Frequency-dependent disease transmission and the dynamics of the 'Silene-Ustilago' host-pathogen system
Article Abstract:
A basic density dependent transmission model and two other models, combining essential details of the Silene-Ustilago host-pathogen system with frequency-dependent disease transmission, illustrate that host individuals are either infected, sterile and infective, or uninfected, in which case all individuals are prone to infection. Disease transmission is considered a probability function in which the possibility of infection is directly affected by the quantitative nature of vector contacts. Hosts and pathogens can exist simultaneously in vector-transmitted and sexually transmitted disease systems when transmission depends more on frequency than on density.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1995
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Consequences of host population levels of increasing natural enemy species richness in classical biological control
Article Abstract:
Sufficient competition and hyperparasitism increase host population levels when additional parasitoid species invade the system. Host inflation occurs when direct interference is initiated by the invading parasitoid or when it disables the resident natural enemy species. Biological control of natural enemies through direct interference requires that the host maintain high population levels in the absence of the enemies and that the invading species be climatically adapted to the host.
Publication Name: The American Naturalist
Subject: Earth sciences
ISSN: 0003-0147
Year: 1996
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