Diversity, divergence and density: How habitat and hybrid zone dynamics maintain a genomic cline in an intertidal barnacle
Diversity, divergence and density: How habitat and hybrid zone dynamics maintain a genomic cline in an intertidal barnacle
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DOI：
10.1111/jbi.14142
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发表时间：
2021-06-24
影响因子：
3.9
通讯作者：
Sotka, Erik E.
中科院分区：
文献类型：
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作者：
Wares, John P.;Strand, Allan E.;Sotka, Erik E.
目的由于种内基因组数据已被证明有助于解释更广泛的生物地理趋势，我们分析了一个已被充分研究的潮间带基因组倾斜区所涉及的种群基因组分离模式，以更好地理解维持这种模式的机制。这些结果是在栖息地利用和可获得性的空间差异以及两个谱系之间杂交的可能适合性后果的背景下解释的。地理位置：北美太平洋沿岸。节肢动物分类单元(长足纲，塞西亚目，龟科；腺鞘螺目)。方法采用测序基因分型的方法，在阿拉斯加南部和加利福尼亚州南部之间的样本中产生单核苷酸多态标记。使用标准群体基因组学方法进行推断，包括分析群体结构、近亲交配和连锁不平衡，以确定所检查的最大数量的基因座中最陡峭的转变。这些数据被放在观察到的种群密度和栖息地可获得性的背景下。结果我们发现，大多数被分析的标记在加利福尼亚州海岸非常狭窄的部分显示出强烈的阵发性转变。标记间连锁不平衡的模式，以及先前的证据表明，繁殖潜力随着纬度和线粒体谱系的变化而变化，这表明腺泡虫北部和南部谱系之间存在一定的生殖隔离，这与加州中部种群密度和栖息地可用性的下降相一致。主要结论基因组多样性的一个显着的克隆转变比以前认为的更强烈和更本地化，并显示出统计模式，表明这些谱系在繁殖和表型上是不同的，可能具有生态重要性。由于该物种已被用于海岸生物地理学中的推断过程，进一步研究协调模式将对增进我们对该地区的理解具有重要意义。
Aim As within-species genomic data have been shown useful in interpreting broader biogeographic trends, we analysed the mode of population genomic isolation involved in a well-studied intertidal genomic cline to better understand the mechanisms maintaining it. These results were interpreted in the context of spatial variation in habitat use and availability as well as likely fitness consequences for hybridization between the two lineages. Location Pacific coast of North America. Taxon Arthropods (Class Maxillopoda, Order Sessilia, Family Balanidae; Balanus glandula). Methods Genotype-by-sequencing approaches were used to generate single-nucleotide polymorphism markers across sites sampled between southern Alaska and Southern California. Inference using standard population genomic methods, including analysis of population structure, inbreeding and linkage disequilibrium, was used to identify the steepest transitions across the largest number of loci examined. These data were put in the context of observed population density and habitat availability. Results We show that the majority of markers analysed show strong clinal transitions in a very narrow portion of the California coast. Patterns of linkage disequilibrium among markers, along with prior evidence of variation in reproductive potential by latitude and by mitochondrial lineage, suggest some reproductive isolation among the northern and southern lineages of B. glandula that are concordant with the drop in population density and habitat availability in central California. Main Conclusions A significant clinal transition in genomic diversity is stronger and more localized than previously recognized and exhibits statistical patterns suggesting that the lineages are reproductively and phenotypically distinct in ways that may be ecologically important. As this species has been used to infer process in coastal biogeography, further study of concordant patterns will be important for advancing our understanding of this region.