+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Sexual differentiation as a function of the incubation temperature of eggs in the sea turtle dermochelys coriacea

Amphibia-Reptilia 6(1): 83-92
Sexual differentiation as a function of the incubation temperature of eggs in the sea turtle dermochelys coriacea
Eggs of Dermochelys coriacea were incubated in the laboratory at different constant temperatures between 27 and C up to hatching. The genital system of 72 neonates and 11 embryos were dissected and processed for histological study. All the individuals from the 27, 28 and C incubations were phenotypic males. In the testes, the medulla was voluminous and very dense, composed of many epithelial cords, some enclosing germ cells, whereas the surface was covered by a thin layer of epithelial cells between which germ cells were still visible. The Mullerian ducts were in the process of regression. In all the individuals from eggs incubated at 29.75, 30.5 and C, the gonads were somewhat longer than testes but were considerably reduced in width and thickness. The medulla was strongly inhibited, showing similar epithelial cords but much less numerous than in testes. The epithelium of the gonadal surfae was pseudostratified and enclosed germ cells which had not enter meiotic prophase as in typical ovarian cortex. The Mullerian ducts were complete. These individuals were classified as potential females. These results show that temperature influences sexual differentiation of the gonads of Dermochelys coriacea and indicate that the threshold temperature (or pivotal temperature) lies between 28.75 and C. They also reinforce fears about masculinising turtle populations by incubating eggs at cool temperatures in artificial hatcheries.

(PDF 0-2 workdays service: $29.90)

Accession: 006408308

Related references

Temperature sensitivity of sexual differentiation in the leatherback dermochelys coriacea vandelli 1761 data from artificial incubation applied to the study of sex ratio in nature. Annales des Sciences Naturelles Zoologie et Biologie Animale 8(4): 277-290, 1986, 1987

White spot development incubation and hatching success of leatherback turtle dermochelys coriacea eggs from rantau abang malaysia. Copeia (1): 42-47, 1989

Influence of the incubation temperature of eggs on the hatchling sex ratio in the leatherback dermochelys coriacea. Bulletin de la Societe Zoologique de France 110(3): 355-360, 1985

Occurrence of the leatherback turtle Dermochelys coriacea in Tunisian waters Presence de la tortue luth Dermochelys coriacea dans les eaux tunisiennes. Rapports et Proces-Verbaux des Reunions Commission Internationale pour l'Exploration Scientifique de la Mer Mediterranee Monaco, 352: 382-383, 1998

Incubation temperatures and sex-ratios in the Malaysian leatherback turtle Dermochelys coriacea. Biological Conservation. 74(3): 169-174, 1995

First observations in Metropolitan France of a leatherback turtle Dermochelys coriacea ringed in Guyana Premiere observation en France metrolopitaine dune tortue Luth, Dermochelys coriacea baguee en Guyane. Annales de la Societe des Sciences Naturelles de la Charente-Maritime. Mars; 85: 515-518, 1996

Effects of handling on hatchability of eggs of the leatherback turtle, Dermochelys coriacea (L.). Pertanika, 82: 265-271, 1985

A Leathery turtle Dermochelys coriacea Linnaeus coming ashore for laying eggs during the day. Journal of the Bombay Natural History Society, 56: 137-139, 1959

Oxygen consumption and energetics of development of eggs of the leatherback turtle, Dermochelys coriacea. Comparative Biochemistry & Physiology A Comparative Physiology 104(3): 449-453, 1993

Effects of nest depth and distance among transferred clutches of Dermochelys coriacea Linnaeus, 1766, on incubation temperature and survival of hatchlings at La Playona, Choco Colombia Efecto de la profundidad y la distancia entre nidadas trasladadas de Dermochelys coriacea Linnaeus, 1766, sobre la temperatura de incubacion y supervivencia de neonatos, en La Payona, Choco Colombia. Actualidades Biologicas (Medellin). July-December; 2783: 179-188, 2005