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Potential Causes of Shedding Aggregations in Prairie Rattlesnakes.

Emily Martin1, Courtney J Conway2

  • 1Idaho Cooperative Fish and Wildlife Research Unit University of Idaho Moscow Idaho USA.

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Snakes undergoing ecdysis (the shedding of their skin) aggregate, but not for thermoregulation. This snake behavior may be linked to reproduction or environmental thermal conditions.

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Area of Science:

  • Animal behavior
  • Herpetology
  • Ecology

Background:

  • Animal aggregation is common and offers benefits like resource access and defense.
  • Snake aggregations are observed during hibernation, gestation, and parturition.
  • Aggregation during ecdysis (skin shedding) is poorly understood due to infrequent observations.

Purpose of the Study:

  • To investigate the reasons behind snake aggregation during ecdysis.
  • To test hypotheses explaining aggregation behavior in prairie rattlesnakes (Crotalus viridis).

Main Methods:

  • Documented aggregation behavior in a population of asynchronously shedding prairie rattlesnakes.
  • Tested predictions derived from four hypotheses: reproductive facilitation, thermal landscape, and improved thermal efficiency.

Main Results:

  • Prairie rattlesnakes were more likely to aggregate when undergoing ecdysis.
  • Data did not support the hypothesis that aggregation improves thermal efficiency.
  • Some support was found for the reproductive facilitation and thermal landscape hypotheses.

Conclusions:

  • Ecdysis is a significant factor driving aggregation in prairie rattlesnakes.
  • The behavior is unlikely related to thermoregulation.
  • Reproductive facilitation and thermal landscape factors may explain aggregation during ecdysis.