Figure 4

Recombination and Marey maps. Grayscale symbols and lines indicate the relationship between the physical distance (scaffold midposition) in Mb on the x-axis and the genetic distance in cM for each of the eight LGs on the left y-axis. ○’s represent the dense ParKoh linkage map, ▵’s and ⋄’s represent that of the KonPar and PruKoh cross, respectively. The corresponding lines (ParKoh: solid; KonPar: dashed; PruKoh: dotted) indicate the fitted smoothing spline (10 d.f.). The red lines (same stroke style) show the first order derivative of the fitted splines and represent the variation in recombination rate as a function of physical distance (cM/Mb, on the right y-axis). Gray bars indicate the approximate location of male song rhythm QTL peaks. The yellow ☆ in the LG1 panel highlights the QTL peak that colocalizes with a female preference QTL peak (Shaw and Lesnick 2009).