東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Emergent Behaviors in Complex Microb...

Hu, Jiliang,

Linked to FindBook

Google Book

Amazon

博客來

Emergent Behaviors in Complex Microbial Ecosystems /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Emergent Behaviors in Complex Microbial Ecosystems // Jiliang Hu.
Author:	Hu, Jiliang,
Description:	1 electronic resource (191 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
Contained By:	Dissertations Abstracts International86-05B.
Subject:	Phylogenetics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31652321
ISBN:	9798346383536

Emergent Behaviors in Complex Microbial Ecosystems /
Hu, Jiliang,

Emergent Behaviors in Complex Microbial Ecosystems /Jiliang Hu. - 1 electronic resource (191 pages)

Source: Dissertations Abstracts International, Volume: 86-05, Section: B.

From tropical forests to gut microbiomes, ecological communities harbor diverse and abundant species. Understanding the complex emergent phenomena of diversity, stability, and invasibility in these communities within a unified framework has been a significant challenge. My PhD thesis addresses this knowledge gap by conducting the first direct test of a theory proposing that simple community-level features govern emergent behaviors. By utilizing bacterial microcosms, we demonstrate that as the number of species or the strength of interactions increases, microbial ecosystems transition through three distinct dynamical phases: from stable coexistence, to partial coexistence, to the emergence of persistent fluctuations and alternative stable states in species abundances, confirming theoretical predictions. Notably, high biodiversity and dynamic fluctuations reinforce each other under fixed conditions. By combining theoretical frameworks and microbial community experiments, we establish that community-level features determine the invasion outcome in microbial communities. We found that the communities with fluctuations in species abundance are more invasible and diverse than stable ones, leading to a positive diversity-invasibility relationship. As predicted by theory, increasing interspecies interaction strength and size of species pool leads to a decrease of invasion probability in our experiment. Although diversity-invasibility relationships are qualitatively different depending upon how the diversity is changed, we resolved the diversity-invasibility debate by showing a universal positive correspondence between invasibility and survival fraction across all conditions. Communities composed of strongly interacting species can exhibit an emergent priority effect in which invader species are less likely to colonize than species in the original pool. However, in this regime of strong interspecies interactions, if an invasion is successful it causes larger ecological effects on the resident community than when interactions are weak. Overall, this thesis uncovers predictable emergent patterns of diversity, dynamics, and invasibility in ecological communities, offering insights into a unified framework for microbial ecology.

English

ISBN: 9798346383536Subjects--Topical Terms:

3561778
Phylogenetics.

Emergent Behaviors in Complex Microbial Ecosystems /
LDR:03462nmm a22003733i 4500 001 2435747
005 20251029060341.5
006 m o d
007 cr|nu||||||||
008 261011s2024 miu||||||m |||||||eng d
020 $a 9798346383536
035 $a (MiAaPQD)AAI31652321
035 $a (MiAaPQD)MIT1721_1_153719
035 $a AAI31652321
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Hu, Jiliang, $e author. $3 3826158
245 1 0 $a Emergent Behaviors in Complex Microbial Ecosystems / $c Jiliang Hu.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (191 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
500 $a Advisors: Gore, Jeff.
502 $b Ph.D. $c Massachusetts Institute of Technology $d 2024.
520 $a From tropical forests to gut microbiomes, ecological communities harbor diverse and abundant species. Understanding the complex emergent phenomena of diversity, stability, and invasibility in these communities within a unified framework has been a significant challenge. My PhD thesis addresses this knowledge gap by conducting the first direct test of a theory proposing that simple community-level features govern emergent behaviors. By utilizing bacterial microcosms, we demonstrate that as the number of species or the strength of interactions increases, microbial ecosystems transition through three distinct dynamical phases: from stable coexistence, to partial coexistence, to the emergence of persistent fluctuations and alternative stable states in species abundances, confirming theoretical predictions. Notably, high biodiversity and dynamic fluctuations reinforce each other under fixed conditions. By combining theoretical frameworks and microbial community experiments, we establish that community-level features determine the invasion outcome in microbial communities. We found that the communities with fluctuations in species abundance are more invasible and diverse than stable ones, leading to a positive diversity-invasibility relationship. As predicted by theory, increasing interspecies interaction strength and size of species pool leads to a decrease of invasion probability in our experiment. Although diversity-invasibility relationships are qualitatively different depending upon how the diversity is changed, we resolved the diversity-invasibility debate by showing a universal positive correspondence between invasibility and survival fraction across all conditions. Communities composed of strongly interacting species can exhibit an emergent priority effect in which invader species are less likely to colonize than species in the original pool. However, in this regime of strong interspecies interactions, if an invasion is successful it causes larger ecological effects on the resident community than when interactions are weak. Overall, this thesis uncovers predictable emergent patterns of diversity, dynamics, and invasibility in ecological communities, offering insights into a unified framework for microbial ecology.
546 $a English
590 $a School code: 0753
650 4 $a Phylogenetics. $3 3561778
650 4 $a Endangered & extinct species. $3 3560222
650 4 $a Carbon. $3 604057
650 4 $a Casting. $3 3826159
650 4 $a Phase transitions. $3 3560387
650 4 $a Eigenvalues. $3 631789
650 4 $a Biomass. $3 1013462
650 4 $a Nutrients. $3 3562665
650 4 $a Extinction. $3 3685255
650 4 $a Genetics. $3 530508
650 4 $a Systematic biology. $3 3173492
690 $a 0369
690 $a 0423
710 2 $a Massachusetts Institute of Technology. $b Department of Mechanical Engineering. $e degree granting institution. $3 3817004
720 1 $a Gore, Jeff $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-05B.
790 $a 0753
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31652321