The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution.
The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution.
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DOI：
10.1371/journal.pone.0198003
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Tanimura Y
中科院分区：
文献类型：
--
作者：
Hayashi T;Krebs WN;Saito-Kato M;Tanimura Y
化石证据表明，现代温带非海洋浮游硅藻组合开始于中/晚中新世界线附近，当时早中新世至中中新世期间湖相浮游硅藻组合的重要组成部分Actinocyclus属被Stephanodiscaceae科属所取代。这种植物的营业额已被证实在世界上许多地区，除了亚洲东部的早，中中新世浮游硅藻组合的分类数据，直到最近还很少。我们对日本中新世中、下两个时期湖相沉积岩的分析证实，非海相放线菌也是湖泊浮游植物的重要组成部分。中新世初期非海相辐环藻种的出现可能是由于当时海平面上升时广盐性物种进入湖泊环境的结果。同样地，Stephanodiscaceae的物种也可能是从海洋海栖类祖先演化而来，这些祖先在多个古近纪高位入侵高纬度湖泊环境，导致该科的多系起源。营业额从nonmarine Actinocyclus Stephanodiscaceae属附近的中/晚中新世的边界可能与同期的增加，在湖泊中的二氧化硅浓度所造成的活火山活动，增加风化的硅酸盐岩石由于orthopolysaccharide，和C4草原的扩张。这种营业额也可能受到增强的季节性环境变化的影响，在真光层的季风条件和全球范围内的温度梯度在中新世晚期增加的启动所造成的。Stephanodiscaceae属的形态特征，如支撑的过程和小尺寸，表明他们的物种更好地适应季节性环境变化比非海洋种的放线菌，因为他们的优势，在浮动和漂移能力和可能的新陈代谢，内在的增长率，和繁殖力。随着中新世晚期气候的恶化，千金藤科物种可能从高纬度扩散到温带湖泊，在那里它们多样化，最终取代了放线菌属。
Fossil evidence indicates that modern assemblages of temperate nonmarine planktonic diatoms began near the middle/late Miocene boundary when the genus Actinocyclus, an important constituent of lacustrine planktonic diatom assemblages during the early to middle Miocene, was replaced by genera of the family Stephanodiscaceae. This floral turnover has been confirmed in many regions of the world, except eastern Asia where taxonomic data about early and middle Miocene planktonic diatom assemblages have until recently been scarce. Our analysis of Lower and Middle Miocene lacustrine diatomaceous rocks in Japan confirms that species of nonmarine Actinocyclus were important constituents of lake phytoplankton there as well. The appearance of nonmarine Actinocyclus species near the beginning of the Miocene may have resulted from the introduction of euryhaline species into lacustrine environments during a highstand of sea level at that time. Similarly, it is possible that species of Stephanodiscaceae evolved from marine thalassiosiroid ancestors that invaded high latitude lacustrine environments during multiple Paleogene highstands, resulting in a polyphyletic origin of the family. The turnover from nonmarine Actinocyclus to Stephanodiscaceae genera near the middle/late Miocene boundary may be linked to a contemporaneous increase in silica concentrations in lakes caused by active volcanism, increased weathering of silicate rocks due to orogeny, and the expansion of C4 grasslands. This turnover may also have been influenced by enhanced seasonal environmental changes in the euphotic zone caused by the initiation of monsoon conditions and a worldwide increase in meridional temperature gradients during the late Miocene. Morphological characteristics of Stephanodiscaceae genera, such as strutted processes and small size, suggest their species were better adapted to seasonal environmental changes than nonmarine species of Actinocyclus because of their superiority in floating and drifting capabilities and possibly metabolism, intrinsic growth rate, and reproductivity. As climates deteriorated during the late Miocene, Stephanodiscaceae species may have spread from high latitudes to temperate lakes where they diversified, ultimately displacing Actinocyclus.
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影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
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