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Détermination de l'âge de Triturus marmoratus marmoratus (Latreille 1800) du Parc National de Peneda Gerês (Portugal) par squelettochronologie

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Individual age of 193 Triturus marmoratus has been assessed by skeletochronology using cross sections of humeral shafts. The sample comes from five breeding localities at various elevations in the Peneda-Geres National Park (North Portugal). Our data confirm that the biology of this species and notably its longevity which can reach at least 15 years in natura in north Portugal, is highly linked to local climate conditions. Histological analysis of skeletal growth marks demonstrates that the older individuals lived in the higher stations. Histological data also allow an assessment of age at the first breeding season which in this sample is most commonly at five years. Finally we offer an explanation for the numerous dividing growth lines most often found in the high altitude specimens as a record of a second slow growing period which at high elevation occurs each year during summer.

Affiliations: 1: Centro de fauna da Universidade de Lisboa. Faculdade de Ciencias de Lisboa. Rua da Escola Politec-nica. 1200 Lisboa. Portugal; 2: Laboratoire d'Anatomie Comparée. Equipe de Recherche «Formations squelettiques». Université Paris 7, 2 place Jussieu 75251 Paris cedex 05 France


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