DYNAMIC TRANSMISSION, HOST QUALITY, AND POPULATION STRUCTURE IN A MULTIHOST PARASITE OF BUMBLEBEES
DYNAMIC TRANSMISSION, HOST QUALITY, AND POPULATION STRUCTURE IN A MULTIHOST PARASITE OF BUMBLEBEES
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DOI：
10.1111/j.1558-5646.2012.01655.x
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发表时间：
2012-10-01
期刊：
影响因子：
3.3
通讯作者：
Brown, Mark J. F.
中科院分区：
文献类型：
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作者：
Ruiz-Gonzalez, Mario X.;Bryden, John;Brown, Mark J. F.
多宿主寄生虫的进化生态学预测取决于主机质量和传输网络的动态模式。根据主机质量和传输不对称的差异，以及种内和种间传输之间的平衡，专家或通才策略的演变进行预测。使用锥虫寄生虫的熊蜂，我们问宿主质量和传播网络如何与寄生虫种群结构跨宿主物种，从而适应不同的宿主物种的专业菌株的进化潜力。宿主物种的质量不同，寄生虫的生长因宿主物种而异。高度不对称的传播网络，以及宿主质量的差异，可能解释了寄生虫在宿主物种中的局部种群结构。然而，跨年的寄生虫种群结构是高度动态的，寄生虫种群从一年到下一年在一个给定的网站内的个别物种的显着变化。这表明，虽然主机质量和传输可能提供的机会，短期主机专业化的寄生虫，反复的寄生虫，结合其自身的生殖生物学，覆盖这些较小的规模效应，导致进化的通才寄生虫。
The evolutionary ecology of multihost parasites is predicted to depend upon patterns of host quality and the dynamics of transmission networks. Depending upon the differences in host quality and transmission asymmetries, as well as the balance between intra- and interspecific transmission, the evolution of specialist or generalist strategies is predicted. Using a trypanosome parasite of bumblebees, we ask how host quality and transmission networks relate to parasite population structure across host species, and thus the potential for the evolution of specialist strains adapted to different host species. Host species differed in quality, with parasite growth varying across host species. Highly asymmetric transmission networks, together with differences in host quality, likely explain local population structure of the parasite across host species. However, parasite population structure across years was highly dynamic, with parasite populations varying significantly from one year to the next within individual species at a given site. This suggests that, while host quality and transmission may provide the opportunity for short-term host specialization by the parasite, repeated bottlenecking of the parasite, in combination with its own reproductive biology, overrides these smaller scale effects, resulting in the evolution of a generalist parasite.