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Význam ekotonálních společenstev les-bezlesí a jejich charakteristik pro složení ornitofauny
Svoboda, Petr
Ecotonal communities are a specific habitat for a number of different organisms. This bachelor's thesis examines and compares the composition of bird nesting communities in forest-non-forest ecotonal communities and in adjacent forest-no-forest biotopes. Bird community research was carried out in 2021 used three terms of bird censuses at 90 points systematically distributed in 30 selected locations representing the forest-no-forest ecotone with different characteristics. A total of 54 bird species were recorded, 39 species in forest habitats, 3 in forestless habitats and 37 in the forest-forestless ecotone. The most abundant species were the Chiffchaff (Phylloscopus collybita Vieillot, 1817), Chaffinch (Fringilla coelebs Linnaeus, 1758) and the Blackcap (Sylvia atricapilla Linnaeus, 1758). The species composition and diversity of the bird communities differed significantly between the monitored biotopes, with the forestless communities being significantly poorer than the forest and ecotone communities. The bird community of the ecotone was made up of a combination of forest and non-forest species, but it also hosted species specific to the ecotone, such as the Yellowhammer (Emberiza citrinella Linnaeus, 1758), Tree Pipit (Anthus trivialis Linnaeus, 1758) and the Goldfinch (Carduelis carduelis Linnaeus, 1758). The proportion of the forest edge with shrubs was confirmed as the most significant characteristic of the forest-no-forest ecotone with a significant influence on the composition of bird communities, where eight species were confirmed to prefer locations with a higher proportion of shrubs along the forest edge and only two species preferred the ecotone with a minimum of shrubs.
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