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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Breeding success of Little Ringed Plovers Charadrius dubius improved by protection of breeding sites on the Upper Isar, Bavaria
Auteurs :	Michael Schoedl, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (46(2-3) DEC 2007)
Article en page(s) :	121-128
Résumé :	Little Ringed Plovers rarely breed by rivers in Germany due to loss of habitat and disturbance of gravel banks. Between 2002 and 2004 breeding sites along the river Upper Isar (Bavaria) were protected from recreational disturbance. Parts of big gravel banks were marked off with plastic tapes. These tapes did not deter birds from using these sites for nesting but reduced recreational disturbance. Public information helped gain acceptance of the restrictions. Breeding success in the marked areas was more than 3 times higher in terms of the number of fledglings than in years without special protection. Fewer nests were directly destroyed and there was less disturbance of birds guarding their chicks. Monitoring of the entire river section between the Austrian border and the Sylvenstein Reservoir showed that Little Ringed Plovers bred earlier when gravel banks are so protected. Chicks hatched earlier and the chances of second clutches rose.The breeding success in the protected areas (1.6 km of river course) was significantly higher than in the remaining areas (4.6 km), which are also disturbed, if less intensively.There was however no obvious increase in the population size, which remained more or less constant at between seven to 12 breeding pairs from 1996 to 2006. It remains to be determined whether habitat quality and suitability stayed constant in spite of floods in 1999 and 2005 or whether the population is limited by basic mechanisms of territoriality.

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