Planet of Birds

Double-crested Cormorant (Phalacrocorax auritus) Science Article 13 abstract For many years the Double-crested Cormorant (Phalacrocorax auritus) has been suspectedof nesting in South Carolina. Wayne (Birds of South Carolina, 1910, p. 12) saw Double-crested Cormorants on the coast during the summer, and he believed that they bred, WILLIAM POST and COLIN A. POST, The Chat Vol. […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 3 abstract Diving endotherms inhabiting polar regions face potentially high thermoregulatory costs. Unless properly insulated, these animals will lose vast amounts of heat when diving in cold water, which has to be balanced by heat production. Heat generated as a by-product of digestion (heat increment of feeding, HIF) or […]

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 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 […]