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Selfish strategies and honest signalling: reproductive conflicts in ant queen associations

机译:自私的策略和诚实的信号:蚁后协会中的生殖冲突

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摘要

Social insects offer unique opportunities to test predictions regarding the evolution of cooperation, life histories and communication. Colony founding by groups of unrelated queens, some of which are later killed, may select for selfish reproductive strategies, honest signalling and punishment. Here, we use a brood transfer experiment to test whether cofounding queens of the ant Lasius niger ‘selfishly’ adjust their productivity when sharing the nest with future competitors. We simultaneously analysed queen cuticular hydrocarbon (CHC) profiles to investigate whether queens honestly signal their reproductive output or produce dishonest, manipulative signals, providing a novel test of the evolutionary significance of queen pheromones. Queens produced fewer workers when their colony contained ample brood, but only in the presence of competitors, suggesting selfish conservation of resources. Several CHCs correlated with reproductive maturation, and to a lesser extent with productivity; the same hydrocarbons were more abundant on queens that were not killed, suggesting that workers select productive queens using these chemical cues. Our results highlight the role of honest signalling in the evolution of cooperation: whenever cheaters can be reliably identified, they may incur sanctions that reduce the incentive to be selfish.
机译:社会昆虫为检验有关合作,生活史和沟通演变的预测提供了独特的机会。由一群不相关的女王建立的殖民地,其中一些后来被杀死,可能会选择自私的繁殖策略,诚实的信号和惩罚。在这里,我们使用育雏实验来测试与未来竞争者共享巢穴时,联合创始人蚁巢女王拉西乌斯·尼日尔的女王是否“自私地”调整了生产力。我们同时分析了皇后表皮碳氢化合物(CHC)资料,以调查皇后是否诚实地表示其生殖输出或产生不诚实的操纵信号,从而为皇后信息素的进化意义提供了新颖的检验。皇后区的种群繁衍后,皇后生产的工人较少,但只有在竞争者在场的情况下,这表明资源的自私保护。几种CHC与生殖成熟有关,而与生产力的相关程度较小;在未杀死的皇后身上,同样的碳氢化合物含量更高,这表明工人使用这些化学线索选择了有生产力的皇后。我们的结果强调了诚实的信号在合作演变中的作用:只要能够可靠地识别作弊者,他们就可能受到制裁,从而降低了自私的动机。

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