Journal
HORMONES AND BEHAVIOR
Volume 60, Issue 5, Pages 478-483Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.yhbeh.2011.07.015
Keywords
Octopamine; Flight; Costs; Reproduction; Orthoptera; Insect; Invertebrate
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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Many of the deleterious effects of chronic stress in vertebrates are caused by the long-term elevation of stress hormones. These negative effects are thought to be unavoidable by-products of sustained activation of the stress response, but the details remain unclear. A comparative perspective may help in understanding chronic stress. We exposed crickets (Gryllus texensis) to a mock predator. A single exposure to a mock predator induced a transient increase in the hemolymph (blood) concentration of the insect stress neurohormone, octopamine. Repeated exposure to the mock predator increased basal levels of octopamine, similar to the effects of chronic stress on the basal levels of vertebrate stress hormones. This study is the first to report an increase in the basal levels of an invertebrate stress hormone in response to repeated flight-or-fight stress. Chronic stress reduced weight gain, and decreased feeding and enhanced weight loss after food deprivation in adult female crickets. However, chronic stress also increased the tendency of crickets to produce sustained flight. Therefore, this study supports the hypothesis that increasing basal levels of stress hormones may be a phylogenetically common response to chronically stressful conditions. It also demonstrates that chronic stress has both positive and negative effects in insects. (C) 2011 Elsevier Inc. All rights reserved.
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