Thomas-Orillard M, Legendre S
Laboratoire d'écologie, URA-CNRS 258, Université Pierre-et-Marie-Curie, Paris, France.
C R Acad Sci III. 1996 Jul;319(7):615-21.
Drosophila melanogaster populations are naturally infected by the Drosophila C virus (DCV). Ingestion of this non-hereditary virus early in the life-cycle has a positive effect. Demographic parameters measured on DCV-free and DCV-infected populations of the same genotype enabled us to compute the population growth rates (multiplication rates) by means of matrix models. The DCV-infected sample had a larger growth rate both for low and high larval densities. Since it is not possible to experiment on a mixed population where DCV-free and DCV-infected individuals live together, a model combining competition and contamination was used. Simulations showed that coexistence of free and infected animals can occur. Such a result leads us to question the relation between population growth rate and fitness.
黑腹果蝇种群自然感染果蝇C病毒（DCV）。在生命周期早期摄入这种非遗传性病毒具有积极作用。通过对相同基因型的无DCV和感染DCV的种群进行测量的人口统计学参数，我们能够借助矩阵模型计算种群增长率（繁殖率）。对于低幼虫密度和高幼虫密度，感染DCV的样本都有更高的增长率。由于不可能在无DCV个体和感染DCV个体共同生活的混合种群上进行实验，因此使用了一个结合竞争和污染的模型。模拟结果表明无病毒和受感染动物可以共存。这样的结果促使我们质疑种群增长率与适应性之间的关系。
