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Bluethroat luscinia svecica cyanecula l. 1758 in the marshy narew river valley poland



Bluethroat luscinia svecica cyanecula l. 1758 in the marshy narew river valley poland



Ochrona Przyrody 47: 215-234



Within the area of 136 km2 in the Narew river valley between Suraz and Tykocin (North-eastern Poland) 125 breeding pairs of Luscinia svecica cyanecula were recorded. In this number 97 pairs occurred in the not drained marshy part of the valley from Suraz to Zoltki (density 101 pairs per 100 km2), where they occupied only edges of the alder swamp-forests Carici elongatae-Alnetum (density on these habitats: 1.8 to 9.1 pairs per 10 ha). In the drained part of the valley from Zoltki to Tykocin 29 pairs were recorded, but all of them concentrated on marshes which had remained after the drainage. In this part of the study area willow thickets Salici Franguletum were the only occupied type of habitat (density 8.5 pairs per 10 ha). Bluethroat turned out to be a species closely connected with the ecotone which forms at the junction line between wet forests or thickets and open marshes. Its breeding is conditioned by moderately high level of water above the ground surface, and at the same time the existence of dry places which enable nesting. A hypothesis has been put forward, supported with results of studies from other in North-eastern Poland, that at least in a part of Central Europe the alder swamp-forest Carici elongatae-Alnetum in its early stage of succession is the primary habitat of bluethroat. At the same time some shrub communities and other flooded sites are its secondary habitats, which became accessible due to hydrological changes produced by human management.

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