LAND USE IMPACTS ON MOVEMENT PATTERNS OF CALIFORNIA TIGER SALAMANDERS (AMBYSTOMA CALIFORNIENSE) IN A VERNAL POOL COMPLEX

Victoria L Brunal-Byrd; Sonoma State University; brunalvictoria@gmail.com; Dave Cook, Alessandra Phelan-Roberts, Leslie Rivas, Daniel Crocker, Derek Girman

Seasonal migration between terrestrial upland habitat and vernal pools, is a critical life history component for the endangered Sonoma County California Tiger Salamander (CTS- Ambystoma californiense). To better understand migratory movements associated with classic clustered vernal pool habitat surrounded by varying land uses, we employed a two-year pitfall trapping study of adult CTS. Pitfall traps and drift fences were installed around four pools on a preserve in Santa Rosa, CA. Using a non-invasive individual identification system, we investigated orientation of individual adult salamanders leaving their breeding pools, influences of surrounding land use on movement, and levels of among-pool movement. We found that individuals moved non-randomly, maintaining a relatively consistent direction toward original entry points when exiting. Furthermore, the direction between entry and exits was significantly affected by surrounding land use; individual entries associated with rural residences tended to stray further, relative to entries associated with preserve and cattle grazed preserve. Within a breeding season, only a small proportion of individuals visited a second pool; however, by far, most individuals visited only one pool despite the high density of clustered pools available.

Ecology and Conservation of Amphibians and Reptiles - III