The diversity and distribution of modern planktic foraminiferal small subunit ribosomal RNA genotypes and their potential as tracers of present and past ocean circulations
The diversity and distribution of modern planktic foraminiferal small subunit ribosomal RNA genotypes and their potential as tracers of present and past ocean circulations
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DOI：
10.1029/1998pa900002
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发表时间：
1999-02-01
期刊：
影响因子：
--
通讯作者：
Bijma, J
中科院分区：
文献类型：
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作者：
Darling, KF;Wade, CM;Bijma, J
浮游棘虫有孔虫核糖体小亚基RNA基因的分子系统发育分析表明，形态种可能代表不同且往往高度分化的基因型簇。在某些情况下，分化程度可以证明作为独特的“隐种”的单独分类学地位是合理的。基于化石记录证据的分子进化速率估计表明，这种隐蔽的分化可能发生在数百万年前。对其在加勒比海（热带）、珊瑚海和地中海（亚热带）以及南加州八区（过渡带）分布的调查表明，基因型跨越水团边界进行转运，并提出基因流动方向遵循全球海洋表面环流格局。目前，盛行洋流将热带/亚热带基因型从太平洋输送到南非角周围的大西洋。在冰川期打开的基因走廊中，较冷的水过渡基因型可能从太平洋转移到大西洋。
Molecular phylogenetic analysis of the small subunit ribosomal RNA gene of planktic spinose foraminifers shows that morphospecies may represent clusters of different and often highly divergent genotypes. In some cases the level of divergence may justify separate taxonomic status as distinct "cryptic" species. Molecular evolution rate estimates, based on fossil record evidence, suggest that the cryptic divergences may have occurred many millions of years ago. An investigation of their distribution in the Caribbean (tropical zone), Coral Sea and Mediterranean Sea (subtropical zone), and Southern California Eight (transitional zone) indicates that genotypes are transported across water mass boundaries, and it is proposed that the direction of gene flow follows the prevailing global ocean surface circulation pattern. At the present time the prevailing currents transport tropical/subtropical genotypes from the Pacific to Atlantic around the South African Cape. Cooler water transitional genotypes may transit from Pacific to Atlantic in gene corridors opened during glacial periods.