Research Article

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 ( )].
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(a)
148745.fig.002b
(b)