Analysis of the Structural Organisation of the Large Raptor Community in Remdovsky Reserve
Questions regarding the abundance of raptor nesting population and the objectivity of the applied censusing methods have constantly caused and still cause active discussions in the scientific literature (Ivanovsky, Bashkirov, 2002, etc.). This is especially relevant during the creation of protected...
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Veröffentlicht in: | Pernatyĭe khishchniki 2023-10 (2), p.111-115 |
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Zusammenfassung: | Questions regarding the abundance of raptor nesting population and the objectivity of the applied censusing methods have constantly caused and still cause active discussions in the scientific literature (Ivanovsky, Bashkirov, 2002, etc.). This is especially relevant during the creation of protected areas, where, undoubtedly, the size of nesting territories of “umbrella” species – large birds of prey – should be taken into account at the start. In addition to the theoretical component, this question has practical implications. For example, it is necessary to know the capacity of lands for each species when carrying out biotechnical measures aimed at increasing rare species abundance. When calculating the practical results of censuses and theoretical constructions when extrapolating data, a control group is necessary to assess the completeness and quality of the gathered data. In this case, a forest-wetland-lake region that is part of Europe’s northwest Lakeland. Such a region must meet the following conditions: large in area; containing at least three long-term raptor breeding territories (for Golden Eagles such an area may reach 280 km2), and have been studied by professional ornithologists over a long timescale. There is such an area in Russia’s Pskov Oblast (Sein et al., 2018). Research occurred 2014–2018 on the Remda Peninsula, located between Lake Chudskoye and Lake Pskov – an area of 1,000 km2. Three quarters of the peninsula is covered by different types of wetlands. Sparsely populated by humans, Remda Wildlife Game Refuge is located centrally there. Large raptor abundance was estimated as follows: Golden Eagle (GE, Aquila chrysaetos) – four, White- Tailed Eagle (WTE, Haliaeetus albicilla) – 36, Osprey (Pandion haliaetus) – 64 pairs. GIS software was used to calculate distances between nests of all possible pairs of birds of prey. Because only elementary raptor populations were studied in Remda Game Reserve, where individual birds can move between any breeding territories of their species in different breeding seasons, all possible rectilinear distances between all nests were measured, not only those between nearest nests. Average distances between nests of all eagle pairs obtained during field surveys were calculated and a number of parameters were calculated for all pairs of compared species. Custom software was used to verify that samples of measured actual distances conformed to a range of mathematical distributions. The verification showed that, |
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ISSN: | 1814-0076 1814-8654 |
DOI: | 10.19074/1814-8654-2023-2-111-115 |