Janusz Stępniewski
Ornis Polonica 2011, 52: 247–254
https://doi.org/10.12657/ornis.2011.4.1
Abstract: At the Łoniewskie Lake, numbers of Bearded Reedling breeding pairs fluctuated strongly, from just few in some years to 60 pairs in 2000 and 2008. They most frequently bred in north-eastern and southern parts of the lake, where preferred habitats predominated. Bearded Reedlings bred either singly (45.2% of 155 breeding groups, where group was defined by the distance between nests) or in aggregations of 2–13 pairs (54.8%). The most frequent were aggregations of 2–4 pairs (45.2%) The minimum distances between occupied nests were 2.5 and 3.0 m. Nests were built inside the rushes (70.1%) and at their edges (22.0%); less frequently close to the open water surface (7.9%). Nests were supported on the tussocks Carex sp. (36.2%), Narrowleaf Cattail Typha angustifolia (34.8%) and Common Reed Phragmites australis (26.8%). Mean water depth just below the nest was 14 cm (SD=10.1; range 1–52; N=78).
