Sammanfattning

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.

Nyckelord

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

Publicerad i

Ecology
2017, Volym: 98, nummer: 10, sidor: 2574-2584
Utgivare: WILEY

SLU författare

• Ekholm, Adam

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    

• Roslin, Tomas

  • Institutionen för ekologi, Sveriges lantbruksuniversitet
    
  • Helsingin yliopisto

Associerade SLU-program

SLU Nätverk växtskydd


UKÄ forskningsämne

Ekologi


Publikationens identifierare

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

Permanent länk till denna sida (URI)

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