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 […]
Tag: Great Cormorant
Where two subspecies meet: Origin, habitat choice and niche segregation of Cormorant Phalacrocorax c. carbo and P. c. sinensis in the common wintering area France, in relation to breeding isolation in Europe.
Great Cormorant (Phalacrocorax carbo) Science Article 24 abstract The wintering population of Cormorants Phalacrocorax carbo in France reached 66000 birds in January 1992 against 14 000 in 1983. This increase largely concerned the inland areas (holding 55% of the population instead of 28% in 1983). The most important area is the Loire Valley. Analysis of […]
Subspecific identity of prehistoric Baltic Cormorants Phalacrocorax carbo.
Great Cormorant (Phalacrocorax carbo) Science Article 30 abstract Cormorants of the subspecies Phalacrocorax carbo sinensis breed in large numbers in the Baltic Sea. They migrate to the Mediterranean region to winter and are then replaced in the Baltic by wintering individuals of the Norwegian population of the nominate subspecies carbo. Cormorants bred in the Baltic […]
The relative importance of physiological and behavioraladaptation in diving endotherms: a case study with great cormorants
Great Cormorant (Phalacrocorax carbo) Science Article 10 abstract Extensive morphological and physiological adjustments are assumed to underpin the adaptations of diving birds tohigh thermoregulatory costs. However, the role of behavioral adaptations has received little consideration. We have assessedthe relative importance of physiological and behavioral adjustments in aquatic endotherms by studying the case of the poorlyinsulated […]
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 […]
Perch fidelity of Cormorants Phalacrocorax carbo outside the breeding season
Great Cormorant (Phalacrocorax carbo) Science Article 14 abstract The perch fidelity of the Cormorant Phalacrocorax carbo sinensis has been studied during migration and winter time on a roost at Lake Geneva, Switzerland. A one-perch fidelity index was computed for 217 individuals. It appears that the perch fidelity increases with the age of the Cormorant, but […]