Greenish warbler

Question 1

Reference

Answer 1

Alcaide et al. (2014)

Question 2

The greenish warbler species … forms a ring of populations around …

Answer 2

complex, Tibet

Question 3

Two … … forms co-exist in central …, with a … of genetic and phenotypic characteristics through the … chain of populations connecting them

Answer 3

reproductively isolated, Siberia, gradient, southern

Question 4

This study used genome-wide analysis to show that, although spatial patterns of … … are currently mostly as expected of a ring species, historical breaks in … … have existed at more than one location around the ring, and the two Siberian forms have occasionally …

Answer 4

genetic variation, gene flow, interbred

Question 5

Substantial periods of … … occurred not only in the north but also in the Western Himalayas, where there is now an extensive hybrid zone between genetically … forms.

Answer 5

geographical isolation, divergent

Question 6

Limited … … has occurred directly between the … forms, but it has not caused a … of those forms, suggesting selection against … genes

Answer 6

asymmetric introgression, merging, introgressed

Question 7

Levels of reproductive isolation and genetic introgression are consistent with levels of phenotypic divergence around the ring - phenotypic similarity and extensive interbreeding across the … contact zone and strong phenotypic divergence and almost complete reproductive isolation across the … contact zone

Answer 7

southwestern, northern