We summarize results of a November 2006 workshop dealing with recent research on the
estimation of landbird abundance from count data. Our conceptual framework includes a …

Most capture–recapture studies are inherently spatial in nature, with capture probabilities
depending on the location of traps relative to animals. The spatial component of the studies …

Indices to population size have come under increasing criticism in recent years, on the
grounds that indices might not faithfully represent the entire population. Most criticisms …

Inferences based on counts adjusted for detectability represent a marked improvement over
unadjusted counts, which provide no information about true population density and rely on …

We have developed a system for simulating the conditions of avian surveys in which birds
are identified by sound. The system uses a laptop computer to control a set of amplified MP3 …

Imperfect detection during animal surveys biases estimates of abundance and can lead to
improper conclusions regarding distribution and population trends. developed a combined …

Increasing impacts of climatic change and anthropogenic disturbances on natural
ecosystems are leading to population declines or extinctions of many species worldwide. In …

Simple Summary The Himalayan pheasants have many cultural, economic, and
environmental values. Still, unfortunately, the species is under anthropogenic pressure and …

Vessel-based transects have been a mainstay of seabird research for decades, yet there
has been surprisingly little effort to evaluate the detectability of seabirds within strip …

Probability of detection and accuracy of distance estimates in aural avian surveys may be
affected by the presence of anthropogenic noise, and this may lead to inaccurate …