Male Fish Deceive Competitors about Mating Preferences

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Male Fish Deceive Competitors about Mating Preferences Martin Plath, Stephanie Richter, Ralph Tiedemann, Ingo Schlupp  Current Biology  Volume 18, Issue 15, Pages 1138-1141 (August 2008) DOI: 10.1016/j.cub.2008.06.067 Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 1 Change of Mating Preferences in the Presence of an Audience in Poecilia mexicana Males During the first part (left two bars in each graph), the focal male could interact with two females without an audience ([A] experiment 1, large and small; [B] experiment 2, conspecific and P. formosa females). During the second part of the trials, half of the males were visually presented with an audience male (middle two bars in each graph), and another half of the trials were repeated without an audience (right two bars in each graph). The direction of male preferences was determined by comparing the numbers of male sexual behaviors directed toward the two types of stimulus females via paired t tests. Data are presented as mean ± SE. Note that the direction of male preferences remained unchanged between the first and second part of a trial when no audience male was presented. By contrast, male mating preferences disappeared when an audience was visually presented. In experiment 2, males directed even more premating behavior (nipping) toward the heterospecific females in the presence of an audience. Bottom two graphs: the female with which the focal males first interacted when released from its acclimatization cylinder (binomial test). Given is the fraction of males first approaching either type of female (bars) and the numbers of males (inserted numbers). Note that most males first interacted with the initially nonpreferred female when an audience was presented, suggesting that the focal males attempted to deceive the audience male. Current Biology 2008 18, 1138-1141DOI: (10.1016/j.cub.2008.06.067) Copyright © 2008 Elsevier Ltd Terms and Conditions