Investigating effects of habitat fragmentation and precipitation upon plant population structures and dynamics of three Therophytes

我们调查，如果植物的相似的生活形式和生存策略显示出相似的模式的遗传分布在同一尺度的碎片和降水。在一个支离破碎的农业生态系统中，我们研究了植物物种与以前连接的人口现在经历的基因流的限制，以及这如何影响人口结构和动态。为了检测影响种群动态的决定因素，我们将空间与生态属性相关联，并将其与种群间观察到的遗传和表型变异进行比较。在三种生活史、生殖系统和生态约束相似的一年生短命植物中，我们预期在相同的选择压力下，种群遗传模式相似。如果我们发现这些物种的种群结构的差异，它们很可能是不同的传播策略（单性结实与异果性）的影响的指示。将估计群体相关性和潜在共同祖先的数量。通过比较所有种群和所有物种的不同个体之间的突变差异（通过基于序列的基因分型（SBG）生成的SNP），将检测偏离中性预期的离群基因座，以鉴定潜在选择的等位基因。

We investigate if plants of similar life forms and survival strategies show similar patterns of genetic distribution in response to the same scales of fragmentation and precipitation. In a fragmented agroecosystem we examine if plant species with formerly connected populations now experience restriction of gene flow, and how this affects population structure and dynamics. To detect determinants which impact population dynamics, we associate spatial versus ecological attributes and compare them with the observed genetic and phenotypic variation among populations. In three therophytic ephemeral species with similar life cycles, reproduction systems and ecological constrains, we expect similar population genetic patterns under the same selection pressures. If we detect differences in population structures of these species, they most likely are indicative for the impact of different dispersal strategies (monocarpic versus heterocarpic). The amounts of population relatedness and potential co-ancestry will be estimated. By comparison of mutational differences (SNPs generated by Sequence based Genotyping (SBG)) between the different individuals of all populations and all species, outlier loci departing from neutral expectations will be detected to identify alleles which are potentially under selection.