Molecular and morphological evolution of the amphipod radiation of Lake Baikal
Molecular and morphological evolution of the amphipod radiation of Lake Baikal
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DOI：
10.1016/j.ympev.2005.01.013
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发表时间：
2005-05-01
影响因子：
4.1
通讯作者：
Duffy, JE
中科院分区：
文献类型：
--
作者：
Macdonald, KS;Yampolsky, L;Duffy, JE
俄罗斯西伯利亚的贝加尔湖拥有现存湖泊中最高的生物多样性，包括令人印象深刻的伽马类片脚类动物，它们经常被引用为适应性辐射的经典案例。然而，贝加尔湖的片脚类动物之间的关系仍然知之甚少。32贝加尔湖端足类物种的系统发育史，代表最主要的血统的特有动物群，使用三个基因（COI，16S rRNA，和18S rRNA），和152个形态特征进行了检查。结果支持单系的最大和最多样化的贝加尔湖的家庭，的dogammaridae。分析表明，第二个贝加尔湖家庭，fossorial Micruropodidae，是并系的，由两个不同的分支，其中之一包括Macrohectopus branickii，一个形态专门的浮游食鱼传统上分配自己的家庭。极端的形态和生态分歧Macrohectopus从其密切的遗传亲属，相反，大的遗传距离之间的其他形态相似的micruropodids，表明形态和分子进化往往是不耦合的贝加尔湖的端足类动物的辐射。这项研究表明，贝加尔湖的端足动物区系是多系的，起源于两个独立的入侵湖泊。(c)2005年爱思唯尔公司All rights reserved.
Lake Baikal, in Siberia, Russia, contains the highest biodiversity of any extant lake, including an impressive radiation of gammaroidean amphipods that are often cited as a classic case of adaptive radiation. However, relationships among Baikal's amphipods remain poorly understood. The phylogenetic history of 32 Lake Baikal amphipod species, representing most major lineages of the endemic fauna, was examined using three genes (COI, 16S rRNA, and 18S rRNA), and 152 morphological characters. Results support monophyly of the largest and most diverse of the Baikalian families, the Acanthogammaridae. Analyses suggest that a second Baikalian family, the fossorial Micruropodidae, is paraphyletic and composed of two divergent clades, one of which includes Macrohectopus branickii, a morphologically specialized pelagic planktivore traditionally assigned its own family. The extreme morphological and ecological divergence of Macrohectopus from its close genetic relatives, and conversely, the large genetic distances among other morphologically similar micruropodids, suggest that morphological and molecular evolution have often been uncoupled during the radiation of Baikal's amphipods. This study suggests that the amphipod fauna of Lake Baikal is polyphyletic; originating from two independent invasions of the lake. (c) 2005 Elsevier Inc. All rights reserved.