The phylogenetic relationships of whale-fall vesicomyid clams based on mitochondrial COI DNA sequences
The phylogenetic relationships of whale-fall vesicomyid clams based on mitochondrial COI DNA sequences
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DOI：
10.3354/meps182137
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发表时间：
1999-01-01
影响因子：
2.5
通讯作者：
Vrijenhoek, RC
中科院分区：
文献类型：
--
作者：
Baco, AR;Smith, CR;Vrijenhoek, RC
深海海底的鲸鱼骨架提供了富含硫化物的栖息地，可以作为依赖化学自养生产的动物扩散的垫脚石。然而，鲸鱼瀑布、热液喷口和感冒渗漏的动物群之间的系统发育关系尚未得到充分评价。为了研究维塞米蚌的系统发育关系，我们从加利福尼亚边缘的两个鲸鱼瀑布中收集了10只维塞米蚌，一个在圣卡塔利娜盆地1240米处，另一个在圣尼古拉斯岛西部斜坡960米处。然后，我们比较了鲸鱼骨架蛤的线粒体细胞色素c氧化酶亚基I基因的一部分DNA序列与这个分类学上困难的科中其他蛤种群的DNA序列。7只成年的落鲸贝与蛤蜊聚集在一起，被鉴定为Vesicomya gigas，这一物种也在瓜伊马斯盆地（加利福尼亚湾）和中部山谷（胡安德富卡山脊）的热液喷口附近发现。在瓜伊马斯盆地、蒙特利湾和俄勒冈州俯冲带的寒冷地带发现的一种被称为Calyptogena kilmeri的蛤蜊聚集在一起的单个小鲸鱼个体。一只小的落鲸蛤与长形Calyptogena聚集在一起，这是一种在缺氧的加利福尼亚盆地发现的物种。最后，单个成年蛤很难被分配到任何先前研究过的物种组中，并且可能代表“gigas/kilmeri”神秘物种复合体中的新物种。包括这些维塞科动物，鲸鱼瀑布与深海热液喷口和冷渗漏的动物群共有16种。
Whale skeletons on the deep-sea floor provide sulfide-rich habitats that may act as stepping stones for the dispersal of animals dependent on chemoautotrophic production. However, the phylogenetic relationships between the faunas of whale falls, hydrothermal vents and colds seeps are not fully evaluated. Tb examine vesicomyid phylogenetic relationships, we collected 10 vesicomyid clams from 2 whale falls on the California margin, one at 1240 m in the Santa Catalina Basin and one at 960 m on the slope west of San Nicolas Island. We then compared DNA sequences for a portion of the mitochondrial cytochrome c oxidase subunit I gene from the whale-skeleton clams to those from other clam populations in this taxonomically difficult family. Seven adult whale-fall vesicomyids clustered with clams identified as Vesicomya gigas, a species also found near hydrothermal vents in Guaymas Basin (Gulf of California) and Middle Valley (Juan de Fuca Ridge). A single small whale-fall individual clustered with clams identified as Calyptogena kilmeri, a species found at cold seeps in Guaymas Basin, Monterey Bay, and along the Oregon Subduction Zone. A single small whale-fall clam clustered with Calyptogena elongata, a species found in anoxic California basins. Finally, a single adult clam was difficult to assign to any previously examined species group and could represent a new species in the 'gigas/kilmeri'' cryptic species complex. With the inclusion of these vesicomyids, whale falls are known to share a total of 16 species with the faunas of deep-sea hydrothermal vents and cold seeps.