Diversity and persistence of arbuscular mycorrhizas in a low-Arctic meadow habitat.
Little is known about the ecology and diversity of arbuscular mycorrhizal (AM) fungi in Arctic ecosystems. Here, the diversity and composition of the AM fungal community and its response to host plant community composition were studied in a low-Arctic meadow habitat. The natural vegetation in two low-Arctic meadow sites was manipulated. Plots with natural vegetation, monoculture and no vegetation were established. Seeds of Solidago virgaurea were sown into the plots and the AM fungal community in the seedling roots was analysed using the terminal restriction fragment length polymorphism (T-RFLP) method. The vegetation manipulation treatments affected the community composition but not the diversity of AM fungi found in S. virgaurea roots. The diversity of AM fungi was higher in S. virgaurea roots in the site with naturally higher plant species diversity. These results show that AM fungi in low-Arctic meadows are able to survive for a period of 2 yr without a host plant. This ability buffers the AM fungal community against short-term changes in host plant community composition and diversity.
Pietikäinen
Anne
A
Department of Biology, PO Box 3000, FIN-90014 University of Oulu, Oulu, Finland.
Kytöviita
Minna-Maarit
MM
Department of Biology, PO Box 3000, FIN-90014 University of Oulu, Oulu, Finland.
Husband
Rebecca
R
Department of Biology, University of York, PO Box 373, York YO10 5YW, UK.
Young
J Peter W
JPW
Department of Biology, University of York, PO Box 373, York YO10 5YW, UK.
D001110:Arctic Regions; D003081:Cold Climate; D003247:Conservation of Natural Resources; D017753:Ecosystem; D038821:Mycorrhizae / Q000502:physiology*; D036226:Seedlings / Q000254:growth & development / Q000382:microbiology*; D036624:Solidago / Q000254:growth & development / Q000382:microbiology*; D013559:Symbiosis / Q000502:physiology*