EMBRYONIC DEVELOPMENT OF THE LEMON-YELLOW TREE FROG, Hyla savignyi AUDOUIN, 1827


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Karanlık Ş., Najafı-Majd E., Yıldırım Caynak E., Kaya U.

Communications/ Faculty of Sciences University of Ankara Series C: Biology and Geological Engineering and Geophysical Engineering, vol.32, no.2, pp.192-207, 2023 (Peer-Reviewed Journal)

Abstract

Amphibians are widely used in temperature adaptation studies due to their compatibility in laboratory experiments. We investigated the embryonic development stages (from fertilization to 25th) of Hyla savignyi following Gosner’s generalized table. Three pairs of H. savignyi were collected during the breeding season (February 2015) from Northern Cyprus, Kalkanlı Region and maintained at 21±1 °C in the laboratory. The samples were set in 3 groups and examinations of embryos and photographs taken every 10 minutes were carried out during the 9-days embryonic period. Embryos hatched at stage 20 or 21 come up to 3rd – 4 th days after fertilization. Embryonic development of H. savignyi is about 157 hours (7 days). Cleavage is unequal holoblastic. The embryonic developmental stages of H. savignyi were compared with the result of a similar study of two other Hyla species (H. orientalis and H. annectans) at various temperatures, and the possible temporal effect of the temperature and ovum size on the growth rate of these species was discussed.