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Equal fitness among alternative mating strategies in a harem polygynous insect
Proceedings of the Royal Society B: Biological Sciences ( IF 3.8 ) Pub Date : 2020-07-29 , DOI: 10.1098/rspb.2020.0975
Sarah E Nason 1 , Clint D Kelly 1
Affiliation  

Alternative mating strategies are widespread among animal taxa, with strategies controlled by a genetic polymorphism (Mendelian strategy) being rarer in nature than condition-dependent developmental strategies. Mendelian strategies are predicted to have equal average fitnesses and the proportion of offspring produced by a strategy should equal the equilibrium proportion of individuals representing the strategy in a population. Developmental strategies are not expected to produce offspring in equilibrium proportions; however, whether the alternative phenotypes should have equal average fitness is debated. The Wellington tree wētā (Hemideina crassidens) (Orthoptera: Anostostomatidae) is a harem polygynous insect in which intense sexual competition has favoured the evolution of three alternative mating strategies that differ in weapon size and the ability to fight for control of harems. Here, we use molecular genotyping to test the hypothesis that the alternative strategies in this species are maintained by having equal relative fitness and that morphs produce offspring in equilibrium proportions. As expected, the average relative fitness of the three strategies did not significantly differ and the proportion of offspring produced by each morph is equal to the frequency of that morph in the population. Our results support the hypothesis that the alternative male morphs in H. crassidens represent Mendelian strategies.

中文翻译:

后宫一夫多妻昆虫替代交配策略之间的平等适应性

替代交配策略在动物类群中很普遍,由遗传多态性控制的策略(孟德尔策略)在自然界中比依赖条件的发育策略更罕见。孟德尔策略预计具有相等的平均适应度,并且策略产生的后代比例应等于种群中代表该策略的个体的均衡比例。预期发展策略不会产生均衡比例的后代;然而,替代表型是否应该具有相同的平均适应度是有争议的。惠灵顿树 wētā (Hemideina crassidens) (直翅目:Anostostomatidae) 是一种后宫一夫多妻昆虫,其中激烈的性竞争有利于三种替代交配策略的进化,这些策略在武器大小和争夺后宫控制权的能力上有所不同。在这里,我们使用分子基因分型来测试以下假设:该物种的替代策略通过具有相等的相对适应度来维持,并且变形以平衡比例产生后代。正如预期的那样,三种策略的平均相对适应度没有显着差异,每种变体产生的后代比例等于该变体在种群中的频率。我们的结果支持这样的假设,即 H. crassidens 中的替代雄性变体代表孟德尔策略。我们使用分子基因分型来检验以下假设:该物种的替代策略是通过具有相等的相对适应度来维持的,并且变形以平衡的比例产生后代。正如预期的那样,三种策略的平均相对适应度没有显着差异,每种变体产生的后代比例等于该变体在种群中的频率。我们的结果支持这样的假设,即 H. crassidens 中的替代雄性变体代表孟德尔策略。我们使用分子基因分型来检验以下假设:该物种的替代策略是通过具有相等的相对适应度来维持的,并且变形以平衡的比例产生后代。正如预期的那样,三种策略的平均相对适应度没有显着差异,每种变体产生的后代比例等于该变体在种群中的频率。我们的结果支持这样的假设,即 H. crassidens 中的替代雄性变体代表孟德尔策略。三种策略的平均相对适应度没有显着差异,每种变体产生的后代比例等于该变体在种群中的频率。我们的结果支持这样的假设,即 H. crassidens 中的替代雄性变体代表孟德尔策略。三种策略的平均相对适应度没有显着差异,每种变体产生的后代比例等于该变体在种群中的频率。我们的结果支持这样的假设,即 H. crassidens 中的替代雄性变体代表孟德尔策略。
更新日期:2020-07-29
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