Ecological divergence and conservatism: spatiotemporal patterns of niche evolution in a genus of livebearing fishes (Poeciliidae: Xiphophorus).

Several other marginally non-significant peaks can be seen in the disparity plot for maximum temperature (Fig. 5 ), including two simultaneous events in the northern and southern swordtails at ~1.7 MYA (0.66 relative time): the divergence of the widely distributed X. hellerii ( P = 0.054) and its sister clade, as well as the divergence of the clade uniting X. birchmanni , X. cortezi , and X. malinche ( P = 0.074).

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