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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The hermit crab Sympagurus dimorphus (Anomura: Parapaguridae) at the edge of its range in the south-western Atlantic Ocean: population and morphometry features

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Autor(es):
Schejter, Laura [1] ; Mantelatto, Fernando L. [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Consejo Nacl Invest Cient & Tecn CONICET, Inst Invest Marinas & Costeras IIMyC, Inst Nacl Invest & Desarrollo Pesquero INIDEP, Mar Del Plata, Buenos Aires - Argentina
[2] Univ Sao Paulo, Lab Bioecol & Crustacean Systemat LBSC, Fac Philosophy Sci & Letters Ribeirao Preto FFCLR, Dept Biol, BR-14049 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Natural History; v. 49, n. 33-34, p. 2055-2066, SEP 10 2015.
Citações Web of Science: 1
Resumo

Sympagurus dimorphus is one of the 12 hermit crab species recorded for Argentinean waters. Despite the high abundance registered in some scallop fishing grounds, its biology remains little known. In the present study, we analysed some population features of S. dimorphus living in symbiosis with Epizoanthus paguricola from a series of samples taken in the Argentine Sea, south-western Atlantic Ocean. Our results showed that S. dimorphus was commonly found from 40oS to lower latitudes, in a patchy distribution along the shelf-break front. The overall sex ratio was 1:1. The smallest ovigerous female measured 6mm in cephalothoracic shield length and this size was used as parameter to define the size of juveniles. The sex ratio size class pattern corresponded to Type IV or anomalous curve. S. dimorphus is a dimorphic species, as evidenced by the larger size of the males and the positive allometric growth of the right cheliped. The species also showed asymmetry, with the left uropod always larger than the right one. To the best to our knowledge, this is the first report on population features and relative growth for a member of the genus, based on long-term sampling. This species presents a patchy distribution along the shelf-break of Argentina. Its density tended to decrease over the five-year sampling period regarding the recruitment of hermits associated with colonies of zoanthids. In addition, the relatively homogeneous nature of this refuge does not seem to influence the growth of the hermit crab, which presents sexual dimorphism in relation to the sex/size conditions. (AU)

Processo FAPESP: 10/50188-8 - Crustáceos decápodes: multidisciplinaridade na caracterização da biodiversidade marinha do estado de São Paulo (taxonomia, espermiotaxonomia, biologia molecular e dinâmica populacional) (Biodiversidade Marinha)
Beneficiário:Fernando Luis Medina Mantelatto
Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático