A fitness cost of learning ability in Drosophila melanogaster
A fitness cost of learning ability in Drosophila melanogaster
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DOI：
10.1098/rspb.2003.2548
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发表时间：
2003-12-07
影响因子：
4.7
通讯作者：
Kawecki, TJ
中科院分区：
文献类型：
--
作者：
Mery, F;Kawecki, TJ
在许多动物种群中，学习能力的大量遗传变异的维持表明，学习能力具有适应性成本，但很少有经验证据证明这一点。在本文中，我们证明了黑腹果蝇的学习能力和竞争能力之间的进化权衡。我们表明，与复制的对照种群相比，复制的实验种群中学习能力的提高一直与幼虫竞争能力的下降有关。竞争能力不受每个选择制度内重复群体杂交的影响，排除了作为潜在混杂因素的差异近交。我们的研究结果为学习能力的构成适合度成本提供了证据，即无论学习能力是否实际使用，都要支付该成本。
Maintenance of substantial genetic variation for learning ability in many animal populations suggests that learning ability has fitness costs, but there is little empirical evidence for them. In this paper, we demonstrate an evolutionary trade-off between learning ability and competitive ability in Drosophila melanogaster. We show that the evolution of an improved learning ability in replicated experimental fly populations has been consistently associated with a decline of larval competitive ability, compared with replicated control populations. The competitive ability was not affected by crossing of the replicate populations within each selection regime, excluding differential inbreeding as a potential confounding factor. Our results provide evidence for a constitutive fitness cost of learning ability, i.e. one that is paid irrespective of whether or not the learning ability is actually used.