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Autor(en)
Klemp, S.
Titel
Extraterritoriale Aktionsräume bei der Bergstelze Motacilla cinerea während der Brutzeit.
Jahr
2004
Band
101
Seiten
219–232
Key words
(von 1994 bis 2006 vergeben)
Motacilla cinerea, home range size, territory size, extraterritorial forays, extraterritorial home ranges, food availability
Schlagwort_Inhalt
Aktionsraum, Kerngebiet, Gesangsrevier, Reviergrösse, Nahrungsangebot, Nahrungssuchverhalten, Verpaarung, Nestlingsperiode
Schlagwort_Vogelart
(wissenschaftlich)
Motacilla cinerea
Schlagwort_Vogelart
(deutsch)
Bergstelze
Schlagwort_Geogr.
Trueb, Oberemmental, Bern
Sprache
deutsch
Artikeltyp
Abhandlung
Abstract
Extraterritorial home ranges of Grey Wagtails Motacilla cinerea during the breeding season. – Many avian species are territorial during the breeding season, but activity of territory owners is not restricted to the territory. Due to methodical difficulties only few studies have addressed, however, questions concerning such extraterritorial activities (except during short intrusions into neighbouring territories). Here I present data on space use of radio-tracked Grey Wagtails Motacilla cinerea from Switzerland. Four males could be radio-tracked for three weeks during the period of territory acquisition; further six males and five females (from eight pairs during their first broods) during both the nestling and post-fledging period. Home range sizes varied between 2.3 ha in the nestling period and 5.9 ha during post-fledging parental care (Tab. 1). Only 1.6–2.1 ha of these ranges were regularly used (>5 bearings / 0.25 ha, core area) and only 1.4 ha were defended as song territories. Territories did not fully overlap with core areas during territory acquisition and were visited by the territory owners only sporadically on some days. Thus, only 36–87 % of bearings lay within the territories. Extraterritorial activities focused mainly on small streams, which were not used as breeding sites, while territories were established along the larger water courses. Extraterritorial ranges were used exclusively for foraging, most frequently during the period of territory acquisition (Fig. 3, 4) and after fledging (Fig. 5). After periods of high water level (which reduce food availability) at the breeding site soon after fledging more families left their territories and foraged at adjacent small streams. Therefore, home ranges of territorial avian species can be much larger than revealed by sightings alone, since these succeed predominantly within territories. In the Grey Wagtail extraterritorial ranges are used alternatively or in addition to the territory mainly during periods of food shortage (cold days after arrival, high water levels) and, thus, contribute to overall home range quality.
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