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Merjenje geografske razširjenosti ptic : primerjava empiričnih podatkov na primeru slovenskih gnezdilk
Franc Janžekovič, 2000, original scientific article

Abstract: The author presents six methods for estimating the geographical distribution of birds. The estimates were made on 216 species, all of them probable or confirmed Slovene breeders. Three approaches to the distribution estimates were compared: (1) distance between the most distant nest-sites; (2) surface area of the inhabited territory, (3) the habita's specific features. It was concluded that the results between different methods were more or less related, but that the methods were not fully comparable (equivalent). The distances between the most distant nest-sites, which are measured parallel with latitude and longitude, are not suitable for the surface area covered by Slovene territory. With them, distributions in large areas are usually measured. Estimates of the surface area of inhabited areas or presentations of species' distribution with squares are only approximate and in some cases misleading. Nests or nest-sites, which are in fact points, are usually extrapolated on the 10 x 10 km squares (=100 km2). This is why an accurate geolocation of concrete data must be assured in the preparations for the new mapping of birds
Keywords: ptice, Aves, geografska razširjenost, gnezdilke, Slovenija
Published in DKUM: 10.07.2015; Views: 1343; Downloads: 52
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Odnosi med telesno velikostjo, razširjenostjo in gostoto gnezdečih ptic v Sloveniji
Franc Janžekovič, 2002, original scientific article

Abstract: Through the analysis of empirical data on the breeders of Slovenia, relations between their distribution, abundance and body size were being assessed. Two hypotheses were tested: 1) species with greater distribution have greater abundance than species limited to smaller geographical regions: 2) larger species have lower average abundance than smaller. The relationship between distribution and abundance of the species breeding in Slovenia was in accordance with the exponent growth, while the correlation coefficient was high and positive (R=0,75). Correlation between distribution of species and number of breeding pairs was also significant and positive (R=0,88). Larger species had smaller average abundance and therefore smaller number of breeding pairs than smaller birds. Correlation between body size and abundanceof pairs was negative (r=-0,41). The difference in abundance of pairs between species with larger and smaller body size is presumably the result of different access to natural resources (mainly food). In larger species, the same quantity of limited natural resources is distributed among smaller number of individuals, while in small body size species this quantity is distributed among greater number of birds
Keywords: biologija, zoologija, ornitologija, ptice, Aves, telesna velikost, razširjenost, številčnost, gnezdilke, Slovenija
Published in DKUM: 10.07.2015; Views: 1502; Downloads: 50
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