Molecular phylogenetic perspective on the evolution of the deep-sea fish genusCyclothone (Stomiiformes: Gonostomatidae)
Molecular phylogenetic perspective on the evolution of the deep-sea fish genusCyclothone (Stomiiformes: Gonostomatidae)
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深海鱼类Cyclothone（Stomiiformes：Gonostomatidae）进化的分子系统发育视角
DOI：
10.1007/bf02347637
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发表时间：
1996
影响因子：
1.2
通讯作者：
M. Nishida
中科院分区：
文献类型：
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作者：
M. Miya;M. Nishida
对目前已知的13种中水深海鱼类圆口鱼属（Cyclothone）（口形目：角口鱼科）和3种角口鱼科外类群的12 S和16 S核糖体RNA基因进行了部分序列测定。系统发育分析，使用最大简约法和最大似然法进行了明确对齐，两个基因的组合序列（803 bp）。从这两种方法得到的树拓扑结构是一致的，是强大的，并支持各种树的统计，使进化历史ofCyclothone的详细描述。分子遗传学表现出惊人的不一致性与先前提出的“自然群体”，虽然后者可以自信地反驳的分子数据。最显着的特点的进化史ofCyclothone是独立收购的apomorphic深度栖息地从相对祖先，较低的中层栖息地，由三个主要的不同的血统，在他们的进化早期分歧。此外，这种宏观进化栖息地的变化必然伴随着形态和生态的新颖性，可能起源于幼态。这种变化的重复进化强烈表明个体发育可塑性inCyclothone，这可能使这些鱼类获得幼虫样，简单的身体结构的组织。这样的身体计划可以帮助它们在食物匮乏的环境中生存，并调节生殖变量，利用增加幼虫向浅深度生存的优势。最近的物种形成事件，相反，产生了同时代的姐妹种的异域（或微异域）分布，但很少有形态和生态差异。即使已经发生了显著的小型化，例如在地中海特有的。因此，它必须是祖先物种个体发育的简单截断，而没有任何可辨别的幼态特征。根据化石记录、地中海地区的地质历史和外温分子发散率，估计Cyclothone辐射在中新世早期-中期（1700 - 2000万年前）就已经开始。
A portion of mitochondrially encoded 12S and 16S ribosomal RNA genes were sequenced from 13 currently recognized species of the midwater deep-sea fish genusCyclothone (Stomiiformes: Gonostomatidae) and three gonostomatid outgroup taxa. Phylogenetic analyses using maximum parsimony and maximum likelihood methods were performed on unambiguously aligned, combined sequences (803 bp) of the two genes. The resultant tree topologies from the two methods were congruent, being robust and supported by various tree statistics, enabling the evolutionary history ofCyclothone to be described in detail. The molecular phylogeny demonstrated striking inconsistencies with previously proposed “natural groups”, although the latter could be confidently refuted by the molecular data. The most significant characteristic of the evolutionary history ofCyclothone was the independent acquisition of an apomorphic depth habitat from the relatively ancestral, lower mesopelagic habitat, by each of three major distinct lineages that had diverged earlier in their evolution. Moreover, such macroevolutionary habitat shifts had been necessarily accompanied by morphological and ecological novelties, presumably originating from paedomorphosis. Repeated evolution of such changes strongly suggests ontogenetic plasticity inCyclothone which could enable these fishes to acquire larval-like, simple organization of body structure. Such a body plan could help them subsist in food-poor surroundings and regulate reproductive variables that take advantage of increasing larval survival toward shallower depths. Recent speciation events, on the contrary, have produced contemporary sister species of allopatric (or microallopatric) distributions, but few morphological and ecological differences. Even if remarkable miniaturization has occurred, such as in the Mediterranean endemicC. pygmaea, it had to have been a simple truncation of ancestral species' ontogeny without attendance of any discernible paedomorphic features. On the basis of the fossil record, geological history of the Mediterranean region, and ectotherm molecular divergence rate, it was estimated thatCyclothone radiation had already started in the early-middle Miocene (17–20 million years ago).
影响因子：
3.3
作者：
TEMPLETON, AR
通讯作者：
TEMPLETON, AR
Watabe，H.；Liang，X.C.：动物学。
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