Competitive fates of bacterial social parasites:: persistence and self-induced extinction of Myxococcus xanthus cheaters
Competitive fates of bacterial social parasites:: persistence and self-induced extinction of Myxococcus xanthus cheaters
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DOI：
10.1098/rspb.2003.2387
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发表时间：
2003-07-22
影响因子：
4.7
通讯作者：
Velicer, GJ
中科院分区：
文献类型：
--
作者：
Fiegna, F;Velicer, GJ
合作的生物系统很容易受到作弊的破坏。使用社会细菌黄粘球菌，我们测试了混合菌株和野生型菌株在多个合作开发周期中的短期竞争命运。骗子/野生型混合物经历了几个饥饿诱导的多细胞发育周期，然后是孢子萌发和营养群体生长。在每个发育阶段和每个生长阶段结束时测量每个成对混合物中作弊者和野生型菌株的种群规模。作弊者基因型表现出几种不同的竞争命运，包括作弊者在高频率下的持续存在，对总种群动态影响很小，作弊者在总种群动态受到重大破坏后的持续存在，作弊者在野生型生存下的自我灭绝，以及总种群灭绝。我们的结果凭经验证明，社会剥削会破坏合作生物系统的稳定性，并增加局部灭绝事件的风险。
Cooperative biological systems are susceptible to disruption by cheating. Using the social bacterium Myxococcus xanthus, we have tested the short-term competitive fates of mixed cheater and wild-type strains over multiple cycles of cooperative development. Cheater/wild-type mixes underwent several cycles of starvation-induced multicellular development followed by spore germination and vegetative population growth. The population sizes of cheater and wild-type strains in each pairwise mixture were measured at the end of each developmental phase and each growth phase. Cheater genotypes showed several distinct competitive fates, including cheater persistence at high frequencies with little effect on total population dynamics, cheater persistence after major disruption of total population dynamics, self-extinction of cheaters with wild-type survival, and total population extinction. Our results empirically demonstrate that social exploitation can destabilize a cooperative biological system and increase the risk of local extinction events.