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Limited host availability disrupts the genetic correlation between virulence and transmission
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Virulence is expected to be linked to parasite fitness via transmission. However, it is not clear whether this relationship is genetically determined, nor if it differs when transmission occurs continuously during, or only at the end of, the infection period. Here, we used inbred lines of the macroparasitic spider mite Tetranychus urticae to disentangle genetic vs. nongenetic correlations among traits, while varying parasite density and opportunities for transmission. A positive genetic correlation between virulence and the number
of transmitting stages produced was found under continuous transmission. However, if transmission occurred only at the end of the infection period, this genetic correlation disappeared. Instead, we observed a negative relationship between virulence and the num ber of transmitting stages, driven by density dependence. Thus, within-host density dependence caused by reduced opportunities for transmission may hamper selection for higher virulence, providing a novel explanation as to why limited host availability leads to lower virulence
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Citação
Godinho DP, Rodrigues LR, Lefèvre S, Delteil L, Mira AF, Fragata IR, Magalhães S, Duncan AB. Limited host availability disrupts the genetic correlation between virulence and transmission. Evol Lett. 2023 Jan 31;7(1):58-66. doi: 10.1093/evlett/qrac008. PMID: 37065437; PMCID: PMC10091498.
Editora
Oxford University Press