Double-crested Cormorant (Phalacrocorax auritus) Science Article 12 abstract During the summer of 1998, the New York State Department of Environmental Conservation (NYSDEC) and the United States Geological Survey (USGS) conducted 11 studies designed to evaluate the impact of double-crested cormorant predation on smallmouth bass and other fish populations in the New York waters of the […]
A KLEPTOPARASITIC ATTACK ON A DOUBLE-CRESTED CORMORANTBY A BROWN PELICAN
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 […]
Foraging Patterns of Caspian Terns and Double-crested Cormorants inthe Columbia River Estuary
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 […]
Predation on walleyes Sander vitreus by Double-crested Cormorants Phalacrocorax auritus at the West Sister Island colony in 2005
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, […]
Resolving Double-crested Cormorant Phalacrocorax auritus conflictsin the United States: past, present, and future
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 ATTEMPTING TO EAT A BIRD
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 […]
ASSESSMENT OF THE NESTING POPULATION OF DOUBLE-CRESTED CORMORANTS PHALACROCORAX AURITUS ALBOCILIATUS ON ISLA ALCATRAZ, GULF OF CALIFORNIA, MEXICO
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 […]
SEXUAL ROLES IN THE DOT-WINGED ANTWREN (MICRORHOPIAS QUIXENSIS), A TROPICAL FOREST PASSERINE
Dot-winged Antwren (Microrhopias quixensis) Science Article 1 abstract Dot-winged Antwrens maintain long-term pair bonds on year-long territories in tropical forests and woodland of Central and South America. Pairs partition breeding-related activities nearly equally. Like other antbirds (Formicariidae), both sexes incubate and brood. Both sexes participate equally in territorial maintenance behavior, which primarily involves active border […]
COOPERATIVE ROLES IN MIXED FLOCKS OF ANTWRENS (FORMICARIIDae)
Dot-winged Antwren (Microrhopias quixensis) Science Article 2 abstract Under certain conditions, flocking might enhance the foraging efficiencies of some or all the participating in- dividuals. For instance, individuals might capture insects flushed by other members of the flock (Swynnerton, 1915; Brosset, 1969), or flocks might exploit patches of abundant food more efficiently than solitary individuals […]
Habitat Use and Resource Overlap by Breeding Golden Ploversand Dotterels (Pluvialis apricaria, Charadrius morinellus)
Dotterel (Charadrius morinellus) Science Article 1 abstract This study describes their habitat use and resource overlap in an area of co-occur-rence in southern Norway, and analyzes their population densities, and aggression inrelation to predictions from the competitive exclusion principle. Ingvar Byrkjedal, J. Orn. 130, 1989: S. 197-206 Download article download full text (pdf)