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Permanent link (DOI): https://doi.org/10.7939/R3WW77229

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Direct and indirect drivers of plant diversity responses to climate and clipping across northern temperate grassland Open Access

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Author or creator
White, S. R.
Bork, E. W.
Cahill Jr, J. F.
Additional contributors
Subject/Keyword
rangeland
manipulative experiment
multisite
global warming
land use
defoliation
climate change
richness
grazing
evenness
structural equation modeling
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
It is well known that climate can influence plant community assembly via a multitude of indirect and direct pathways. However, interpretations of plant diversity responses to simulated climate change experiments, and subsequent predictions of plant communities under future climate scenarios, rarely address the importance of indirect effects. Networks of direct and indirect effects are also critical in understanding linkages between climate and grazing, a common land use of grasslands, and implications for plant diversity. We characterized the roles of indirect vs. direct effects in determining plant diversity responses to climate and grazing using data from three northern temperate grasslands in which we conducted factorial experiments manipulating precipitation, air temperature, and clipping intensity. Utilizing a structural equation modeling framework to address the multivariate networks, we found warming operated directly, causing species loss at all sites. We identified shoot biomass as the key indirect driver of diversity loss in response to both precipitation and clipping, regardless of site. However, site-specific contingencies in the network of interactions were important for understanding varied precipitation effects. At the driest site only, shoot biomass was resistant to reduced precipitation, and diversity was consequently unaltered. Similarly, disconnect between primary drivers and responses explained relatively idiosyncratic responses of evenness compared to richness. Importantly, the finding of widespread, directly controlled plant diversity loss with warming aligns with concerns about declining biodiversity under climate change. However, using a framework of network interactions also allowed us to pinpoint the source of variability in response across systems. Looking forward, we can use the identification of this key indirect pathway to guide an understanding of community assembly under factors likely to control shoot biomass. Viewing a multifactorial, multisite experimental approach through a framework of network interactions allowed us to both identify generalized responses and distill the complexity of contingent responses. This, along with the practical need to identify diversity responses to climate change and grazing, underscores the importance of understanding both indirect and direct drivers of ecosystem responses to global change factors.
Date created
2014
DOI
doi:10.7939/R3WW77229
License information
Rights
@2014 White, S. R., Bork, E. W., Cahill Jr, J. F. This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Shannon R. White, Edward W. Bork, and James F. Cahill, Jr. (2014). Direct and indirect drivers of plant diversity responses to climate and clipping across northern temperate grassland. Ecology, 95(11), 3093–3103.  http://dx.doi.org/10.1890/14-0144.1

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