Population genetic structure in a social landscape: barley in a traditional Ethiopian agricultural system

Conservation strategies are increasingly driven by our understanding of the processes and patterns of gene flow across complex landscapes. The expansion of population genetic approaches into traditional agricultural systems requires understanding how social factors contribute to that landscape, and thus to gene flow. This study incorporates extensive farmer interviews and population genetic analysis of barley landraces (Hordeum vulgare) to build a holistic picture of farmer-mediated geneflow in an ancient, traditional agricultural system in the highlands of Ethiopia. We analyze barley samples at 14 microsatellite loci across sites at varying elevations and locations across a contiguous mountain range, and across farmer-identified barley types and management strategies. Genetic structure is analyzed using population-based and individual-based methods, including measures of population differentiation and genetic distance, multivariate Principal Coordinate Analysis, and Bayesian assignment...

保护策略正日益受到我们对复杂景观中基因流过程与模式理解的驱动。群体遗传学方法向传统农业系统的拓展，要求理解社会因素如何塑造这一景观，进而影响基因流。本研究结合了对农民的广泛访谈以及对大麦地方品种（Hordeum vulgare）的群体遗传学分析，旨在构建埃塞俄比亚高地古老传统农业系统中农民介导的基因流的整体图景。我们对连续山脉中不同海拔和地点的大麦样本，以及农民识别的大麦类型和管理策略下的样本，在14个微卫星位点（microsatellite loci）进行了分析。遗传结构分析采用了基于群体和基于个体的方法，包括群体分化和遗传距离的测量、多变量主坐标分析（Principal Coordinate Analysis）以及贝叶斯分配（Bayesian assignment）等方法……