Mathiesen Sofie Smedegaard, Thyrring Jakob, Hemmer-Hansen Jakob, Berge Jørgen, Sukhotin Alexey, Leopold Peter, Bekaert Michaël, Sejr Mikael Kristian, Nielsen Einar Eg
Department of Bioscience Arctic Research Centre Aarhus University Aarhus C Denmark; Section for Marine Living Resources National Institute of Aquatic Resources Technical University of Denmark Silkeborg Denmark.
Department of Bioscience Arctic Research Centre Aarhus University Aarhus C Denmark.
Evol Appl. 2016 Oct 26;10(1):39-55. doi: 10.1111/eva.12415. eCollection 2017 Jan.
Climate changes in the Arctic are predicted to alter distributions of marine species. However, such changes are difficult to quantify because information on present species distribution and the genetic variation within species is lacking or poorly examined. Blue mussels, spp., are ecosystem engineers in the coastal zone globally. To improve knowledge of distribution and genetic structure of the complex in the Arctic, we analyzed 81 SNPs in 534 spp. individuals sampled at 13 sites to provide baseline data for distribution and genetic variation of mussels in the European Arctic. was the most abundant species found with a clear genetic split between populations in Greenland and the Eastern Atlantic. Surprisingly, analyses revealed the presence of in high Arctic NW Greenland (77°N) and or their hybrids in SW Greenland, Svalbard, and the Pechora Sea. Furthermore, a high degree of hybridization and introgression between species was observed. Our study highlights the importance of distinguishing between congener species, which can display local adaptation and suggests that information on dispersal routes and barriers is essential for accurate predictions of regional susceptibility to range expansions or invasions of boreal species in the Arctic.
预计北极地区的气候变化将改变海洋物种的分布。然而，由于缺乏关于当前物种分布和物种内遗传变异的信息，或者对这些信息的研究不足，此类变化难以量化。紫贻贝属物种是全球沿海地区的生态系统工程师。为了增进对北极地区紫贻贝属复合体分布和遗传结构的了解，我们分析了在13个地点采集的534个紫贻贝属个体中的81个单核苷酸多态性（SNP），以提供欧洲北极地区紫贻贝分布和遗传变异的基线数据。紫贻贝是所发现的最丰富的物种，在格陵兰岛和东大西洋的种群之间存在明显的遗传分化。令人惊讶的是，分析显示在格陵兰岛西北部高纬度地区（北纬77°）存在紫贻贝，在格陵兰岛西南部、斯瓦尔巴群岛和伯朝拉海存在紫贻贝或其杂交种。此外，还观察到物种之间存在高度的杂交和基因渗入。我们的研究强调了区分同属物种的重要性，同属物种可能表现出局部适应性，并表明关于扩散路线和障碍的信息对于准确预测北极地区对北方物种范围扩张或入侵的区域敏感性至关重要。
