Often abundance of rare species cannot be estimated with conventional design-based methods, so we illustrate with a population of blue whales (Balaenoptera musculus) a spatial model-based method to estimate abundance. We analyzed data from line-transect surveys of blue whales off the coast of Chile, where the population was hunted to low levels. Field protocols allowed deviation from planned tr...

Monitoring wildlife abundance across space and time is an essential task to study their population dynamics inform effective management. Acoustic recording units are a promising technology for efficiently monitoring bird populations communities. We present integrated modeling framework that combines high-quality but temporally sparse point count survey data with acoustic recordings. Using simul...

The habitat and occurrence of farmland birds are strongly determined by the agricultural-landscape structure. Changes in land cover composition configuration one main causes significant decline abundance Eurasian skylark (Alauda arvensis) recent decades. This farmland-bird species is common agricultural areas Eurasia. In this study we investigate use factors involved Central Europe, Hungary. We...