Rousserolle effarvatte

Identification

This is a medium-sized warbler, 13 cm (5.1 in) in length with a wing-span of 17–21 cm (6.7–8.3 in). The adult has an unstreaked brown back and buff underparts. The forehead is flattened, and the bill is strong and pointed. The sexes are identical, as with most warblers, but young birds are richer buff below. The common reed warbler looks similar to the great reed warbler, but the great reed warbler is larger in size and has a stronger supercilium.<p>The song is a slow, chattering jit-jit-jit with typically acrocephaline whistles and mimicry added.

Taxonomie

The common reed warbler was formally described in 1804 by the French naturalist Johann Hermann under the binomial name Turdus scirpaceus. The type locality is Alsace. The common reed warbler is now one of around 40 species placed in the genus Acrocephalus that was introduced by Johann Andreas Naumann and his son Johann Friedrich Naumann in 1811. The genus name Acrocephalus is from Ancient Greek akros, "highest", and kephale, "head". It is possible that the Naumanns thought akros meant "sharp-pointed". The specific scirpaceus is from Latin and means "reed".<p>Ten subspecies are recognised:<p>An older scientific name for the reed warbler was Acrocephalus streperus (Vieill.).<p>The mostly resident Iberian and African subspecies are sometimes treated as a separate species, the African reed warbler (Acrocephalus baeticatus).

Nom scientifique

Acrocephalus scirpaceus

Autorité

(Hermann, 1804)

Ordre

Passériformes

Famille

Acrocephalidae

Genre

Acrocephalus

Répartition et habitat

This small passerine bird is a species found almost exclusively in reed beds, usually with some bushes. They can also be found in damp scrub.

Aire de reproduction

PAL, AF : Europe to c Asia, Arabian Pen., n Africa and Sub-Saharan Africa

Aire hors reproduction

c AF

Migration

Complete migrants

Comportement

Like most warblers, it is insectivorous, but will occasionally take plant material such as berries.<p>The males return to the breeding grounds two or three weeks before the females. The species is usually monogamous. The first eggs are laid at the end of April. The nest is usually placed in vegetation over water, especially in reeds of the genus Phragmites. The deep cylindrical cup nest is sited on average 65 cm (26 in)—range is between 20 and 140 cm (7.9 and 55.1 in)—above the surface of the water and is built entirely by the female. She takes four days to build the initial cup of grass, reed stems and leaves, and another three days to complete the lining of finer material including hair. The clutch contains three to five eggs that are laid daily. The eggs are very pale green with speckles and blotches of olive green or grey. On average they measure 18.4 mm × 13.6 mm (0.72 in × 0.54 in) and weigh 1.75 g (0.06 oz). They are incubated by both parents, beginning after the penultimate egg is laid. Only the female incubates at night. The eggs hatch after 9–12 days. The nestlings are fed and cared for by both parents. They fledge after 10–12 days but continue to be fed by their parents for another 10–14 days. Up to one third of pairs raise a second brood.<p>The common reed warbler is one of the species that are brood parasitised by the common cuckoo.

Conservation

Tendance de la population

stable