Ashy-throated parrotbill

Ashy-throated parrotbill
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Sylviidae
Genus: Sinosuthora (but see text)
Species: S. alphonsiana
Binomial name
Sinosuthora alphonsiana
(J.Verreaux, 1870)
Synonyms

Suthora alphonsiana J.Verreaux, 1870
Paradoxornis alphonsianus

The ashy-throated parrotbill, (Sinosuthora alphonsiana), is a parrotbill. In old sources, it may be called Alphonse's crow-tit; though superficially resembling a tit it is not a member of the Paridae. The native range of this species extends from south-west China to northern Vietnam, and it might have become naturalised in one area in Italy.[1]

Description and systematics

This is a medium-sized tawny-coloured parrotbill with the large bill typical of these birds. The specific epithet commemorates the French ornithologist Alphonse Milne-Edwards.

Formerly placed in a distinct parrotbill family Paradoxornithidae or with the Old World babblers in the Timaliidae or the tits and chickadees in the Paridae, they are now included with the typical warblers (Sylvia) in the Sylviidae.[2]

They might be less close to the great parrotbill (Conostoma oemodium) – which was also in the "Paradoxornithidae" – than to Chrysomma, or to the fulvettas (Fulvetta) which were often included in the wastebin genus Alcippe. Another relative might be the wrentit (Chamaea fasciata), the only known American member of the Sylviidae in the modern circumscription. The former two, and occasionally also the wrentit, were traditionally considered Old World babblers.[3]

Together with the other lineages of parrotbills, these and the golden-breasted fulvetta (Lioparus chrysotis) and white-browed Chinese warbler (Rhopophilus pekinensis) form an Asian counterpart to the westward radiation of the typical warblers. Rather than two genera – Paradoxornis and the monotypic Conostoma –, the parrotbills are better considered several independent lineages which show pronounced convergent evolution, due to adaptation to reedbed habitat and a more granivorous diet than their skulking warbler-like ancestor. In this case, the ashy-throated parrotbill would probably be assigned to genus Sinoparadoxornis.[3]

Lago di Varese (front) and Lago di Comabbio, with the Brabbia Swamp Nature Reserve left of center

Possible naturalisation in Italy

A population of parrotbills was first discovered in northern Italy in 1995, at the Riserva naturale Palude Brabbia (Brabbia Swamp Nature Reserve), between Cazzago Brabbia on Lago di Varese and Varano Borghi on Lago di Comabbio. In March 1998, 21 individuals were captured and photographed, and provisionally identified as ashy-throated parrotbills. It is not entirely clear, however, whether the birds are indeed S. alphonsiana, its close relative the S. webbiana (vinous-throated parrotbill), both species, or even hybrids between them (as are known from their natural range). While they do not seem to be brown-winged parrotbills (S. brunnea, another close relative), certain identification to species may be impossible without analysis of both nDNA and mtDNA sequence data.[4]

The population is believed to originate from birds escaping from a nearby bird-trader. By 1999, the number of birds in the swamp had grown to at least a hundred individuals; in December 1998, the parrotbills were also observed in two localities on the Lago di Varese. By the early 21st century, the birds are well-established as resident breeders. They are the only self-sustaining parrotbill population found in Europe, as it was discovered that the bearded reedling (Panurus biarmicus) – long believed to be an aberrant parrotbill – is actually a distinct lineage with no known relatives among the Passerida.[5]

Ecology

Contrary to their western Eurasian relatives (the typical warblers), these East Asian birds are small omnivores adapted to living in reed beds. In its native range, the ashy-throated parrotbill inhabits bamboo stands and areas with tall grasses. The parrotbills in Brabbia Swamp Nature Reserve inhabit common reed (Phragmites australis) beds and drier land overgrown with meadowsweet (Filipendula ulmaria), grey willow (Salix cinerea) and giant goldenrod (Solidago gigantea).[4]

It feeds on arthropods, seeds and buds; in winter, the Italian birds seem to sustain themselves on insects that hibernate in reed stalks. As in its relatives in (sub)genus Sinoparadoxornis, its eggs are small by parrotbill standards, whitish- to light-blue and unspotted.[6]

This bird will disappear if wetlands are drained, but its range is considerable and much of its habitat is remote and little accessed. It is thus considered a Species of Least Concern by the IUCN.[7]

Footnotes

  1. ↑ Bangs (1932), Robson (2007), BLI (2008)
  2. ↑ Alström et al. (2006), Jønsson & Fjeldså (2006), Robson (2007)
  3. 1 2 Cibois (2003), Alström et al. (2006), Jønsson & Fjeldså (2006), Pasquet et al. (2006), Yeung et al. (2006)
  4. 1 2 Boto et al. (1999)
  5. ↑ Boto et al. (1999), Alström et al. (2006), BLI (2008)
  6. ↑ Boto et al. (1999), Walters (2006), Robson (2007)
  7. ↑ BLI (2008)

References

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