MCBCP Arroyo Toad Monitoring Results for 2006 with Multi-Year Trend Analysis. Data Summary

摘要

In 2003, the USGS implemented a new monitoring program for the endangered arroyo toad (Anaxyrus californicus) on Marine Corps Base Camp Pendleton (MCBCP). To address problems associated with large variations in adult toad activity, we employed a spatial and temporal monitoring approach to track arroyo toad breeding populations by documenting the presence of egg strings and larvae. We survey sites within three major watersheds up to four times per year to calculate and account for imperfect detection probabilities. We also conduct night surveys for adult toads, following a monitoring program initially implemented by Dan Holland in 1996. This report details results and analyses specific to the 2006 surveys, as well trends in occupancy, breeding and adult activity from 2003 to 2006.