Decline in surf scoter (Melanitta perspicillata) waterfowl populations wintering in the Chesapeake Bay has been associated with changes in the availability of benthic bivalves. The Bay has become more eutrophic, causing changes in the benthos available to surf scoters. The subsequent decline in oyster beds (Crassostrea virginica) has reduced the hard substrate needed by the hooked mussel (Ischa...

Common loons Gavia immer are a conservation concern in New England due to a variety of anthropogenic factors, yet little is known about biotic and abiotic environmental factors determining their wintering distribution and abundance in nearshore and offshore waters. The primary objective of this study was to develop a spatially explicit abundance model of wintering common loons in the maritime w...

At present, about 160,000 and 100,000 cranes are migrating on the West-European and on the Baltic-Hungarian routes, respectively, from the northern, middle, and northeastern parts of Europe. On both routes, the resting maxima, simultaneously determined since the 1980’s, has increased three-fold. This increase in migratory cranes is the result of shorter migration routes with higher return rates...

Wintering site selection is a major decision in bird’s annual life cycle since conditions experienced by individuals within wintering can influence individual fitness and ultimately population dynamics. If show strong fidelity to specific sites, environmental effects be reinforced. In this study we analyse winter resightings of ringed Dalmatian pelicans, collected during 35-year-long ringing su...

Background and objective: Fragmentation of river ecosystems is expected to affect biodiversity loss, but bridge construction proceeding without consideration in urban areas. This study was conducted determine the effect internal environmental factors ecosystem fragmentation caused by on population wintering whooper swans (Cygnus cygnus) Nakdong River Busan Metropolitan City, a key site for swan...

In order to describe the influence of Pleistocene glaciations on the genetic structure and demography of a highly mobile, but specialized, passerine, the Savi's Warbler (Locustella luscinioides), mitochondrial DNA sequences (ND2) and microsatellites were analysed in c.330 individuals of 17 breeding and two wintering populations. Phylogenetic, population genetics and coalescent methods were used...

EFFECTS OF PRESCRIBED FIRE ON WINTERING, BARK-FORAGING BIRDS IN NORTHERN ARIZONA