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Fecundity and reproductive period of Paradella dianae and Uromunna sp. (Peracarida, Isopoda) associated with prop roots of Rhizophora mangle in a tropical coastal lagoon, SE Gulf of California, Mexico

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Specimens of the estuarine isopods, Uromunna sp. and Paradella dianae living among Rhizophora mangle prop roots in a SE Gulf of California coastal lagoon system were collected from 11 stations, from October 1997 to September 1998. Among the ovigerous females, there was a positive, significant relationship between clutch size and TL for both species. The average size at first sexual maturity was estimated to be 1.54 mm with an average fecundity of 11 eggs for Uromunna sp. In the case of P. dianae, the average size at first sexual maturity was estimated to be 4.81 mm with an average fecundity of 19 eggs. On the basis of proportion and frequency of appearance of ovigerous females, prop roots in Urías seem more suitable as a reproductive habitat for Uromunna sp. than for P. dianae. Des exemplaires de deux espèces d'isopodes d'estuaires, Uromunna sp. et Paradella dianae, associées aux racines aériennes de Rhizophora mangle dans une lagune côtière localisée au SE du golfe de Californie, on été récoltés dans 11 stations, entre octobre 1997 et septembre 1998. Une corrélation significative et positive a été obtenue entre la taille de la couvée et la longueur totale (TL) de la femelle dans le cas des deux espèces. La taille moyenne estimée à la première maturité sexuelle est de 1,54 mm, correspondant à une fécondité moyenne de 11 oeufs chez Uromunna sp. Dans le cas de P. dianae, la taille moyenne estimée à la première maturité sexuelle est de 4,81 mm et la fécondité moyenne de 19 oeufs. Prenant en considération la proportion et la fréquence d'apparition des femelles ovigères, les racines aériennes du système Urias semblent plus favorables comme habitat reproductif pour Uromunna sp. que pour P. dianae.


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