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Verhaltensbedingte Isolation zwischen den beiden Rassen des Zebrafinken(Taeniopygia guttata)

Behavioural isolation between the two races of the Zebra Finch (Taeniopygia guttata)

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Zusammenfassung

In einem großen Freiflugraum wurden jeweils acht ♂ und acht ♀ der Festlandrasse (Taeniopygia guttata castanotis) und der Inselrasse (T. g. guttata) des Zebrafinken zusammengebracht und die auftretenden Paarbildungen verfolgt. Im Verlauf des mehr als zweimonatigen Versuchs bildeten sich sieben Paare der Festland- und vier Paare der Inselrasse. Mischpaare wurden nicht beobachtet, obwohl am Ende unverpaarte Vögel nur der jeweils anderen Rasse als potentielle Partner zur Verfügung standen. Auch soziale Interaktionen zwischen den Rassen waren selten. Unter den halbnatürlichen Bedingungen des Experiments verhielten sich die beiden Rassen somit wie zwei getrennte Arten.

Summary

Eight ♂ and eight ♀ each of the mainland (T. g. castanotis) and the island race (T. g. guttata) were kept together in a large outdoor flight cage (22×8×5 m). Over a two months period, the pattern of pair formation was observed. In this time seven pairs of the mainland and four pairs of the island race were formed. No pair-formation was observed between members of the opposite race even though at the end of the experiment unpaired individuals of only the opposite race were available as potential mates. Social interactions between the races were rare. It can be concluded that under the semi-natural conditions of the experiment the two races of the Zebra Finch behaved like separate species.

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Böhner, J., Cooke, F. & Immelmann, K. Verhaltensbedingte Isolation zwischen den beiden Rassen des Zebrafinken(Taeniopygia guttata) . J Ornithol 125, 473–477 (1984). https://doi.org/10.1007/BF01640139

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  • DOI: https://doi.org/10.1007/BF01640139

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