Mitochondrial DNA reveals monophyly of New Zealand’s Gobiomorphus (Teleostei: Eleotridae) amongst a morphological complex
Mitochondrial DNA reveals monophyly of New Zealand’s Gobiomorphus (Teleostei: Eleotridae) amongst a morphological complex
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线粒体 DNA 揭示了新西兰 Gobiomorphus（Teleostei：Eleotridae）在形态复合体中的单系性
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
B. Hicks
中科院分区：
文献类型：
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作者：
M. Stevens;B. Hicks
目标：研究Gobiomorphus内的系统发育关系，以探索澳大拉西亚的地理，起源（单一或多个），和海洋生物阶段的进化损失（diadromy的损失）。研究方法：我们使用系统发育分析分析的线粒体DNA（Cyt-b）的片段，并使用几个meristics（棘，射线和椎骨）的判别函数分析。微生物：虾虎鱼属（学名：Gobiomorphus）的所有9个物种都在新西兰和澳大利亚发现，其中两个澳大利亚的Philypnodon物种被列为外群分类群。结论：该属和所有7个新西兰种的单系性得到了强有力的支持。新西兰的虎鱼可能是一次引进的结果，自中新世或上新世（约1800 - 2800万年前）以来就从澳大利亚分离出来。这些日期与新西兰最古老的化石在1600万至2000万年的日期相吻合。Diadromy一直在新西兰组的根，和非diadromy和形态多样化，这些物种之间似乎已经发生相对最近，与meristic比较支持的分子分析。然而，在非溯河产卵的形式，物种形态对比的分子数据表明最近的进化历史的生态选择。
Goal: To examine the phylogenetic relationships within Gobiomorphus to explore Australasian biogeography, origins (single or multiple), and evolutionary loss of a marine life stage (loss of diadromy). Methods: We analyse a fragment of the mitochondrial DNA (Cyt-b) using phylogenetic analyses, and use several meristics (spines, rays, and vertebrae) in a discriminant function analysis. Organisms: All nine species of the genus Gobiomorphus (Eleotridae) found in New Zealand and Australia, with the two Australian Philypnodon species included as outgroup taxa. Conclusions: Monophyly of the genus and all seven New Zealand species was strongly supported. The New Zealand Gobiomorphus are likely to be the result of a single introduction and to have been isolated from Australia since the Miocene or Pliocene (∼18–28 Myr ago). These dates correspond well to the oldest fossil in New Zealand dated at 16–20 Myr. Diadromy was consistently at the root of the New Zealand group, and non-diadromy and morphological diversification among these species appears to have occurred relatively recently, with meristic comparisons supporting the molecular analyses. However, among the non-diadromous forms, species morphology contrasts with the molecular data suggesting a recent evolutionary history driven by ecological selection.