Geographic and host-mediated population genetic structure in a cestode parasite of the three-spined stickleback

Comparative studies of genetic diversity and population structure can shed light on the ecological and evolutionary factors that influence host–parasite interactions. Here we examined whether geography, time and genetic variation in Alaskan three-spined stickleback (Gasterosteus aculeatus Linneaus) hosts shape the population genetic structure of the diphyllobothridean cestode parasite Schistocephalus solidus (Müller, 1776). Host lineages and haplotypes were identified by sequencing the mitochondrial cytochrome b gene, and host population structure was assessed by Bayesian clustering analysis of allelic variation at 11 microsatellite loci. Parasite population structure was characterized according to allelic variation at eight microsatellite loci. Mantel tests and canonical redundancy analysis were conducted to evaluate the proportion of parasite genetic variation attributable to time and geography vs. host lineage, haplotype, and genotypic cluster. Host and parasite population structure ...

对遗传多样性与种群结构的比较研究，可揭示影响宿主-寄生虫相互作用的生态与进化因素。本研究旨在探究阿拉斯加三刺鱼（Gasterosteus aculeatus Linnaeus）宿主的地理、时间与遗传变异，是否塑造了双叶目绦虫（Diphyllobothridean cestode）寄生虫粗壮叠宫绦虫（Schistocephalus solidus，Müller, 1776）的种群遗传结构。通过对线粒体细胞色素b基因进行测序以鉴定宿主谱系与单倍型，并基于11个微卫星位点的等位基因变异开展贝叶斯聚类分析以评估宿主种群结构；同时依据8个微卫星位点的等位基因变异对寄生虫种群结构进行表征。本研究采用曼特尔检验与典范冗余分析，以评估寄生虫遗传变异中，分别由时间、地理因素，以及宿主谱系、单倍型与基因型聚类所贡献的比例。宿主与寄生虫的种群结构……