- Sierra Madre Sparrow
__NOTOC__Taxobox
name = Sierra Madre Sparrow
status = EN
status_system = iucn3.1
regnum =Animal ia
phylum =Chordata
classis =Aves
ordo =Passeriformes
familia =Emberizidae
genus = "Xenospiza"
genus_authority = Bangs,1931
species = "X. baileyi"
binomial = "Xenospiza baileyi"
binomial_authority = Bangs, 1931
synonyms =
* "Ammodramus baileyi"
* "Xenospiza baileyi baileyi"
* "Xenospiza baileyi sierrae" Pitelka,1947 The Sierra Madre Sparrow ("Xenospiza baileyi" [
Etymology : "Xenospiza", fromAncient Greek "xénos" (ξένος), "a stranger", + "spíza" (σπίζα), "finch". "baileyi", dedicated toAlfred H. Bailey , who collected the 1931 specimen for Bangs.] )is an endangered, range-restricted, enigmaticAmerican sparrow endemic to some mountain ranges in and near theSierra Madre Occidental ,Mexico . It is threatened withextinct ion due tohabitat loss.It is the sole species in the
genus "Xenospiza"; the genus is closely related to "Ammodramus " (and included in it by some authors), differing mainly in the longer, less pointed tail, and restriction to high altitude alpine grassland habitats.The Sierra Madre Sparrow was first discovered by scientists in the
Sierra de Bolaños nearBolaños ,Jalisco , in 1889. The eight specimens shot then were not recognized as what they were, but believed to be aberrant Savannah or Mexican Plateau Song Sparrows, or hybrids. Only when another bird was taken near the city of Durango in 1931 was it recognized as a valid and distinctspecies . The southern population was discovered only in 1945, but has been observed since then in several areas around Distrito Federal,Morelos , andEstado de México . Between 1951, when 5 were taken near El Salto, and 2004, when a small population was rediscovered in the same area, the northern population from Jalisco andDurango states was not found and believed to have disappeared. Meanwhile, the proposedsubspecies "X. b. sierrae" for the southern population was recognized to be based on individual variation and hence invalid; nonetheless, there is nogene flow between the populations and they constitute two separate ESUs.Ecology
The species is restricted to bunchgrass and marshland habitat in volcanic mountain ranges, at altitudes of 2,300-3,050 m; the lower part of the range is occupied by the northern, and the higher part by the southern population. Habitat information for the northern population is unfortunately scant, with
pine ,oak , and "Arbutus " (probablyArizona Madrone , "A. arizonica") trees being mentioned. Better details are available for the more extensively studied southern population. The dominant bunchgrass species are "Festuca amplissima ",Peruvian feather grass ("Stipa ichu "), amuhly grass ("Muhlenbergia affinis "), and "Muhlenbergia macroura ". Small woods ofMontezuma Pine ("Pinus montezumae ") and (probably)Lumholtz' Pine ("P. lumholtzii") occur on elevated terrain.It is highly threatened due to clearance of its habitat for creating
pasture s. Its conservation status according to theIUCN is EN B1ab(i,ii,iii,v). This basically means that the species occurs on less than 5000 km², and that its range, avaiolable habitat, and population size are shrinking (BirdLife International 2004). Nonwithstanding the rediscovery of the northern population, no more than a handful of individuals are known to remain, and further research to locate additionalsubpopulation s is urgently needed. In any case, the species will probably be uplisted toCritically Endangered soon; of the 4 subpopulations known, only one (nearLa Cima ) seems reasonably numerous.ong
The distinctive song of this bird can be heard at the following external link:
* [http://www.xeno-canto.org/sounds/uploaded/ILUHRFXDNU/Sierra%20Madre%20Sparrow.mp3 Sierra Madre Sparrow.mp3]References
*|year=2004|id=23134|title=Xenospiza baileyi|downloaded=23 July 2006 Database entry includes justification for why this species is endangered.
* (1995): "Sparrows and Buntings: A Guide to the Sparrows and Buntings of North America and the World". Houghton Mifflin, Boston. ISBN 0395738733
* (2006): A survey for the Sierra Madre Sparrow ("Xenospiza baileyi"), with its rediscovery in the state of Durango, Mexico. "Bird Conservation International" 16(1): 25–32. doi|10.1017/S0959270905000687 (HTML abstract)Footnotes
External links
* [http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=8999&m=0 BirdLife species factsheet] . Retrieved 2006-JUN-11.
* [http://www.birdlifeforums.org/WebX?233@43.zqoWaA1Jdgj.3@.2cba491f/4!enclosure=.2cba5536 Distribution of southern subpopulations] . Map with Spanish captions. Retrieved 2006-JUN-11.
Wikimedia Foundation. 2010.