Homeorhesis and ecological succession quantified in synthetic microbial ecosystems

被引:24
作者
Chuang, John S. [1 ,2 ]
Frentz, Zak [1 ,2 ,4 ]
Leibler, Stanislas [1 ,2 ,3 ]
机构
[1] Rockefeller Univ, Lab Living Matter, New York, NY 10065 USA
[2] Rockefeller Univ, Ctr Studies Phys & Biol, New York, NY 10065 USA
[3] Inst Adv Study, Simons Ctr Syst Biol, Olden Lane, Princeton, NJ 08540 USA
[4] Columbia Univ, Coll Phys & Surg, Dept Microbiol & Immunol, New York, NY 10032 USA
关键词
microbial ecology; ecological succession; contingency and determinism; CANALIZATION; COMMUNITIES; NETWORK;
D O I
10.1073/pnas.1901055116
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The dynamics of ecological change following a major perturbation, known as succession, are influenced by random processes. Direct quantitation of the degree of contingency in succession requires chronological study of replicate ecosystems. We previously found that population dynamics in carefully controlled, replicated synthetic microbial ecosystems were strongly deterministic over several months. Here, we present simplified, two-species microbial ecosystems consisting of algae and ciliates, imaged in toto at single-cell resolution with fluorescence microscopy over a period of 1 to 2 weeks. To directly study succession in these ecosystems, we deliberately varied the initial cell abundances over replicates and quantified the ensuing dynamics. The distribution of abundance trajectories rapidly converged to a nearly deterministic path, with small fluctuations, despite variations in initial conditions, environmental perturbations, and intrinsic noise, indicative of homeorhesis. Homeorhesis was also observed for certain phenotypic variables, such as partitioning of the ciliates into distinct size classes and clumping of the algae. Although the mechanism of homeorhesis observed in these synthetic ecosystems remains to be elucidated, it is clear that it must emerge from the ways each species controls its own internal states, with respect to a diverse set of environmental conditions and ecological interactions.
引用
收藏
页码:14852 / 14861
页数:10
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