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Université de Fribourg

Mark-recapture Estimates of Survival in Populations of the Asp Viper, Vipera aspis aspis

Flatt, Thomas ; Dummermuth, Stefan ; Anholt, Bradley R.

In: Journal of Herpetology, 1997, vol. 31, no. 4, p. 558-564

We estimated th eannual survivorship of two populations of the asp viper, Vipera aspis aspis, by recapturing known dult individuals in the field over six and nine years respectively. The snakes at the two study sites in th eJura mountains of northwestern Switzerland were active between mid-March and mid-October. Vispera a. aspis is easily captured by hand, has individually recognizable marks...

Consortium of Swiss Academic Libraries

Multistage density dependence in an amphibian

Altwegg, Res

In: Oecologia, 2003, vol. 136, no. 1, p. 46-50

Université de Fribourg

New material of Laophis crotaloides, an enigmatic giant snake from Greece, with an overview of the largest fossil European vipers

Georgalis, Georgios L. ; Szyndlar, Zbigniew ; Kear, Benjamin P. ; Delfino, Massimo

In: Swiss Journal of Geosciences, 2016, vol. 109, no. 1, p. 103–116

Laophis crotaloides was described by Richard Owen as a new and very large fossil viperid snake species from Greece. The type material is apparently lost and the taxon was mostly neglected for more than a century. We here describe a new partial viperid vertebra, collected from the same locality and of equivalent size to the type material. This vertebra indicates that at least one of the three...