Double-crested Cormorant (Phalacrocorax auritus) Science Article 10 abstract The breeding colony of the Double-crested Cormorant (Phalacrocorax auritus) on East Sand Island in the Columbia River estuary has grown dramatically over the last 13 years, in contrast to declines at other colonies along the coast of the Pacific Northwest. Immigration from other colonies has occurred and […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 17 abstract The nesting colony of Double-crested Cormorants, Phalacrocorax auritus (Lesson, 1831), on East Sand Island in the Columbia River estuary is currently the largest for this species on the Pacific Coast of North America. We used radiotelemetry to investigate the spatial and temporal foraging patterns of nesting cormorants […]

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 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 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 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 11 abstract Much is made of the many non-market values contributed by wildlife and the many forms of wildlife dependent recreation. However, sometimes lost in the discussion of wildlife values and the importance of wildlife are the market and non-market costs resulting from wildlife damages to human enterprises. Often […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 6 abstract Outbreaks of morbidity and mortality in double-crested cormorants (Phalacrocorax auritus) along Florida’s Gulf Coast have occurred sporadically for at least 30 yr. During these outbreaks, the Clinic for the Rehabilitation of Wildlife, located on Sanibel Island in Florida, has admitted a substantial number of cormorants with consistent […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 7 abstract Cloacal and pharyngeal swabs from 100 tree-nesting Double-crested cormorant (DCC) chickswere examined by culture for commensal and potentially pathogenic bacteria. No Salmonella or Erysipelothrix were isolated from the cloacal swabs. Twenty-two cloacal swabs were positive for Campylobacter, of which 14 were C. jejuni, C. coli, and 1 […]

Double-crested Cormorant (Phalacrocorax auritus) Science Article 8 abstract In North America, the Double-crested Cormorant (Phalacrocorax auritus) is currently abundant, widely distributed across five broad geographic regions, and often perceived as overabundant. In many U.S. states and Canadian provinces, policy makers are pressured to significantly reduce cormorant numbers, primarily to minimize conflicts between cormorants and fish […]