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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

Grasslands

Publication Year

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Microbial Community Structure And Functions Differ Between Native And Novel (Exotic-Dominated) Grassland Ecosystems In An 8-Year Experiment, Aleksandra Checinska Sielaff, Racheal N. Upton, Kirsten S. Hofmockel, Xia Xu, H. Wayne Polley, Brian J. Wilsey Nov 2018

Microbial Community Structure And Functions Differ Between Native And Novel (Exotic-Dominated) Grassland Ecosystems In An 8-Year Experiment, Aleksandra Checinska Sielaff, Racheal N. Upton, Kirsten S. Hofmockel, Xia Xu, H. Wayne Polley, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

A Grasslands dominated by non-native (exotic) spe- cies have replaced purely native-dominated areas in many parts of the world forming ‘novel’ ecosystems. Altered precipitation patterns are predicted to exacerbate this trend. It is still poorly understood how soil microbial communities and their functions differ between high diversity native- and low diversity exotic-dominated sites and how altered precipitation will impact this difference.

Methods We sampled 64 experimental grassland plots in central Texas with plant species mixtures of either all native or all exotic species; half with summer irrigation. We tested how native vs. exotic plant species mixtures and summer irrigation affected ...


Phenology Differences Between Native And Novel Exotic‐Dominated Grasslands Rival The Effects Of Climate Change, Brian J. Wilsey, Leanne M. Martin, Andrew D. Kaul Mar 2018

Phenology Differences Between Native And Novel Exotic‐Dominated Grasslands Rival The Effects Of Climate Change, Brian J. Wilsey, Leanne M. Martin, Andrew D. Kaul

Ecology, Evolution and Organismal Biology Publications

1. Novel ecosystems can differ from the native systems they replaced. We used phenology measures to compare ecosystem functioning between novel exotic-dominated and native-dominated grasslands in the central U.S.

2. Phenology, or timing of biological events, is affected by climate and land use changes. We assessed how phenology shifts are being altered by exotic species dominance by comparing remotely sensed Normalized Difference Vegetation Index within growing seasons at exotic- and native-dominated sites along a latitudinal gradient. Exotic species were dominated by the C3 species functional group in the north and the C4 species functional group in the south.

3 ...


Differences In Beta Diversity Between Exotic And Native Grasslands Vary With Scale Along A Latitudinal Gradient, Leanne M. Martin, Brian J. Wilsey Apr 2015

Differences In Beta Diversity Between Exotic And Native Grasslands Vary With Scale Along A Latitudinal Gradient, Leanne M. Martin, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

Biodiversity can be partitioned into alpha, beta, and gamma components, and beta diversity is not as clearly understood. Biotic homogenization predicts that exotic species should lower beta diversity at global and continental scales, but it is still unclear how exotic species impact beta diversity at smaller scales. Exotic species could theoretically increase or decrease beta diversity relative to natives depending on many factors, including abiotic conditions, community assembly history, management, dispersal rates of species, and connectivity among patches. We sampled plant species abundances in 42 novel, exotic- and native-dominated (remnant) grasslands across a latitudinal gradient in the tallgrass prairie region ...