Seasonal patterns of body condition, hydration state, and activity of gila monsters (Heloderma suspectum) at a Sonoran desert site

Jon R. Davis, Dale Denardo

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Animals in nature use synergistic behavioral and physiological responses to cope with variation in resource availability. We used a combination of traditional tools (i.e., radiotelemetry, body-condition measurements, plasma osmometry, and direct observation) and contemporary techniques (i.e., implanted temperature loggers and portable ultrasonography) to identify seasonal patterns of body condition, hydration state, and surface activity of 16 free-living Gila Monsters during two active seasons. Despite seasonal drought each year, Gila Monster snoutvent length increased during the study; yet body mass, tail volume, and hydration state decreased. Generally, surface activity was associated with rainy periods, and males were significantly more active than females but only during the reproductive season. Our results indicate that Gila Monsters combine flexible behavioral patterns (i.e., the timing and duration of surface activity), resource storage and economical use, and tolerance of substantial physiological disturbance to endure seasonal resource limitations at a site in the Arizona-Upland subdivision of the Sonoran Desert.

Original languageEnglish (US)
Pages (from-to)83-93
Number of pages11
JournalJournal of Herpetology
Volume44
Issue number1
DOIs
StatePublished - Mar 1 2010

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Fingerprint Dive into the research topics of 'Seasonal patterns of body condition, hydration state, and activity of gila monsters (Heloderma suspectum) at a Sonoran desert site'. Together they form a unique fingerprint.

  • Cite this