Diane Larson is a Research Wildlife Biologist with the USGS Northern Prairie Wildlife Research Center and is stationed at the St. Paul, Minnesota duty station.
What is a functional prairie ecosystem? Where can we begin to address such a huge question? With only a tiny fraction of the once vast prairies remaining, understanding their key functions and how to best preserve or reconstruct these functions is of utmost importance. Questions may begin with vegetation, but quickly propagate downward into soil communities and processes and upward to pollinators and herbivores. These are the motivations for my research.
My goals are to assist resource managers in ways that improve sustainability. Prairie reconstructions that both express the range of species planted and are resistant to noxious weeds, thereby minimizing subsequent management inputs, are more sustainable than those that degenerate into weedy fields in need of repeated herbicide applications. Can we improve planting methods and seed mixes to better achieve sustainable prairies?
Functioning ecosystems support mutualists, herbivores, commensals, predators. How will legacies of prior land use and vegetation impinge on these functions? Can we mitigate negative legacies? Create positive legacies to improve outcomes? What roles do invasive plant species play? If they support mutualists such as pollinators, how will we sustain these mutualists while controlling weeds?
Science and Products
Sourcing plants for conservation and restoration: developing a risk assessment framework
Tallgrass prairie species are planted in a variety of settings for a variety of reasons. Much of the seed used for these plantings is produced commercially in agricultural-like conditions and can be contaminated by “weed seeds.” In this study, we are creating an analytical tool to assess the risk of inadvertently introducing weed seeds into a prairie planting. We purpose that increasing the...
Developing evaluation and monitoring frameworks for tallgrass prairie reconstruction
Thousands of hectares of retired farmland are planted with tallgrass prairie species each year. If the methods used and resulting characteristics of these prairies are recorded, compiled, and analyzed, they can provide a valuable resource for evaluating seed mixes, planting methods, and post-planting management. Toward this end, collaborators in the Prairie Reconstruction Initiative, funded by the...
Evaluation of tallgrass prairie restoration methods to improve resistance to invasive species and maintenance of plant species diversity over time
When reconstructing native tallgrass prairie from abandoned farmland, patience can pay off. In this research effort, we observed that as reconstructions matured, Canada thistle cover declined even though herbicides were not applied. There is no single best planting method for all situations. Ten years after planting, cover of planted, native non-planted, and exotic species varied little among...
Evaluation of conservation grazing versus prescribed fire to manage tallgrass prairie remnants for plant and pollinator species diversity
With scarcely 2% of native tallgrass prairie remaining today, it is imperative that we wisely manage what little remains to conserve prairie-dependent plants, pollinators, other animals and ecosystem processes. Two commonly used methods of prairie management are prescribed fire and conservation grazing. Either method may present trade-offs with respect to conservation of vulnerable plant, bee or...
Effects of invasive plant species on reproduction of the rare endemic plant Dakota buckwheat (Eriogonum visheri) at Badlands National Park
Endemism in plants is extremely uncommon in the Great Plains. Dakota buckwheat is a rare, endemic plant found in only a few locations at Badlands National Park and sites with similar soils outside the park. In an earlier study, Northern Prairie Wildlife Research Center inferred that of two common, co-flowering invasive plants, Russian thistle was more likely than yellow sweetclover to interfere...
To control or not to control: response of pollinator communities to invasive plant management
If invasive plants are producing pollen and nectar used by native pollinators, what happens when a manager decides to control the invasive plant? Northern Prairie Wildlife Research Center is addressing this question and has found that pollinators are adept at changing their resource acquisition strategies as abundantly flowering invasive species decline. In addition, it appears that the invasive...
Relocating Plants for Conservation and Restoration: Developing a Risk Assessment Framework
There is growing interest in the facilitated movement of plants as a means of conserving or restoring species and habitats, as climate conditions and management goals change. For example, plants might be relocated to support pollinator conservation or the restoration of prairies. Some land managers, in an effort to be proactive in the face of changing environmental conditions, are also considering
Science and Products
- Science
Sourcing plants for conservation and restoration: developing a risk assessment framework
Tallgrass prairie species are planted in a variety of settings for a variety of reasons. Much of the seed used for these plantings is produced commercially in agricultural-like conditions and can be contaminated by “weed seeds.” In this study, we are creating an analytical tool to assess the risk of inadvertently introducing weed seeds into a prairie planting. We purpose that increasing the...Developing evaluation and monitoring frameworks for tallgrass prairie reconstruction
Thousands of hectares of retired farmland are planted with tallgrass prairie species each year. If the methods used and resulting characteristics of these prairies are recorded, compiled, and analyzed, they can provide a valuable resource for evaluating seed mixes, planting methods, and post-planting management. Toward this end, collaborators in the Prairie Reconstruction Initiative, funded by the...Evaluation of tallgrass prairie restoration methods to improve resistance to invasive species and maintenance of plant species diversity over time
When reconstructing native tallgrass prairie from abandoned farmland, patience can pay off. In this research effort, we observed that as reconstructions matured, Canada thistle cover declined even though herbicides were not applied. There is no single best planting method for all situations. Ten years after planting, cover of planted, native non-planted, and exotic species varied little among...Evaluation of conservation grazing versus prescribed fire to manage tallgrass prairie remnants for plant and pollinator species diversity
With scarcely 2% of native tallgrass prairie remaining today, it is imperative that we wisely manage what little remains to conserve prairie-dependent plants, pollinators, other animals and ecosystem processes. Two commonly used methods of prairie management are prescribed fire and conservation grazing. Either method may present trade-offs with respect to conservation of vulnerable plant, bee or...Effects of invasive plant species on reproduction of the rare endemic plant Dakota buckwheat (Eriogonum visheri) at Badlands National Park
Endemism in plants is extremely uncommon in the Great Plains. Dakota buckwheat is a rare, endemic plant found in only a few locations at Badlands National Park and sites with similar soils outside the park. In an earlier study, Northern Prairie Wildlife Research Center inferred that of two common, co-flowering invasive plants, Russian thistle was more likely than yellow sweetclover to interfere...To control or not to control: response of pollinator communities to invasive plant management
If invasive plants are producing pollen and nectar used by native pollinators, what happens when a manager decides to control the invasive plant? Northern Prairie Wildlife Research Center is addressing this question and has found that pollinators are adept at changing their resource acquisition strategies as abundantly flowering invasive species decline. In addition, it appears that the invasive...Relocating Plants for Conservation and Restoration: Developing a Risk Assessment Framework
There is growing interest in the facilitated movement of plants as a means of conserving or restoring species and habitats, as climate conditions and management goals change. For example, plants might be relocated to support pollinator conservation or the restoration of prairies. Some land managers, in an effort to be proactive in the face of changing environmental conditions, are also considering - Data
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