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1 June 2013 Nesting and Foraging Characteristics of Aquatic Warblers Acrocephalus paludicola in the Fast Declining Pomeranian Population (NE Germany/ NW Poland)
Franziska Tanneberger, Jochen Bellebaum, Angela Helmecke, Marharita Minets
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Abstract

Limited food availability could be a cause for the strong decline of the small and isolated Aquatic Warbler population in Pomerania (NE Germany/NW Poland). In this paper, we describe nesting site conditions, nest placement and female foraging behaviour as well as food supply in vegetation types prevailing in Pomeranian breeding areas. Female Aquatic Warblers in Pomerania appeared to select ‘managed’ sites (where land use maintains suitable conditions for Aquatic Warbler) for nesting, and preferred vertical structures (ditches and edges within ‘managed’ sites) for foraging. They flew longer distances for provisioning their nestlings than in the core population (E Poland, Belarus) whereas the total distance travelled per 30 minutes was similar. In ‘managed’ sites, the total invertebrate biomass was larger than in ‘unmanaged’ sites in early June when early broods are raised. Pomeranian Aquatic Warblers are able to exploit relatively rich food sources in ‘managed’ meadows and in vertical structures and may thus balance the higher efforts of flights longer than in Eastern Poland and Belarus. To increase the availability of suitable Aquatic Warbler nesting and foraging sites in Pomerania, management by mowing should be continued. It might yield the best results when providing a mosaic of ‘managed’ and ‘unmanaged’ patches.

Franziska Tanneberger, Jochen Bellebaum, Angela Helmecke, and Marharita Minets "Nesting and Foraging Characteristics of Aquatic Warblers Acrocephalus paludicola in the Fast Declining Pomeranian Population (NE Germany/ NW Poland)," Acta Ornithologica 48(1), 109-118, (1 June 2013). https://doi.org/10.3161/000164513X670061
Received: 1 August 2012; Accepted: 1 June 2013; Published: 1 June 2013
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