AI Article Synopsis

  • Animals respond to stress using intrinsic and extrinsic factors, and this study focused on wild dice snakes to analyze stress response variations across sexes, morphotypes, reproductive status, and feeding behavior.
  • After capture, both glucose (GLUC) and corticosterone (CORT) levels rose sharply, with GLUC peaking sooner than CORT, indicating a significant stress response that remained high over time.
  • Surprisingly, no differences were found across sex or morphotype, but snakes exhibiting death-feigning behavior had lower CORT levels, suggesting that low stress hormones may help facilitate this behavior, while those with partially digested food showed higher GLUC levels.

Article Abstract

AbstractTheoretically, animals integrate intrinsic and extrinsic factors to respond appropriately to the wide range of stressors they encounter during their life span. We examined how stress response varies between sexes and among morphotypes in wild dice snakes (). We also considered reproductive and feeding status and antipredator behavior. We used two indicators of stress (glucose [GLUC] and corticosterone [CORT] levels) at eight sampling time intervals (immediately after capture, up to 17 h after) and a large sample size ( snakes). Concentrations of both markers increased sharply after capture (an equivalent of predation). This acute phase occurred earlier for GLUC (30 min) compared to CORT (60 min). Then the values plateaued to very high levels without decline over time, indicating prolonged saturation of the hypothalamus-pituitary-adrenal axis. In contrast to our expectations, we found no effect of sex, morphotype, or reproductive status. Yet the CORT stress response of those individuals displaying death-feigning (DF) antipredator behavior was attenuated compared to those that did not. Low stress hormones levels may facilitate the expression of DF (high levels supporting fleeing behavior). The presence of partially digested material in the stomach was associated with higher blood GLUC during the plateau. Assaying blood GLUC requires very little blood but was as good as CORT at gauging acute stress response. The prolonged plateau suggests that captivity should be minimized during field studies.

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http://dx.doi.org/10.1086/711958DOI Listing

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