Avtor/Urednik		Janžekovič, Franc
Naslov		Merjenje geografske razširjenosti ptic - primerjava empiričnih podatkov na primeru slovenskih gnezdilk
Prevedeni naslov		Estimates of the geographical distribution of birds - a comparison of empirical data as in the case of Slovene breeders
Tip		članek
Vir		Acrocephalus
Vol. in št.		Letnik 21, št. 102-103
Leto izdaje		2000
Obseg		str. 249-59
Jezik		slo
Abstrakt		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 habitat'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 con- crete data must be assured in the preparations for the new mapping of birds.
Izvleček		Predstavljam šest metod merjenja geografske razširjenosti ptic. Meritve sem opravil na 216 vrstah, verjetnih in potrjenih gnezdilkah v Sloveniji. Primerjal sem tri pristope k merjenju in ocenjevanju razširjenosti: (1) razdaljo med najbolj oddaljenima gnezdiščema; (2) površino naseljenega ozemlja; (3) habitatsko specifičnost. Ugotovil sem, da so rezultati med metodami povezani, vendar metode niso v celoti primerljive (ekvivalentne). Razdalje med najbolj oddaljenima gnezdiščema, ki jih merimo vzporedno z geografsko širino in dolžino, niso primerne za velikost slovenskega ozemlja. Z njimi navadno merimo razširjenost na velikih območjih. Merjenje površine naseljenega območja ali podajanje razširjenosti vrste s kvadrati je približno in v nekaterih primerih zavajajoče. Navadno so gnezda ali gnezdišča, ki so dejansko točke, ekstrapolirana na površino kvadrata 10 x 10 km (= 100 km2). Zato je v pripravah novih kartiranj ptic treba zagotoviti natančno geolokacijo konkretnih podatkov.
Deskriptorji		BIRDS ECOSYSTEM POPULATION DENSITY NESTING BEHAVIOR SLOVENIA