Reference : Foraging plasticity favours adaptation to new habitats in fire salamanders
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Life sciences : Environmental sciences & ecology
Life sciences : Zoology
Foraging plasticity favours adaptation to new habitats in fire salamanders
Manenti, Raoul [Università degli Studi di Milano, Milano, Italy > Dipartimento di Bioscienze > > >]
Denoël, Mathieu mailto [Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Biologie du comportement - Ethologie et psychologie animale >]
Ficetola, Gentile Francesco [Università degli Studi di Milano-Bicocca, Milano, Italy > Dipartimento di Scienze dell’Ambiente e del Territorio, e di Scienze della Terra > > >]
Animal Behaviour
Academic Press
Yes (verified by ORBi)
United Kingdom
[en] Amphibian ; Fire salamander ; Salamandra salamandra ; Cave ; Hypogeous ; Epigeous ; Underground environment ; Light ; Experience ; Foraging ; Phenotypic plasticity ; Local adaptation ; Video-tracking ; Movement ; Space use ; Micro-habitat ; Shelter use ; Predation ; Salamandridae ; Caudate
[en] Predators often show strong plasticity of optimal foraging strategies. A major difference in foraging strategies occurs between sit-and-wait and active predators. Models predict that the efficiency of these strategies is affected by environmental conditions, active predators being favoured when prey are scarce and their detection difficult. The shift between the two strategies may occur through both phenotypic plasticity and local adaptations. Larvae of the fire salamander, Salamandra salamandra, are typically stream-dwelling sit-and-wait predators, but some populations breed in caves. We evaluated whether local adaptations or phenotypic plasticity determine shifts in foraging strategy between stream and cave populations. The foraging behaviour of salamander larvae was evaluated under all combinations of three test conditions during trials: light versus darkness, prey presence versus absence and food deprived versus fed; larvae originated from caves and streams and were reared in epigeous photoperiod or in darkness. Observations and video tracking showed that salamander larvae modified their behaviour in response to environmental conditions. In the darkness, larvae showed higher average velocity and moved longer distances. Movements were higher in food-deprived larvae and in the presence of prey compared to fed larvae and prey absent conditions. Furthermore, larvae from cave populations showed higher behavioural plasticity than stream larvae, and better exploited the available space in test environments. Variation in foraging behaviour was strong, and involved complex interactions between plasticity and local adaptations. Larvae from cave populations showed higher behavioural plasticity, supporting the hypothesis that this trait may be important for the exploitation of novel environments, such as caves.
Applied and Fundamental FISH Research Center - AFFISH-RC
F.R.S.-FNRS - Fonds de la Recherche Scientifique ; Fonds Spéciaux de la Recherche - Université de Liège
Researchers ; Professionals
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