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Table 1 Regression ( R 2 ) values between hybrid index and phenotypic traits within and outside the hybrid zone

From: Speciation in Western Scrub-Jays, Haldane’s rule, and genetic clines in secondary contact

Trait All Transect Core hybrid
Wing 0.04* ns ns
Tail ns ns ns
Tarsus ns ns ns
Bill length ns ns ns
Bill depth ns ns ns
Bill width 0.11*** ns ns
Morph PC11 ns ns ns
Morph PC22 0.06** ns ns
Morph PC33 0.05** ns ns
Collar 0.38*** 0.23** ns
Vent 0.51*** 0.46*** 0.36***
Eyestripe 0.31*** 0.25*** 0.37***
  1. 1PC1 describes general size.
  2. 2PC2 describes a trade-off between body and bill size.
  3. 3PC3 describes a trade-off between bill length and bill width.
  4. ns = not significant, *p < 0.05, **p < 0.01, ***p < 0.001.