Disentangling the effects of mating propensity and mating choice in Drosophila
Disentangling the effects of mating propensity and mating choice in Drosophila
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DOI：
10.2307/2410927
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发表时间：
1998-02-01
期刊：
影响因子：
3.3
通讯作者：
Barros, AR
中科院分区：
文献类型：
--
作者：
Casares, P;Carracedo, MC;Barros, AR
在果蝇中，相同物种的基因型别、品系或种群之间的初级性隔离通常是通过选择测试来测量的。众所周知，这些测试的结果受到竞争对手的交配倾向和求爱过程中的歧视因素的影响，这种影响是不确定的。我们通过在不同的独立测试中测量男性和女性的倾向来解决这个问题，并检查这些估计是否可以解释选择测试的结果。首先，使用雄性和雌性选择测试来衡量果蝇种群之间和拟态果蝇种群之间的性隔离。在48个测试中，有31个出现了与随机交配的显著偏离，这与所测试的基因类型的倾向性值一致。我们的结论是，交配倾向而不是歧视直接涉及到我们种群中的性别隔离的估计，并建议在没有适当了解竞争个体的交配倾向的情况下，不要应用男性和女性选择测试来评估种内隔离。其次，多项选择测试被用来评估黑腹果蝇种群之间的隔离。在检查整个测试过程中交配的动态时，我们表明，如果相互竞争的个体在交配倾向上存在差异，并且测试的时间足够长，允许大多数交配发生，可能会出现虚假的性隔离。我们建议，一旦观察到50%的匹配，多项选择测试就应该终止。
Incipient sexual isolation between genotypes, lines, or populations of the same species is commonly measured in Drosophila by choice tests. Results of these tests are known to be influenced, in an undetermined manner, by the mating propensity of competitors and by discriminatory factors during courtship. We have approached the problem by measuring male and female propensities in separate, independent tests, and by examining whether these estimates could explain the results of the choice tests. First, male and female choice tests were used to measure sexual isolation between populations of Drosophila melanogaster and between populations of D. simulans. Significant deviations from random mating occurred in 31 out of 48 tests, in agreement with the propensity values of the tested genotypes. We conclude that mating propensity instead of discrimination is directly involved in the estimation of sexual isolation in our populations, and advise against the application of male and female choice tests to assess intraspecific isolation without a proper knowledge of the mating propensities of competing individuals. Second, multiple choice tests were used to assess isolation between D. melanogaster populations. In examining the dynamics of matings throughout the test, we show that if competing individuals differ in mating propensities and tests are long enough to allow most matings to happen, a spurious sexual isolation can appear. We recommend that multiple choice tests be terminated once 50 percent of matings had been observed.