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Les mécanismes de la coopération chez les Arthropodes sociaux : étude de la prédation chez une araignée sociale "Anelosimus eximius" ("Araneae,Theridiidae)

Abstract : Predation in a social species of spider, Anelosimus eximius, is characterised by 3 steps: during the first spiders are recruited, thus it capture and finally transport the prey. The organisation observed during capture and transport is explained by a coordination of individual acts that results of an adjustment of their behaviours to the state of the prey and to its environment (stimergic process). This is confirmed by computer simulation. The regulation of the number of individuals participating in every stage of the predation is also explained by auto-organisation phenomena. It is the prey features (vibrations, weight and size) that regulate the individual involvement. The nutritional status of individuals is also involved in this regulation. Small spiders are more active than large one. Thus, cooperation during predation emerges from group living and doesn't require sophisticated communication mechanisms between individuals. It permits to understand better how the passage from solitary to social species has been realised without important modifications of individual behaviours.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2002_0025_VAKANAS.pdf
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Submitted on : Thursday, March 29, 2018 - 10:42:54 AM
Last modification on : Thursday, October 15, 2020 - 11:59:09 AM

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Guillaume Vakanas. Les mécanismes de la coopération chez les Arthropodes sociaux : étude de la prédation chez une araignée sociale "Anelosimus eximius" ("Araneae,Theridiidae). Autre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10025⟩. ⟨tel-01746699⟩

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