INVESTIGADORES
RUBILAR PANASIUK Cynthia Tamara
artículos
Título:
Sexual and asexual reproduction of Allostichaster capensis (Echinodermata: Asteroidea) in Golfo Nuevo.
Autor/es:
RUBILAR, TAMARA; PASTOR DE WARD, CATALINA TERESA; DÍAZ DE VIVAR ,MARÍA ENRIQUETA
Revista:
MARINE BIOLOGY
Editorial:
Springer
Referencias:
Año: 2005 vol. 146 p. 1083 - 1090
ISSN:
0025-3162
Resumen:
Sexual and asexual reproduction of the fissiparous starfish Allostichaster capensis were examined for 24 months at Bahý´ a Kaiser, Golfo Nuevo, Chubut, Argentina. Gonad indices revealed an annual reproductive cycle, with peak development occurring in late winter (August). Spawning occurred in spring (September). Pyloric caeca indices displayed a clear annual cycle and a reciprocal relationship with gonad indices, showing the storage function of pyloric caeca. The starfish population appears to be largely maintained by fission, as only two females were found. A. capensis also showed an annual cycle of fission, with the highest frequency in spring and summer (from November to January), just after spawning. Incidence of fission was correlated with environmental factors such as photoperiod, seawater temperature, and salinity.
