Abstract
Large herbivores and topo-edaphic gradients are well-documented, major determinants of grassland plant production and species composition. In contrast, there is limited information about how these factors together may influence the composition of the arbuscular mycorrhizal fungus (AMF) communities associated with plants. AMF are a common component of grassland ecosystems where they can influence plant productivity, diversity, and soil stability. In this study, AMF community composition was analyzed in paired plots located inside and outside 40-44-year-old ungulate exclosures at six grassland sites in Yellowstone National Park (YNP), USA, that varied in soil moisture and the availability of soil nitrogen (N) and phosphorus (P). AMF spore abundance, species richness, and the relative abundance of AMF species were determined from soil samples collected (1) randomly (n = 5 samples) within each of the 12 plots and (2) from beneath the dominant grass (n = 5 samples per plot) at each site. Randomly collected soil samples explored the effects of ungulates and topographic position on AMF composition at the plant community level, subsuming potential effects of ungulates on plant species composition. Dominant plant samples examined how grazers, in particular, influenced AMF communities, while controlling for host-plant identity. Grazing decreased AMF spore abundance across the landscape (examined by random sampling) but increased the AMF species richness associated with dominant plants. Grazing influenced the AMF species composition at the plant community level and at the host-plant level by shifting the relative abundances of individual AMF species. Individual AMF species responded differently to grazing and N and P availability. Our results demonstrate how soil moisture and N and P availability across the landscape interact with grazing to influence AMF species composition.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 815-827 |
| Number of pages | 13 |
| Journal | Ecology |
| Volume | 91 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2010 |
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Keywords
- AMF
- Arbuscular mycorrhiza
- Grassland
- Grazing
- Mutualism
- N:P
- Phosphorus
- Species composition
- Ungulate
- USA
- Yellowstone National Park
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
Cite this
Ungulate and topographic control of arbuscular mycorrhizal fungal spore community composition in a temperate grassland. / Murray, Tanya R.; Frank, Douglas A.; Gehring, Catherine A.
In: Ecology, Vol. 91, No. 3, 03.2010, p. 815-827.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ungulate and topographic control of arbuscular mycorrhizal fungal spore community composition in a temperate grassland
AU - Murray, Tanya R.
AU - Frank, Douglas A.
AU - Gehring, Catherine A
PY - 2010/3
Y1 - 2010/3
N2 - Large herbivores and topo-edaphic gradients are well-documented, major determinants of grassland plant production and species composition. In contrast, there is limited information about how these factors together may influence the composition of the arbuscular mycorrhizal fungus (AMF) communities associated with plants. AMF are a common component of grassland ecosystems where they can influence plant productivity, diversity, and soil stability. In this study, AMF community composition was analyzed in paired plots located inside and outside 40-44-year-old ungulate exclosures at six grassland sites in Yellowstone National Park (YNP), USA, that varied in soil moisture and the availability of soil nitrogen (N) and phosphorus (P). AMF spore abundance, species richness, and the relative abundance of AMF species were determined from soil samples collected (1) randomly (n = 5 samples) within each of the 12 plots and (2) from beneath the dominant grass (n = 5 samples per plot) at each site. Randomly collected soil samples explored the effects of ungulates and topographic position on AMF composition at the plant community level, subsuming potential effects of ungulates on plant species composition. Dominant plant samples examined how grazers, in particular, influenced AMF communities, while controlling for host-plant identity. Grazing decreased AMF spore abundance across the landscape (examined by random sampling) but increased the AMF species richness associated with dominant plants. Grazing influenced the AMF species composition at the plant community level and at the host-plant level by shifting the relative abundances of individual AMF species. Individual AMF species responded differently to grazing and N and P availability. Our results demonstrate how soil moisture and N and P availability across the landscape interact with grazing to influence AMF species composition.
AB - Large herbivores and topo-edaphic gradients are well-documented, major determinants of grassland plant production and species composition. In contrast, there is limited information about how these factors together may influence the composition of the arbuscular mycorrhizal fungus (AMF) communities associated with plants. AMF are a common component of grassland ecosystems where they can influence plant productivity, diversity, and soil stability. In this study, AMF community composition was analyzed in paired plots located inside and outside 40-44-year-old ungulate exclosures at six grassland sites in Yellowstone National Park (YNP), USA, that varied in soil moisture and the availability of soil nitrogen (N) and phosphorus (P). AMF spore abundance, species richness, and the relative abundance of AMF species were determined from soil samples collected (1) randomly (n = 5 samples) within each of the 12 plots and (2) from beneath the dominant grass (n = 5 samples per plot) at each site. Randomly collected soil samples explored the effects of ungulates and topographic position on AMF composition at the plant community level, subsuming potential effects of ungulates on plant species composition. Dominant plant samples examined how grazers, in particular, influenced AMF communities, while controlling for host-plant identity. Grazing decreased AMF spore abundance across the landscape (examined by random sampling) but increased the AMF species richness associated with dominant plants. Grazing influenced the AMF species composition at the plant community level and at the host-plant level by shifting the relative abundances of individual AMF species. Individual AMF species responded differently to grazing and N and P availability. Our results demonstrate how soil moisture and N and P availability across the landscape interact with grazing to influence AMF species composition.
KW - AMF
KW - Arbuscular mycorrhiza
KW - Grassland
KW - Grazing
KW - Mutualism
KW - N:P
KW - Phosphorus
KW - Species composition
KW - Ungulate
KW - USA
KW - Yellowstone National Park
UR - http://www.scopus.com/inward/record.url?scp=77950399083&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77950399083&partnerID=8YFLogxK
U2 - 10.1890/09-0209.1
DO - 10.1890/09-0209.1
M3 - Article
C2 - 20426339
AN - SCOPUS:77950399083
VL - 91
SP - 815
EP - 827
JO - Ecology
JF - Ecology
SN - 0012-9658
IS - 3
ER -