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 […]
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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 […]
Sub-specific differentiation and distribution of Great Cormorants Phalacrocorax carbo in Europe
Great Cormorant (Phalacrocorax carbo) Science Article 1 abstract The use of biometrics for sub-specific differentiation of Great Cormorants Phalacrocorax carbo in Europe was investigated using skins of known subspecies and showed that gular pouch angle is a useful character for assigning individuals to sub-species. Where further measurements of bill depth and bill length can be […]
Net-entrapment of great cormorants Phalacrocorax carbo sinensis in relation to individual age and population size
Great Cormorant (Phalacrocorax carbo) Science Article 8 abstract Population control of great cormorants Phalacrocorax carbo sinensis has beensuggested as a tool to mitigate fish losses by cormorants foraging in pound nets,gill nets and fykes. The objective of our study was to quantify the differencebetween first-year birds and older birds in the risk of drowning in […]
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 […]
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 […]
Great Cormorants Phalacrocorax carbo and polych tes: can worms sometimes be a major prey of a piscivorous seabird?
Great Cormorant (Phalacrocorax carbo) Science Article 3 abstract Cormorants mainly eat fish, but remains of other prey are often found in their regurgitated pellets. Such remains are usually considered to stem from prey that were present in the stomachs of fish, eaten by the bird, i.e. from secondary prey. We present several cases were Great […]
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 […]
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 […]