Reed warbler

from Wikipedia, the free encyclopedia
Reed warbler
Reed warbler (Acrocephalus luscinius)

Reed warbler ( Acrocephalus luscinius )

Systematics
Order : Passerines (Passeriformes)
Subordination : Songbirds (passeri)
Superfamily : Sylvioidea
Family : Reed warbler (Acrocephalidae)
Genre : Reed warbler ( Acrocephalus )
Type : Reed warbler
Scientific name
Acrocephalus luscinius
( Quoy & Gaimard , 1830)

The Sprosserrohrsänger or Guamrohrsänger ( acrocephalus luscinius ) is a realization according to the prior IUCN extinct passerine bird from the family of warbler-like (Acrocephalidae). It was endemic to the Mariana Island of Guam .

features

The reed warbler was a relatively large reed warbler that reached a body length of 18 cm. The average weight for the males was 35.9 g and for the females 32 g. The beak was very long and the head plumage was often disheveled. It had a yellow over-eye stripe and a black eye stripe. The skull and the top were rusty brown. The wings of the hand, the wings of the arm, and the tips of the control springs had narrow ocher-brown hems. The underside was light yellow to cream in color. The flanks were brownish-yellow to ocher-brown. The iris was dark. The upper beak was grayish black with yellow edges. The lower beak was flesh-colored with yellow edges. The legs were grayish blue. The sexes were similar in the plumage characteristics, but the males were significantly larger. The juvenile birds are undescribed.

Habitat and way of life

The sprout warbler lived in the sugar cane thickets and the adjacent areas in the fresh and brackish water swamps. Its diet consisted of lizards, snails, spiders as well as insects and their larvae. Little information is available on reproductive behavior. Émile Oustalet wrote in 1895 that nests were found in June 1887, and the NAMRU2 expedition observed two males with enlarged gonads in June 1945 .

status

In 2016 the Sprosserrohrsänger of which was IUCN as "extinct" ( extinct listings). In 1960 it was described as quite common by the ornithologist MH Hartin. Ben King observed several specimens during a three-day visit to Guam in 1962. By early 1968, the species was found in the marshland of the Atantano River. In 1967 or 1968 the reed warbler is said to have occurred quite frequently in the Agana Swamp. The last record was in 1969. In subsequent searches from 1970 onwards, this species could not be rediscovered. Various reasons are given as the causes of its disappearance. These include the conversion of its habitat into agricultural land, fires in the swamp areas, the use of pesticides and, above all, the importation of the brown night tree snake ( Boiga irregularis ) on Guam.

Systematics

For a long time the reed warbler populations of Guam , Saipan and Alamagan were considered to be a taxon Acrocephalus luscinius luscinius . In 2011 Alice Cibois and her colleagues submitted a revision of the Pacific reed warbler , according to which the populations of Saipan and Alamagan were considered to be a separate species of Acrocephalus hiwae . They argue that the Pacific warbler does not form a monophyletic group and that the Guam population, Acrocephalus luscinius luscinius, is outside the main range in the Pacific. The former subspecies nijoi (from Aguijan ), yamashinae (from Pagan ) and astrolabii (origin unknown) were split off as separate species.

literature

  • Rollin H. Baker: The avifauna of Micronesia, its origin, evolution, and distribution. Univ. Can. Publ., Mus. Nat. Hist. 3, 1951: p. 253.
  • James D. Reichel, Gary J. Wiles and Phil O. Glass: Island Extinctions: The Case of the Endangered Nightingale Reed-Warbler. The Wilson Bulletin, Wilson Ornithological Society, Vol. 104, No. 1 (Mar., 1992), pp. 44-54
  • Peter Kennerley, David Pearson: Reed and Bush Warblers. Christopher Helm, 2010, ISBN 978-0713660227 , pp. 457-459.
  • Takema Saitoh, Alice Cibois, Sayaka Kobayash, Eric Pasquet & Jean-Claude Thibault: The complex systematics of the Acrocephalus of the Mariana Islands, western Pacific. Emu 112 (4), June 2012, pp. 343-349

Web links

Commons : Sprosserrohrsänger  - Collection of images, videos and audio files

Individual evidence

  1. ^ Émile Oustalet: Les Mammifères et les Oiseaux des îles Mariannes. Nouvelles archives du Muséum d'histoire naturelle. Paris, ser. 3, 7 (1895): 141-228, 7 pls .; 8 (1896): 24-74.
  2. ^ A b Rollin H. Baker: The avifauna of Micronesia, its origin, evolution, and distribution. Univ. Can. Publ., Mus. Nat. Hist. 3, 1951: p. 253.
  3. ↑ James D. Reichel, Gary J. Wiles and Phil O. Glass: Island Extinctions: The Case of the Endangered Nightingale Reed-Warbler. The Wilson Bulletin, Wilson Ornithological Society, Vol. 104, No. 1 (Mar., 1992), pp. 44-54
  4. ↑ Alice Cibois, Jon S. Beadell, Gary R. Graves, Eric Pasquet, Beth Slikas , Sarah A. Otherwisehagen & Robert C. Fleischer : Charting the course of reed ‐ warblers across the Pacific islands. Journal of Biogeography, 38 (10), 2011: 1963-1975