. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEX REVERSAL IN PAIRS OF L. DALL1 123 o '5. ro O. —*— Dominant / Male - -o - Subordinate/ Female. Initial Final Figure 2. Papilla length/ width ratios at the start and conclusion for all animals in experiment 1. Dominants (males) had a significantly higher ratio than subordinates (females) at the end of the experiment (t = , df = 14, P ) between fish that became male (mean ± SEM: ± ) and those that remained female (mean ± SEM: ± ). After sex change there was a significant change to a male-typical
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEX REVERSAL IN PAIRS OF L. DALL1 123 o '5. ro O. —*— Dominant / Male - -o - Subordinate/ Female. Initial Final Figure 2. Papilla length/ width ratios at the start and conclusion for all animals in experiment 1. Dominants (males) had a significantly higher ratio than subordinates (females) at the end of the experiment (t = , df = 14, P ) between fish that became male (mean ± SEM: ± ) and those that remained female (mean ± SEM: ± ). After sex change there was a significant change to a male-typical papilla in the fish that demonstrated male-typical behavior (t = , df = 14. P < ). Female papilla ratio remained the same. ± , whereas the ratio in sex changers more than doubled to ± (Fig. 2). All dominant animals exhibited unambiguous male-typi- cal gonad morphology that included the presence of sperm and an AGS. All subordinate individuals were gravid, and eggs were clearly visible within the ovary upon inspection. These results were verified histologically (Fig. 3). The standard length of dominant individuals changed significantly over the course of the experiment (P ). When we examined the magnitude and direction of the change, we found that dominants grew significantly more relative to subordinates (paired /-test. / = , df = 15. P = ). In experiment 1, we noted that the dorsal fin of the dominant fish was elongated. Although we had not mea- sured initial fin length, at the conclusion of the experiment we measured the longest dorsal ray. Dominants had a mean fin length of ± mm, while subordinates had a mean of ± mm (t = , df = 14, P < ). To control for dominant fish simply growing more, we used a ratio of fin length to body length. This ratio was signifi- cantly different: subordinates had a smaller fin with an average of ± fin lengths per body length, and dominant
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
