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Topic: Double crested Cormorant

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The Rise of the Double-crested Cormorant on the Great Lakes: Winning the War Against Contaminants – Canadian Wildlife Service, Ontario Region The cormorant populations on Lakes Ontario and Erie and the Canadian portions of Lakes Huron and Superior are shown in (Figure 6 (41K gif). In 1994, the cormorant population of Lake Ontario decreased by 6%. The cormorant's invasion was successful, as their population increased steadily during the '30s and '40s (Figure 2: Cormorant numbers on the Great Lakes have increased dramatically since 1980(28K gif)). www.on.ec.gc.ca /wildlife/factsheets/fs_cormorants-e.html   (4968 words)

NatureWorks -Double-crested Cormorant The double-crested cormorant dives for fish and marine invertebrates from the water's surface. The double-crested cormorant breeds from the coast of Alaska and Nova Scotia south to Mexico and the Bahamas. The double-crested cormorant lives in brackish and freshwater habitats on lakes, rivers, swamps, bays and coasts. www.nhptv.org /natureworks/doublecorm.htm   (214 words)

Double-crested Cormorant - Wikipedia, the free encyclopedia Double-crested Cormorants eat other species of fish besides alewives and have been implicated in the decline of some important sport-fish populations in the Great Lakes and other areas. The Double-crested Cormorant, Phalacrocorax auritus, is a North American member of the cormorant family of seabirds. The white double head crest is seen for a short period during the breeding season in western birds. en.wikipedia.org /wiki/Double-crested_Cormorant   (760 words)

Cormorant Oklahoma’s numerous reservoirs and abundant fish populations are an eye-opening treat to upwards of 50,000 cormorants migrating to and from breeding grounds during spring and fall. Cormorants are water-loving birds that choose nesting and roosting habitats safe from ground predators but close to feeding areas. Cormorants fly in the shape of a “V” just like geese, but often glide while flying which is uncharacteristic of geese. www.wildlifedepartment.com /cormorant.htm   (591 words)

All About Birds Cormorants have been suggested as playing an important role in the collapse of some fisheries, although data to support these claims are sparse. Cormorant populations greatly decreased in the 19th and early 20th centuries from human persecution. Cormorants eat fish at fish farms, and recent legislation has been proposed to control cormorant numbers. www.birds.cornell.edu /programs/AllAboutBirds/BirdGuide/Double-crested_Cormorant.html   (338 words)

Double-crested Cormorant Upon capturing a fish, Double-crested Cormorants may eat it under the surface, or if it is large and unwieldy, may bring it to the surface, where the bird may shake the prey, whack it on the water's surface, toss it into the air, and swallow it, head first. Double-crested Cormorants breed in the Aleutian Islands and on the southern coast of Alaska, and on parts of the Pacific coast of Washington and Oregon, as well as San Francisco Bay, California. Double-crested Cormorants feed close to shore in relatively shallow water, diving from the surface and propelling themselves swiftly with their feet. www.birds.cornell.edu /BOW/doccor   (895 words)

Cormorant Management in New York Managing Double-crested Cormorants in the Eastern Basin of Lake Ontario, 1999 Excerpt from a poster presented at AOU meeting. Cormorant populations have increased markedly across New York in recent years, likely a result of a cleaner environment and fewer pesticides causing reproductive problems. And in the eastern basin of Lake Ontario, cormorants have been found to be a significant predator of smallmouth bass, which is a native, economically important species. www.dec.state.ny.us /website/dfwmr/cormorant/index.html   (539 words)

Fact Sheets > Double-Crested Cormorant Cormorants are aquatic birds found on inland lakes, rivers and swamps as well as on the coast. Cormorant is the common name for 30 species of birds that occur world-wide. Cormorants have no oil glands to grease their feathers and repel water. www.fact-sheets.com /science-nature/animals/cormorant   (550 words)

BioKIDS: Double-crested cormorant (Phalacrocorax auritus) : Information Cormorants are large birds (70 to 90 cm in length, 1.2 to 2.5 kg) with dark brown or black plumage that has a dull greenish or bronze sheen. Adult cormorants leave the nest unguarded when they are disturbed, leaving the chicks and eggs vulnerable to predation by gulls and other predators, and to overheating in the hot sun. Adult cormorants and chicks are susceptible to predation by bald eagles, and occasionally by great horned owls, caiman and brown pelicans. www.biokids.umich.edu /critters/information/Phalacrocorax_auritus.html   (1325 words)

Double-crested Cormorant Double-crested Cormorant: The majority of this cormorant's diet consists of fish, although crustaceans and amphibians from fresh water are also taken. Double-crested Cormorant: The males have elaborate courtship dances, including dances in the water where he presents the female with material to build a nest. Double-crested Cormorant: This cormorant breeds locally from Alaska, Manitoba, and Newfoundland south to Mexico and Bahamas. identify.whatbird.com /obj/68/_/Double-crested_Cormorant.aspx   (739 words)

