Stability of A Coevolving Host-parasite System Peaks at Intermediate Productivity

Autor: Quan-Guo Zhang, Xin-Feng Zhao, Yi-Qi Hao
Jazyk: angličtina
Rok vydání: 2017
Předmět:
0106 biological sciences
0301 basic medicine
Conservation Biology
Population Dynamics
lcsh:Medicine
01 natural sciences
Bacteriophages
lcsh:Science
Conservation Science
education.field_of_study
Experimental evolution
Extinction threshold
Multidisciplinary
Ecology
Viruses
Host-Pathogen Interactions
Pseudomonas Phages
Research Article
Evolutionary Processes
Antagonistic Coevolution
Population
Biology
Pseudomonas fluorescens
Microbiology
Models
Biological
010603 evolutionary biology
Evolution
Molecular
03 medical and health sciences
Population Metrics
Parasite Evolution
education
Evolutionary dynamics
Species Extinction
Coevolution
Population Density
Extinction event
Evolutionary Biology
Bacterial Evolution
Extinction
Population Biology
Ecology and Environmental Sciences
lcsh:R
Organisms
Biology and Life Sciences
Bacteriology
Organismal Evolution
030104 developmental biology
Microbial Evolution
Parasitology
lcsh:Q
Zdroj: PLoS ONE, Vol 12, Iss 1, p e0168560 (2017)
PLoS ONE
ISSN: 1932-6203
Popis: Habitat productivity may affect the stability of consumer-resource systems, through both ecological and evolutionary mechanisms. We hypothesize that coevolving consumer-resource systems show more stable dynamics at intermediate resource availability, while very low-level resource supply cannot support sufficiently large populations of resource and consumer species to avoid stochastic extinction, and extremely resource-rich environments may promote escalatory arms-race-like coevolution that can cause strong fluctuations in species abundance and even extinction of one or both trophic levels. We tested these ideas by carrying out an experimental evolution study with a model bacterium-phage system (Pseudomonas fluorescens SBW25 and its phage SBW25Φ2). Consistent with our hypothesis, this system was most stable at intermediate resource supply (fewer extinction events and smaller magnitude of population fluctuation). In our experiment, the rate of coevolution between bacterial resistance and phage infectivity was correlated with the magnitude of population fluctuation, which may explain the different in stability between levels of resource supply. Crucially, our results are consistent with a suggestion that, among the two major modes of antagonistic coevolution, arms race is more likely than fluctuation selection dynamics to cause extinction events in consumer-resource systems. This study suggests an important role of environment-dependent coevolutionary dynamics for the stability of consumer-resource species systems, therefore highlights the importance to consider contemporaneous evolutionary dynamics when studying the stability of ecosystems, particularly those under environmental changes.
Databáze: OpenAIRE
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