Resumo
Annual fluetuation of densities and population strueture of Armases angustipes (Dana, 1852) from a rocky shore at Farol Island, Matinhos, Paraná, Brazil (25º51'S and 48º32'W) were studied. The population strueture was treated in the following aspects: sexual proportion, dial intensity of activities, size composition and its fluetuation, and general condition of the crabs. The collections were made monthly, from January to December 1991. The samples were obtained handly, in the morning and at night, at the supratidal zone during low tides. There were caught 1,139 crabs, among which 34 were juveniles, 544 males, 555 females and 4 ovigerous females. Population density was highest in April (19.56 ind.m"² ) and in October (23.86 ind.m"² ). The sexual proportion was 1:1 in eleven months. Although the male crabs were more abundant than the females in May, there was not any statistical significam difference between the sexes. The activity of the population is intenser at night than at morning for both sexes. The recruitment of juveniles oceurs mainly in March, April and July. The condition factor in females is related to the reproduetive period. The population can migrate to the terrestrial habitat near the supratidal zone.
Armases angustipes; crabs; population strueture; rocky shore; Matinhos; Brazil
Armases angustipes; crabs; population strueture; rocky shore; Matinhos; Brazil
Estrutura populacional de Armases angustipes (Dana) (Decapoda, Brachyura, Grapsidae) na Ilha do Farol, Matinhos, Paraná1 1 Contribuição número 1120 do Departamento de Zoologia, Universidade Federal do Paraná.
Population structurc of Armases angustipes (Dana) (Decapoda, Brachyura, Grapsidae) from Farol Island, Matinhos, Paraná
Vânia G.L. KowalczukI; Setuko MasunariII
IDepartamento de Biologia, Universidade Federal de Roraima. Campus do Paricarana, Rodovia BR 174, 69310-270 Boa Vista, Roraima, Brasil
IIDepartamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-990 Curitiba, Paraná, Brasil
ABSTRACT
Annual fluetuation of densities and population strueture of Armases angustipes (Dana, 1852) from a rocky shore at Farol Island, Matinhos, Paraná, Brazil (25º51'S and 48º32'W) were studied. The population strueture was treated in the following aspects: sexual proportion, dial intensity of activities, size composition and its fluetuation, and general condition of the crabs. The collections were made monthly, from January to December 1991. The samples were obtained handly, in the morning and at night, at the supratidal zone during low tides. There were caught 1,139 crabs, among which 34 were juveniles, 544 males, 555 females and 4 ovigerous females. Population density was highest in April (19.56 ind.m"2 ) and in October (23.86 ind.m"2 ). The sexual proportion was 1:1 in eleven months. Although the male crabs were more abundant than the females in May, there was not any statistical significam difference between the sexes. The activity of the population is intenser at night than at morning for both sexes. The recruitment of juveniles oceurs mainly in March, April and July. The condition factor in females is related to the reproduetive period. The population can migrate to the terrestrial habitat near the supratidal zone.
Key words:Armases angustipes, crabs, population strueture, rocky shore, Matinhos, Brazil.
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AGRADECIMENTOS. Ao Prof. Dr. Gustavo Augusto Schmidt de Melo, Museu de Zologia da Universidade de São Paulo, pela identificação da espécie em estudo. Ao Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) que através do Curso de Pós-Graduação em Ciências Biológicas Zoologia, Universidade Federal do Paraná, concedeu uma bolsa de mestrado à primeira autora para o desenvolvimento do presente trabalho.
Recebido em 04.III.1999; aceito em 17.I.2000.
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Datas de Publicação
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Publicação nesta coleção
22 Maio 2009 -
Data do Fascículo
Mar 2000
Histórico
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Recebido
04 Mar 1999 -
Aceito
17 Jan 2000
