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Tactical Release of a Sexually-Selected Pheromone in a Swordtail Fish

Figure 3

Males prefer to urinate near females.

Mean (+ SE) number of male urine pulses per hour within 12.5 cm of the adjacent stimulus aquarium (closest: quadrant 1) and in the remaining 37.5 cm of the male's aquarium (other: quadrants 2–4) with females present and absence. p-values from Wilcoxon signed-ranks tests are shown.

Figure 3

doi: https://doi.org/10.1371/journal.pone.0016994.g003