ISSN 0235-7224
ISSN 2029-0586 (online)
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2009 m. Nr. 3-4
Nest-site use by Black Stork and Lesser Spotted Eagle
in relation to fragmented forest cover: case study from
Lithuania
Rimgaudas TREINYS, Saulis SKUJA, Danas AUGUTIS, Darius STONČIUS
Black Stork and Lesser Spotted Eagle are forest-dwelling species that nest in mature forests, thus are in conflict with the timber harvesting. No recent research has evaluated the demand for continuous forest cover around nest-trees of these species. This article analyses nest-site use by Black Stork and Lesser Spotted Eagle in relation to ground cover, specifi cally comparing the nest-tree environment with availabilities in the forest landscape. Strong avoidance of field, low avoidance of shrubland (clearcuts and forests up to 30 years of age) and preference of continuous forest cover (older than 30 years of age) are characteristic of the Black Stork nest-site use. Nest-sites of Lesser Spotted Eagle in relation to ground cover did not differ from availabilities in the forest landscape, except in the environment nearest to the nest-trees, where eagles preferred continuous forest cover and weakly avoided shrubland. We assume that the relatively low avoidance of shrubland by both species could be related with the present level of forest landscape fragmentation, ongoing adaptation to the fragmented forests, or the importance of a suitable nest-tree with only the immediate surrounding to provide protective cover. Some implications for conservation are discussed.
Keywords: Ciconia nigra, Aquila pomarina, nest-site, preference, forest fragmentation
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