Nest-site selection and predation in Savi's Warblers Locustella luscinioides

Abstract

Capsule Savi's Warblers preferred sites dominated by high and dense Juncus and Rubus with thick litter, and avoided pure reeds; predation was higher in sites with less litter. Aim To describe nest-site selection and identify which habitat and nest features influence predation risk. Methods Comparisons were made between habitat characteristics measured at nest-sites and random points, and between predated and successful nests. Results Total vegetation cover, litter thickness, habitat type, undergrowth height and undergrowth cover, which were higher or denser at nest-sites, were the most important variables influencing the distribution of Savi's Warbler nests. Nests were most often predated in sites with low litter thickness. Conclusion Savi's Warblers are dependent on the presence of dense low vegetation and litter for nesting, which should be maintained close to or within reed-beds for their benefit.