Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.3/1372
Título: Allocation of nutrients during the reproductive cycle of Ophidiaster ophidianus (Echinodermata: Asteroidea)
Autor: Micael, Joana
Rodrigues, Armindo
Barreto, Maria do Carmo
Alves, Maria J.
Malcolm, Jones
Costa, Ana C.
Palavras-chave: Biochemical Cycle
Strictly Protected Status
Temperate Zone
Data: 23-Mai-2011
Editora: Taylor & Francis
Citação: "Invertebrate Reproduction & Development". ISSN 2157-0272. Volume 55, Issue 4, 2011, pp. 1-12(12).
Resumo: The reproductive cycle of Ophidiaster ophidianus (strictly protected status) from Sa˜o Miguel Island, in the Azorean Archipelago was studied. The reproductive strategy; the energy allocation of each sex during the reproductive cycle and the nutritional condition of the population were analyzed. Gonadal index (GI) showed a clear seasonal pattern with spawning between August and October but histological examination revealed that gamete release can occur throughout the entire year. The pyloric caeca index (PCI) showed little annual variation but with an inverse relationship with the GI. Allocation of energy to the gonads and to the pyloric caeca reflected the seasonal reproductive strategy of this species. Individuals were able to simultaneously develop gonads, pyloric caeca, and quickly regenerate lost arms. There was a major expenditure of energy by females compared to males but, sexual size dimorphism was not observed. The reproductive pattern observed in O. ophidianus combining rich food availability and seawater temperatures characteristic of a temperate zone may be the key to the success of this species in the Azorean oceanic Island.
Descrição: Copyright © 2011 Taylor & Francis.
Peer review: yes
URI: http://hdl.handle.net/10400.3/1372
ISSN: 0792–4259 (Print)
2157-0272 (Online)
Versão do Editor: http://dx.doi.org/10.1080/00207233.2011.573673
Aparece nas colecções:DBIO - Artigos em Revistas Internacionais / Articles in International Journals

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