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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Histological changes in the ovary during the annual breeding cycle in Agama impalearis Boettger, 1874 (Reptilia : Agamidae)

EH El Mouden, M Znari and H Francillon-Vieillot (2001)

Histological changes in the ovary during the annual breeding cycle in Agama impalearis Boettger, 1874 (Reptilia : Agamidae)

BELGIAN JOURNAL OF ZOOLOGY, 131(1):17-30.

The aim of the present work is to investigate the female reproductive cycle of the North African agamid, Agama impalcaris. Histological changes of the whole ovarian cycle were described. Folliculogenesis and oocyte growth were comparable to the general lizard pattern. A single germinal bed per ovary was found. Only previtellogenic follicles were present during the non reproductive period and the onset of vitellogenesis was observed just after emergence from winter dormancy. Two vitellogenic cycles which probably produce two successive clutches per breeding season were observed. The number of vitellogenic follicles can reach 12 per ovarian vitellogenic cycle. The oocyte growth was accompagnied by changes in the theca, granulosa, zona pellucida and zona radiata layers. The postovulatory follicles (corpora lutea) were observed until the onset of the second vitellogenic cycle and disappeared rapidly after them. Two kinds of atretic follicles, hydratation stage and vitellogenic stage atretic follicles, were described. Atresia was less frequent in Agama impalearis and particularly concerned with larger vitellogenic follicles.

BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
1903-1923
​Annales de la Société royale malacologique et zoologique de Belgique
 
1923-1989
Annales de la Société Royale Zoologique de Belgique
 
1989-
Belgian Journal of Zoology