Rebekah L. Ewing

US Fish and Wildlife Service, 520 Federal Hatchery Rd, Erwin, TN 37650

Comparing Naïve Occupancy Versus Modeled Occupancy to Monitor Declines in Rare Species

SEAFWA Journal Volume 11, March 2024

Monitoring changes in occupancy (i.e., probability a site has at least one individual of a species) across time is considered an inexpensive alternative to monitoring changes in abundance and can be used to monitor multiple species simultaneously across a watershed. Occupancy can be measured as the proportion of sites where a species is detected during surveys (i.e., naïve occupancy), but is more commonly modeled by surveying sites multiple times to estimate detection probability and address false-positive survey errors (sites that are occupied but with no survey detections of the species...