Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)

The salp Iasis zonaria is often found over the Argentine continental shelf of the southwestern Atlantic Ocean and, occasionally, its high densities dominate over other groups of zooplankton. Therefore, a better understanding of the basic aspects of its life history is essential for understanding the...

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Autores principales: Daponte, M.C., Palmieri, M.A., Casareto, B.E., Esnal, G.B.
Formato: JOUR
Materias:
population structure
salp reproduction
salps
south Atlantic Ocean
zooplankton
continental shelf
invertebrate
life history trait
marine ecosystem
population density
population distribution
reproductive biology
winter
Atlantic Ocean
Atlantic Ocean (South)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01427873_v35_n4_p813_Daponte
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01427873_v35_n4_p813_Daponte2023-10-03T14:59:03Z Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001) Daponte, M.C. Palmieri, M.A. Casareto, B.E. Esnal, G.B. population structure salp reproduction salps south Atlantic Ocean zooplankton continental shelf invertebrate life history trait marine ecosystem population density population distribution population structure reproductive biology winter zooplankton Atlantic Ocean Atlantic Ocean (South) The salp Iasis zonaria is often found over the Argentine continental shelf of the southwestern Atlantic Ocean and, occasionally, its high densities dominate over other groups of zooplankton. Therefore, a better understanding of the basic aspects of its life history is essential for understanding the mechanisms underlying bloom formation. In this study, I. zonaria was collected during the austral winters of 1999, 2000 and 2001. Additional data were obtained from this area from May to November 1978. The most widespread distribution and largest catches occurred in 1999 (≈55 100 ind. 10 m-2). Densities decreased markedly in 2000 and the species was virtually absent in 2001. The growth of the solitary stage blastogenetic stolon and formation of several blocks of aggregates buds are described. Eight development stages were characterized and it is estimated that each solitary can produce at least four blocks and a total of ≈ 420 aggregates. The average number of buds per block increases from the older (first formed) to the youngest. The total number of buds (y) was related to solitary length (x) as: y = 4.94 x-134.57. Four developmental stages were described for aggregate individuals. Based on monthly samples collected in 1978, the estimated lifespan of aggregate individuals varies between 11 and 14 months. © 2013 The Author. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01427873_v35_n4_p813_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 population structure
salp reproduction
salps
south Atlantic Ocean
zooplankton
continental shelf
invertebrate
life history trait
marine ecosystem
population density
population distribution
population structure
reproductive biology
winter
zooplankton
Atlantic Ocean
Atlantic Ocean (South)
spellingShingle population structure
salp reproduction
salps
south Atlantic Ocean
zooplankton
continental shelf
invertebrate
life history trait
marine ecosystem
population density
population distribution
population structure
reproductive biology
winter
zooplankton
Atlantic Ocean
Atlantic Ocean (South)
Daponte, M.C.
Palmieri, M.A.
Casareto, B.E.
Esnal, G.B.
Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)
topic_facet population structure
salp reproduction
salps
south Atlantic Ocean
zooplankton
continental shelf
invertebrate
life history trait
marine ecosystem
population density
population distribution
population structure
reproductive biology
winter
zooplankton
Atlantic Ocean
Atlantic Ocean (South)
description The salp Iasis zonaria is often found over the Argentine continental shelf of the southwestern Atlantic Ocean and, occasionally, its high densities dominate over other groups of zooplankton. Therefore, a better understanding of the basic aspects of its life history is essential for understanding the mechanisms underlying bloom formation. In this study, I. zonaria was collected during the austral winters of 1999, 2000 and 2001. Additional data were obtained from this area from May to November 1978. The most widespread distribution and largest catches occurred in 1999 (≈55 100 ind. 10 m-2). Densities decreased markedly in 2000 and the species was virtually absent in 2001. The growth of the solitary stage blastogenetic stolon and formation of several blocks of aggregates buds are described. Eight development stages were characterized and it is estimated that each solitary can produce at least four blocks and a total of ≈ 420 aggregates. The average number of buds per block increases from the older (first formed) to the youngest. The total number of buds (y) was related to solitary length (x) as: y = 4.94 x-134.57. Four developmental stages were described for aggregate individuals. Based on monthly samples collected in 1978, the estimated lifespan of aggregate individuals varies between 11 and 14 months. © 2013 The Author.
format JOUR
author Daponte, M.C.
Palmieri, M.A.
Casareto, B.E.
Esnal, G.B.
author_facet Daponte, M.C.
Palmieri, M.A.
Casareto, B.E.
Esnal, G.B.
author_sort Daponte, M.C.
title Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)
title_short Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)
title_full Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)
title_fullStr Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)
title_full_unstemmed Reproduction and population structure of the salp Iasis zonaria (Pallas, 1774) in the southwestern Atlantic Ocean (34°30′ to 39°30′S) during three successive winters (1999-2001)
title_sort reproduction and population structure of the salp iasis zonaria (pallas, 1774) in the southwestern atlantic ocean (34°30′ to 39°30′s) during three successive winters (1999-2001)
url http://hdl.handle.net/20.500.12110/paper_01427873_v35_n4_p813_Daponte
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AT palmierima reproductionandpopulationstructureofthesalpiasiszonariapallas1774inthesouthwesternatlanticocean3430to3930sduringthreesuccessivewinters19992001
AT casaretobe reproductionandpopulationstructureofthesalpiasiszonariapallas1774inthesouthwesternatlanticocean3430to3930sduringthreesuccessivewinters19992001
AT esnalgb reproductionandpopulationstructureofthesalpiasiszonariapallas1774inthesouthwesternatlanticocean3430to3930sduringthreesuccessivewinters19992001
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