Brauengrasschlüpfer

Bestimmung

The grey grasswren is a small bird with a length ranging between 18 and 20 cm, a wing span of approximately 21 cm and a weight between 15 and 23 g. Its general colour is ginger-brown suffused with grey and off-white striations. Schrodde and Christidis recorded that "the face is patterned black and white with broad white superciliary stripe and black stripe from lores through eyes linked to thin black malar line around sides of throat; tail greatly attenuated with tapered rectrices, the center pair of which extend &gt; 5mm beyond the adjacent pair; no sexual dimorphism in colour of flanks or belly". Juvenile color is duller although similar to the adults and with no distinct facial pattern. Moult is poorly understood but thought to occur annually after breeding and between October and December.<p>Favaloro and McEvey described the call of the grey grasswren as a soft double-syllable note which the bird tweeted persistently. Joseph also noted that calls were given constantly over several minutes with a series of three or four high pitched metallic notes, sounding like pit-choo. Carpenter described the call as a high pitched sit-sit-sit.

Taxonomie

The grey grasswren is classified in the family Maluridae which comprises five genera of birds that are found only in Australia and New Guinea.<p>Two subspecies are recognized:

Wissenschaftlicher Name

Amytornis barbatus

Autorität

Favaloro & McEvey, 1968

Ordnung

Passeriformes

Familie

Maluridae

Gattung

Australische Dornschlüpfer

Verbreitung und Lebensraum

The grey grasswren occupies a restrictive area of arid inland floodplains of central Australia. Sightings have occurred at the Bulloo Overflow in the New South Wales/Queensland border area, lower Cooper Creek, along the Kallakoopah anabranch of the Diamantina River and the overflow areas of lakes Machattie, Koolivoo and Mipea on Eyre Creek in South Australia.These birds frequent mainly floodplains of the above systems which contain areas dominated by lignum and cane grass on major drainage lines between resident sand dunes. In some swampy areas, a dense understory of spike-rush, channel millet, and sedges are present. The grey grasswren has also been known to occupy open vegetative areas well beyond the lignum swamps which are less subject to inundation during flood events. It appears that in drought years the grey grasswren occupies tall dense lignum as a refuge while in normal years it prefers other habitats. Hardy recorded significantly more captures in declared drought years than in normal years.<p>During 2011, an extensive grey grasswren survey was conducted at Frome Swamp in New South Wales which had recently experienced substantial rainfall and resultant lignum and cane grass growth. Despite the use of exhaustive surveys using mist netting, playback, vocal and visual methods, no grey grasswrens were located. This result could suggest that the species may be nomadic, an observation previously made by Hardy arising from his surveys in 2002 and 2003 at another location.

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Schutzstatus

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