Molecular evidence of cryptic speciation in planktonic foraminifers and their relation to oceanic provinces
Molecular evidence of cryptic speciation in planktonic foraminifers and their relation to oceanic provinces
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DOI：
10.1073/pnas.96.6.2864
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发表时间：
1999-03-16
影响因子：
11.1
通讯作者：
Pawlowski, J
中科院分区：
文献类型：
--
作者：
de Vargas, C;Norris, R;Pawlowski, J
浮游有孔虫的化石记录是一把钥匙。作为海洋浮游生物多样性和进化的数据来源，Orbulina universa是最具特色的有孔虫类群之一，被广泛用作地层和古气候指标，一直被视为单一物种。在这里，我们提出了一个系统发育分析Orbulina小亚基rDNA，序列从25个远洋站，覆盖100度的纬度在大西洋。遗传数据显示存在三个神秘的物种，其分布明显相关的水文省，特别是海面总叶绿素a浓度。我们的研究结果，以及以前的研究，表明，相当一部分的多样性之间的浮游有孔虫已被忽视的形态分类，我们的数据也支持这样的想法，即浮游有孔虫，即使适应特定的水文条件，是高分散的生物，其物种形成可能类似于其他高分散类群，其中生殖机制和行为，而不仅仅是地理上的扩散障碍，在物种的形成和维持中发挥着关键作用。
The fossil record of planktonic foraminifers is a key. source of data on the biodiversity and evolution of marine plankton, One of the most distinctive foraminiferal taxa, Orbulina universa, widely used as a stratigraphic and paleoclimatic index, has always been regarded as a single species. Here we present a phylogenetic analysis of Orbulina small subunit rDNA, sequences from 25 pelagic stations covering 100 degrees latitude in the Atlantic Ocean. The genetic data reveal the presence of three cryptic species, whose distribution is clearly correlated to hydrographic provinces, and particularly to sea-surface total chlorophyll a concentration. Our results, together with previous studies, suggest that a considerable part of the diversity among planktonic foraminifers has been overlooked in morphological taxonomies, Our data also support the idea that planktonic foraminifers, even if adapted to particular hydrographic conditions, are high-dispersal organisms whose speciation may be similar to that of other high-dispersal taxa in which reproductive mechanisms and behavior, rather than just geographic barriers to dispersal, play key roles in species formation and maintenance.