Habitat use and movement of the endangered Arroyo Toad (Anaxyrus californicus) in coastal southern California

Journal of Herpetology
By: , and 

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Abstract

Information on the habitat use and movement patterns of Arroyo Toads (Anaxyrus californicus) is limited. The temporal and spatial characteristics of terrestrial habitat use, especially as it relates to upland use in coastal areas of the species' range, are poorly understood. We present analyses of radiotelemetry data from 40 individual adult toads tracked at a single site in coastal southern California from March through November of 2004. We quantify adult Arroyo Toad habitat use and movements and interpret results in the context of their life history. We show concentrated activity by both male and female toads along stream terraces during and after breeding, and, although our fall sample size is low, the continued presence of adult toads in the floodplain through the late fall. Adult toads used open sandy flats with sparse vegetation. Home-range size and movement frequency varied as a function of body mass. Observed spatial patterns of movement and habitat use both during and outside of the breeding period as well as available climatological data suggest that overwintering of toads in floodplain habitats of near-coastal areas of southern California may be more common than previously considered. If adult toads are not migrating out of the floodplain at the close of the breeding season but instead overwinter on stream terraces in near-coastal areas, then current management practices that assume toad absence from floodplain habitats may be leaving adult toads over-wintering on stream terraces vulnerable to human disturbance during a time of year when Arroyo Toad mortality is potentially highest.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Habitat use and movement of the endangered Arroyo Toad (Anaxyrus californicus) in coastal southern California
Series title Journal of Herpetology
DOI 10.1670/10-160.1
Volume 45
Issue 3
Year Published 2011
Language English
Publisher The Society for the Study of Amphibians and Reptiles
Contributing office(s) Western Ecological Research Center
Description 10 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Herpetology
First page 319
Last page 328
Country United States
State California