IMBECU   20882
INSTITUTO DE MEDICINA Y BIOLOGIA EXPERIMENTAL DE CUYO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Development of follicles and eggs and hormone levels in Caiman latirostris (Crocodylia, Alligatoridae) in Argentina
Autor/es:
PORTELINHA, T; JAHN GA; HAPON M. BELÉN; VERDADE, L.M.; PIÑA, C
Lugar:
Louisiana
Reunión:
Workshop; 23rd. Working meeting of the Crocodile Specialist Group.; 2014
Institución organizadora:
University of Lake Charles
Resumen:
Development of follicles and eggs and hormone levels in Caiman latirostris (Crocodylia, Alligatoridae) in Argentina Portelinha, T.C.G.1, 2, 3; Jahn, G.A.4; Hapon, M.B.4; Verdade, L.M.5; Piña, C.I.1, 2, 6 1 Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción (CICyTTP-CONICET) Diamante, Entre Ríos - Argentina. 2 Proyecto Yacaré. Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC - UNL/MASP y MA), Santa Fe - Argentina. 3 Curso de Engenharia Ambiental. Universidade Federal do Tocantins (UFT), Palmas - Brasil. thiagoportelinha@yahoo.com.br 4 LARLAC-IMBECU (CONICET), Mendoza ? Argentina. 5 Laboratório de Ecologia Isotópica / CENA / Universidade de São Paulo, Piracicaba - Brasil. lmverdade@usp.br 6 Facultad de Ciencias y Tecnología (FCyT), Universidad Autónoma de Entre Ríos (UADER). Facultad de Ciencias de la Alimentación, Universidad Nacional de Entre Ríos. cidcarlos@infoaire.com.ar Despite a lot of information about Caiman latirostris reproduction is available, the percentage of adult females actively reproductive over a year is lacking, and this information can help in estimating some population parameters such as population size based on nests counting. In this study we monitored and determined the development of follicles and eggs, and correlated these results with plasma steroid hormone levels. Field work was carried out during two reproductive periods (October-January) between 2010 and 2012 in Santa Fe, Argentina. An ultrasound device was used to take images of the reproductive structures of adult females. We examined reproductive structures of 32 adult females: vitelogenic follicles (n=5), eggs (n=4), atretic follicles (n=11) and no reproductive structure identified (n=12). High levels for estradiol were found during ovulation (November). During nesting (December and January) no difference was found in estradiol between reproductive and non reproductive females. During end of nesting (January) no differences in estradiol was found between reproductive, non-reproductive and females with atretic follicles. There was no difference between progesterone levels for reproductive females during the studied period, but they showed higher levels during nesting (December) than non-reproductive females. We found no differences for progesterone level between reproductive and females with atretic follicles during end of nesting (January). Ultrasound evidenced to be an efficient non-invasive technique to study reproductive structures at the beginning of reproductive cycle of the broad-snouted caiman.