Theoretical implications for the evolution of postsegregational killing by bacterial plasmids
Article Abstract:
The observation of post-segregational killing of host bacteria by certain plasmids led to the hypothesis that killer plasmids (KP) may be engaged in a form of spiteful behavior. However, a model of the dynamics of plasmid and bacterial populations showed that KP can gain a selfish advantage only under highly restrictive conditions, that is, when they have high initial density, high transfer rates to cells with competing plasmids and if they are incompatible with the competing plasmid. Thus, postsegregational killing may not be the only reason for the maintenance of KP in bacterial populations.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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On the evolution of masting behavior in trees: predation or weather?
Article Abstract:
The role of parasites in selection for masting behavior in initially non-masting trees was investigated. The results showed that evolution of masting behavior is possible only when parasites are aggregated and the trees tend towards synchronized fluctuations in seed production as a result of weather-mediated resource availability. Synchronized fluctuations in seed production begins as a weather-dependent strategy for optimization of resources for reproduction. However, seed parasites subsequently take over as the dominant factor selecting for masting.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1992
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Senescence in organisms with clonal reproduction and complex life histories
Article Abstract:
A population genetics model helps reveal the inducement of senescence in organisms with clonal reproduction and complex life histories by allele frequency changes. These organisms are widely prevalent in marine invertebrates and higher plant taxa. The population growth rate sensitivity, fitness types and changes in life-history parameters are the factors affecting the prevalence of these alleles. The evolution of senescence is also affected by clonal reproduction.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1995
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