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Effect of environmental factors on the abundance of decapod crustaceans from soft bottoms off southeastern Brazil

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Autor(es):
Furlan, Michele [1] ; Castilho, Antonio L. [1] ; Fernandes-Goes, Lissandra C. [2] ; Fransozo, Vivian [3] ; Bertini, Giovana [4] ; da Costa, Rogerio C. [5]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Inst Biociencias, Dept Zool, UNESP, BR-18618000 Botucatu, SP - Brazil
[2] Univ Estadual Piaui UESPI, BR-64202220 Parnaiba, PI - Brazil
[3] Univ Estadual Sudoeste Bahia UESB, Dept Ciencias Nat, BR-45031900 Vitoria Da Conquista, BA - Brazil
[4] Univ Estadual Paulista, Unidade Registro, UNESP, BR-11900000 Registro, SP - Brazil
[5] Univ Estadual Paulista, Fac Ciencias, UNESP, Dept Ciencias Biol, BR-17033360 Bauru, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Anais da Academia Brasileira de Ciências; v. 85, n. 4, p. 1345-1356, Out. 2013.
Citações Web of Science: 14
Resumo

This study investigated the importance of variations in environmental factors affecting the abundance patterns of decapods on the southeastern Brazilian coast. Sampling was carried out monthly from January 1998 through December 1999 in Ubatumirim and Mar Virado, Ubatuba region, using a commercial shrimp fishing boat equipped with double-rig nets. Six areas adjacent to rocky shores were chosen. Bottom-water samples were collected using a Nansen bottle, to measure the temperature and salinity. Sediment samples were also obtained by means of a Van Veen grab, for determination of texture and organic-matter content. The association of environmental factors with species abundance was evaluated by Canonical Correspondence Analysis (α = 0.05). Forty-one species of Decapoda were used in the multivariate analysis. The analysis indicated that sediment texture (phi) and bottom temperature were the main factors correlated (p < 0.05) with the spatial and temporal abundance of the species. Considering the study region as faunal transition zone, including a mixture of species of both tropical and subantarctic origin, the species responded differently to environmental factors, mainly temperature. It is conceivable that the decapods adjust their distribution according to their intrinsic physiological limitations, possibly as a result of the available resources. (AU)