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Temporal and bathymetric distribution of juveniles and adults of the speckled swimming crab Arenaeus cribrarius from coastal waters of southern Brazil

  • Alexandre Ribeiro da Silva EMAIL logo , João Gabriel Barioto , Raphael Cezar Grabowski and Antonio Leão Castilho
Published/Copyright: April 21, 2017
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Abstract

This study evaluated the temporal and bathymetric distribution of the speckled swimming crab Arenaeus cribrarius from coastal waters of southern Brazil. Monthly samples were taken at five distinct depths throughout one year in the adjacent area from Babitonga Bay, Southern Brazil. Data on environmental conditions (temperature, salinity, granulometry and organic matter) were collected and their association was tested using Multiple Linear Regression and Principal Component Analysis. Juveniles and adults showed different distribution patterns according to depth, with juveniles being more abundant in the shallower areas. The increase in temperature favors the juvenile distribution, while the distribution of adults was related to finer sediments. The pattern of distribution observed for adults might be associated with burrowing habits, or with the search for colder (and consequently deeper) waters, which are richer in nutrients. The high abundance of juveniles in shallower areas might be influenced by the Coastal Water mass that provides higher water temperatures in the summer, and by the Babitonga Bay estuarine complex, which can be an important source of organic matter. We conclude that this region represents a nursery ground for the studied species and is essential to preserve Babitonga Bay in order to maintain A. cribrarius in this region, since this area has suffered from anthropic impacts.

Acknowledgements

The authors are grateful to the Fundação para o Desenvolvimento da Unesp FUNDUNESP (#1214/2010 – DFP), the Pró Reitoria de Pesquisa – PROPE, and the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) for providing financial support during field collections and travel to other laboratories (Grants 2010/50188-8), and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES CIMAR # 23038.004310/2014-85) for financial support during analyses. The authors are indebted to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for providing research scholarship (PQ 308653/2014-9). We are also grateful to Dr. Jorge Laço Portinho for helping during analyses. We thank many colleagues from the NEBECC and LABCAM group who helped with sampling and laboratory analyses; and the Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA) for granting permission to collect the material.

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Received: 2016-9-9
Accepted: 2017-1-15
Published Online: 2017-4-21
Published in Print: 2017-3-1

© 2017 Institute of Zoology, Slovak Academy of Sciences

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