Canopy flow analysis reveals the advantage of size in the oldest communities of multicellular eukaryotes.
Canopy flow analysis reveals the advantage of size in the oldest communities of multicellular eukaryotes.
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冠层流量分析揭示了最古老的多细胞真核生物社区的大小的优势。
DOI：
10.1016/j.cub.2013.12.017
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发表时间：
2014-02-03
期刊：
影响因子：
--
通讯作者：
Jacobs DK
中科院分区：
文献类型：
--
作者：
Ghisalberti M;Gold DA;Laflamme M;Clapham ME;Narbonne GM;Summons RE;Johnston DT;Jacobs DK
At Mistaken Point, Newfoundland, Canada, rangeomorph “fronds” dominate the earliest (579–565 million years ago) fossil communities of large (0.1 to 2 m height) multicellular benthic eukaryotes. They lived in low-flow environments, fueled by uptake of dissolved reactants (osmotrophy). However, prokaryotes are effective osmotrophs, and the advantage of taller eukaryotic osmotrophs in this deepwater community context has not been addressed. We reconstructed flow-velocity profiles and vertical mixing using canopy flow models appropriate to the densities of the observed communities. Further modeling of processes at organismal surfaces documents increasing uptake with height in the community as a function of thinning of the diffusive boundary layer with increased velocity. The velocity profile, produced by canopy flow in the community, generates this advantage of upward growth. Alternative models of upward growth advantage based on redox/resource gradients fail, given the efficiency of vertical mixing. In benthic communities of osmotrophs of sufficient density, access to flow in low-flow settings provides an advantage to taller architecture, providing a selectional driver for communities of tall eukaryotes in contexts where phototropism cannot contribute to upward growth. These Ediacaran deep-sea fossils were preserved during the increasing oxygenation prior to the Cambrian radiation of animals and likely represent an important phase in the ecological and evolutionary transition to more complex eukaryotic forms.
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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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影响因子：
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