INVESTIGADORES
RUBILAR PANASIUK Cynthia Tamara
congresos y reuniones científicas
Título:
Sexual and asexual reproduction of Allostichaster capensis in Golfo Nuevo.
Autor/es:
RUBILAR, TAMARA; PASTOR DE WARD, CATALINA TERESA; DÍAZ DE VIVAR, MARÍA ENRIQUETA
Lugar:
Munich, Alemania
Reunión:
Conferencia; 11TH International Echinoderm Conference; 2003
Institución organizadora:
Ludwig Maximilians - Universitat
Resumen:
The reproductive cycle, sexual and asexual reproduction and the population structure of the fissiparous starfish, Allostichaster inaequalis, were examined for 24 months at Golfo Nuevo (Chubut, Argentina) and compared with its biochemical cycle. Gonadal indices revealed an annual reproductive cycle. Maturing occurred in late winter (August). Spawning occurred in September (spring). Piloric caecal indices showed a clear annual cycle and a reciprocal relationship with gonadal indices. The population appears to be maintained only by fission, as only two females were found and no larval recruitment was observed during the study period, since very small individuals were not found. A. inaequalis also showed an annual cycle of fission, showing the highest frequency of fission in spring and summer (from November to January), just after the spawning. Incidence of fission was correlated with environmental factors such as photoperiod, seawater temperature and salinity.
