| Titre : | Habitat evolution and climatic changes: what are the consequences for the populations of Ocellated Lizard, Lacerta lepida (Sauria, Lacertidae), on the northern distribution limit? |
| Auteurs : | Pierre Grillet, Auteur ; Marc Cheylan, Auteur ; François Dusoulier, Auteur |
| Type de document : | Article |
| Dans : | Ecologia Mediterranea (32 2006) |
| Article en page(s) : | 63-72 |
| Résumé : | The French Mediterranean region provides an ideal situation to study distribution changes that may be related to climate change. At the northern limits of the Mediterranean region one would predict a northward migration of thermophilous species adapted to the Mediterranean climate. This prediction was tested on the Ocellated Lizard, Lacerta lepida, a species typical of open habitats in the western Mediterranean. The habitats of 10 populations situated near the northern limit of the species' distribution were studied using aerial photography. During the last 50 years an important loss of open habitats was noted as a result of woodland encroachment and loss of habitat to cultivation. This has led to the fragmentation and isolation of populations which may be the cause of their rapid decline. Our study shows that the evolution of the landscape due to the abandonment of extensive grazing (with subsequent tree re-colonisation or farming of formerly grazed parcels) plays a major role in the spatial dynamics of certain mediterranean animal species. In the case of the Ocellated Lizard the evolution of the landscape has caused a regression of populations at the northern limit of the species' distribution, hence the prediction extension due to climate change is not observed. |



