期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 282, 期 1799, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2014.2333
关键词
cost of resistance; defensive symbiosis; Hamiltonella defensa; lifespan; parasitoid; trade-off
资金
- Swiss National Science Foundation (SNSF) [PP00P3_123376]
- Swiss National Science Foundation (SNF) [PP00P3_123376] Funding Source: Swiss National Science Foundation (SNF)
Defences against parasites are typically associated with costs to the host that contribute to the maintenance of variation in resistance. This also applies to the defence provided by the facultative bacterial endosymbiont Hamiltonella defensa, which protects its aphid hosts against parasitoid wasps while imposing life-history costs. To investigate the cost-benefit relationship within protected hosts, we introduced multiple isolates of H. defensa to the same genetic backgrounds of black bean aphids, Aphis fabae, and we quantified the protection against their parasitoid Lysiphlebus fabarum as well as the costs to the host (reduced lifespan and reproduction) in the absence of parasitoids. Surprisingly, we observed the opposite of a trade-off. Strongly protective isolates of H. defensa reduced lifespan and lifetime reproduction of unparasitized aphids to a lesser extent than weakly protective isolates. This finding has important implications for the evolution of defensive symbiosis and highlights the need for a better understanding of how strain variation in protective symbionts is maintained.
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