Persistence of the single lineage of transmissible 'social cancer' in an asexual ant
Persistence of the single lineage of transmissible 'social cancer' in an asexual ant
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DOI：
10.1111/j.1365-294x.2010.04954.x
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发表时间：
2011-02-01
影响因子：
4.9
通讯作者：
Tsuji, K.
中科院分区：
文献类型：
--
作者：
Dobata, S.;Sasaki, T.;Tsuji, K.
鉴于作弊表型的威胁，合作如何产生并持续是进化生物学的一个核心问题，但人们对自然群体中作弊的实际意义仍然知之甚少。社会进化理论预测，作弊者的血统在进化上是短命的。然而，一个例外来自专性社会寄生物种，其中一些被认为是出现在合作者殖民地内的骗子，然后通过同域物种形成而分化。这个过程要求作弊者的血统能够持续下去，避免由于作弊者对宿主造成适应性成本而导致的快速灭绝。我们研究了这一先决条件是否得到满足，通过估计的持续时间的骗子在一个领域的人口的孤雌生殖的蚂蚁Pristomyrmex punctatus。群体遗传学分析发现，作弊者属于一个单系，我们推断它已经持续了200-9200代。我们发现，作弊迁移，从而在殖民地之间水平传播，一个特性，使血统，以避免快速灭绝与其宿主殖民地。虽然水平传播的破坏性骗子有可能导致整个人口的灭绝，这种崩溃可能是避免时，有空间限制的迁移在一个结构化的人口，一个场景，我们发现，与观察到的隔离距离patterns. We比较我们的结果与其他的破坏性和水平传播的骗子血统的性质的例子。
How cooperation can arise and persist, given the threat of cheating phenotypes, is a central problem in evolutionary biology, but the actual significance of cheating in natural populations is still poorly understood. Theories of social evolution predict that cheater lineages are evolutionarily short-lived. However, an exception comes from obligate socially parasitic species, some of which thought to have arisen as cheaters within cooperator colonies and then diverged through sympatric speciation. This process requires the cheater lineage to persist by avoiding rapid extinction that would result from the fact that the cheaters inflict fitness cost on their host. We examined whether this prerequisite is fulfilled, by estimating the persistence time of cheaters in a field population of the parthenogenetic ant Pristomyrmex punctatus. Population genetic analysis found that the cheaters belong to one monophyletic lineage which we infer has persisted for 200-9200 generations. We show that the cheaters migrate and are thus horizontally transmitted between colonies, a trait allowing the lineage to avoid rapid extinction with its host colony. Although horizontal transmission of disruptive cheaters has the potential to induce extinction of the entire population, such collapse is likely averted when there is spatially restricted migration in a structured population, a scenario that matches the observed isolation by distance pattern that we found. We compare our result with other examples of disruptive and horizontally transmissible cheater lineages in nature.