Table 2. Mean estimates of the component of reproductive
isolating barriers (RIi ) and estimated divergence
time (Mya) of closely related species pairs in Daphnia . We
omitted articles that only examine hybrid success, as these studies do
not have a direct comparison with parental species. Estimates ofRIi for each species pair were obtained from data
sources and were calculated based on methods from Sobel and Chen (2014).
Sequence divergence estimates were based on Colbourne and Hebert
19961, Taylor et al. 19962, and
Schwenk et al 20003.