Movements, activity patterns and habitat use of Boiga irregularis (Colubridae), an introduced predator in the island of Guam
AdvisorMaughan, O. Eugene
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PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractBoiga irregularis has caused the extinction of several native vertebrate species on the island of Guam. Information on movement is critical to the management of the species. B. irregularis is active at night and spends daylight hours in secluded refuges (from 10 m up in the forest canopy to 1 m underground). There appears to be no preferences for any particular refuge type. Nighttime movement (distance) was related to distances between daytime refugia. The average net movement ranged from 26.9-97.7 m/day (N = 11). The maximum distance moved from the first daytime location following release to subsequent locations ranged from 142.8-1809.4 m. The activity area (minimum convex polygon) ranged from 1.9-99 ha; the cumulative activity area periodically increased and did not reach an asymptote. Direction of snake movements were random. The data suggest that Boiga lacks a defined activity area, and moves randomly and continuously searching for resources.
Degree ProgramGraduate College
Renewable natural resources