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The food resource use of a stream in NW Spain by fish (Salmo trutta L. and Anguilla anguilla L.), birds (Cinclus cinclus L. and Motacilla cinerea L.) and mammals (Galemys pyrenaicus G. and Neomys anomalus C.) was studied. Data on seasonal diets and stream benthos prey were used to determine prey selection patterns.

The feeding of the Pyrenean Desman (Galemys pyrenaicus) in Galicia (N.W. Spain) is described using the data obtained from the study of eight stomach and intestine contents.The Pyrenean Desman feeds mainly on the larvae stages of Ephemeroptera (35,8 % in terms of numerical frequence), Trichoptera (32 %), Diptera (24 %) and Plecoptera (4,3%). When prey volumes were taken into account, both Trichoptera (67,4%) and Ephemeroptera (20,7 %) were the most important groups into the diet.Some coments on the role of the Pyrenean Desman as a biological indicator of water quality is also added.Résumé. -Dans ce travail on étudie l'alimentation du desman des Pyrénées à partir de l'examen du contenu stomacal et intestinal de huit exemplaires capturés dans différentes rivières du nord-ouest de l'Espagne (Galice). La base de l'alimentation est constituée par des larves d'Ephéméroptères (35,8 % des proies identifiées), de Trichoptères (32 %), de Diptères (24 °?o) et de Plécoptères (4,3 %). Si l'on considère le pourcentage en volume que chaque type de proie apporte au régime alimentaire, on remarque l'importance des Trichoptères (67,4 %) et des Ephéméroptères (20,7 %). Si nos résultats se confirment, le desman peut être considéré comme un excellent indicateur de la qualité biologique des eaux.

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This work studies the diet of Dippers in the basin of of the River Ulla based on the analysis of 22 regurgitated pellets and 2 faecal samples during the summer of 1986. Ephemeroptera, particularly Ephemerella and Bqetidae, and Trichoptera, comprised respectively 50.6% and 24.6% of the'.9~i items recorded. Plecoptera, Formicidae, Hidrobiidae Odonata, Coleoptera, Gammaridae, sorne Díptera and small amphibians comprised the other 24.8% of the items.The diet of Dipper.s living in rivers is also compared to the diet of those living in streams. The results in the frequency of the main preys are similar to those obtained by ORMEROD, (1985), over breeding Dippers in the catchment of the River Wye, Wales.