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Abstract

Dispersal, environment and genetic variation may all play a role in shaping host-parasite dynamics. Yet, in natural systems, their relative importance remains unresolved. Here, we do so for the epidemiology of a specialist parasite (Erysiphe alphitoides) on the pedunculate oak (Quercus robur). For this purpose, we combine evidence from a multi-year field survey and two dispersal experiments, all conducted at the landscape scale. Patterns detected in the field survey suggest that the parasite is structured as a metapopulation, with trees in denser oak stands characterized by higher parasite occupancy, higher colonization rates and lower extinction rates. The dispersal experiments revealed a major impact of the environment and of host genotype on the presence and abundance of the parasite, with a weaker but detectable imprint of dispersal limitation. Overall, our findings emphasize that dispersal, host genotype and the environment jointly shape the spatial dynamics of a parasite in the wild.

Keywords

colonization; disease dynamics; dispersal; epidemiology; Erysiphe alphitoides; host-parasite interaction; landscape scale; metapopulation; pedunculate oak; powdery mildew; Quercus robur; spatial dynamics

Published in

Ecology
2017, volume: 98, number: 10, pages: 2574-2584
Publisher: WILEY

SLU Authors

Associated SLU-program

SLU Plant Protection Network

UKÄ Subject classification

Ecology

Publication identifier

  • DOI: https://doi.org/10.1002/ecy.1949

Permanent link to this page (URI)

https://res.slu.se/id/publ/92949