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1 August 2003 THE EFFECTS OF SIZE, SEX, AND REPRODUCTIVE CONDITION ON THERMAL AND DESICCATION STRESS IN A RIPARIAN SPIDER (PIRATA SEDENTARIUS, ARANEAE, LYCOSIDAE)
Jill DeVito, Daniel R. Formanowicz
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Abstract

Within a species, physiological tolerances and thermoregulatory behaviors may vary among ontogenetic stages or between sexes. Such different tolerances can strongly affect the ecology and life history of a species. In a laboratory study, we tested the hypothesis that Pirata sedentarius Montgomery 1904 is differentially susceptible to thermal/desiccation stress by size and sex. As predicted, male adults were more susceptible to thermal/desiccation stress than females. Unexpectedly, however, juvenile spiders survived longer under thermal/desiccation stress than adults. Furthermore, female adults without egg sacs displayed a trend toward higher thermal/desiccation tolerance than females carrying egg sacs. These results suggest that for P. sedentarius, microhabitat preferences and/or thermoregulatory behaviors may change over the course of development, and may vary between sexes and between females with and without egg sacs.

Jill DeVito and Daniel R. Formanowicz "THE EFFECTS OF SIZE, SEX, AND REPRODUCTIVE CONDITION ON THERMAL AND DESICCATION STRESS IN A RIPARIAN SPIDER (PIRATA SEDENTARIUS, ARANEAE, LYCOSIDAE)," The Journal of Arachnology 31(2), 278-284, (1 August 2003). https://doi.org/10.1636/02-20
Received: 22 April 2002; Published: 1 August 2003
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KEYWORDS
Microhabitat partitioning
ontogenetic changes in physiological tolerances
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