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Geographical variation in the southern distributional range of the Rufous-tailed Hummingbird,Amazilia tzacatl De la Llave, 1832: a new subspecies from Nariño, southwestern Colombia

Geographische Variation im südlichen Verbreitungsgebiet der Braunschwanzamazilie,Amazilia tzacatl De la Llave, 1832: eine neue Unterart von Nariño, Südwestkolumbien

Summary

The Rufous-tailed Hummingbird (Amazilia tzacatl De la Llave, 1832), a widespread inhabitant of Central America and NW South America, currently comprises two subspecies (A. t. tzacatl andA. t. jucunda). Another taxon of the species complex isA. t. handleyi (Wetmore, 1963), initially described as an allospecies but here regarded only as a subspecies ofA. tzacatl. Based on diverging morphological features, the amount of geographical variation ofA. tzacatl in its South American range suggests the distinction of further populations. As a taxonomical consequence, we recognize the validity ofA. t. fuscicaudata (Fraser, 1840), and describe a new subspecies,A. t. brehmi subspec. nov., from Nariño, Colombia.

Zusammenfassung

Von der in Mittelamerika und in NW-Südamerika weitverbreiteten Braunschwanzamazilie (Amazilia tzacatl) wurden mehrere Unterarten beschrieben, von denen in der neueren Literatur drei anerkannt wurden:A. t. tzacatl (De la Llave, 1832) mit einem Vorkommen von NO-Mexiko bis W-Venezuela einschließlich N-Kolumbiens;A. t. jucunda (Heine, 1863) von W-Kolumbien bis SW-Ecuador; undA. t. handleyi (Wetmore, 1963) als Endemit der Panamá vorgelagerten Isla Escudo de Veraguas (Karibik). Letzteres Taxon wird von einigen Autoren als Allospezies angesehen, hier aber lediglich als Unterart bewertet, da offenbar nur morphometrische Unterschiede zu den übrigen Taxa bestehen. Die Ergebnisse der vorliegenden biogeographisch-taxonomischen Analyse belegen, daß die geographische Variation der Art im südlichen Verbreitungsgebiet größer ist als bislang angenommen wurde. Aufgrund signifikanter Unterschiede in den Gefiedermaßen erhält die kolumbianischvenezuelanische Population ihren früheren, eigenständigen taxonomischen Rang (A. t. fuscicaudata Fraser, 1840) zurück. Ein neues Taxon,Amazilia tzacatl brehmi subsp. nov., wird von Nariño, Südwestkolumbien, beschrieben. Diese Unterart tritt offenbar allopatrisch zuA. t. jucunda auf und unterscheidet sich morphometrisch deutlich von konspezifischen Nachbarpopulationen.

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Weller, AA., Schuchmann, KL. Geographical variation in the southern distributional range of the Rufous-tailed Hummingbird,Amazilia tzacatl De la Llave, 1832: a new subspecies from Nariño, southwestern Colombia. J Ornithol 140, 457–466 (1999). https://doi.org/10.1007/BF01650990

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Key words

  • Geographic variation
  • taxonomy
  • Rufous-tailed Hummingbird
  • Amazilia tzacatl brehmi
  • subspec. nov.
  • Trochilidae