Effect of spatial connectivity on host resistance in a highly fragmented natural pathosystem
Autor: | Anna-Liisa Laine, Jukka Sirén, Layla Höckerstedt |
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Přispěvatelé: | Research Centre for Ecological Change, Organismal and Evolutionary Biology Research Programme, Plant Biology, Faculty of Biological and Environmental Sciences, Ecology and Evolutionary Biology, Viikki Plant Science Centre (ViPS), Doctoral Programme in Plant Sciences, Doctoral Programme in Wildlife Biology, University of Helsinki, Department of Computer Science, Aalto-yliopisto, Aalto University |
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
0301 basic medicine Epidemiology Local adaptation Antagonistic Coevolution Allopatric speciation DIVERSITY Metapopulation MALADAPTATION Biology migration Polymorphism Single Nucleotide 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Pathosystem Evolutionary arms race Ascomycota natural populations LOCAL ADAPTATION host-pathogen interactions DNA Fungal Plantago PARASITE COEVOLUTION Migration Ecology Evolution Behavior and Systematics Demography Plant Diseases ta113 Experimental evolution Host-pathogen interactions Research Papers Natural populations EVOLUTION INFECTIOUS-DISEASE DYNAMICS 030104 developmental biology Evolutionary biology Sympatric speciation FOR-GENE COEVOLUTION coevolution 1181 Ecology evolutionary biology PATTERNS POPULATIONS epidemiology PLANT-PATHOGEN METAPOPULATION Research Paper host–pathogen interactions Coevolution |
Zdroj: | Journal of Evolutionary Biology |
Popis: | Both theory and experimental evolution studies predict migration to influence the outcome of antagonistic coevolution between hosts and their parasites, with higher migration rates leading to increased diversity and evolutionary potential. Migration rates are expected to vary in spatially structured natural pathosystems, yet how spatial structure generates variation in coevolutionary trajectories across populations occupying the same landscape has not been tested. Here, we studied the effect of spatial connectivity on host evolutionary potential in a natural pathosystem characterized by a stable Plantago lanceolata host network and a highly dynamic Podosphaera plantaginis parasite metapopulation. We designed a large inoculation experiment to test resistance of five isolated and five well-connected host populations against sympatric and allopatric pathogen strains, over 4 years. Contrary to our expectations, we did not find consistently higher resistance against sympatric pathogen strains in the well-connectedpopulations. Instead, host local adaptation varied considerably among populations and through time with greater fluctuations observed in the well-connected populations. Jointly, our results suggest that in populations where pathogens have successfully established, they have the upper hand in the coevolutionary arms race, but hosts may be better able to respond to pathogen-imposed selection in the well-connected than in the isolated populations. Hence, the ongoing and extensive fragmentation of natural habitats may increase vulnerability to diseases. |
Databáze: | OpenAIRE |
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