POLYMORPHISM FOR DIRECTION OF COIL IN PARTULA-SUTURALIS - BEHAVIORAL ISOLATION AND POSITIVE FREQUENCY-DEPENDENT SELECTION
POLYMORPHISM FOR DIRECTION OF COIL IN PARTULA-SUTURALIS - BEHAVIORAL ISOLATION AND POSITIVE FREQUENCY-DEPENDENT SELECTION
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DOI：
10.1038/hdy.1982.80
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发表时间：
1982-01-01
期刊：
影响因子：
3.8
通讯作者：
JOHNSON, MS
中科院分区：
文献类型：
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作者：
JOHNSON, MS
在蜗牛中，缝线螺的壳盘绕方向是不寻常的。多态种群发生在单态右端或左端种群之间的狭窄线中。右侧种群的分布与近亲种P. mooreana、P. tohiveana和P. olympia的分布一致，表明性状位移是生殖隔离的结果。手性影响求偶行为，无选择交配实验表明，拥有相反线圈的配偶交配的频率只有拥有相同线圈的夫妇的20%。这些混合的配偶产生的后代更少。在一个由相同频率的两种形态组成的种群中，右旋和左旋的育性是相同的。在野生捕获的蜗牛种群中，这种罕见的形态比常见的形态产生的后代更少。手性对行为隔离的影响导致了对稀有形态的选择，这说明了多态种群的稀有性。这种正频率相关的选择能够保持杂交区的稳定性。
P. suturalis is unusual among snails in being polymorphic for direction of shell coiling. Polymorphic populations of P. suturalis occur in narrow clines between areas of monomorphic dextral or sinistral populations. The distribution of dextral populations coincides with the distribution of the sinistral species P. mooreana, P. tohiveana and P. olympia suggesting character displacement for reproductive isolation. Chirality affects courtship behavior, and no-choice mating experiments show that pairs with opposite coil mate only 20% as frequently as do pairs with the same coil. Fewer young are produced by these mixed pairs. Fertilities of dextral and sinistral P. suturalis are the same in a population composed of equal frequencies of the 2 morphs. Among wild-caught snails from a population in which sinistrals occur at low frequency, the rare morph produces fewer young than the common morph. The effects of chirality on behavioral isolation result in selection against the rare morph, accounting for the rarity of polymorphic populations. Such positive frequency dependent selection is capable of maintaining the stability of hybrid zones.