Phylogeographic Analyses of a Boreal-Temperate Ectomycorrhizal Basidiomycete, Amanita muscaria, Suggest Forest Refugia in Alaska During the Last Glacial Maximum
Phylogeographic Analyses of a Boreal-Temperate Ectomycorrhizal Basidiomycete, Amanita muscaria, Suggest Forest Refugia in Alaska During the Last Glacial Maximum
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DOI：
10.1007/978-3-540-92160-8_9
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发表时间：
2010-01-01
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影响因子：
--
通讯作者：
Taylor, D. Lee
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作者：
Geml, Jozsef;Tulloss, Rodham E.;Taylor, D. Lee
伯林吉亚，包括阿拉斯加和西伯利亚东北部，长期以来一直是广泛动植物分类群生物地理研究的焦点。贝林贾末次冰盛期是否存在北方森林保护区是第四纪科学界尚未回答的重大问题。我们使用系统发育和合并的方法分析了鹅膏菌的DNA序列数据，以测试这种北方温带的外生菌根真菌是否存在于末次冰期的阿拉斯加。我们的数据表明，至少有两个地方病群体没有表现出来自或迁入在南部避难所的LGM幸存下来的人口的可检测到的迁徙。其中一种发生在阿拉斯加内陆的北方森林，而另一种是从阿拉斯加东南部到奥林匹克半岛的海洋热带雨林特有的。这些结果表明，在末次大冰期之前，基因是隔离的，并支持阿拉斯加内陆、阿拉斯加东南海岸和不列颠哥伦比亚省冰川森林避难所的假说。
Beringia, including Alaska and North-Eastern Siberia, has long been a focal point for biogeographical research in a wide range of plant and animal taxa. Whether boreal forest refugia existed in Beringia during the Last Glacial Maximum (LGM) is a major but unanswered question in Quaternary science. We analysed DNA sequence data from Amanita muscaria using phylogenetic and coalescent methods to test whether this boreal-temperate ectomycorrhizal fungus was present in Alaska during the LGM. Our data indicates that there are at least two endemic groups showing no detectable migration from or to populations that survived the LGM in Southern refugia. One of these occurs in the boreal forests of Interior Alaska, while the other group is endemic to the maritime rainforests from Southeast Alaska to the Olympic peninsula. These results suggest genetic isolation preceding the LGM and support the hypothesis of glacial forest refugia in Interior Alaska and along the coast of Southeast Alaska and British Columbia.