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- W2319703186 abstract "We describe two hybrid zones between Hermit Warblers (Dendroica occiden- talis) and Townsend's Warblers (D. townsendi) in Washington, and introduce a third zone in Oregon. To quantify phenotypes, we scored eight standardized characters in each age class and summed them to form a hybrid index score. Because no linear geographic feature de- limits the hybrid zones between these warblers, we sampled the forests of Washington in a grid-like fashion to define the shape of the zones. For both Washington zones, the shape of the character-transition curves for the hybrid index suggests asymmetries in gene flow, with Townsend's-like phenotypes penetrating farther into the Hermit side of the zone than vice versa. Covariances between character states are high at the phenotypic center of the zone. Following Barton and Gale (1993), we use these covariances and the width of the zone to estimate cr, the root mean square dispersal distance. Both Washington zones are narrow rel- ative to cr, indicating that selection is preventing these zones from increasing in width. Hy- brid superiority within an ecotone, recency of contact, and habitat modification seem insuf- ficient as explanations for the abrupt transition that takes place in these zones. Asymmetries in the character-transition curves suggest that the zones are moving. We find no evidence that this inferred movement can be attributed to habitat changes or to differences in dispersal between the parental species. Other studies suggest that the primary cause of this inferred movement is behavioral dominance of Townsend's males over Hermit males. The shape of the zone in the Washington Cascades also suggests that Townsend's on the east side of the Cascade Mountains are better adapted to dry forests, possibly due to gene flow from pop- ulations derived from the Rocky Mountains. The third, isolated zone in the Cascade Moun- tains of Oregon offers unique opportunities to test this hypothesis. Received 25 June 1997," @default.
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- W2319703186 date "1998-04-01" @default.
- W2319703186 modified "2023-09-30" @default.
- W2319703186 title "Three Hybrid Zones between Hermit and Townsend's Warblers in Washington and Oregon" @default.
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- W2319703186 doi "https://doi.org/10.2307/4089188" @default.
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