Skip to Main content Skip to Navigation
Theses

Stratégies comportementales et modèle d'optimisation dynamique à horizon non fini : succession des constructions de toiles chez une araignée orbitèle "Zygiella X-Notata" (Clerck)

Abstract : This study aims to test the hypothesis that adult female spiders of the orb-weaving species Zygiella x-notata build their successive webs according to rules that allow them to maximise their fitness. A non invasive method was first set up to estimate the total capture thread length of a web. Short term web building dynamics could be then investigated. Our results showed that informations linked to capture events and to prey ingestion with a given web influence following web building. Long term web building dynamics was studied through a longitudinal study of spiders between their final moult and their first egg-laying. Cost and benefits of web-building behaviour had to be estimated before setting up a predictive model of web-building optimal strategy. Predictions of this model could then be matched with observed behaviour. Behavioural data suggest predation risk occurring during web building to be weak, and energetic expenditure to increase both with the amount of silk set up per web and with spider's body weight. Probability of prey catching -that is, energetic expected gains- increased together with web size. Both field and laboratory data showed that adult female spiders reduced their web building activity throughout their development. Results of the predictive model also suggest that when their body weight increased, optimal spiders should reduce their building activity. Furthermore, we could make the following hypothesis: selective pressures should remain weak over web-building behaviour during most of adult female spider's development. This could explain, at least partly, the great diversity of observed web-building behaviours.
Document type :
Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_2002_0233_VENNER.pdf
Complete list of metadatas

https://hal.univ-lorraine.fr/tel-01746717
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 10:43:14 AM
Last modification on : Monday, October 19, 2020 - 3:49:36 PM

Identifiers

  • HAL Id : tel-01746717, version 1

Collections

Citation

Samuel Venner. Stratégies comportementales et modèle d'optimisation dynamique à horizon non fini : succession des constructions de toiles chez une araignée orbitèle "Zygiella X-Notata" (Clerck). Biologie animale. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10233⟩. ⟨tel-01746717⟩

Share

Metrics

Record views

32