Great Cormorant (Phalacrocorax carbo) Science Article 18 abstract Two Cormorant colonies in The Netherlands (Naardermeer and Oostvaardersplassen), exploiting the same water bodies but situated at different distances from them, were compared with respect to daily variations in exact fishing sites and corresponding variations in time budget and fish consumption. Mean flying distances between colony and […]
Daily energy expenditure of Great Cormorants Phalacrocorax carbo sinensis wintering at Lake Chiemsee, Southern Germany.
Great Cormorant (Phalacrocorax carbo) Science Article 32 abstract In the winters of 1993/94 and 1994/95 the daily energy expenditure (DEE) of Great Cormorants Phalacrocorax carbo sinensis was measured using the doubly labelled water technique (DLW). This was the first time the method has been used on a Phalacrocoracid species. DLW trials were carried out on […]
Sexual dimorphism in the Cormorant Phalacrocorax carbo sinensis: Possible implications for differences in structural size.
Great Cormorant (Phalacrocorax carbo) Science Article 27 abstract A sample of Cormorants which accidentily had been drowned in fishermen’s gear was used to study differences in morphological characters and diet between males and females. Males were significantly larger than females in all body dimensions, whereas size of juveniles and adults were the same. Discriminant analyses […]
Cormorants Phalacrocorax carbo sinensis in shallow eutrophic freshwater lakes: Prey choice and fish consumption in the non-breeding period and effects of large-scale fish removal.
Great Cormorant (Phalacrocorax carbo) Science Article 22 abstract During the period October 1989-April 1992 a study on Cormorant feeding ecology was carried out in two shallow lakes in The Netherlands: lake Veluwemeer and lake Wolderwijd (3240 and 2600 ha respectively). Increasing numbers of Cormorants use these lakes for feeding in the non-breeding season; the maximum […]
Status distribution and habitat use by Cormorants Phalacrocorax carbo wintering in Britain
Great Cormorant (Phalacrocorax carbo) Science Article 25 abstract This paper describes a study of Cormorants wintering in Britain based on information collected as part of the National Waterfowl Counts scheme for the four winter seasons from 1987/88 to 1990/91. Birds were found to be widely distributed throughout Britain, both inland and on the coast, with […]
Changes in abundance of cyprinid and percid prey affect rate of predation by Cormorants Phalacrocorax carbo carbo on Salmon Salmo salar smolt in northern Ireland
Great Cormorant (Phalacrocorax carbo) Science Article 23 abstract Cormorant diet is described from the analysis of pellets, fledgling regurgitates and the stomach contents of adult birds. Non-breeding coastal birds consumed mostly marine fish while breeding birds were found to feed mostly on freshwater fish species. The long distances travelled to inland feeding sites while breeding […]
The telltale heart: A non-invasive method to determine the energy expenditure of incubating Great Cormorants Phalacrocorax carbo carbo.
Great Cormorant (Phalacrocorax carbo) Science Article 31 abstract We studied the energetics of incubating Great Cormorants Phalacrocorax carbo carbo via heart rate and respirometric measurements performed in captive and free-living animals. We applied a modified heart beat frequency (HR) monitor built for use in human athletics as well as respirometry for measurements in four captive-bred […]
Roach rules: Shoaling fish are a constant factor in the diet of Cormorants Phalacrocorax carbox in Switzerland
Great Cormorant (Phalacrocorax carbo) Science Article 29 abstract The spatial and temporal variation in the diet of Cormorants Phalacrocorax carbo visiting Switzerland in the non-breeding season was studied from 1985-1992, by means of regurgitated pellets and stomach contents. The results, combined with the data of most other dietary studies from Switzerland since 1974, rest on […]
Food of Cormorants Phalacrocorax carbo sinensis wintering in Bavaria, southern Germany.
Great Cormorant (Phalacrocorax carbo) Science Article 21 abstract Following the spectacular population increase in continental Cormorants, numbers of wintering birds on lakes and rivers in Bavaria, southern Germany, have risen sharply. Because of a growing concern among commercial fishermen and anglers, a diet study has been carried out at two major roosts: one at a […]
Reproduction of a Newly-established Population of the Great Cormorant in Northeastern Italy
Great Cormorant (Phalacrocorax carbo) Science Article 2 abstract A study of the breeding biology of the Great Cormorant (Phalacrocorax carbo sinensis) was carried out during 1993-1998 in the Po River Delta, a major wintering area in northeastern Italy. The first of five colonies was founded in 1993, and breeders increased from 69 pairs in 1994 […]