Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina

After a massive mortality of the dominant species (the clam Mesodesma mactroides) occurred in 1995, changes in the intertidal community in sandy beaches of Argentina were monitored. Eight sampling stations were established in a 40 km open stretch and samples were taken every October each year up to...

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Detalles Bibliográficos
Autor principal: Dadon, José Roberto
Publicado: 2005
Materias:
Argentina species interactions
Donax hanleyanus
Mesodesma mactroides
Sandy beaches benthos
Surf clams
Bivalvia
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00678546_v74_n1-2_p_Dadon
http://hdl.handle.net/20.500.12110/paper_00678546_v74_n1-2_p_Dadon
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00678546_v74_n1-2_p_Dadon
record_format dspace
spelling paper:paper_00678546_v74_n1-2_p_Dadon2023-06-08T15:06:20Z Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina Dadon, José Roberto Argentina species interactions Donax hanleyanus Mesodesma mactroides Sandy beaches benthos Surf clams Bivalvia Donax hanleyanus Mesodesma mactroides After a massive mortality of the dominant species (the clam Mesodesma mactroides) occurred in 1995, changes in the intertidal community in sandy beaches of Argentina were monitored. Eight sampling stations were established in a 40 km open stretch and samples were taken every October each year up to 2001. Biomass, density, size frequency distribution and mean growth rates for the most abundant species were analyzed. During the mortality event, only the benthic stages of M. mactroides were affected, their total mean biomass diminishing from 1,399 g to 2 g per running meter beach. Post-mortality recruitment was normal and the growth rates for the youngest cohorts were similar to those previously reported. After a two years' lag, the wedge clam Donax hanleyanus replaced M. mactroides as the dominant species, increasing from 6.0 g/m up to 24.3 g/m. However, dominance replacement did not restore the productivity of the intertidal macrobenthic assemblage and, despite the increment of D. hanleyanus stocks, the community total biomass remained < 1% of the pre-mortality levels. Since 1998 on, M. mactroides and D. hanleyanus showed several peaks in abundance. Disturbance, mainly due to non-regulated fisheries, has been delaying the community recovery. Taking into account the interactions among species and human activities, the present individual resourcebased management should be replaced by an integrated systembased management program including both conservation and tourism requirements. Fil:Dadon, J.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00678546_v74_n1-2_p_Dadon http://hdl.handle.net/20.500.12110/paper_00678546_v74_n1-2_p_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 Argentina species interactions
Donax hanleyanus
Mesodesma mactroides
Sandy beaches benthos
Surf clams
Bivalvia
Donax hanleyanus
Mesodesma mactroides
spellingShingle Argentina species interactions
Donax hanleyanus
Mesodesma mactroides
Sandy beaches benthos
Surf clams
Bivalvia
Donax hanleyanus
Mesodesma mactroides
Dadon, José Roberto
Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina
topic_facet Argentina species interactions
Donax hanleyanus
Mesodesma mactroides
Sandy beaches benthos
Surf clams
Bivalvia
Donax hanleyanus
Mesodesma mactroides
description After a massive mortality of the dominant species (the clam Mesodesma mactroides) occurred in 1995, changes in the intertidal community in sandy beaches of Argentina were monitored. Eight sampling stations were established in a 40 km open stretch and samples were taken every October each year up to 2001. Biomass, density, size frequency distribution and mean growth rates for the most abundant species were analyzed. During the mortality event, only the benthic stages of M. mactroides were affected, their total mean biomass diminishing from 1,399 g to 2 g per running meter beach. Post-mortality recruitment was normal and the growth rates for the youngest cohorts were similar to those previously reported. After a two years' lag, the wedge clam Donax hanleyanus replaced M. mactroides as the dominant species, increasing from 6.0 g/m up to 24.3 g/m. However, dominance replacement did not restore the productivity of the intertidal macrobenthic assemblage and, despite the increment of D. hanleyanus stocks, the community total biomass remained < 1% of the pre-mortality levels. Since 1998 on, M. mactroides and D. hanleyanus showed several peaks in abundance. Disturbance, mainly due to non-regulated fisheries, has been delaying the community recovery. Taking into account the interactions among species and human activities, the present individual resourcebased management should be replaced by an integrated systembased management program including both conservation and tourism requirements.
author Dadon, José Roberto
author_facet Dadon, José Roberto
author_sort Dadon, José Roberto
title Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina
title_short Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina
title_full Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina
title_fullStr Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina
title_full_unstemmed Changes in the intertidal community structure after a mass mortality event in sandy beaches of Argentina
title_sort changes in the intertidal community structure after a mass mortality event in sandy beaches of argentina
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00678546_v74_n1-2_p_Dadon
http://hdl.handle.net/20.500.12110/paper_00678546_v74_n1-2_p_Dadon
work_keys_str_mv AT dadonjoseroberto changesintheintertidalcommunitystructureafteramassmortalityeventinsandybeachesofargentina
_version_ 1768542356015939584

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