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Data from: There’s no place like home: the contribution of direct and extended phenotypes on the expression of spider aggressiveness
Montiglio, Pierre-Olivier; DiRienzo, Nicholas — 2016-05-27 Architectural constructions allow animals to modify their environment in order to improve their reproductive success. Constructions also modulate the expression of individual behavior, ultimately affecting the presence and importance of animal personality within populations. The exact impact of constructions on personality is seldom investigated. We quantified experimentally the impact of web characteristics on individual foraging behavior in the Western black widow spider (Latrodectus hesperus). We assayed aggressiveness toward a prey cue, and boldness while individuals resided on their own web versus after being translocated onto webs built by con-specifics. We quantified the importance of individual differences in aggressiveness and boldness while accounting for differences in web characteristics. We tested for relationships between web building, aggressiveness, and boldness. Web characteristics affected spider aggressiveness and interacted with individual web-building behavior to explain up to a fifth of the variation in foraging aggression, but did not affect spider boldness. Even after accounting for web characteristics, individuals still exhibited important differences in aggressiveness. We detected no relationship between an individual’s aggressiveness behavioral type and the characteristics of the web it built. Surprisingly, web characteristics impacted aggressiveness differently from one individual to the next. Hence the effect of web characteristics on foraging behavior might depend on condition or past experience. Webs contributed mostly to the variation in aggressiveness within-individuals. Variation in web building behavior might affect the amount of consistent differences in foraging, mating, and anti-predator behavior among individuals and needs to be accounted for when quantifying individual variation in behavior in spiders.
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Data from: Social selection acts on behavior and body mass but does not contribute to the total selection differential in Eastern chipmunks
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Santostefano, Francesca; Garant, Dany; Bergeron, Patrick; Montiglio, Pierre-Olivier; Réale, Denis — 2019-11-04 <p>Through social interactions, phenotypes of conspecifics can affect an individual’s fitness, resulting in social selection. Social selection is assumed to represent a strong and dynamic evolutionary force that can act with or in opposition to natural selection. Few studies, however, have estimated social selection and its contribution to total selection in the wild. We estimated natural and social selection gradients on exploration, docility, and body mass, and their contribution to selection differentials, in a wild Eastern chipmunk population (<i>Tamias striatus</i>). We applied trait-based multiple regression models derived from classical phenotypic selection analyses, which allowed us to include several social partners (i.e., neighbors). We detected social selection gradients on female docility and male body mass, indicating that female with docile neighbors and males with large neighbors had lower fitness. In both sexes, social selection gradients varied with the season. However, we found no phenotypic assortment or disassortment for the studied traits. Social selection gradients, therefore, did not contribute to total selection differentials, and natural selection alone could drive phenotypic changes. Evaluating the factors that drive the evolution of the covariance between interacting phenotypes is necessary to understand the role of social selection as an evolutionary force. </p>
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Resource availability, competition, and the web structure of western black widows
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Montiglio, Pierre-Olivier; Toupin, Louis-Philippe; Ratz, Tom — 2022-08-03 <p>This dataset originates from an experiment using black widow spiders (Latrodectus hesperus) originally collected from Davis, California, United-States and brought to the University of Arizona, where they were maintained under laboratory condition for 12 months. Spiders were then transferred to Pierre-Olivier Montiglio's laboratory in Montreal in Canada, where they were kept for a month prior to the experiment. During this time, spiders were housed in individual plastic containers (946 ml) at 23˚C ± 1.50 and 25 % humidity ± 8.94 with a photoperiod of 12h, and fed a single live house cricket (Acheta domesticus) every two weeks.</p> <p>Spiders were then fed for 8 weeks either a cricket every three weeks (Restricted treatment), a cricket every two weeks (Intermediate treatment), or a cricket every week (Ad libitum treatment) for 8 weeks. Each spider experienced each of the three food treatments in an order that was randomly determined. At the end of each 8-week food treatment, spiders were left to weave a web for a week in an individual standardized cardboard frame (31 x 17 x 24 cm). For each session of web construction, we monitored the structure of the web (i.e., proportion of structural threads over trap threads), body weight loss, and web weight. See Toupin et al. 2022 in Behavioral Ecology for further information on the data and the experiment.</p> <p>The experiment was designed and conducted by Louis-Philippe Toupin and Pierre-Olivier Montiglio. The data were organized and formatted for Dryad by Pierre-Olivier Montiglio.</p>

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(auteur : Montiglio, Pierre-Olivier)

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