Genetic differentiation, geographic variation and hybridization in gulls of the Larus glaucescens-occidentalis complex

Article Abstract:

Larus glaucescens and Larus occidentalis go through a number of episodes of secondary contacts and separation, during which hybridization occurs but fails to swamp either species. Human-induced habitat alteration may be responsible for the genetic diversity in L. glaucescens. The populations of the L. glaucescens-occidentalis complex are sexually dimorphic, and the hybrid zone may be a possible barrier to gene flow. This zone is present from Juan de Fuca Strait, Washington, south to Coos Bay, Oregon. Hybrids have more genetic similarities with L. glaucescens.

Analysis, Environmental aspects, Evolution (Biology), Geography, Origin of species

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Hybridization and reproductive performance in Gulls of the Larus glaucescens-occidentalis complex

Article Abstract:

Information on the distribution of morphotypes, mate choice and reproductive performance in Glaucous-winged Gull and Western Gull were compared with sympatric members of the Larus Glaucescens-Occidentalis mate. Most backcrossing involves gulls that are close in phenotype to pure parentals. Selection-hybridization best described Larus Glaucescens-Occidentalis hybrid zone, wherein hybrids experience greater reproductive fitness.

Animal reproduction

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A new hybrid warbler (Dondroica nigrescens x D. occidentalis) and diagnosis of similar D. townsendi x D. occidentalis recombinants

Article Abstract:

Research is presented concerning the use of 13 color characters to describe Dendroica nigrescens, Dendroica occidentalis, hybrid birds and recombinants. The hybridization of these warblers is discussed.

Behavior, Wood warblers

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