Planet of Birds

Double-crested Cormorant (Phalacrocorax auritus) Science Article 15 abstract The ability to determine the age of birds accurately from their skeletons would be useful not only for population biology and wildlife management research but for avian palaeontological and archaeological analyses as well. While accurate osteologically based age determination techniques are available for some amphibians and reptiles […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 16 abstract Double-crested Cormorants (Phalacmcorax avril us) are normally considered a diurnal species. Herewe describe cormorants foraging nocturnally in an oxbow lake in Mississippi. We have observed this behavior onlyonce during 30 capture attempts over seven years. D. Tommy King, J. Brent Harrf, Brian Dorr and David Reinhoid, Colonial […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 9 abstract Kleptoparasitism, or the stealing of resources, has been observed within and betweenmany bird species (Brockmann and Barnard 1979, Furness and Monaghan 1987).Although the kleptoparasite sometimes steals food without aggression towards the host,the host may be threatened or even attacked (Brockmann and Barnard 1979). In thisnote, I report […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 2 abstract In the early 1970s, censuses of Double-crested Cormorants Phalacrocorax auritus albociliatus on Isla Alcatraz in the Gulf of California suggested that Isla Alcatraz was one of the largest Double-crested Cormorant nesting colonies in the Gulf. To update information on the size of the colony, we counted active […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 14 abstract The Double-crested Cormorant (Phalacrocorax auritus) is a common inhabitant of most water bodies in Florida (Hatch and Weseloh 1999). Cormorants are primarily piscivorous(Nettleship and Duffy 1995). While most studies have examined the impact of cormorant predation on fish, other prey items noted include crayfish and salamanders (Derby […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 4 abstract The Double-crested Cormorant Phalacrocorax auritus has been protected by the Migratory Bird Treaty Act since 1972, as a result of a bilateral treaty with Mexico. Since that time, the U.S. Fish and Wildlife Service has had authority for cormorant management and conservation. From the late 1970s to […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 5 abstract Double-crested Cormorants Phalacrocorax auritus (hereafter cormorants) first nested in Lake Erie in the mid 1900s and have established numerous successful nesting colonies. Concerns by commercial and recreational fishermen about potential negative effects of this piscivorous species on populations of fishes in Lake Erie, especially walleyes Sander vitreus, […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 1 abstract We examined spatial and temporal foraging patterns of Caspian terns and double-crested cormorants nesting in the ColumbiaRiver estuary, to potentially identify circumstances where juvenile salmonids listed under the U.S. Endangered Species Act mightbe more vulnerable to predation by these avian piscivores. Data were collected during the 1998 […]