Population size of Island loggerhead shrikes on Santa Rosa and Santa Cruz Islands
Stanley TR, Teel S, Dye LC, Hall L, Laughrin LL. 2012. Population size of Island loggerhead shrikes on Santa Rosa and Santa Cruz Islands. Wildlife Society Bulletin. 36(1):61-69
Island loggerhead shrikes ( Lanius ludovicianus anthonyi) are an endemic, genetically distinct subspecies of loggerhead shrike on California's Santa Rosa, Santa Cruz, and Santa Catalina Islands (USA). This subspecies is listed as a Species of Special Concern by the California Department of Fish and Game. During the 2009 and 2010 breeding seasons, we surveyed sample units on ... using a double-observer method with independent observers to estimate joint detection probabilities ( p), where we selected units under a stratified random sampling design. We estimated shrike abundance....These numbers, especially for Santa Rosa Island, are higher than previously reported but nevertheless are still low. Rapid vegetation change on both islands due to recent removal of nonnative herbivores may threaten the habitat and status of this subspecies and, therefore, we suggest that intensive demographic and habitat use research be initiated immediately.
- Type
- Journal Article
- Authors
- Stanley, Thomas; Teel, Susan; Dye, Linda; Hall, Linnea; Laughrin, Lyndal
- Units
- CHIS
- Keywords
- Lanius ludovicianus anthonyi, population estimation, Santa Cruz Island, Santa Rosa Island, Island loggerhead shrike