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Individual Variation And Ecotypic Niches In Simulations Of The Impact Of Climatic Volatility, George P. Malanson, R. Justin Derose, Matthew F. Bekker
Individual Variation And Ecotypic Niches In Simulations Of The Impact Of Climatic Volatility, George P. Malanson, R. Justin Derose, Matthew F. Bekker
Wildland Resources Faculty Publications
Expectations of the impacts of climatic variation on species can depend on whether and how intraspecific variability is incorporated in models. Coefficients of variation from tree-ring records of Pinus albicaulis through time and across space were used to parameterize volatility and individuality, respectively. The records across sites were used to differentiate the average modes on an environmental gradient for Gaussian fitness of ecotypic niches, and to add further individual variation in mode and standard deviation of these functions in individual-based Monte Carlo simulations of reproduction and mortality with inheritance of individual variability. Ecotypic gamma and Shannon diversity decreased with volatility …
Plant-Soil Feedbacks Provide An Alternative Explanation For Diversity-Productivity Relationships, Andrew Kulmatiski, Karen H. Beard, Justin Heavilin
Plant-Soil Feedbacks Provide An Alternative Explanation For Diversity-Productivity Relationships, Andrew Kulmatiski, Karen H. Beard, Justin Heavilin
Wildland Resources Faculty Publications
Plant–soil feedbacks (PSFs) have gained attention for their role in plant community dynamics, but their role in productivity has been overlooked. We developed and tested a biomass-specific, multi-species model to examine the role of PSFs in diversity–productivity relationships. The model predicts a negative relationship between PSFs and overyielding: plants with negative PSFs grow more in communities than in monoculture (i.e. overyield), and plants with positive PSFs grow less in communities than in monoculture (i.e. underyield). This effect is predicted to increase with diversity and saturate at low species richness because the proportion of ‘self-cultivated’ soils rapidly decreases as species are …