title: The particularities of a remote islet shape the thermoregulatory profile of an endemic Mediterranean lizard.
abstract: Environmental temperatures considerably affect the reptilian ability for thermoregulation and harsh climatic conditions may impose a highly effective body temperature regulation to lizards. Such demanding conditions are more common to extreme mainland habitats (e.g. deserts or mountains). To the contrary, islands have more benign climate conditions thanks to the thermal buffering effect of the surrounding sea. However, this favorable effect may be eliminated in small size islets where the scarcity of thermal shelters and exposure to high winds create challenging conditions. Here we investigate the impact of a tough islet habitat on the thermoregulation of Podarcis levendis, a lacertid lizard endemic to two rocky islets in the north Cretan Sea, Greece. To evaluate the thermoregulatory effectiveness of P. levendis we measured operative and body temperatures in the field and the preferred body temperatures in the lab. Analyses of the thermal data revealed an accurate, precise, and effective thermoregulator, achieving very high thermoregulation values (E =0.91, de¯-db¯ =7.6). This high effectiveness comes to compensate living in an inhospitable habitat as the operative temperatures denote (de=7.79). Our findings, together with the limited published literature, suggested the lack of a general pattern for all insular lizards and indicated a possible deviation for islet habitats.
authors.affiliation: Section of Zoology and Marine Biology, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Ilissia 15784, Greece. Electronic address: ppafil@biol.uoa.gr.
authors.forename: Panayiotis
authors.initials: P
authors.lastname: Pafilis
authors.affiliation: Natural History Museum of Crete, University of Crete, Irakleio, Greece.
authors.forename: Petros
authors.initials: P
authors.lastname: Lymberakis
authors.affiliation: Section of Animal and Human Physiology, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Ilissia 15784, Greece.
authors.forename: Kostas
authors.initials: K
authors.lastname: Sagonas
authors.affiliation: Section of Animal and Human Physiology, Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Ilissia 15784, Greece.
authors.forename: Efstratios
authors.initials: E
authors.lastname: Valakos
mesh_terms: D000064:Acclimatization; D000818:Animals; D001522:Behavior, Animal; D001831:Body Temperature; D001833:Body Temperature Regulation; D017753:Ecosystem; D008116:Lizards / Q000502:physiology*; D008521:Mediterranean Islands; D013696:Temperature
keywords: Habitat quality; Islands; Lacertidae; Lizards; Thermal adaptation