Courtship behavior, nesting microhabitat, and assortative mating in sympatric stickleback species pairs.

Anadromous and freshwater males did not differ in any of the courtship behaviors other than their propensity to perform nest tending activities (which was only marginally significant, Appendix S1 ) or preferences for different nesting substrates in our experiments (although it is not possible to know whether freshwater males would have preferred nesting on weed over sand or gravel as low growing weed is not common in the lagoon from which we collected freshwater fish so they were not offered weed as a nesting substrate).

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