GROWTH, MORTALITY, AND REPRODUCTION OF EXCIROLANA BRAZILIENSIS RICHARDSON, 1912 (ISOPODA, CIROLANIDAE) ON THE PRAINHA BEACH, RIO DE JANEIRO, BRAZIL

With the aim of estimating the growth parameters, mortality, and reproduction of a population of Excirolana braziliensis, monthly samplings were performed in the period from June 1993 to May 1995 at Prainha Beach, Rio de Janeiro, Brazil. The average size at first sexual maturity was estimated to be...

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Bibliographic Details
Published in:Crustaceana 2000, Vol.73 (5), p.535-545
Main Authors: Fonseca, Duane, Veloso, Valéria, Cardoso, Ricardo
Format: Article
Language:English
Subjects:
Beaches
Coastal ecology
Coasts
Embryos
Excirolana braziliensis
Longevity
Marine
Marine ecology
Marine fishes
Mortality
Population growth
Sediments
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Summary:With the aim of estimating the growth parameters, mortality, and reproduction of a population of Excirolana braziliensis, monthly samplings were performed in the period from June 1993 to May 1995 at Prainha Beach, Rio de Janeiro, Brazil. The average size at first sexual maturity was estimated to be 6.9 mm (TL) with an average fecundity of 13 embryos per female. There was a significant linear regression between the clutch size and the length of the female. The growth analyses demonstrated that there is seasonality in growth with smaller rates coincident with lower temperatures. This paper discusses the existence of a size gradient, indicated by an increase in total length with decreasing temperatures. /// Com o objetivo de estimar os parâmetros de crescimento, mortalidade e reprodução de uma população de Excirolana braziliensis, amostragens mensais foram feitas no período entre Junho de 1993 e Maio de 1995 na Praia da Prainha (Rio de Janeiro, Brasil). O tamanho médio da primeira maturação sexual foi estimado em 6,9 mm (CT) com fecundidade média de 13 embriões por fêmea. Houve uma significativa regressão linear entre o tamanho da ninhada e o comprimento da fêmea. Foi observada sazonalidade no crescimento, com menores taxas coincidindo com temperaturas mais baixas. Este artigo discute a existência de um gradiente de tamanho, indicado pelo aumento do comprimento total com a diminuição da temperatura.
ISSN:0011-216X
1568-5403
DOI:10.1163/156854000504642