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.