Evidence of Absence Training
The U.S. Geological Survey (USGS) has published Evidence of Absence (EoA), a user-friendly software application for estimating bird and bat fatalities at wind farms and for designing search protocols. The software is particularly useful in addressing whether the number of fatalities is below a given threshold and what search parameters are needed to give assurance that thresholds were not exceeded. The software also includes tools for estimating carcass persistence distributions and searcher efficiency parameters (p and k) from field trials, projecting future mortality based on past monitoring data, and exploring the potential consequences of various choices in the design of long-term incidental take permits for protected species. The software was designed specifically for cases where tolerance for mortality is low and carcass counts are small or even zero, but the tools also may be used for mortality estimates when carcass counts are large.
Evidence of Absence Training Module 1 - Introduction and Statistical Concepts
Evidence of Absence Training Module 2 - Data Input: Detection Parameters
Evidence of Absence Training Module 3 - Multiple Search Classes, Multiple Sites
Evidence of Absence Training Module 4 - Long-term Monitoring and Decision Tools