Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina

Five exposed microtidal sandy beaches of North-eastern Buenos Aires (Argentina) were analysed to evaluate the influence of coastal dynamics on the abundance of the intertidal clams Donax hanleyanus and Mesodesma mactroides over a 1-year period. The physical characterisation of each beach was perform...

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Autores principales: Thompson, G.A., Sánchez De Bock, M.F.
Formato: JOUR
Materias:
Bivalves
Donax hanleyanus
Mesodesma mactroides
Morphodynamic index
Physical variables
Sandy beach
Wedge clam
Yellow clam
abundance
beach morphology
bivalve
morphodynamics
multivariate analysis
population density
population dynamics
temporal variation
Argentina
South America
Bivalvia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01739565_v30_n2_p198_Thompson
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_01739565_v30_n2_p198_Thompson
record_format dspace
spelling todo:paper_01739565_v30_n2_p198_Thompson2023-10-03T15:07:43Z Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina Thompson, G.A. Sánchez De Bock, M.F. Bivalves Donax hanleyanus Mesodesma mactroides Morphodynamic index Physical variables Sandy beach Wedge clam Yellow clam abundance beach morphology bivalve morphodynamics multivariate analysis population density population dynamics temporal variation Argentina South America Bivalvia Donax hanleyanus Mesodesma mactroides Five exposed microtidal sandy beaches of North-eastern Buenos Aires (Argentina) were analysed to evaluate the influence of coastal dynamics on the abundance of the intertidal clams Donax hanleyanus and Mesodesma mactroides over a 1-year period. The physical characterisation of each beach was performed using 15 environmental variables and six morphodynamic indices. The population densities of both clam species were estimated by the number of individuals per strip-transect. Analysis of similarities revealed a significant multivariate environmental difference among beaches, which could be aggregated into a northern and a southern group. The former group was characterised by an intermediate morphodynamic state and by having, in general, high density values for both clam species. The latter was composed of beaches with an intermediate reflective state and showed, in general, low density values. Beach Index and Area showed the lowest temporal variation. Total density values, as well as density values of recruits and adults of D. hanleyanus and M. mactroides did not follow a north-south latitudinal gradient. Spatial and temporal fluctuations of density values were best explained by changes in individual physical variables rather than by changes in composite indices. © 2009 Blackwell Verlag GmbH. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01739565_v30_n2_p198_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 Bivalves
Donax hanleyanus
Mesodesma mactroides
Morphodynamic index
Physical variables
Sandy beach
Wedge clam
Yellow clam
abundance
beach morphology
bivalve
morphodynamics
multivariate analysis
population density
population dynamics
temporal variation
Argentina
South America
Bivalvia
Donax hanleyanus
Mesodesma mactroides
spellingShingle Bivalves
Donax hanleyanus
Mesodesma mactroides
Morphodynamic index
Physical variables
Sandy beach
Wedge clam
Yellow clam
abundance
beach morphology
bivalve
morphodynamics
multivariate analysis
population density
population dynamics
temporal variation
Argentina
South America
Bivalvia
Donax hanleyanus
Mesodesma mactroides
Thompson, G.A.
Sánchez De Bock, M.F.
Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
topic_facet Bivalves
Donax hanleyanus
Mesodesma mactroides
Morphodynamic index
Physical variables
Sandy beach
Wedge clam
Yellow clam
abundance
beach morphology
bivalve
morphodynamics
multivariate analysis
population density
population dynamics
temporal variation
Argentina
South America
Bivalvia
Donax hanleyanus
Mesodesma mactroides
description Five exposed microtidal sandy beaches of North-eastern Buenos Aires (Argentina) were analysed to evaluate the influence of coastal dynamics on the abundance of the intertidal clams Donax hanleyanus and Mesodesma mactroides over a 1-year period. The physical characterisation of each beach was performed using 15 environmental variables and six morphodynamic indices. The population densities of both clam species were estimated by the number of individuals per strip-transect. Analysis of similarities revealed a significant multivariate environmental difference among beaches, which could be aggregated into a northern and a southern group. The former group was characterised by an intermediate morphodynamic state and by having, in general, high density values for both clam species. The latter was composed of beaches with an intermediate reflective state and showed, in general, low density values. Beach Index and Area showed the lowest temporal variation. Total density values, as well as density values of recruits and adults of D. hanleyanus and M. mactroides did not follow a north-south latitudinal gradient. Spatial and temporal fluctuations of density values were best explained by changes in individual physical variables rather than by changes in composite indices. © 2009 Blackwell Verlag GmbH.
format JOUR
author Thompson, G.A.
Sánchez De Bock, M.F.
author_facet Thompson, G.A.
Sánchez De Bock, M.F.
author_sort Thompson, G.A.
title Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
title_short Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
title_full Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
title_fullStr Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
title_full_unstemmed Influence of beach morphodynamics on the bivalve Donax hanleyanus and Mesodesma mactroides populations in Argentina
title_sort influence of beach morphodynamics on the bivalve donax hanleyanus and mesodesma mactroides populations in argentina
url http://hdl.handle.net/20.500.12110/paper_01739565_v30_n2_p198_Thompson
work_keys_str_mv AT thompsonga influenceofbeachmorphodynamicsonthebivalvedonaxhanleyanusandmesodesmamactroidespopulationsinargentina
AT sanchezdebockmf influenceofbeachmorphodynamicsonthebivalvedonaxhanleyanusandmesodesmamactroidespopulationsinargentina
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