Seamount endemism questioned by the geographic distribution and population genetic structure of marine invertebrates
Seamount endemism questioned by the geographic distribution and population genetic structure of marine invertebrates
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DOI：
10.1007/s00227-006-0306-4
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发表时间：
2006-05
期刊：
影响因子：
2.4
通讯作者：
S. Samadi;Lionel Bottan;E. Macpherson;B. R. Forges;Marie-Catherine Boisselier
中科院分区：
文献类型：
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作者：
S. Samadi;Lionel Bottan;E. Macpherson;B. R. Forges;Marie-Catherine Boisselier
以前的研究表明，与诺福克海山(西南太平洋)相关的高度多样性可能反映了由于水文现象导致的有限扩散造成的特有现象。在新喀里多尼亚经济区对甲壳类进行了彻底的研究，从而能够分析新喀里多尼亚斜坡和诺福克海脊海山之间的物种分布模式。这一分析表明，定性地说，在海山和新喀里多尼亚斜坡上抽样的是相同的物种。没有检测到当地的地方病。然而，在每座海山上，因此在一个很小的表面上，通常会采样非常多的物种，这表明海山是生物多样性的热点。然后，为了评估海山是否构成了孤立的栖息地，我们探索了几种甲壳类和腹足类动物的遗传多样性模式。使用线粒体标记COI对种内遗传结构的分析表明，该标记具有多态的两个Galatheidae物种(Munida thoe和Munida Zebra)的种群在海山之间以及海山和岛屿斜坡之间都没有遗传结构。两种浮游性腹足类(Sassia Reensa)和一种浮游性腹足类(Sassia Remensa)的相似抽样方案的遗传结构显示出类似的模式。种群结构只在Nassaria problematica中观察到，Nassaria problematica是一种非浮游营养性腹足类，幼虫扩散有限。因此，似乎只有扩散能力有限的物种才能观察到海山之间基因流动的限制。我们的研究结果表明，诺福克海山与其说是地方病的发源地，不如说是可以在小范围内养活大量物种的高生产力地带。
Previous studies have suggested that the high diversity associated with the Norfolk seamounts (Southwest Pacific) could reflect endemism resulting from limited dispersal due to hydrological phenomena. Crustaceans of the family Galatheidae are thoroughly studied in the New Caledonia economic zone permitting the analysis of species distribution pattern between the New Caledonia slope and Norfolk ridge seamounts. This analysis has shown that, qualitatively, the same species are sampled on seamounts and on the New Caledonia slope. Local endemism was never detected. However, on each seamount, and therefore on a small surface, a very high number of species are usually sampled, suggesting that seamounts are biodiversity hot spots. Then, to evaluate whether the seamounts constitute patches of isolated habitat, we explore the pattern of genetic diversity within several species of crustaceans and gastropods. Analysis of the intra-specific genetic structure using the mitochondrial marker COI reveals that populations of two Galatheidae species (Munida thoeandMunida zebra), polymorphic for this marker, are genetically not structured, both among seamounts and between the seamounts and the island slope. The genetic structure over a similar sampling scheme of twoEumunidaspecies (Chirostylidae, the sister family of Galatheidae) and a planktotrophic gastropod (Sassia remensa) reveals a similar pattern. Population structure is observed only inNassaria problematica, a non-planktotrophic gastropod with limited larvae dispersal. Thus, the limitation of gene flow between seamounts appears to be observed only for species with limited dispersal abilities. Our results suggest that the Norfolk seamounts rather than functioning as areas of endemism, instead, may be highly productive zones that can support numerous species in small areas.