Hermit Crab Fauna from the Infralittoral Zone of Anchieta Island (Ubatuba, Brazil)

Mantelatto, Fernando L.; Garcia, Renata Biagi

doi:10.1007/978-1-4615-0761-1_22

Cited by 21 publications

(43 citation statements)

References 18 publications

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“…Moreover, the sexual dimorphism favours males during the intra-and interspeci¢c ¢ghts by shell, food, reproduction and territory. Females demonstrated a short life cycle and intense reproduction.Pagurus brevidactylus (Stimpson, 1859) is a small abundant hermit crab found in the infralittoral zone of Anchieta Island (Mantelatto & Garcia, 2002), as well as in the northern coast of Sa‹ o Paulo State. The biological aspects of this species in the western Atlantic region are poorly known (Mantelatto & Meireles, 2004).…”

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confidence: 99%

Population structure and growth of the hermit crab Pagurus brevidactylus (Anomura: Paguridae) from the northern coast of São Paulo, Brazil

2005

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The hermit crab Pagurus brevidactylus (Crustacea: Anomura: Paguridea) from the infralittoral area of Anchieta Island, Ubatuba, was characterized by population structure (size, sex ratio, reproduction and recruitment) and growth. Animals were collected monthly during 1999 by SCUBA diving. A total of 1525 individuals was collected (633 males and 892 females), 695 of them were ovigerous females. Overall sex ratio was 0.7:1 in favour of females. The crabs showed a unimodal distribution with males signi¢cantly larger than females. Ovigerous females were collected during all months and in high percentages from 1.0 mm of shield length, demonstrating intense and continuous reproduction. The longevity was approximately 24 months for males and 18 for females, which showed larger growth rate and reached sexual maturity earlier (two months) than males. The low number of males in this population may be due to the longer life span. Moreover, the sexual dimorphism favours males during the intra-and interspeci¢c ¢ghts by shell, food, reproduction and territory. Females demonstrated a short life cycle and intense reproduction.Pagurus brevidactylus (Stimpson, 1859) is a small abundant hermit crab found in the infralittoral zone of Anchieta Island (Mantelatto & Garcia, 2002), as well as in the northern coast of Sa‹ o Paulo State. The biological aspects of this species in the western Atlantic region are poorly known (Mantelatto & Meireles, 2004). Therefore, the objective of the present study was to describe the population structure (size, sex ratio, reproduction and recruitment) and the growth in the ¢eld of the population inhabiting Anchieta Island, Brazil.Hermit crabs were collected monthly from January to December 1999 in the infralittoral area of Anchieta Island (23832 0 S 45804 0 W), which is an ecological reserve of the northern coast of Sa‹ o Paulo State, Brazil. Animals were collected in the daytime by two people during 30 minutes of SCUBA diving.Animals were frozen and transported to the laboratory where they were removed from their shells and immediately weighed. Sex was determined from the gonopore position; the presence of eggs at the pleopods determined ovigerous females, being the maturity of males and females based on the size of the smallest ovigerous females. Shield length (SL, from the tip of the rostrum to the V-shaped groove at the posterior edge), measured under a compound light microscope equipped with a camera lucida (50Â), was the measurement of size of the hermit crabs.Hermit crabs were grouped in size-classes of 0.2 mm SL, and the sex ratio for each was calculated. The reproductive period was evaluated by percentage of ovigerous females relative to the total number of females collected monthly. The KolmogorovŜ mirnov test was used to verify the normality of the sizef requency distribution of the individuals and the Pearson correlation to test for a correlation between the water temperature and the total of individuals collected monthly or the percentage of ovigerous females. The w 2 -test was used to evalu...

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confidence: 99%

Population structure and growth of the hermit crab Pagurus brevidactylus (Anomura: Paguridae) from the northern coast of São Paulo, Brazil

2005

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“…Considering the relatively small area of Anchieta Island compared to the range of the São Paulo coast, we considered that the diversity of majoids crabs was high. A high diversity was also recorded for the hermit crabs in this area (Mantelatto and Garcia, 2002) that could be related to the fact that this island constituted an habitat with favorable conditions to set up and reproduction of these animals. The first record of occurrence of the M. braziliensis for São Paulo State increased its geographical distribution, which was restricted from Piauí to Rio de Janeiro (Melo, 1996).…”

Section: Discussionmentioning

confidence: 69%

“…The physical and chemical features of the area have been described by Oliveira (1983) and Medeiros (1992). However, scientific information about the crustacean fauna is sparse, and among the available reports are the studies of Forneris (1969) about general fauna of invertebrates from soft bottom and Hebling et al (1994) and Mantelatto and Garcia (2002) on hermit crab fauna from nonconsolidate and rocky shore substrates, respectively.…”

Section: Study Areamentioning

confidence: 99%

Majoid crabs community (Crustacea: Decapoda) from infralittoral rocky/sandy bottom of Anchieta Island, Ubatuba

Mantelatto¹,

Faria²,

Biagi

et al. 2004

Braz. arch. biol. technol.

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“…It is important to note that the majority of specimens in all species reported here were found occupying gastropod shells in the natural populations (99.8% of the total) studied in the same region (Mantelatto et al, 2001;Mantelatto & Garcia, 2002).…”

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confidence: 79%

Unusual shelters occupied by Brazilian hermit crabs (Crustacea: Decapoda: Diogenidae)

2003

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Hermit Crab Fauna from the Infralittoral Zone of Anchieta Island (Ubatuba, Brazil)

Cited by 21 publications

References 18 publications

Population structure and growth of the hermit crab Pagurus brevidactylus (Anomura: Paguridae) from the northern coast of São Paulo, Brazil

Population structure and growth of the hermit crab Pagurus brevidactylus (Anomura: Paguridae) from the northern coast of São Paulo, Brazil

Majoid crabs community (Crustacea: Decapoda) from infralittoral rocky/sandy bottom of Anchieta Island, Ubatuba

Unusual shelters occupied by Brazilian hermit crabs (Crustacea: Decapoda: Diogenidae)

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