Vernal pools are unique in their isolation and the strong selection acting on their resident species. Vernal pool clam shrimp (Eulimnadia texana) are a promising model due to ease of culturing, short generation time, small genomes, and obligate desiccated diapaused eggs. Clam shrimp are also androdioecious (sexes include males and hermaphrodites), and here we use population scaled recombination rates to support the hypothesis that the heterogametic sex is recombination free in these shrimp. We collected short read sequence data from pooled samples from different vernal pools to gain insights into local adaptation. We identify genomic regions in which some populations have allele frequencies that differ significantly from the metapopulation. BayPass (Gautier 2015) detected 19 such genomic regions showing an excess of population subdivision. These regions on average are 550bp in size and had 2.5 genes within 5kb of them. Genes located near these regions are involved in malpighian tubule function and osmoregulation, an essential function in vernal pools. It is likely that salinity profiles vary between pools and over time, and variants at these genes are adapted to local salinity conditions.

中文翻译：

---

天然春季池蛤虾（Eulimnadia texana）局部适应的基因组特征。


春天池的独特之处在于其隔离性和对其常驻物种的强烈选择。春池蛤虾（ Eulimnadia texana ）由于易于培养、世代时间短、基因组小和专性干燥滞育卵而成为一种有前途的模式。蛤虾也是雌雄异体（性别包括雄性和雌雄同体），在这里我们使用群体规模重组率来支持这些虾的异配性别不发生重组的假设。我们从不同春季池的合并样本中收集了短读序列数据，以深入了解局部适应。我们确定了一些群体的等位基因频率与集合群体显着不同的基因组区域。 BayPass (Gautier 2015) 检测到 19 个这样的基因组区域，显示出过度的群体细分。这些区域平均大小为 550bp，并且在 5kb 范围内包含 2.5 个基因。位于这些区域附近的基因涉及马氏小管功能和渗透压调节，这是春季池的重要功能。不同池之间以及随着时间的推移，盐度分布可能会有所不同，并且这些基因的变异会适应当地的盐度条件。