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GROWTH AND PRODUCTION OF THE BARNACLE BALANUS AMPHITRITE IN AN INTERTIDAL AREA AFFECTED BY SEWAGE POLLUTION

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ABSTRACT A low-density, intertidal population of the barnacle Balanus amphitrite was studied close to a sewage outfall near Quequén, Argentina. Barnacles were individually followed during 3 consecutive years. Growth rates observed in the present study (orifice length 4.9-5.1 mm at the end of the first year) were remarkably lower than values previously reported for this species. A Von Bertalanffy growth equation was fitted to length-age data (K = 0.4–0.5, L∞ = 8.5-8.8, T0 = -0.5 to -0.7). Growth and production were higher in summer/autumn than in winter/spring. The production/biomass ratio fluctuated between 0.3 and 0.4 for the whole population, but was highest (1.8-1.9) during the first year of benthic life. Based on analysis of length-frequency distributions and following the fate of marked specimens, we verified the coexistence of 5 annual cohorts and therefore a maximal longevity of more than 5 years. Possible causes of this extended life history of B. amphitrite in the study area arc discussed.

Affiliations: 1: (JAC) Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, (1428) Buenos Aires, Argentina; 2: (JLG) Museo Argentino de Ciencias Naturales "Bernardino Rivadavia," Av. A. Gallardo 470, (1405) Buenos Aires, Argentina. Correspondence to JLG. (e-mail: lgappa@mail.retina.ar); 3: (AT) Museo Argentino de Ciencias Naturales "Bernardino Rivadavia," Av. A. Gallardo 470, (1405) Buenos Aires, Argentina. Correspondence to JLG. (e-mail: lgappa@mail.retina.ar)

10.1163/1937240X97X00251
/content/journals/10.1163/1937240x97x00251
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/content/journals/10.1163/1937240x97x00251
2017-08-17

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