UBC Research Data

Data from: The shortfall of sociality: group-living affects hunting performance of individual social spiders Harwood, Gyan; Avilés, Leticia


<b>Abstract</b><br/>Ineffective hunters in cooperative foraging groups may be shielded from natural selection by their more effective group mates, whereas those living solitarily would starve and thus be removed from the population. The problem may be exacerbated in large groups where it may be easier for individuals to withhold participation. Group foragers may thus be ineffective individual hunters or exhibit greater inter-individual variation in hunting abilities, in particular when living in large groups. We test these hypotheses in spider species of the genus Anelosimus that differ in their level of sociality and, among social species, in colonies of different sizes. We found that individuals from the more social species, and those from larger groups, reacted more slowly to prey than those from solitary species or small groups. Individuals from these categories also had greater inter-individual variation in reaction times. Individuals from large social groups also had lower prey capture success than those from small ones. These differences may have been driven by the size of the group from which the social individuals were taken, as those from small colonies behaved similarly to individuals of the two less social species. This finding suggests that hunting ability may develop as a phenotypically plastic trait.; <b>Usage notes</b><br /><div class="o-metadata__file-usage-entry"><h4 class="o-heading__level3-file-title">Individual hunt data - summarized</h4><div class="o-metadata__file-description">Demographic and prey capture data on each spider tested. Data include female size, colony size and population, average web volume and average capture rate over three feeding trials.</div><div class="o-metadata__file-name"></div></div><div class="o-metadata__file-usage-entry"><h4 class="o-heading__level3-file-title">Individual hunt data - trial data</h4><div class="o-metadata__file-description">Trial data for each of the 3 trials that each spider was subjected to. Data include reaction times, outcomes, and size of webbing.</div><div class="o-metadata__file-name"></div></div>

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