Ashy Storm-petrel

Ashy Storm-petrel

Taxobox
name = Ashy Storm-petrel



image_width = 220px
status = EN
status_system = iucn3.1
regnum = Animalia
phylum = Chordata
classis = Aves
ordo = Procellariiformes
familia = Hydrobatidae
genus = "Oceanodroma"
species = "O. homochroa"
binomial = "Oceanodroma homochroa"
binomial_authority = (Coues, 1864)

The Ashy Storm-petrel ("Oceanodroma homochroa") is a small, scarce seabird of the storm-petrel family Hydrobatidae. It breeds colonially on islands of the coasts of California and Mexico, and is one of 6 species of storm petrel that live and feed in the rich California Current system. Both its common and scientific name [Etymology: "homochroa", "uniformly colored". From Ancient Greek (h)omoia ("όμοια"), "alike" + "chroma" ("χρώμα") "color".] come from its colouration, one authorityFact|date=October 2007 has suggested naming it Coues's Storm Petrel after the man that described the species, Elliott Coues.

Description and ecology

This is a small, uniformly sooty-brown storm petrel with a forked tail, closely resembling the Black Storm-petrel, however it is smaller and has a more fluttering style of flight, with the upstroke only becoming horizontal to the body before beginning the downstroke (other storm-petrels in its range have a higher upstroke).

It is a gregarious bird at sea, feeding nocturnally on cephalopods, fish (particularly the deep sea myctophids, which rise to the sea's surface at night) and euphausiid krill such as "Thysanoessa spinifera" (which also swarm at the surface). They will also attend fishing vessels for the fish oils released when the nets are pulled.

Ashy Storm-petrels nest in rock burrows on offshore islands, returning to the nests at night. The species has a long breeding cycle, laying eggs in May and fledging in October, although timing varies greatly, more so than in most other storm-petrels: some pairs may have a chick that is half grown when other pairs are still laying. Like in many other seabirds, pairs show both mate and site fidelity, mating in the same pair with the same mate for many years and nesting at the same burrow, despite the pairs spending their lives out of the breeding season separate from each other, and despite the fact that many individuals might seem to compete for burrows at the nesting colonies. A change in mate is usually associated with a change in nesting site.

The Ashy Storm-petrel is a long-lived bird, a banded individual has been recorded living at least 31 years. [USGS (2006)]

Distribution and Status

Ashy Storm-petrel breeds on 17 islands in the northeast Pacific, principally off California, but also northwestern Mexico. Half the world's population nests on the Farallon Islands, off San Francisco, other breeding islands include the 8 Channel Islands of California (San Miguel Island, Santa Cruz Island, Anacapa Island, Santa Barbara Island, Santa Catalina Island and San Clemente Island), and a small population on Mexico's Coronados. Outside of the breeding season it is believed to be more widely distributed, foraging on the California Current, but undertakes no large migration and doesn't range as far as other species of storm-petrel. In the early fall large flocks can be seen in Monterey Bay. The birds do not range inland by any significant measure except when storm-blown; for example a record for San Mateo County, California was considered "unusual" by an experienced naturalist [Littlejohn (1916)] .

The world population is estimated to be around 10,000 birds, 8,000 of them breeders, the Farallon population having declined by one third between 1972 and 1992. The species is considered has recently been listed as endangered and is a species of conservation concern in California. It is threatened by Western Gull and Burrowing Owl predation, illumination from fishing boats, introduced predators such as rats and feral cats, and pollution. Most of the islands that it breeds on are covered by some degree of protection.

Footnotes

References

* (1995): Ashy Storm-Petrel ("Oceanodroma homochroa"). "In:" aut|Poole, A. & Gill, F. (eds.): "The Birds of North America": 185. Academy of Natural Sciences, Philadelphia, PA & American Ornithologists' Union, Washington, D.C. Online version. DOI|10.2173/bna.185 (requires subscription)
*|year=2007|id=15044|title=Oceanodroma homochroa|downloaded=25 October 2007
* (2004): "Albatrosses and Petrels across the World". Oxford University Press, Oxford, New York. ISBN 0-19-850125-0
* (1916): Some unusual records for San Mateo County, California. Abstract in: aut|Cooper Club: Minutes of Cooper Club Meetings. "Condor" 18(1): 38-40. [http://elibrary.unm.edu/sora/Condor/files/issues/v018n01/p0038-p0040.pdf PDF fulltext] [http://elibrary.unm.edu/sora/Condor/files/DJVU/v018n01/P0038-P0040.djvu DjVu fulltext]
* (2006): Patuxent Wildlife Research Center - [http://www.pwrc.usgs.gov/BBL/homepage/long0010.htm Grebes, Loons, Alcids, Gulls, Terns, Albatross and other tubenoses, Cormorants and related species, AOU Numbers 001.0-128.0 Longevity Records] . Version of July, 2006. Retrieved 2006-SEP-4.

External links

* [http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=3987&m=0 BirdLife International: Ashy Storm-petrel]


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Ashy Storm Petrel — Conservation status Endangered (IUCN 3.1 …   Wikipedia

  • ashy storm-petrel — peleninis audrašauklis statusas T sritis zoologija | vardynas atitikmenys: lot. Oceanodroma homochroa angl. ashy storm petrel vok. Kalifornienwellenläufer, m rus. пепельная качурка, f pranc. océanite cendré, m ryšiai: platesnis terminas –… …   Paukščių pavadinimų žodynas

  • Storm-petrel — Taxobox name = Storm petrels image width = 250px image caption = Wilson s Storm Petrel regnum = Animalia phylum = Chordata classis = Aves ordo = Procellariiformes familia = Hydrobatidae familia authority = Mathews, 1912 subdivision ranks = Genera …   Wikipedia

  • Guadalupe Storm Petrel — Illustration from 1907 Conservation status …   Wikipedia

  • Guadalupe Storm-petrel — Taxobox name = Guadalupe Storm petrel status = PE status system = iucn3.1 regnum = Animalia phylum = Chordata classis = Aves ordo = Procellariiformes familia = Hydrobatidae genus = Oceanodroma species = O. macrodactyla binomial = Oceanodroma… …   Wikipedia

  • Pétrel-tempête — Hydrobatinae Hydrobatinés : océanites ou pétrels tempête …   Wikipédia en Français

  • Pétrel tempête — Hydrobatinae Hydrobatinés : océanites ou pétrels tempête …   Wikipédia en Français

  • List of birds of Ecuador — This is a list of the bird species recorded in Ecuador. The avifauna of Ecuador includes a total of 1663 species, of which 16 are endemic, 2 have been introduced by humans, and 19 are rare or accidental. 77 species are globally threatened.This… …   Wikipedia

  • Sibley-Monroe checklist 9 — The Sibley Monroe checklist was a landmark document in the study of birds. It drew on extensive DNA DNA hybridisation studies to reassess the relationships between modern birds. Ciconiiformes (continued)Podicipedidae* Rollandia rolland White… …   Wikipedia

  • List of United States birds — This list of United States birds is a comprehensive listing of all the bird species known from the United States as of July, 2008. It does include species recorded in all 50 states.Continental United States birds most closely resemble those of… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”