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Influence des facteurs environnementaux sur le comportement de fourragement chez le rat : structure physique et disponibilité en nourriture

Abstract : According to the Optimal Foraging Theory an animal is expected to enter into a given activity depending on associated costs and benefits. Numerous studies have suggested that energetic reward is balanced by predation risk in foraging decisions. Therefore, the use of information about indirect cues of predation risk such as physical structure (e.g. cover) can give individuals a selective advantage. We studied foraging behaviour in the laboratory rat in an experimental maze; it allowed us to vary two environmental parameters: food availability and physical structure. In a first experiment rats were offered a choice between two areas only differing in cover density. In a second experiment the two areas only differed in food density. In a third experiment we crossed both parameters. Results showed that high "cover" patch was preferentially exploited (exp. 1) and that rats foraged more in the high food density patch (exp. 2). The last experiment showed that rats partially trade-off between cover density and food availability. Therefore, we suggest that foraging decisions depend primarily on safety needs, rather than food availability, at least when animals are not severely food-deprived.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2003_0225_ARCIS.pdf
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https://hal.univ-lorraine.fr/tel-01746780
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Submitted on : Thursday, March 29, 2018 - 10:44:44 AM
Last modification on : Thursday, September 24, 2020 - 11:52:32 AM

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Vincent Arcis. Influence des facteurs environnementaux sur le comportement de fourragement chez le rat : structure physique et disponibilité en nourriture. Neurosciences [q-bio.NC]. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10225⟩. ⟨tel-01746780⟩

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