Biology of <Emphasis Type="Italic">Grapsus grapsus</Emphasis> (L<Emphasis Type="SmallCaps">innaeus</Emphasis>, 1758) (Brachyura,Grapsidae) in the Saint Peter and Saint Paul Archipelago,Equatorial Atlantic Ocean |
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Authors: | Email author" target="_blank">A?S?FreireEmail author M?A?A?Pinheiro H?Karam-Silva M?M?Teschima |
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Institution: | 1.Laboratório de Crustáceos/Plancton, Departamento de Ecologia e Zoologia, CCB/UFSC,Campus Universitário Trindade,Florianópolis,Brazil;2.Grupo de Pesquisa em Biologia de Crustáceos (CRUSTA), UNESP/Campus Experimental do Litoral Paulista (CLP),S?o Vicente,Brazil |
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Abstract: | Eleven expeditions were undertaken to the Saint Peter and Saint Paul Archipelago to study the reproductive biology of Grapsus grapsus, providing additional information on limb mutilation and carapace colour. MATURE software was used to estimate morphological
maturity, while gonadal analyses were conducted to estimate physiological maturity. The puberty moult took place at larger
size in males (51.4 mm of carapace length) than in females (33.8 mm), while physiological maturity occurred at a similar size
in males (38.4 mm) and in females (33.4 mm). Above 50 mm, the proportion of red males increased in the population, indicating
that functional maturity is also related to colour pattern. Small habitat and high local population density contributed to
the high rate of cannibalism. The low diversity of food items, absence of predators of large crabs and high geographic isolation
are the determinants of unique behavioural and biological characteristics observed in the G. grapsus population. |
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