SPERM COMPETITION AND THE EVOLUTION OF MULTIPLE MATING
SPERM COMPETITION AND THE EVOLUTION OF MULTIPLE MATING
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DOI：
10.1086/285206
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发表时间：
1991-07-01
影响因子：
2.9
通讯作者：
CURTSINGER, JW
中科院分区：
文献类型：
--
作者：
CURTSINGER, JW
“性精子”假说认为，多次交配的雌性比单次交配的雌性具有选择优势，因为前者受精的精子最具竞争力，其儿子产生的精子也最具竞争力。这里描述了性精子过程的确定性遗传模型。它假设一个基因座影响精子的竞争能力，另一个基因座影响雌性的交配行为。精子竞争促进雌性多次交配进化的条件是非常有限的：两个基因座之间必须存在紧密的连锁，正连锁不平衡，并且没有与多次交配相关的适应度成本。任何特征（甚至是单身女性的行为）都可以通过搭便车而增加，如果它不需要任何成本，并且在一个与积极选择的精子竞争位点紧密相关的位点的控制下。当多次交配有成本时，性精子机制失效：多次交配倾向最初增加，但当连锁不平衡消退时被消除。联动不平衡，而不是代际回报，是这个模型的驱动力。在该模型的假设下，精子竞争在雌性交配频率的进化中没有特殊作用。
The "sexy-sperm" hypothesis proposes that multiple-mating females have a selective advantage over single-mating females because the former are fertilized by the most competitive sperm and have sons that produce competitive sperm. A deterministic genetical model of the sexy-sperm process is described here. It assumes one locus that influences sperm competitive ability and a second locus that influences female mating behavior. The conditions for sperm competition to promote the evolution of multiple mating in females are very restrictive: there must be tight linkage between the two loci, positive linkage disequilibrium, and no fitness cost associated with multiple mating. Any trait (even single-mating female behavior) can increase by hitchhiking if it carries no cost and is under the control of a locus that is tightly linked to the positively selected sperm competition locus. When there are costs for multiple mating, the sexy-sperm mechanism fails: the multiple-mating tendency increases initially but is eliminated when linkage disequilibrium decays. Linkage disequilibrium, rather than intergenerational payoff, is the driving force in this model. Under the assumptions of this model, sperm competition plays no special role in the evolution of female mating frequency.