A5006321106- Ecology and Vegetation Dynamics Studies
- Rangeland and Wildlife Management
- Plant and animal studies
- Fire effects on ecosystems
- Species Distribution and Climate Change
- Botany, Ecology, and Taxonomy Studies
- Plant Parasitism and Resistance
- Agronomic Practices and Intercropping Systems
- Animal Ecology and Behavior Studies
- Isotope Analysis in Ecology
- Insect-Plant Interactions and Control
- Biological Control of Invasive Species
- Landslides and related hazards
- Physiological and biochemical adaptations
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Wildlife Ecology and Conservation
- Botany and Plant Ecology Studies
- Agricultural Productivity and Crop Improvement
- Logic, Reasoning, and Knowledge
- Hydrology and Drought Analysis
- Environmental Toxicology and Ecotoxicology
- Insect Utilization and Effects
- Insect and Pesticide Research
- Ecology and biodiversity studies
University of Nebraska at Kearney
2021-2024
Colorado State University
2011-2023
Kansas State University
2002-2013
University of Oslo
2010
Homeostasis of element composition is one the central concepts ecological stoichiometry. In this context, homeostasis resistance to change consumer body in response chemical consumer's food. To simplify theoretical analysis, it has generally been assumed that autotrophs exhibit flexibility their composition, while heterotrophs are confined a constant (strictly homeostatic) composition. Yet, recent studies suggest not universally strictly homeostatic. We examined degree which and regulate...
Abstract Revegetation by seeding is an important tool in restoration. Seeding practices for restoration often rely on standard prescriptions seed mix diversity and rates. Seed rates are generally low within projects these typically not informed research. The objective of this study was to explore a new method determining optimal rate semiarid grassland. We examined success associated with differing levels (5–50 species) (400–1,600 pure live seeds [ PLS ]/m 2 ) using response surface...
The fundamental goal of a rare plant translocation is to create self-sustaining populations with the evolutionary resilience persist in long term. Yet, most syntheses focus on few factors influencing short-term benchmarks success (e.g., survival and reproduction). Short-term can be misleading when trying infer future growth viability because that promote establishment may differ from those required for long-term persistence. We assembled large (n = 275) broadly representative data set...
Better understanding the influence of precipitation and temperature on plant assemblages is needed to predict effects climate change. Many studies have examined relationship between productivity weather (primarily precipitation), but few directly assessed richness or diversity despite their increased use as metrics ecosystem condition. We focus grasslands central North America, which are characterized by high temporal climatic variability. Over next 100 years, these predicted experience...
Pinyon-juniper (Pinus spp.–Juniperus spp.) encroachment and declining mule deer (Odocoileus hemionus) populations in western Colorado have necessitated management for increased forage. removal is one such technique; however, it unclear which method of tree most effectively promotes forage species. We conducted an experiment to quantify understory responses mechanical pinyon-juniper seed additions a blocked design using three different methods: anchor-chaining, rollerchopping, mastication....
Alewives Alosa pseudoharengus are native to the Atlantic Coast but have been introduced inland waters as forage for sportfish populations. Alewife introductions benefitted growth and body condition also negatively influenced larval fish survival through predation or competition zooplankton. In 1986, alewives were stocked into Lake McConaughy, Nebraska, became abundant self-sustaining shortly thereafter. It has since hypothesized that alewife introduction altered zooplankton size species...
Macroinvertebrate communities in a central Kansas grassland were examined to assess their responses differences land management and explore viability for biological assessment of grasslands. Canopy (drop-trap) ground-dwelling (pitfall traps) quantitatively sampled from June-September 1998 1999. The the whole arthropod community two focal groups, Coleopteran families Orthopteran species, three use types (brome fields, old native prairies) examined. Vegetation analyses reflected clear among...
Abstract 1. Factors affecting the nutritional ecology of mixed‐feeding, polyphagous herbivores are poorly understood. Mixed‐feeding do better when they consume both forb and grass species although typically feed primarily on forbs, which relatively higher protein content than grasses. 2. In a field experiment, we examined effects nitrogen phosphorus fertilization associated changes in host‐plant C:N:P proportional consumption by mixed‐feeding insect herbivore, Melanoplus bivittatus , using...
Abstract Key elements such as nitrogen (N) and phosphorus (P) are often limiting relative to the nutritional needs of herbivores that feed on them. While N limits insect in natural terrestrial ecosystems, effect P is poorly studied field, even though compelling hypotheses from ecological stoichiometry literature predict its importance. We evaluated small‐scale spatial distributions of, herbivory by, grasshoppers among neighboring plots vary foliar‐N ‐P tallgrass prairie. Grasshopper...
Summary 1. Plant community succession has been a major area of study over the past century with recent research focusing on importance initial colonisers following disturbance. Seed addition can accelerate ecosystem regeneration and is method commonly used by land managers to restore disturbed lands. However, few studies have examined effects seeding treatments long‐term composition. 2. A was established in 1984 Piceance Basin northwest Colorado examine how various revegetation seed mixes...
Increasing fire frequencies and uncharacteristic severe fires have created a need for improved restoration methods across rangelands in western North America. Traditional seed mixtures of native perennial mid- to late-seral plant species may not be suitable intensely burned sites that been returned an early-seral condition. Under such conditions, annual are likely more successful at becoming established competing with exotic species, as Bromus tectorum L., resources. We used field study...
Homeostasis of element composition is one the central concepts ecological stoichiometry. In this context, homeostasis resistance to change consumer body in response chemical consumer's food. To simplify theoretical analysis, it has generally been assumed that autotrophs exhibit flexibility their composition, while heterotrophs are confined a constant (strictly homeostatic) composition. Yet, recent studies suggest not universally strictly homeostatic. We examined degree which and regulate...
Although consequences of limited dietary protein and carbohydrate to performance are well studied for terrestrial insect herbivores, the importance phosphorus (P) remains poorly understood. We examined significance P in fifth-instar nymphs grasshopper Melanoplus bivittatus fed artificial diets. Consumption, digestion, developmental rate, growth response different levels nested within standard-Protein diets were determined. Developmental rate was slowest on high-P diets; protein:carbohydrate...
Abstract The geometric framework provides a way for understanding the multi‐dimensional nutritional relationships between consumers and their food. We use this approach to further our of feeding ecology ubiquitous mixed‐feeding insect herbivore that consumes variety host plants spanning wide range composition. Our overall objective was examine decisions, resulting performance, post‐ingestive consequences in common herbivore, M elanoplus bivittatus ( S ay) O rthoptera: A crididae), when...
Abstract Exotic plant invasion can have dramatic impacts on native plants making restoration of vegetation at invaded sites challenging. Though invasives may be superior competitors, it is possible their dominance could enhanced by insect herbivores if are preferred food sources. Insect herbivory regulate populations, but little known its effects in settings. There a need to better understand relationships between and invasive with regard combined potential for impacting establishment...
Jayne L. Jonas (corresponding author), Colorado State University, Department of Forest and Rangeland Stewardship, Fort Collins, CO 80523-1472, jayne.jonas-bratten{at}colostate.edu.