Winter diet of great cormorant (Phalacrocorax carbo) on the River Vltava: estimate of size and species composition and potential for fish stock losses

@article{ech2011WinterDO,
  title={Winter diet of great cormorant (Phalacrocorax carbo) on the River Vltava: estimate of size and species composition and potential for fish stock losses},
  author={Martin {\vC}ech and Luk{\'a}{\vs} Vejř{\'i}k},
  journal={Folia Zoologica},
  year={2011},
  volume={60},
  pages={129 - 142}
}
Abstract. The winter diet of the great cormorant (Phalacrocorax carbo) was studied by means of examining regurgitated pellets, individual fish bones and fish remains collected from below the roosting trees in two sites on the River Vltava in Vyšší Brod and at Slapy Reservoir, Czech Republic, and by analysis of stomach contents of birds shot on the River Vltava in Prague. Using diagnostic bones (os pharyngeum, dentale, maxillare, praeoperculare) and own linear regression equations between… 

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References

SHOWING 1-10 OF 46 REFERENCES

Size Selectivity in Summer and Winter Diets of Great Cormorant (Phalacrocorax carbo ): Does it Reflect Season-Dependent Difference in Foraging Efficiency?

The winter elevation of foraging efficiency described for Great Cormorants in the literature is due to capturing larger fish not to capturing more fish, as well as the opposite tendency of dominant “small growing”, torpedo-shaped species.

Feeding ecology of sympatric European shags Phalacrocorax aristotelis and great cormorants P. carbo in Iceland

The results suggest that predation by shags and cormorants could sometimes affect the stocks of the commercially important saithe and plaice in Iceland.

Roach rules: shoaling fish are a constant factor in the diet of Cormorants Phalacrocorax carbo in Switzerland

The spatial and temporal variation in the diet of Cormorants Phalacrocorax carbo visiting Switzerland in the non-breeding season was studied, by means of regurgitated pellets and stomach contents, to find a preference for eutrophic lakes that support high densities of Roach and Perch.

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

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

Diet and prey selection of cormorants (Phalacrocorax carbo) at Loch Leven, a major stocked trout fishery.

It is suggested that stocking has led to an increase in cormorant numbers and the subsequent increase in predation may have prevented any increase in the trout population or in fishery catches.

Diet spectrum of great cormorants (Phalacrocorax carbo sinensis L.) at the Donji Miholjac carp fishponds in eastern Croatia

The study revealed no significant relationship between the weight of the consumed fish and the body weight of male and female cormorants.

Further European integration: mixed sub-species colonies of great cormorants Phalacrocorax carbo in Britain - colony establishment, diet, and implications for fisheries management

Inland colonies of Great Cormorants Phalacrocorax carbo in Britain contain individuals of both European subspecies the Atlantic Great Cormorant P.c. carbo and the Continental Great Cormorant P.c.

Spatial Patterns of Winter Diet of the Great Cormorant in Coastal Wetlands of Greece

Differences found in diet between areas are probably due to differences in prey species composition and abundance, and suggests minimal competition with fisheries.

Habitat and Temporal Variation in Diet of Great Cormorant Nestlings in Greek Colonies

The low consumption of valuable fish prey by Great Cormorant nestlings suggests minimal competition with human interests and confirms this bird’s opportunistic behavior.