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Developmental Differences Between Social And Solitary Spiders: Why Do Social But Not Solitary Huntsman Spiders Have An Extra Non-Feeding Instar?

Author
Cardillo, Marissa
Abstract
The physiological bases for major ontogenetic differences in developmental patterns of closely related social and solitary huntsman spiders (Sparassidae: Deleninae) were explored in two social and four solitary species. The three group-living huntsman spiders, D. cancerides, D. lapidicola and D. melanochelis, develop differently from all other known solitary Delenine spiders. The social species have a non-feeding 2nd instar, while solitary huntsman feed as 2nd instars. To determine the physiological basis of these differences, we compared egg size and clutch size; lipid, carbohydrate, and protein content of yolk; standard metabolic rate; and development time. Our results show that social species do spend a longer period of time as non-feeders and that they have larger eggs and maintain low metabolic rates during their non-feeding instars, which may enable the social spiderlings to remain non-feeding. We discuss the implications of developmental heterochrony on the evolution of sociality in spiders.
Date Issued
2015-08-17Subject
Spiders; Metabolism; Development
Committee Chair
Rayor,Linda Susan
Committee Member
Buchon,Nicolas S.; Gilbert,Cole
Degree Discipline
Entomology
Degree Name
M.S., Entomology
Degree Level
Master of Science
Type
dissertation or thesis