Reproductive cycle and feeding periodicity in the starfishAstropecten brasiliensisin the Cabo Frio upwelling ecosystem (Brazil)

Autor:	J. S. Santos, A. P.C. Falcão, C. R.R. Ventura, C. S. Fiori
Rok vydání:	1997
Předmět:	Larva Gonad Ecology media_common.quotation_subject Starfish Zoology Biology biology.organism_classification Predation Caecum medicine.anatomical_structure Phytoplankton medicine Upwelling Animal Science and Zoology Reproduction Developmental Biology media_common
Zdroj:	Invertebrate Reproduction & Development. 31:135-141
ISSN:	2157-0272 0792-4259
Popis:	Summary Monthly collections of Astropecten brasiliensis were made at depths of 30 and 45 m. The highest number of prey in the stomach occured in summer in both 1987 and 1988. Specimens larger than4 cm in radius had mature gonads. The reproductive cycle was determined by gonad indices and histological analysis of gonads. In 1988, the species exhibited an annual reproductive cycle with spawning in December. The pyloric caecum indices showed the highest values between April and July. The relationship between gonad index and pyloric caecum index was inverse. The pyloric caecum peak occurred during the down welling period (fall and winter) when warm tropical waters (Brazil Current) were inshore. The reproductive peak coincided with the upwelling period (during spring and summer) enabling the larvae to benefit from the richer water condition when phytoplankton are more abundant.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f98550b9e89a41364928df5c70537dd7 https://doi.org/10.1080/07924259.1997.9672571 Zobrazit plný text záznamu