Variation in phenotype, parasite load and male competitive ability across a cryptic hybrid zone.

Multivariate discrimination based on the five traits was highly significant (Wilks' λ = 0.27, F 5,110 = 59.86, P = <0.0001) and classification success was high (western background 100% and eastern background 90.48%) with moderate overlap between backgrounds ( Figure 4 ).

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