Syntopic frogs reveal different patterns of interaction with the landscape: A comparative landscape genetic study of and from central China.

Amphibians are often considered excellent environmental indicator species. Natural and man-made landscape features are known to form effective genetic barriers to amphibian populations; however, amphibians with different characteristics may have different species-landscape interaction patterns. We conducted a comparative landscape genetic analysis of two closely related syntopic frog species from central China, () and (). These two species differ in several key life history traits; has a larger body size and larger clutch size, and reaches sexual maturity later than . Microsatellite DNA data were collected and analyzed using conventional (, isolation by distance (IBD), AMOVA) and recently developed (Bayesian assignment test, isolation by resistance) landscape genetic methods. As predicted, a higher level of population structure in (' = 0.401) than in (' = 0.354) was detected, in addition to displaying strong IBD patterns (=.861) unlike (=.073). A general north-south break in populations was detected, consistent with the IBD pattern, while exhibited clustering of northern- and southern-most populations, suggestive of altered dispersal patterns. Species-specific resistant landscape features were also identified, with roads and land cover the main cause of resistance to , and elevation the main influence on . These different species-landscape interactions can be explained mostly by their life history traits, revealing that closely related and ecologically similar species have different responses to the same landscape features. Comparative landscape genetic studies are important in detecting such differences and refining generalizations about amphibians in monitoring environmental changes.