Cormorant family The Cormorants are a fairly large family of fisheaters residing along freshwater and saltwater shores around the world, yet all are so closely related that all are usually placed within a single genus Phalacrocorax. Cormorants used traditional sites for roosting and nesting, and the droppings at these sites can build up for years. Cormorants are found almost everywhere that water meets shore. montereybay.com /creagrus/cormorants.html   (739 words)

The Japan Times Online Cormorants are migratory and are protected by the Migratory Bird Treaty Act (MBTA), originally of 1918. As to fishermen's claim that cormorants are depleting certain fish stock, it remains unproven. What has happened to cormorants is yet another story of humans overpowering animals whenever they see them getting in their way. www.japantimes.co.jp /cgi-bin/geted.pl5?eo20050725hs.htm   (883 words)

[No title] Modeling indicated that lowering the double-crested cormorant population from 17,361 to 10,000 pairs could be attained only by a combination of techniques: culling breeding birds in arboreal colonies to lower breeding stock and egg spraying in accessible ground nests to lower recruitment. Impact of Double-crested cormorant depredation on Channel-catfish farms. Owre O. Adaptations for locomotion and feeding in the anhinga and the double-crested cormorant. web.tiscali.it /sv2001/cormo_abstract/phaau_bi.htm   (9306 words)

Double-Crested Cormorant--BIOLOGICAL AND ECOTOXICOLOGICAL CHARACTERISTICS OF TERRESTRIAL VERTEBRATE SPECIES RESIDING IN ESTUARIES Population status of 11 colonies of cormorants was related to contaminant residues and eggshell thickness. Examination of 497 DCC nests on 3 islands in the Gulf of Maine during 1987 and 1988 revealed the presence of plastic debris in 188 or 37% of the nests (Podolsky and Kress, 1989). DCC eggs (N=10) were collected in 1979 along the Oregon coast for residue analysis and the measurement of eggshell thickness (Henny et al, 1982). www.pwrc.usgs.gov /bioeco/dbcrcorm.htm   (6702 words)

Double-crested Cormorant Rosche (1979) stated that double-crested cormorant was primarily a migrant in the lower North Platte River Valley, present 28 March to 3 June, and 2 September to 6 November. Tout (1947) considered double-crested cormorant a rare migrant in Lincoln County; his latest date was 12 November 1938. Collister stated that the total number of double-crested cormorants present on Lake McConaughy in 1948 was 1,000 individuals. www.npwrc.usgs.gov /resource/birds/platte/species/phalauri.htm   (470 words)

New Page 2 When 15 tonnes of dead cormorants were dumped using all-terrain vehicles on the very island the MNR was claiming to protect, it was evident their objective was not about protecting the ecology of the area. Cormorants receive a lot of negative attention because they are highly visible; nest in large colonies and feed close to the shoreline. Cormorants choose to colonize islands close to shore, and headlands wherever there is an abundant food supply. www.earthroots.org /cormorants/contents.shtml   (1922 words)

The Double-Crested Cormorant The Double-crested and the Florida Cormorants are very nearly allied, their forms, and the structure of their plumage, being precisely similar. It is probable that neither the Double-crested nor the Florida Cormorants occur in any part of Europe; at least, if they have been described as birds of that quarter of the globe, I can find no account sufficiently correct to enable me to recognise them. Like other species, the Double-crested Cormorants are fond of sunning themselves, with their wings spread out. www.audubon.org /bird/BoA/F41_G1b.html   (2356 words)

::Seabirds:: (Double-Crested Cormorant) Cormorant feathers are unique compared to other diving birds in that they are not naturally waterproof. Cormorants dive underwater and use their large webbed feet as paddles to swim in search of food. Before the young cormorants fledge, they wander from their nest to socialize with other young cormorants in groups called creches. www.absc.usgs.gov /research/seabird_foragefish/seabirds/flash_cards/double_crested_comorant.html   (363 words)

NJAS: Double-crested Cormorant Alert Double-crested Cormorants are being blamed for the collapse of fisheries. The scapegoating of Double-crested Cormorants for these fishery declines is without scientific merit; the birds represent an easy public target rather than dealing with the real causes of decline by restricting harvest, restoring habitat, restricting harmful contaminants, eliminating invasives, and breaching or installing fish passages on dams. To shoot Cormorants or destroy eggs and nests, the agencies would have to find that the Cormorants are "injurious to public resources" such as fish, plants, or other species. www.njaudubon.org /Conservation/DCCalert.html   (769 words)

Article on Cormorant predation on Lake Ontario gamefish Federal biologists have estimated that cormorants eat between 400,000 and 1.2 million smallmouth bass a year in the eastern part of the lake. Around eastern Lake Ontario, fish-eating cormorants have staged a dramatic recovery since the 1950s, when they were nearly wiped out by pesticides and shooting. State biologists said that when they went ashore on the uninhabited Little Galloo Island on Wednesday they encountered heaps of carcasses of fledgling cormorants, piles of shotgun shells and starving chicks squawking weakly among the carnage. www.fishingnj.org /artcormorant.htm   (1397 words)

