atlantic Ocean during the austral winters of 1999, 2000, and 2001. The most abundant and frequent species were the salpids Ihlea magalhanica (Apstein, 1894) and Iasis zonaria (Pallas, 1774), and the chaetognaths Parasagitta friderici (Ritter-Zahony, 1911) and Serratosagitta tasmanica (Thomson, 1947). Chaetognaths were found in over 80% of the stations throughout the three winters, reaching up to 67 individuals (ind) m -3. Salps were found surviving at low population densities in 2000 and 2001, but in 1999, there were mass occurrences of I. zonaria and I. magalhanica, reaching densities of 301 and 123 ind m -3, respectively. To estimate biomass in C units, the relationship between dry weight and size was calculated for S. tasmanica and for solitaries and aggregates of I. zonaria and I, magalhanica. The biomass of salps and chaetognaths (as mg C m -3) over the shelf during the three consecutive winters was strongly related to prevailing physical and biological conditions. In 1999, the greatest contribution to macrozooplankton biomass corresponded to salps, while in 2000 and 2001, chaetognaths dominated the biomass. In swarm conditions, like in 1999, I. zonaria and I. magalhanica widely dominated over copepods and chaetognaths, producing an increase in the quantity of available C of up to 60 times in relation to the periods with very low population densities. © 2011 Rosenstiel School of Marine and Atmospheric Science.
format JOUR
author Daponte, M.C.
Calcagno, J.A.
Acevedo-Luque, M.J.J.
Martos, P.
Machinandiarena, L.
Esnal, G.B.
author_facet Daponte, M.C.
Calcagno, J.A.
Acevedo-Luque, M.J.J.
Martos, P.
Machinandiarena, L.
Esnal, G.B.
author_sort Daponte, M.C.
title Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)
title_short Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)
title_full Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)
title_fullStr Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)
title_full_unstemmed Composition, density, and biomass of salpidae and chaetognatha in the southwestern Atlantic Ocean (34.5°S-39°S)
title_sort composition, density, and biomass of salpidae and chaetognatha in the southwestern atlantic ocean (34.5°s-39°s)
url http://hdl.handle.net/20.500.12110/paper_00074977_v87_n3_p437_Daponte
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AT acevedoluquemjj compositiondensityandbiomassofsalpidaeandchaetognathainthesouthwesternatlanticocean345s39s
AT martosp compositiondensityandbiomassofsalpidaeandchaetognathainthesouthwesternatlanticocean345s39s
AT machinandiarenal compositiondensityandbiomassofsalpidaeandchaetognathainthesouthwesternatlanticocean345s39s
AT esnalgb compositiondensityandbiomassofsalpidaeandchaetognathainthesouthwesternatlanticocean345s39s
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