Mating Walnut Flies: Male Mating
Strategy Gain Curves
The number of eggs fertilized by a focal male can be plotted against
time elapsed to create a "gain curve." On the graphs below,
the two mating strategies, long copulations and short copulations, are
plotted together for comparison.
Since this shows the results of several successive matings, it is actually
a series of gain curves over time. Each curve begins to flatten out before
the fly switches to another female, because the number of eggs fertilized
over time slows down.
Above: because the most eggs are
fertilized in the first few seconds of mating, the "short copulations"
male (red dots) achieves a higher fertilization rate than the "long
copulations" male because he switches females as soon as the curve
begins to flatten.
Above: However, when both types of
males must search a long time to find the next female, the "long
copulations" male does better.
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