Aves, p�le ornithologique de Natagora

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Aves, 14/2 | 1977 | 128-144

 
Hallet, C.

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Article summary

Our study is based on the analysis of pellets collected in different nests along the same river (the Lesse is a tributary of the river Meuse). The obtained results for 12 sites - giving a total of 14.475 elements of fish- show that approximatively 90 % of Kingfisher's piscivorous diet is composed of Bulhead (Cottus gobio) and Cyprinidae. The loachs (Cobitidae) come in for roughly 6 % whereas the Stickleback (Gasterosteus aculeatus), Trout (Salmo sp., Grayling (Thymallus thymallus) and the Perch (Perca fluviatilis) are only found locally and in very reduced numbers. The Ruffe (Acerina cernua) and the Pike (Esox lucius) are pratically non existant. Kingfisher seems to be a good sampler of a fish fauna. Indeed all the species occuring in the Lesse were found in his diet except the Eel (Anguilla anguilla) and the Lamprey (Lapetra fluviatilis). Discrete species and those with important growth rate, reaching quickly an unavailable length to Kingfishers are less caught by them. Fish populations quantitative studies based on our method must be avoided.

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