Classic clover cline clues

摘要: Adaptive clines are striking examples of natural selection in action, yet few have been studied depth. In this issue Molecular Ecology, Kooyers & Olsen (2012) introduce modern analyses and thinking towards studies a classical example the rapid repeated evolution latitudinal altitudinal cyanogenesis white clover, Trifolium repens L. Recognizing that adaptive represent trade-offs selective benefits traits at different ends geographical transect, these researchers focus on whether evidence for can be found regional (coarse) local (fine) scales. After adjusting population genetic patterns generated by demographic processes, provide cline is across transect from Louisiana to Wisconsin, USA. Within populations, divergent coupling dominant recessive alleles underlie predicted drive populations gametic phase disequilibrium (LD), pattern has several other reviewed Olsen. The absence LD within any sampled study leads authors suggest may more complex than previously proposed, perhaps even following theoretical predictions geographic mosaic.