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Type: Journal article
Title: Warming and fertilization alter the dilution effect of host diversity on disease severity
Author: Liu, X.
Lyu, S.
Zhou, S.
Bradshaw, C.
Citation: Ecology, 2016; 97(7):1680-1689
Publisher: Wiley
Issue Date: 2016
ISSN: 1939-9170
Statement of
Xiang Liu, Shengman Lyu, Shurong Zhou, Corey J. A. Bradshaw
Abstract: An essential ecosystem service is the dilution effect of biodiversity on disease severity, yet we do not fully understand how this relationship might change with continued climate warming and ecosystem degradation. We designed removal experiments in natural assemblages of Tibetan alpine meadow vegetation by manipulating plot-level plant diversity to investigate the relationship between different plant biodiversity indices and foliar fungal pathogen infection, and how artificial fertilization and warming affect this relationship. Although pathogen group diversity increases with host species richness, disease severity decreases as host diversity rises (dilution effect). The dilution effect of phylogenetic diversity on disease held across different levels of host species richness (and equal abundances), meaning that the effect arises mainly in association with enhanced diversity itself rather than from shifting abundances. However, the dilution effect was weakened by fertilization. Among indices, phylogenetic diversity was the most parsimonious predictor of infection severity. Experimental warming and fertilization shifted the most supported predictor to species richness. Compared to planting experiments where artificial communities are constructed from scratch, our removal experiment in natural communities more realistically demonstrate that increasing perturbation adjusts natural community resistance to disease severity.
Keywords: Plants
Plant Diseases
Global Warming
Rights: Copyright status unknown
DOI: 10.1890/15-1784.1
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Appears in Collections:Aurora harvest 7
Ecology, Evolution and Landscape Science publications

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