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The diet of great cormorant Phalacrocorax carbo on the upper Sava river in the winter of 1998/99 Slovenia Prehrana kormorana Phalacrocorax carbo na obmocju zgornjega toka reke Save v zimi 1998/99 Slovenija


Acrocephalus (Ljubljana): 23115: 169-178
The diet of great cormorant Phalacrocorax carbo on the upper Sava river in the winter of 1998/99 Slovenia Prehrana kormorana Phalacrocorax carbo na obmocju zgornjega toka reke Save v zimi 1998/99 Slovenija
The diet of Great Cormorant Phalacrocorax carbo, occurring on the upper Sava river, was studied in the second half of the winter 1998/99 by means of regurgitated pellets, collected at the Great Cormorants' night roost near Radovijica, Among 99 collected pellets, 73 contained remains of fish. In individual pellets, remains of 1 to 11 fish (median 2, average 2.8) were found, Altogether, remains of 204 fish were found. Length and weight were determined for 178 of them. The diet consisted ot seven fish species (Grayling Thymallus thymallus. Trout Salmo trutta. Chub Leuciscus cephalus. Perch Perca fluviatilis, Danube Roach Rutilus pigw virgo. Rainbow Trout Oncorhynchus mykiss, and Roach Rutilus rutilus). The diet was dominated by Grayling (51.0% by number, 64.3% by biomass and 69.9% by occurrence), Trout (21.1% by number, 9.7% by biomass, and 34.3% by occurrence) and Chub (9.3% by number, 14.4% by biomass, and 13.7% byoccurrence). Prey size ranged from 3.7 cm (undetermined Cyprinidae) to 40.8 cm (Grayling) and mass from < 1.0 g (undetermined Cyprinidae) to 714.9 g (Grayling). Most frequent length class was 15-20 cm (33.1%). Average length of prey was 16.3 cm (median 16.3 cm). Average length of Grayling was 18.5 cm (median 18.2 cm, Ql - Q3: 15.0 - 20.4 cm, min - max: 4.5 - 30.8 cm) and 12.8 cm ofTrout (median 12.4 cm, Ql - Q3: 10 - 14.9 cm, min - max: 5.7 - 22.4 cm). Significant differences between months in number of specimens of the three most important fish species were probably a consequence of different feeding areas. Grayling and Chub were assumed to be in a larger proportion in the Great Cormorants diet than in the feeding habitat .

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Accession: 038746733



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