Molecular markers
FST values can be strongly affected by the genotyping technique implemented (Nybom, 2004; Nybom & Bartish, 2000; Meirmans & Hedrick, 2011), thus, we included this factor in our null model. In our database, the majority of studies used nuclear microsatellites (140 species), followed by allozymes (114 species). Fewer studies used dominantly inherited markers, including Amplified Fragment Length Polymorphism (60 species), Random Amplification of Polymorphic DNA (16 species), and Inter-Simple Sequence Repeat (7 species).