Divergent Evolution of Male Aggressive Behaviour: Another Reproductive Isolation Barrier in Extremophile Poeciliid Fishes?
Figure 2
Means (±SE) of (a) numbers of aggressive interactions and (b) fight duration in seven populations of P. mexicana. From left to right: populations from nonsulphidic surface sites [Tampico, Tam (), and Río Oxolotán, Ox ()], the sulphidic creek in the Cueva del Azufre system [El Azufre, EA ()], three cave chambers of the sulphidic Cueva del Azufre [CA-II (), CA-V (), CA-X ()], and the H2S-free cave [Luna Azufre, LA ()].