Algunos datos sobre la alimentación del mirlo acuático (Cinclus cinclus) en la cuenca del río Ulla, Galicia

Abstract

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.

Using biological traits to assess diet selection: the case of the Pyrenean Desman

“…Regarding cased Trichopterans, researchers have reported contrasting results, from positive ( Santamarina and Guitian 1988 ; Santamarina 1992 , 1993 ) to negative preference ( Bertrand 1992 ; Biffi et al 2017b ). Cases do not condition the selection for Trichopterans in dippers ( Cinclus cinclus ; Santamarina 1990 ; Ormerod and Tyler 1991 ; Taylor and O’Halloran 1997 , 2001 ), which share the habitat and trophic preferences with desmans. These contrasts likely derive from the force with which the cases adhere to the substrate and body size because small prey with more fixed, thicker cases (e.g., Glossossomatidae and Goeridae) are less consumed than larger prey with less fixed cases (e.g., Limnephilidae, Odontoceridae, and Sericostomatidae; Vieira-Lanero 2000 ; Esnaola et al 2021 ).…”