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Reproductive dispersion and damping time scale with life-history speed
Ecology Letters ( IF 8.8 ) Pub Date : 2022-08-04 , DOI: 10.1111/ele.14080
Sha Jiang 1 , Harman Jaggi 1 , Wenyun Zuo 1 , Madan K Oli 2 , Tim Coulson 3 , Jean-Michel Gaillard 4 , Shripad Tuljapurkar 1
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Iteroparous species may reproduce at many different ages, resulting in a reproductive dispersion that affects the damping of population perturbations, and varies among life histories. Since generation time (Tc) is known to capture aspects of life-history variation, such as life-history speed, does Tc also determine reproductive dispersion (S) or damping time (τ)? Using phylogenetically corrected analyses on 633 species of animals and plants, we find, firstly, that reproductive dispersion S scales isometrically with Tc. Secondly, and unexpectedly, we find that the damping time (τ) does not scale isometrically with generation time, but instead changes only as Tcb with b<1 (also, there is a similar scaling with S). This non-isometric scaling implies a novel demographic contrast: increasing generation times correspond to a proportional increase in reproductive dispersion, but only to a slower increase in the damping time. Thus, damping times are partly decoupled from the slow-fast continuum, and are determined by factors other than allometric constraints.

中文翻译:

具有生命史速度的生殖色散和阻尼时间尺度

迭代繁殖的物种可能在许多不同的年龄繁殖,导致繁殖分散,影响种群扰动的阻尼,并且在不同的生活史中有所不同。自世代以来(C) 已知可以捕捉生活史变化的各个方面,例如生活史速度,确实C还确定生殖分散(小号) 或阻尼时间 (τ)? 通过对 633 种动植物的系统发育校正分析,我们发现,首先,生殖分散小号等距缩放C. 其次,出乎意料的是,我们发现阻尼时间 (τ) 不随生成时间等距缩放,而是仅随时间变化Cbb<1(另外,也有类似的缩放比例小号)。这种非等距缩放意味着一种新的人口统计对比:增加的世代时间对应于生殖分散的成比例增加,但仅对应于阻尼时间的较慢增加。因此,阻尼时间与慢-快连续体部分分离,并且由异速生长约束以外的因素决定。
更新日期:2022-08-04
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