The Red-backed Shrike and the Barred Warbler are a pair of species engaged in breeding association. Whilst the arrival time of both species from their wintering grounds was not correlated, they differed in median arrival time by only one day. The majority of the Barred Warbler territories were located within those of the Red-backed Shrike, in both forest and farmland plots. The two species differed significantly in their selection of nest sites, at least in farmland. Unlike the Red-backed Shrike (n = 297), the Barred Warbler (n = 60) preferred blackberry bushes and small deciduous thornless shrubs, and avoided elder, conifers and hawthorn. The Barred Warbler nests were placed significantly lower than those of the Red-backed Shrike. The results show that no special ecological relationships exist as was suggested in earlier papers for other areas.
Kuźniak, Stanisław (1933– )
Tryjanowski, Piotr Karg, Małgorzata K. Karg, Jerzy
Tryjanowski, Piotr Yosef, Reuven
Mielewczyk, Stefan (1933–2005)
Gotzman, Jerzy ( –2004)
Feliksiak, Stanisław (1906–1992)
Tryjanowski, Piotr Hromada, Martin (1969– ) Antczak, Marcin