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, J.A., López Gappa, J., Tablado, A.
Formato: JOUR
Materias:
Balanus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02780372_v18_n1_p128_Calcagno
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_02780372_v18_n1_p128_Calcagno2023-10-03T15:16:50Z Population dynamics of the barnacle Balanus amphitrite in an intertidal area affected by sewage pollution Calcagno, J.A. López Gappa, J. Tablado, A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, J.A.
López Gappa, J.
Tablado, A.
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.
format JOUR
author Calcagno, J.A.
López Gappa, J.
Tablado, A.
author_facet Calcagno, J.A.
López Gappa, J.
Tablado, A.
author_sort Calcagno, J.A.
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
url http://hdl.handle.net/20.500.12110/paper_02780372_v18_n1_p128_Calcagno
work_keys_str_mv AT calcagnoja populationdynamicsofthebarnaclebalanusamphitriteinanintertidalareaaffectedbysewagepollution
AT lopezgappaj populationdynamicsofthebarnaclebalanusamphitriteinanintertidalareaaffectedbysewagepollution
AT tabladoa populationdynamicsofthebarnaclebalanusamphitriteinanintertidalareaaffectedbysewagepollution
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