全球智库信息集成服务系统(G2TT): Evolutionary emergence and maintenance of horizontally transmitted mutualism that do not rely on the supply of standing variation in symbiont quality.

G2TT

来源类型	Article
规范类型	其他
DOI	10.1111/jeb.13187
	Evolutionary emergence and maintenance of horizontally transmitted mutualism that do not rely on the supply of standing variation in symbiont quality.
	Uchiumi Y; Ohtsuki H; Sasaki A
发表日期	2017
出处	Journal of Evolutionary Biology 30 (12): 2211-2221
出版年	2017
语种	英语
摘要	Mutualism based on reciprocal exchange of costly services must avoid exploitation by ‘free-rides’. Accordingly, hosts discriminate against free-riding symbionts in many mutualistic relationships. However, as the selective advantage of discriminators comes from the presence of variability in symbiont quality that they eliminate, discrimination and thus mutualism have been considered to be maintained with exogenous supply of free-riders. In this study, we tried to resolve the ‘paradoxical’ co-evolution of discrimination by hosts and cooperation by symbionts, by comparing two different types of discrimination: ‘one-shot’ discrimination, where a host does not reacquire new symbionts after evicting free-riders, and ‘resampling’ discrimination, where a host does from the environment. Our study shows that this apparently minor difference in discrimination types leads to qualitatively different evolutionary outcomes. First, although it has been usually considered that the benefit of discriminators is derived from the variability of symbiont quality, the benefit of a certain type of discriminators (e.g. one-shot discrimination) is proportional to the frequency of free-riders, which is in stark contrast to the case of resampling discrimination. As a result, one-shot discriminators can invade the free-rider/nondiscriminator population, even if standing variation for symbiont quality is absent. Second, our one-shot discriminators can also be maintained without exogenous supply of free-riders and hence is free from the paradox of discrimination. Therefore, our result indicates that the paradox is not a common feature of evolution of discrimination but is a problem of specific types of discrimination.
主题	Evolution and Ecology (EEP)
关键词	discrimination evolution of cooperation free-rider horizontally transmitted symbiosis mutualism partner choice sanction
URL	http://pure.iiasa.ac.at/id/eprint/14904/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/131152
推荐引用方式 GB/T 7714	Uchiumi Y,Ohtsuki H,Sasaki A. Evolutionary emergence and maintenance of horizontally transmitted mutualism that do not rely on the supply of standing variation in symbiont quality.. 2017.