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Hybridisation in gulls

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Nesting Western x Glaucous-winged gull hybrid, colloquially known as the "Olympic Gull".

Hybridisation in gulls occurs quite frequently, although to varying degrees depending on the species involved.

Hybrid large white-headed gulls

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  • Herring gulls and lesser black-backed gulls interbreed to a limited degree where their ranges overlap, producing birds of intermediate appearance, which could be confused with yellow-legged gull.[citation needed] In North America, this combination is often known as "Appledore gull".
  • Western gulls and glaucous-winged gulls hybridise extensively in western North America between Washington and Oregon. This particular hybrid is sometimes known as the "Olympic gull", or "Puget Sound gull".[1] The persistence and backcrossing of hybrids is believed to be due to hybrid superiority, where hybrids exhibit higher evolutionary fitness than parent species in the hybrid zone. [2]
  • Great black-backed gulls and herring gulls have hybridized in eastern North America, particularly the Great Lakes. This hybrid is sometimes known as "Great Lakes gull".
  • Herring gulls and glaucous gulls hybridise in Greenland, Iceland and Alaska. The offspring have been termed "Nelson's gull",[3] but are sometimes also known as "Viking gull".
  • Herring gulls and glaucous-winged gulls hybridize extensively in southern Alaska. The offspring are sometimes termed "Cook Inlet gull".
  • Glaucous-winged gulls and glaucous gulls hybridize in western Alaska. These hybrids are sometimes called "Seward gull".
  • Herring gulls and kelp gulls have hybridized in Louisiana. This combination has been termed "Chandeleur gull". This hybrid is interesting as Louisiana is outside of the normal breeding range of both parent species.
  • Glaucous-winged Gull and Slaty-backed Gull hybridize in western Alaska and possibly eastern Siberia. A name for this combination has been emerging as "Commander" Gull, after the Commander Islands off of eastern Russia. Some speculate most Glaucous-winged Gulls wintering in Asia have hybrid origins.
  • It is believed by some that the Kumlien's race of the Iceland gull may be a hybrid population between Iceland gulls and Thayer's gulls. No pure Thayer's gulls are known to occur within the range of Kumlien's although many Kumlien's within their range are almost indistinguishable from Thayer's gulls, while others look like pure Iceland gulls with a range of variation in between.

Hybrids among the smaller gulls

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See also

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References

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  1. ^ Steve N. G. Howell, Jon Dunn (2007). A Reference Guide to Gulls of the Americas. Houghton Mifflin Harcourt. p. 479. ISBN 978-0618726417.
  2. ^ Good, Thomas P.; Ellis, Julie C.; Annett, Cynthia A.; Pierotti, Raymond (2000). "Bounded Hybrid Superiority in an Avian Hybrid Zone: Effects of Mate, Diet, and Habitat Choice". Evolution. 54 (5): 1774–1783. doi:10.1111/j.0014-3820.2000.tb00721.x. ISSN 0014-3820. PMID 11108604.
  3. ^ Malling Olsen, Klaus and Hans Larsson (2003) Gulls of Europe, Asia and North America Helm Identification Guides ISBN 0-7136-7087-8, page 193-4
  4. ^ Tarrant, Mike (2002) An apparent hybrid gull in Lincolnshire Birding World Vol. 15 No. 6 p247
  5. ^ Gillon, Keith (2006) An apparent hybrid gull at Belhaven Bay, Lothian Birding Scotland Vol. 9 No. 2 p92
  6. ^ Charles, D. (2008) Ring-billed Gull breeding with Common Gull on Copeland Islands Co. Down. The first confirmed breeding record for Ring-billed Gull in the Western Palearctic. Northern Ireland Bird Report xviii p. 122.
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