<b>Population features of the western Atlantic hermit crab Pagurus exilis (Anomura, Paguridae) in Brazil</b>

Authors

  • Fernando Luis Mantelatto
  • Danillo L. A. Espósito
  • Mariana Terossi
  • Renata Biagi
  • Andrea L. Meireles

DOI:

https://doi.org/10.5088/atlântica.v29i2.705

Keywords:

estrutura populacional, período reprodutivo, razão sexual, population structure, reproductive period, sex ratio

Abstract

The population structure of the hermit crab Pagurus exilis has been studied in Caraguatatuba region (23o 34’ and 23o 51’S; 45o 10’ and 45o 26’W), northern coast of São Paulo, Brazil for the first time in terms of total and seasonal size frequency distribution, sex ratio and reproductive season. The animals were monthly collected during two consecutive years (2001/2003) with a fishery boat equipped with “double rig” nets. At the laboratory, the specimens were identified, counted, weighed and measured. A total of 1,963 animals were captured, which 1,372 were males and 591 females (311 non ovigerous females and 280 ovigerous ones). The size of animal (Cephalothoracic Shield Length) ranged from 2.4 to 8.3 mm, and males were significantly larger, showing a sexual dimorphism. The size frequency distribution showed an unimodal pattern with non-normal distribution. The total sex ratio was significantly different from the expected, biased to males (1:0.43). Most ovigerous females presented eggs in initial developmental stage, with a few percentages in intermediary and final stages. The profile found an abundant population with a continuous reproduction (ovigerous females occurring along the year).

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Author Biographies

Fernando Luis Mantelatto

Atualmente é Professor Assistente (livre docente) na Universidade de São Paulo, USP. Pós-Doutorado pela University of Louisiana at Lafayette, EUA.

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Danillo L. A. Espósito

Graduação em Ciências Biológicas. Universidade de São Paulo, USP.

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Mariana Terossi

Doutorado em Biologia Comparada pela Universidade de São Paulo, USP.

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Renata Biagi

Laboratory of Bioecology and Crustacean Systematics, Department of Biology, FFCLRP, Universidade de São Paulo (USP).

Andrea L. Meireles

Atualmente é bolsista de Pós-Doutorado pelo CAUNESP.

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Published

2011-03-26

How to Cite

Mantelatto, F. L., Espósito, D. L. A., Terossi, M., Biagi, R., & Meireles, A. L. (2011). <b>Population features of the western Atlantic hermit crab Pagurus exilis (Anomura, Paguridae) in Brazil</b>. Atlântica (Rio Grande), 29(2), 107–114. https://doi.org/10.5088/atlântica.v29i2.705

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