Avtor/Urednik		Potokar, Maja
Naslov		Predselitvena disperzija kmečke lastovke Hirundo rustica v Sloveniji
Prevedeni naslov		Pre-migratory dispersion of barn swallow Hirundo rustica in Slovenia
Tip		članek
Vir		Acrocephalus
Vol. in št.		Letnik 21, št. 102-103
Leto izdaje		2000
Obseg		str. 231-9
Jezik		slo
Abstrakt		The present contribution presents the analysis made on recoveries of first year and adult Barn Swallows Hirundo rustica in Slovenia during 1992-1998. Birds were ringed and recaptured within the same summer. The purpose of this analysis was to establish the following: (a) do these movements occur only amongst first year birds or amongst adult birds as well, (6) which are the direo- tions of movements> (c) is there any preferred direction, (d) what are the distances of movements and (e) if and how the pre-migratory movements change during the summer. The greatest number of recoveries, which indicate certain pre-migratory dispersion, was among first year birds. Some recoveries, which also show pre-migratory dispersion, were made as early as in July; in August the number of these recoveries increased a great deal, while in September the number fell. Dispersion of first year birds was the greatest in August. Statistic analysis (chi square - test) has shown that during the first year Barn Swallows have random movements. Among adult birds there were only a few long distance recoveries during the breeding season. Adults begin to migrate earlier than first year birds. In spite of the fact that their migration starts at the end of August, some recoveries have shown that they can stay in the area of Slovenia until mid-September. Some of these adults probably stayed in the area of Slovenia for a longer period, but it is not known whether they bred there.
Izvleček		V članku je predstavljena analiza najdb prvoletnih in odraslih kmečkih lastovk Hirundo rustica na območju Slovenije med letoma 1992 in 1998. Kmečke lastovke so bile obročkane in ponovno ujete v istem gnezditvenem obdobju. Namen analize je bil ugotoviti: (a) ali se predselitvene disperzije pojavljajo samo pri prvoletnih ali tudi pri odraslih osebkih, (b) v katere smeri letijo, (c) ali jim je katera smer ljubša od drugih, (d) kakšne so razdalje letov, ter (e) ali se med sezono predselitvene disperzije spreminjajo. Največ najdb, ki kažejo na predselitveno disperzijo, je bilo med prvoletnimi osebki. Disperzija prvoletnih osebkov je bila največja v avgustu. Statistična analiza (hi2 - test) je pokazala, da prvoletne kmečke lastovke v različnih smereh preletavajo območje okrog kraja izvalitve. Med odraslimi osebki so bile v času gnezditvenega obdobja na daljših razdaljah samo posamezne najdbe. Odrasli osebki se začnejo seliti prej kot prvoletni, in sicer že konec avgusta, vendar pa so bile najdbe še v septembru. Ne glede na to, da se selitev odraslih prične že konec avgusta, se lahko ti zadržujejo na območju Slovenije še do sredine septembra.
Deskriptorji		BIRDS BEHAVIOR, ANIMAL ECOSYSTEM AGE FACTORS