[order] Passeriformes | [family] Sylviidae | [latin] Sylvia deserticola | [UK] Tristrams Warbler | [FR] Fauvette de l'Atlas | [DE] Atlasgrasmücke | [ES] Curruca de Tristram | [IT] Bigia del deserto | [NL] Atlasgrasmus

Atlasgrasmus determination

copyright: Eldert Groenewoud

Close in size to Subalpine Warbler (but with 15% shorter wings) and Spectacled Warbler (but with 10% longer tail); less attenuated than Dartford Warbler, with 15% shorter tail. Small warbler, with small bill, rather high crown, short wings, and slim tail. ( mainly grey above, with bright orange-brown edges to black-centred inner wing-feathers; pink-buff to vinous-brown below. ) and juvenile grey-brown above and paler buff below, with whitish chin and moustachial stripe. Eye yellow to brown, set in whitish eye-ring.

Breeds in lower middle latitudes in Mediterranean and steppe-desert zones, in hilly areas covered with scrub and in poorest forests of holm oak where more bushy conditions occur. In Atlas mountains of Morocco, inhabits bushes between large well-spaced cedars which occur above 1600 m; also in relatively dense shrub cover of juniper, Cistus, Buxus, Pistacia, etc. Winters in Morocco in lower and more open bushy habitats, even to desert fringes, including oases, saline areas, and river beds.

It is a species of Old World warbler in the Sylviidae family. It is found in Algeria, Libya, Mauritania, Morocco, Tunisia, and Western Sahara.

Chiefly insects. Habits similar to Dartford Warbler: explores bushes, daintily hopping from twig to twig, and also forages among clumps of grass.

This species has a large range, with an estimated global Extent of Occurrence of 880,000 km². The global population size has not been quantified, but it is believed to be large as the species is described as 'common' in at least parts of its range (Urban et al. 1997). Global population trends have not been quantified, but the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e. declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern. [conservation status from birdlife.org]

In bush, 1-1.5 m above ground. Nest: deep cup of coarse grasses lined with finer grasses and plant down and sometimes horse hair. Clutch: 3-5. (No information on incubation and fledging periods.)

Partial migrant, making altitudinal and mainly short-distance movements, occasionally reaching southern edge of Sahara. Some birds present mid-winter in breeding range.