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Composition and seasonality of mixed-species flocks of insectivorous birds

Autor: Erich Willems Mi, 06.03.2019 - 19:53;
TitelComposition and seasonality of mixed-species flocks of insectivorous birds
MedientypJournal Article
Jahr der Veröffentlichung1990
AutorenDean, S.
JournalNotornis
Volume37
Problem1
Veröffentlichungsdatum1990
Zusammenfassung

Mixed-species flocks of insectivorous birds were investigated at Kowhai Bush, Kaikoura, in monthly transect counts between July 1986 and June 1988. Four native species (Brown Creeper, Silvereye, Greg Warbler and Fantail) and two introduced species (Chaffinch and Redpoll) foraged in mixed flocks. Brown Creepers and Silvereyes appeared to behave as nuclear species by determining the direction of movement of mixed flocks. Mixed flocks were found throughout the day. The mean number of species per flock was 2.5 and the mean number of birds in flocks was 8.5. Mixed flocks were seasonal with none encountered during the main breeding period (Sep-Dec).

Greene (1982) found that Yellow-crowned Parakeets (C. auriceps) preferred to forage in mixed flocks whereas Red-crowned Parakeets (C. novaezelandiue) foraged mainly in single-species flocks. Yellow-crowned Parakeets were in mixed flocks in autumn and winter.
'Es spielt keine Rolle, wie schön deine Theorie ist. Es spielt keine Rolle, wie klug du bist. Passt sie nicht zu den experimentellen Ergebnissen/Beobachtungen, dann ist sie falsch!'. {nach Richard Feynman, Nobelpreis für Physik 1965}