IFWIS - Double-crested Comorant Double-crested cormorants are protected under the Illinois Endangered Species Protection Act, 1972, the Illinois Wildlife Code, 1971, and the Federal Migratory Bird Treaty Act, 1918 *08, 25,26*. Verbeek (1982) reports that crows were responsible for the destruction of 22% of cormorant eggs (first clutch) in B.C. human disturbance often mentioned *08,11,21,24,30,32*. Meier (9181) states that in the George W. Mead wildlife area of central Wisconsin, the cormorant population "expanded at an annual rate of approx. www.inhs.uiuc.edu /chf/pub/ifwis/birds/double-crested-comorant.html   (1532 words)

The double-crested cormorant: One of the side effects of having a large colony of double-crested cormorants in a treed area is that their excrement rapidly damages the leaves of trees where they build their nests. The cormorants, which co-exist with gulls and night herons on this three-pronged peninsula on Lake Ontario, have begun to concern biologists - not because the cormorants or gulls are in any trouble, but because the herons are literally being squeezed out of their leafy-treed habitat there. Regardless, the fact remains that the cormorants numbers continue to climb and the fishers feel nothing is being done to control the population. www.exn.ca /html/templates/printstory.cfm?id=2001022853   (741 words)

Cormorants Studies released by the New York Department of Environmental Conservation indicate that the decline of Lake Ontario's small mouth bass fishery is directly related to the rise in population of the Double-Crested Cormorant. Based on eleven studies conducted in 1998 on the cormorant's feeding habitats that show that cormorants have a significant impact on warm water fish populations. Only one pair of cormorants could be found nesting in Vermont in the 1980's compared to an estimated 4,000 nesting pairs in 1997. www.harborwatch.com /news/cormorants.htm   (326 words)

Double-crested Cormorant Anglers insist that the cormorants tend to favor fish that are commonly regarded as prize catches. The acidic nature of the cormorant’s feces kills the surrounding vegetation and eventually leads to the death of the nesting tree. The mating dance of the male cormorant is an intricate one, including seduction of the female with nesting materials. www.iisgcp.org /EXOTICSP/cormorant.html   (853 words)

Neotropic Cormorant - South Dakota The Neotropic Cormorant is very similar to the Double-Crested Cormorant, and is sometimes found with them. Neotropic Cormorants are found throughout the American Tropics up through Texas, but have been expanding their range northward in recent decades. Normally found in the extreme southern U.S. and Mexico, the Neotropic Cormorant is expanding its range northward, but is still a very rare visitor to South Dakota. huskertsd.tripod.com /species/neotropic_cormorant.htm   (151 words)

Birds of Nova Scotia - Double-crested Cormorant Remarks Some commercial and sport fishermen consider both species of cormorants to be "bad birds." They are often condemned as killers of trout and other fishes of importance to man, but data acquired from studies of the food habits of the Double crested Cormorant (Lewis 1929, 1957) tend to refute these charges. According to a 1971 Canadian Wildlife Service survey (Lock and Ross 1973), the Nova Scotian population of Double-crested Cormorants numbered about 4,400 pairs, out of some 10,600 pairs breeding in Atlantic Canada and the Gulf of St. Lawrence. Both species of cormorants are protected throughout the year by provincial statute in Nova Scotia. museum.gov.ns.ca /mnh/nature/nsbirds/bns0028.htm   (587 words)

DOUBLE-CRESTED CORMORANT DEPREDATION ORDER The primary responsibility for double-crested cormorant management rests with the FWS and State authorities. Any cormorants directly taken by WS as a result of this depredation order will be reported as a part of the information included in the MIS annual report. Aquaculture producers who, prior to March 4, 1998, (1) held cormorant depredation permits from the FWS and (2) had ADC Form 37s completed by Wildlife Services will be considered certified to take cormorants. aquanic.org /news/1999/interm.htm   (450 words)

9&10 News:  Double Crested Cormorant (7/24/2005) A green sludge of feces surrounds a rocky shoal that is home to thousands of double crested cormorants in Little Bay de Noc, about a mile offshore of No-See-Um Creek near Escanaba. The cormorant was nearly extinct in the Great Lakes region 20 years ago, but is now flourishing. The Bay de Noc's once abundant perch population has declined and locals say cormorants are partially to blame. www.9and10news.com /News/Story.asp?StoryID=43872   (184 words)

U.S. Fish and Wildlife Service, Division of Migratory Bird Management, Issues,Cormorants Symposium on Double-crested Cormorants: Population Status and Management Issues in the Midwest Status of the Double-Crested Cormorant in North America Management of cormorant predation on salmonid smolts in the Columbia River estuary www.fws.gov /migratorybirds/issues/cormorant/cormorant.html   (138 words)

DigitalCommons@University of Nebraska - Lincoln Double-crested cormorant satellite telemetry: preliminary insight Although over 8,000 banded Double-crested Cormorants (Phalacrocorax auritus) have been recovered in North America since 1923, the movements of wintering and breeding cormorants remain poorly understood. Preliminary data suggest that cormorants generally remained near aquaculture facilities where they were captured, marked, and released. Two cormorants, however, emigrated from primary aquaculture areas prior to their spring (northward) migrations. digitalcommons.unl.edu /icwdm_wdmconfproc/31   (291 words)

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