Cyclic dominance emerges from the evolution of two inter-linked cooperative behaviours in the social amoeba
Cyclic dominance emerges from the evolution of two inter-linked cooperative behaviours in the social amoeba
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DOI：
10.1098/rspb.2018.0905
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发表时间：
2018-01
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影响因子：
--
通讯作者：
Shota Shibasaki;Masakazu Shimada
中科院分区：
文献类型：
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作者：
Shota Shibasaki;Masakazu Shimada
合作的进化一直是社会生物学研究的重要问题之一，许多研究者已经揭示了促进合作进化的机制。然而，大多数研究只涉及一种合作行为，即使有些生物体执行两种或更多种合作行为。社会阿米巴Dictyosteelicdiscoideum执行两个合作行为在饥饿：子实体的形成和大包囊的形成。在这里，我们构建了一个模型，耦合这两种行为，我们发现，这两种行为是保持由于出现的循环优势，虽然合作不能发展，如果只有两种行为中的任何一种进行。常见的化学引诱物环AMP用于子实体形成和大孢囊形成，为这种偶联提供了生物学背景。无论模型中是否存在交配类型或空间结构，都会出现循环优势。此外，即使在种群灭绝后，合作也可以重新出现。这些结果表明，这两个合作行为的社会阿米巴维持由于共同的化学信号，基础都子实体的形成和大包囊的形成。我们证明了耦合多个游戏的重要性时，基本的行为是相互关联的。
Evolution of cooperation has been one of the most important problems in sociobiology, and many researchers have revealed mechanisms that can facilitate the evolution of cooperation. However, most studies deal only with one cooperative behaviour, even though some organisms perform two or more cooperative behaviours. The social amoeba Dictyostelium discoideum performs two cooperative behaviours in starvation: fruiting body formation and macrocyst formation. Here, we constructed a model that couples these two behaviours, and we found that the two behaviours are maintained due to the emergence of cyclic dominance, although cooperation cannot evolve if only either of the two behaviours is performed. The common chemoattractant cyclic AMP is used in both fruiting body formation and macrocyst formation, providing a biological context for this coupling. Cyclic dominance emerges regardless of the existence of mating types or spatial structure in the model. In addition, cooperation can re-emerge in the population even after it goes extinct. These results indicate that the two cooperative behaviours of the social amoeba are maintained due to the common chemical signal that underlies both fruiting body formation and macrocyst formation. We demonstrate the importance of coupling multiple games when the underlying behaviours are associated with one another.