Is the diatom sex clock a clock?

Is the diatom sex clock a clock?
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硅藻性别时钟是时钟吗?

DOI:
10.1098/rsif.2021.0146
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发表时间:
2021-06
期刊:
Journal of the Royal Society, Interface
影响因子:
--
通讯作者:
Seiler W
Seiler W
中科院分区:
其他
文献类型:
--
作者:
Fuhrmann-Lieker T;Kubetschek N;Ziebarth J;Klassen R;Seiler W

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硅藻独特的生命周期,细胞大小不断减小和恢复,导致细胞大小分布的周期性波动,被认为是一个多年时钟。为了分析地理解种群的长期行为,一般数学模型在代数和数值上进行了研究,因为它们具有描述周期振荡的能力。尽管普遍接受的增殖动力学的简单概念由于尺寸分布的扩大而不能维持振荡行为,但模拟表明,新合成的细胞壁的有限寿命将向定常平衡状态的松弛减慢到十万代的顺序。结合季节性扰动事件,有限寿命的增殖方案能够解释硅藻种群动态特征的长期节律。因此,生命周期就像一个钟摆,必须不时地受到季节扰动的影响而上紧发条,而不是一个用极限环表示的振荡器。
The unique life cycle of diatoms with continuous decreasing and restoration of the cell size leads to periodic fluctuations in cell size distribution and has been regarded as a multi-annual clock. To understand the long-term behaviour of a population analytically, generic mathematical models are investigated algebraically and numerically for their capability to describe periodic oscillations. Whereas the generally accepted simple concepts for the proliferation dynamics do not sustain oscillating behaviour owing to broadening of the size distribution, simulations show that a proposed limited lifetime of a newly synthesized cell wall slows down the relaxation towards a time-invariant equilibrium state to the order of a hundred thousand generations. In combination with seasonal perturbation events, the proliferation scheme with limited lifetime is able to explain long-lasting rhythms that are characteristic for diatom population dynamics. The life cycle thus resembles a pendulum clock that has to be wound up from time to time by seasonal perturbations rather than an oscillator represented by a limit cycle.
DOI: 10.1016/j.jtbi.2004.01.003
发表时间: 2004-05-21
影响因子: 2
作者:
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期刊: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
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