Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic

Mostrar todas las versiones(3)

The distribution and abundance of gymnosome gastropods in the Argentine Sea and Brazil--Malvinas Confluence during 1978-1979 and 1988 were studied. The collections analyzed included 768 quantitative samples obtained between 48°W and the coast, and from 35°S to 55°S. Two species were found. Spongiobr...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Dadon, J.R., Chauvin, S.F.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 1998
Materias:
abundance
biogeography
mollusc
(Southwest)
Atlantic Ocean
Clio
Clione antarctica
Gastropoda
Limacina
Spongiobranchaea australis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02601230_v64_n3_p345_Dadon
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_02601230_v64_n3_p345_Dadon
record_format dspace
spelling paperaa:paper_02601230_v64_n3_p345_Dadon2023-06-12T16:47:08Z Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic J. Molluscan Stud. 1998;64(3):345-354 Dadon, J.R. Chauvin, S.F. abundance biogeography mollusc (Southwest) Atlantic Ocean Clio Clione antarctica Gastropoda Limacina Spongiobranchaea australis The distribution and abundance of gymnosome gastropods in the Argentine Sea and Brazil--Malvinas Confluence during 1978-1979 and 1988 were studied. The collections analyzed included 768 quantitative samples obtained between 48°W and the coast, and from 35°S to 55°S. Two species were found. Spongiobranchaea australis was the most frequent and abundant (up to 730 per 1000 m3); its presence in the area was associated with the core of the Malvinas Current. Clione antarctica was less abundant (maximum abundance: 230 per 1000 m3) and was also associated with the Malvinas Current. The geographic ranges of both species in the area are wider than previously described. Since the range of S. australis in the area extends far from the range of its prey Clio, it is not clear whether S. australis can feed on the thecosomatous pteropod Limacina (and not only on Clio, as described in the bibliography) or it starves in that area. During the 1978-1979 annual cycle, the abundance of both species followed neither the abundance patterns of their prey nor of the total zooplankton, and differed from each other. The residence time of swarms of both gymnosomes were shorter than one month. As a general pattern, the aggregates are rapidly transported northward by the Malvinas Current and also penetrate the outer shelf water, but they remain there only during a short period and cannot preclude the final expatriation. So, the abundance of gymnosomes in the area depends on passive migration more than intrinsic population factors. Fil:Dadon, J.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02601230_v64_n3_p345_Dadon
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic abundance
biogeography
mollusc
(Southwest)
Atlantic Ocean
Clio
Clione antarctica
Gastropoda
Limacina
Spongiobranchaea australis
spellingShingle abundance
biogeography
mollusc
(Southwest)
Atlantic Ocean
Clio
Clione antarctica
Gastropoda
Limacina
Spongiobranchaea australis
Dadon, J.R.
Chauvin, S.F.
Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic
topic_facet abundance
biogeography
mollusc
(Southwest)
Atlantic Ocean
Clio
Clione antarctica
Gastropoda
Limacina
Spongiobranchaea australis
description The distribution and abundance of gymnosome gastropods in the Argentine Sea and Brazil--Malvinas Confluence during 1978-1979 and 1988 were studied. The collections analyzed included 768 quantitative samples obtained between 48°W and the coast, and from 35°S to 55°S. Two species were found. Spongiobranchaea australis was the most frequent and abundant (up to 730 per 1000 m3); its presence in the area was associated with the core of the Malvinas Current. Clione antarctica was less abundant (maximum abundance: 230 per 1000 m3) and was also associated with the Malvinas Current. The geographic ranges of both species in the area are wider than previously described. Since the range of S. australis in the area extends far from the range of its prey Clio, it is not clear whether S. australis can feed on the thecosomatous pteropod Limacina (and not only on Clio, as described in the bibliography) or it starves in that area. During the 1978-1979 annual cycle, the abundance of both species followed neither the abundance patterns of their prey nor of the total zooplankton, and differed from each other. The residence time of swarms of both gymnosomes were shorter than one month. As a general pattern, the aggregates are rapidly transported northward by the Malvinas Current and also penetrate the outer shelf water, but they remain there only during a short period and cannot preclude the final expatriation. So, the abundance of gymnosomes in the area depends on passive migration more than intrinsic population factors.
format Artículo
Artículo
publishedVersion
author Dadon, J.R.
Chauvin, S.F.
author_facet Dadon, J.R.
Chauvin, S.F.
author_sort Dadon, J.R.
title Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic
title_short Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic
title_full Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic
title_fullStr Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic
title_full_unstemmed Distribution and abundance of gymnosomata (Gastropoda: Opisthobranchia) in the Southwest Atlantic
title_sort distribution and abundance of gymnosomata (gastropoda: opisthobranchia) in the southwest atlantic
publishDate 1998
url http://hdl.handle.net/20.500.12110/paper_02601230_v64_n3_p345_Dadon
work_keys_str_mv AT dadonjr distributionandabundanceofgymnosomatagastropodaopisthobranchiainthesouthwestatlantic
AT chauvinsf distributionandabundanceofgymnosomatagastropodaopisthobranchiainthesouthwestatlantic
_version_ 1769810286500380672

Ejemplares similares