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Zur Richtungsumkehr der Schwingen- und Schwanzmauser vonMuscicapa striata

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Zusammenfassung

Die Großgefieder-Mauser vonMuscicapa striata wurde an 65 Mauserbälgen überprüft. Wie vonG. Diesselhorst gefunden, verläuft der Wechsel der Handschwingen ascendent. Er beginnt aber mit der neunten, nicht mit der äußersten, stark reduzierten zehnten Handschwinge. Diese wird nachgeholt und ist fertig, bevor 7 ausgewachsen ist. Von den Armschwingen mausern die inneren zwei Drittel (9-4) descendent, das äußere Drittel (1–3) ascendent, genau umgekehrt wie bei allen anderen Fliegenschnäppern, die das innere Drittel (9-7) descendent und die äußeren zwei Drittel (1–6) ascendent mausern. Dennoch beginnt die Mauser des Armes bei allen Fliegenschnäppern mit der gleichen Schwungfeder, einer der drei Schirmfedern (s. p. 104)! Die Schwanzmauser vonMuscicapa striata verläuft zentripetal, nicht wie bei den übrigen Muscicapiden zentrifugal.

Die Umkehr der Richtung des Mauserverlaufs mag durch eine einzige Mutation bewirkt worden sein, und eine zentrale Steuerung hat vielleicht einen einzigen Richtungshebel umgestellt und damit zwangsläufig Hand, Arm und Schwanz im gleichen Sinne beeinflußt.

Summary

Reversed wing- and tail-moult inMuscicapa striata

The Spotted Flycatcher,Muscicapa striata, migrates from ist Palearctic breeding grounds to Africa where a moult of the whole plumage takes place.Diesselhorst (1961) has recently shown that in this species, in apparent contrast to all other Passerines, the replacement of the primaries is ascendant, beginning with the outermost functional quill and ending with the innermost one (the first). This is a reversal of the typical passerine sequence. The same author continues “With regard to the moult of the secondaries and tail feathers the material, although somewhat scanty, seems to indicate that in both these feather-tracts the ordinary passerine sequence is reversed. The rectrices appear to be moulted centripetally and the secondaries from a single moult centre represented by the sixth, but this needs confirmation.”

The author of the present paper had the unique opportunity of studying moult-progress in 65 skins kindly lent by the National Museum of S. Rhodesia and in 18 skins from the American Museum of Natural History. In all these specimens there was an ascending moult of the primaries and a centripetal (from without to within) moult of the rectrices. The replacement of the secondaries does not start with the sixth, but just as in other Passerines with the inner group (9 to 7), the so-called tertials as defined byNewton andGadow (Dict. of Birds, p. 957). Six secondaries (9 to 4) are moulted in descending sequence and three secondaries (1 to 3) in ascending sequence. This means a reversal of the order found in all other Muscicapinae, where three secondaries (9 to 7) are moulted in descending and six secondaries (1 to 6) in ascending sequence.

The total reversal of moult-progression may originally have been caused by a single mutation. That mutation may have affected some central regulator which determines the sequence in the replacement of primaries as well as of secondaries and rectrices.

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Stresemann, V. Zur Richtungsumkehr der Schwingen- und Schwanzmauser vonMuscicapa striata . J Ornithol 104, 101–111 (1963). https://doi.org/10.1007/BF01677685

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