Gunnison grouse

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Gunnison sage-grouse

ESA)[2][3]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Phasianidae
Genus: Centrocercus
Species:
C. minimus
Binomial name
Centrocercus minimus
Young, Braun, C, Oyler-McCance, Hupp & Quinn, 2000[4]
Gunnison sage-grouse range[5][6]

The Gunnison grouse, Gunnison sage-grouse or lesser sage-grouse (Centrocercus minimus) is a species of

new species in 2000—making it the first new avian species to be described from the USA since the 19th century.[7] The description of C. minimus as a separate species is supported by a molecular study of genetic variation, showing that gene flow between the large-bodied and the small-bodied birds is absent.[8]

Breeding

Gunnison sage-grouse are notable for their elaborate courtship rituals. Each spring, males congregate on

leks and perform a "strutting display". Groups of females observe these displays and select the most attractive males with which to mate. Only a few males do most of the breeding. Males perform on leks for several hours in the early morning and evening during the spring. Leks are generally open areas adjacent to dense sagebrush
stands, and the same lek may be used by grouse for decades.

Conservation

This species is in decline because of

Endangered Species Act by the United States Fish and Wildlife Service, and was eventually protected as a threatened species starting on December 22, 2014.[2][3][9] The known population size of this species remains quite small, and it was estimated that fewer than 4,000 individuals existed in when the species was successfully protected under the Act. A 2019 survey found the population in Colorado to be reduced to an estimated 1,800 birds with only around 429 reproductive males, a record low for the species since surveys began.[10]

Distribution

Gunnison sage-grouse occur in seven counties in southwestern Colorado and one county in southeastern Utah. It was once found in

extirpated
in those states.

Life cycle

Males gather on the lek or strutting grounds, which are small, open areas where breeding occurs, in late February to April, as soon as the lek is relatively free of snow. Only a few dominant males, usually two, breed. After mating, the hen leaves the lek for the nesting grounds. Clutch size ranges from six to eight eggs; incubation time is 25 to 27 days. Sage-grouse apparently have high rates of nest desertion and nest predation. Chicks are precocial and can feed themselves. [11]

Preferred habitat

Gunnison sage-grouse are totally dependent on sagebrush-dominated habitats. Sagebrush is a crucial component of the adult's diet year-round, and they select sagebrush almost exclusively for cover. However, in order to rear a brood of chicks, the young require high protein broadleaved plants and wildflowers that bring insects, also for protein. However, cattle and sheep also relish these plants, and the removal of these critical chick-food plants is a major reason for this bird's decline.

References

Public Domain This article incorporates public domain material from Centrocercus minimus. United States Department of Agriculture.

  1. doi:10.2305/IUCN.UK.2020-3.RLTS.T22728472A152508115.en
    . Retrieved 13 November 2021.
  2. ^ a b "Gunnison sage-grouse (Centrocercus minimus)". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 27 April 2023.
  3. ^ a b 79 FR 69192
  4. ^ "Centrocercus minimus Young, C. Braun, Oyler-McCance, Hupp & Quinn, 2000". Integrated Taxonomic Information System. Retrieved 27 April 2023.
  5. ^ BirdLife International and NatureServe (2014) Bird Species Distribution Maps of the World. 2012. Centrocercus minimus. In: IUCN 2014. The IUCN Red List of Threatened Species. Version 2014.3. http://www.iucnredlist.org. Downloaded on 30 May 2015.
  6. ^ National Geophysical Data Center, 1999. Global Land One-kilometer Base Elevation (GLOBE) v.1. Hastings, D. and P.K. Dunbar. National Geophysical Data Center, NOAA. doi:10.7289/V52R3PMS [access date: 2015-03-16].
  7. S2CID 20131406
    .
  8. JSTOR 4089344
    .
  9. ^ "Gunnison Sage-grouse". Western State Colorado University. Archived from the original on 23 October 2013.
  10. ^ "Colorado's Gunnison Sage-grouse Populations Plummet to Perilous Lows". Center for Biological Diversity. Retrieved 2019-10-23.
  11. ISBN 0803208103
    .

External links
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