Data from: Interactions among symbionts operate across scales to influence parasite epidemics
Halliday, Fletcher W., University of North Carolina
Umbanhowar, James, University of North Carolina
Mitchell, Charles E., University of North Carolina
Published Jul 28, 2018 on Dryad.
Cite this dataset
Halliday, Fletcher W.; Umbanhowar, James; Mitchell, Charles E. (2018). Data from: Interactions among symbionts operate across scales to influence parasite epidemics [Dataset]. Dryad. https://doi.org/10.5061/dryad.8h007
Parasite epidemics may be influenced by interactions among symbionts, which can depend on past events at multiple spatial scales. Within host individuals, interactions can depend on the sequence in which symbionts infect a host, generating priority effects. Across host individuals, interactions can depend on parasite phenology. To test the roles of parasite interactions and phenology in epidemics, we embedded multiple cohorts of sentinel plants, grown from seeds with and without a vertically transmitted symbiont, into a wild host population, and tracked foliar infections caused by three common fungal parasites. Within hosts, parasite growth was influenced by coinfections, but coinfections were often prevented by priority effects among symbionts. Across hosts, parasite phenology altered host susceptibility to secondary infections, symbiont interactions and ultimately the magnitude of parasite epidemics. Together, these results indicate that parasite phenology can influence parasite epidemics by altering the sequence of infection and interactions among symbionts within host individuals.
The dataset contains 11 columns, described below.
date = date that the leaf was surveyed for infection
Tiller = tiller number on the plant (for some plants, the original tiller had to be replaced)
ID = Plant ID number.
Endophyte = Infection status of the seed by the fungal endophyte, Epichloë coenophiala.
Leaf = Leaf number, indicating the relative age of each leaf on a tiller, with lower numbers corresponding to older leaves.
LeafID = a unique ID for each leaf (combination of ID, Tiller, and Leaf).
cohort = The experimental cohort the plant ID belongs to. There were three cohorts. The first cohort was placed on 22 June 2015, during the Colletotrichum epidemic, but before other parasite epidemics began. The second cohort was placed on 27 July 2015, shortly after the start of the Rhizoctonia epidemic, but before the Puccinia epidemic began. The third cohort was placed on 21 September 2015, shortly after the start of the Puccinia epidemic, when all three parasites were present.
leaf.emergence = the date that each leaf emerged. For leaves that emerged before the start of the experiment, this date was set to the date that the plant was placed in the field.
Puccinia, Colletotrichum, Rhizoctonia = the percent leaf area damaged by Puccinia, Colletotrichum, and Rhizoctonia, respectively. This is a measurement of infection severity.