Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution

Recruitment and mortality patterns in an intertidal population of Balanus amphitrite were studied for 4.5 years close to a sewage outfall near Quequen, Argentina. Recruitment occurred mainly during summer, although a small proportion of the population recruited in autumn. As a consequence of the fai...

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Autores principales: Calcagno, Javier Angel, Tablado, Alejandro
Publicado: 1998
Materias:
Balanus
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02780372_v18_n1_p128_Calcagno
http://hdl.handle.net/20.500.12110/paper_02780372_v18_n1_p128_Calcagno
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02780372_v18_n1_p128_Calcagno
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spelling paper:paper_02780372_v18_n1_p128_Calcagno2023-06-08T15:26:40Z Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution Calcagno, Javier Angel Tablado, Alejandro Balanus Recruitment and mortality patterns in an intertidal population of Balanus amphitrite were studied for 4.5 years close to a sewage outfall near Quequen, Argentina. Recruitment occurred mainly during summer, although a small proportion of the population recruited in autumn. As a consequence of the failure of 4 successive annual recruitments, population density decreased almost steadily from 130 to 6 ind·m-2. With the exception of the postsettlement period, which was not considered in the present study, mortality was gradual during benthic life. The number of barnacles dying per unit time decreased as annual cohorts grew older. Mean longevity was estimated to be 22 months. Maximal longevity attained 5-6 years. Between 4 and 6 cohorts coexisted during the study period. The percentage of dead barnacles found with empty shells still attached to the substratum was higher in winter/spring than in summer/autumn, and increased with age. The causes of the extended life history of B. amphitrite at Quequen may be related to low temperature, low population density, and near absence of intraspecific competition and predation. The population studied seems to be regulated by recruitment and physical disturbance. Fil:Calcagno, J.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tablado, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02780372_v18_n1_p128_Calcagno http://hdl.handle.net/20.500.12110/paper_02780372_v18_n1_p128_Calcagno
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Balanus
spellingShingle Balanus
Calcagno, Javier Angel
Tablado, Alejandro
Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution
topic_facet Balanus
description Recruitment and mortality patterns in an intertidal population of Balanus amphitrite were studied for 4.5 years close to a sewage outfall near Quequen, Argentina. Recruitment occurred mainly during summer, although a small proportion of the population recruited in autumn. As a consequence of the failure of 4 successive annual recruitments, population density decreased almost steadily from 130 to 6 ind·m-2. With the exception of the postsettlement period, which was not considered in the present study, mortality was gradual during benthic life. The number of barnacles dying per unit time decreased as annual cohorts grew older. Mean longevity was estimated to be 22 months. Maximal longevity attained 5-6 years. Between 4 and 6 cohorts coexisted during the study period. The percentage of dead barnacles found with empty shells still attached to the substratum was higher in winter/spring than in summer/autumn, and increased with age. The causes of the extended life history of B. amphitrite at Quequen may be related to low temperature, low population density, and near absence of intraspecific competition and predation. The population studied seems to be regulated by recruitment and physical disturbance.
author Calcagno, Javier Angel
Tablado, Alejandro
author_facet Calcagno, Javier Angel
Tablado, Alejandro
author_sort Calcagno, Javier Angel
title Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution
title_short Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution
title_full Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution
title_fullStr Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution
title_full_unstemmed Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution
title_sort population dynamics of the barnacle balanus amphitrite in an intertidal area affected by sewage pollution
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02780372_v18_n1_p128_Calcagno
http://hdl.handle.net/20.500.12110/paper_02780372_v18_n1_p128_Calcagno
work_keys_str_mv AT calcagnojavierangel populationdynamicsofthebarnaclebalanusamphitriteinanintertidalareaaffectedbysewagepollution
AT tabladoalejandro populationdynamicsofthebarnaclebalanusamphitriteinanintertidalareaaffectedbysewagepollution
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