Costs of refuge use affect escape decisions of Iberian rock lizards Lacerta monticola

Citation
J. Martin et P. Lopez, Costs of refuge use affect escape decisions of Iberian rock lizards Lacerta monticola, ETHOLOGY, 106(6), 2000, pp. 483-492
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ETHOLOGY
ISSN journal
0179-1613 → ACNP
Volume
106
Issue
6
Year of publication
2000
Pages
483 - 492
Database
ISI
SICI code
0179-1613(200006)106:6<483:CORUAE>2.0.ZU;2-V
Abstract
Theoretical models of anti-predator escape behaviour suggest that prey may adjust their escape response such that the optimal flight distance is the p oint at which the costs of staying exceed the costs of fleeing. Anti-predat ory decisions should be made based also on consequences for long-term expec ted fitness, such as the costs of refuge use. For example, in lizards, the maintenance of an optimal body temperature is essential to maximize physiol ogical processes. However, if unfavourable thermal conditions of refuges ca n decrease the body temperature of lizards, their escape decision should be influenced by refuge conditions. Analyses of the variation in flight dista nces and emergence latency from a refuge for the lizard Lacerta monticola u nder two different predation risk levels, and their relationship with the t hermal environment, supported these predictions. When risk increased, lizar ds had longer emergence latencies, and thus costs of refuge use increased ( a greater loss of time and body temperature). In the low-risk situation, li zards that were farther from the refuge had longer flight distances, wherea s thermal conditions were less important. When risk increased, lizards had longer flight distances when refuges were farther off, but also when the ex ternal heating rate and the refuge cooling rate were lower. The results sug gest that, in addition to the risk of predation, expected long-term fitness costs of refuges can also affect escape decisions.