Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic

The aim of this study was to test the hypotheses of faunistic mixing. Various different mechanisms of the mixture of zooplanktonic organisms may exist in the transition zones. The distribution of planktonic gastropods of the order Thecosomata, which show a high fidelity to the water masses, was anal...

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Detalles Bibliográficos
Autores principales:	Dadon, José Roberto, Masello, Juan Francisco
Publicado:	1999
Materias:	community structure hydrography mixing mollusc spatial distribution zooplankton Gastropoda
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v135_n1_p171_Dadon http://hdl.handle.net/20.500.12110/paper_00253162_v135_n1_p171_Dadon
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00253162_v135_n1_p171_Dadon
record_format	dspace
spelling	paper:paper_00253162_v135_n1_p171_Dadon2023-06-08T14:52:58Z Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic Dadon, José Roberto Masello, Juan Francisco community structure hydrography mixing mollusc spatial distribution zooplankton Gastropoda The aim of this study was to test the hypotheses of faunistic mixing. Various different mechanisms of the mixture of zooplanktonic organisms may exist in the transition zones. The distribution of planktonic gastropods of the order Thecosomata, which show a high fidelity to the water masses, was analysed. The study area comprises the southern part of the Brazil Current, the Brazil-Malvinas Confluence Zone, the Brazil Current Front, the Subtropical Front, the South Atlantic Current and the southern Benguela Current. The Subtropical Front presents sectors with contrasting dynamic characteristics which allow us to test hypotheses about the mechanisms generating faunistic mixture on a mesoscale. The evidence presented in the present study suggests that at least two mechanisms of faunistic mixture exist in the Subtropical Front. One is passive, resulting from environmental mixture in very dynamic front areas, where eddies are formed. The other mechanism occurs when the water column is vertically stratified. This mechanism depends on the migratory behaviour of the zooplankters and requires that there is stable stratification, that the depth of layers does not exceed the migratory capacity of the larger individuals and that the species can survive the physicochemical gradient. Fil:Dadon, J.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Masello, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v135_n1_p171_Dadon http://hdl.handle.net/20.500.12110/paper_00253162_v135_n1_p171_Dadon
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	community structure hydrography mixing mollusc spatial distribution zooplankton Gastropoda
spellingShingle	community structure hydrography mixing mollusc spatial distribution zooplankton Gastropoda Dadon, José Roberto Masello, Juan Francisco Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic
topic_facet	community structure hydrography mixing mollusc spatial distribution zooplankton Gastropoda
description	The aim of this study was to test the hypotheses of faunistic mixing. Various different mechanisms of the mixture of zooplanktonic organisms may exist in the transition zones. The distribution of planktonic gastropods of the order Thecosomata, which show a high fidelity to the water masses, was analysed. The study area comprises the southern part of the Brazil Current, the Brazil-Malvinas Confluence Zone, the Brazil Current Front, the Subtropical Front, the South Atlantic Current and the southern Benguela Current. The Subtropical Front presents sectors with contrasting dynamic characteristics which allow us to test hypotheses about the mechanisms generating faunistic mixture on a mesoscale. The evidence presented in the present study suggests that at least two mechanisms of faunistic mixture exist in the Subtropical Front. One is passive, resulting from environmental mixture in very dynamic front areas, where eddies are formed. The other mechanism occurs when the water column is vertically stratified. This mechanism depends on the migratory behaviour of the zooplankters and requires that there is stable stratification, that the depth of layers does not exceed the migratory capacity of the larger individuals and that the species can survive the physicochemical gradient.
author	Dadon, José Roberto Masello, Juan Francisco
author_facet	Dadon, José Roberto Masello, Juan Francisco
author_sort	Dadon, José Roberto
title	Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic
title_short	Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic
title_full	Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic
title_fullStr	Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic
title_full_unstemmed	Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic
title_sort	mechanisms generating and maintaining the admixture of zooplanktonic molluscs (euthecosomata: opistobranchiata: gastropoda) in the subtropical front of the south atlantic
publishDate	1999
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v135_n1_p171_Dadon http://hdl.handle.net/20.500.12110/paper_00253162_v135_n1_p171_Dadon
work_keys_str_mv	AT dadonjoseroberto mechanismsgeneratingandmaintainingtheadmixtureofzooplanktonicmolluscseuthecosomataopistobranchiatagastropodainthesubtropicalfrontofthesouthatlantic AT masellojuanfrancisco mechanismsgeneratingandmaintainingtheadmixtureofzooplanktonicmolluscseuthecosomataopistobranchiatagastropodainthesubtropicalfrontofthesouthatlantic
_version_	1768545865641754624

Mechanisms generating and maintaining the admixture of zooplanktonic molluscs (Euthecosomata: Opistobranchiata: Gastropoda) in the Subtropical Front of the South Atlantic

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