Reproductive Cycle of Marphysa sanguinea Montagu, 1815 Polychaeta: Eunicidae in the Lagoon of TunisReport as inadecuate




Reproductive Cycle of Marphysa sanguinea Montagu, 1815 Polychaeta: Eunicidae in the Lagoon of Tunis - Download this document for free, or read online. Document in PDF available to download.

The Scientific World JournalVolume 2013 2013, Article ID 624197, 7 pages

Research Article

Laboratoire de Biologie de la Reproduction et du Développement Animal, Faculté des Sciences de Tunis, Campus Universitaire, El Manar 2092 Tunis, Tunisia

Laboratoire de Biologie Animale, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cédex, France

Received 29 March 2013; Accepted 22 April 2013

Academic Editors: R. R. de Souza and Q. Y. Sun

Copyright © 2013 Monia El Barhoumi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The reproductive cycle of Marphysa sanguinea Polychaeta: Eunicidae was studied in the Lagoon of Tunis between May 2006 and May 2007. M. sanguinea is a gonochoric species. There were no morphological differences between males and females, and spawning occurred without epitokal metamorphosis. Gonads are not well defined in either sex. The process of spermatogenesis takes place in the coelomic cavity. Mature males show all stages of spermiogenesis at any one time. The ovaries of M. sanguinea consist of coelomic germ-cell clusters surrounded by a thin envelope of follicle cells derived from the peritoneum. Germ cells in premeiotic and previtellogenic phases are observed in one cluster. In each cluster the more differentiated oocytes detach and float free in the coelomic cavity where they undergo vitellogenesis as solitary cells. The cytoplasmic material of the mature oocytes diameter superior to 200 μm is asymmetrically distributed; large lipid droplets and large yolk spheres occupy the vegetal pole of the oocyte while smaller yolk spheres are situated in the animal hemisphere. The female coelomic puncture has a heterogeneous aspect and shows different oocyte diameters. The reproductive period is more intense in winter period from January to March. Spawning occurs mainly in April.





Author: Monia El Barhoumi, Patrick Scaps, and Fathia Zghal

Source: https://www.hindawi.com/



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