Aves, p�le ornithologique de Natagora

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Aves, 30/3-4 | 1993 | 181-193

  Diet of Picardy coast Laridae.
Sueur, F.

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Article summary

The diet of Laridae in two regions of the Picardy coast, the Somme Bay and the sandy strand further North, has been studied for several years. Prey have been identified by direct telescope observation, and the results are given in the form of frequency of items consumed. These vary according to the site and/or the season under consideration. Small invertebrates, in particular Crustacea, seem to be relatively important for all species of laridae except for the Great Black-backed Gull (Larus marinus) which seems to prefer fish and carrion all year round at these two sites. Small invertebrates also figure prominently for the Black-headed Gull (Larus ridibundus), and for the Lesser Black-backed Gull (Larus fuscus) but data concerning the latter is limited to the autumn and to the strand to the North. The Edible Cockle (Cerastoderma edule) forms an important, and even main, part of the menu for the Common Gull (Larus canus). For the Herring Gull (Larus argentus), the Common Mussel (Mytilus edulis) and the Edible Cockle are normally the main prey but they are supplanted during the summer on the strand to the North by Annelids, mainly the Sand Mason (Lanice conchilega). This species and the Shore Crab (Carcinus maenas) are the most frequent prey of the Yellow-legged Gull (Larus cachinnans) in the summer on the strand to the North.