Published Papers by MPG Scientists
Block title
Ecological Engineering
Biocrusts Lichen and Moss
The term biological soil crust (or biocrust) encompasses the diverse community of moss, algae, lichens, and cyanobacteria living within the top inch of soil. Biocrusts form in all terrestrial ecotypes, but people often overlook them in favor of larger species. Biocrusts stabilize the soil by aggregation, reducing erosion. They increase soil fertility by enhancing nutrient cycling. A healthy biocrust increases infiltration and plays a role in succession towards a diverse and functioning ecosystem. They are especially important in arid and semi-arid ecosystems.
Towards the goal of restoring land to healthy ecosystem function, we consider all facets of the land, not just the vascular plants that may inhabit it. Unaided, biocrusts may take from decades to a century to reestablish after degradation. We would like to determine the most effective and practical methods to restore biological soil crusts.
Research and updates found here include projects on moss, lichens, and biocrust as we delve into this charismatic and important part of the ecosystem.
New Phytologist
Soils Plants and Invasion
Plants live in tight associations with microbes who colonize their roots and leaves and surrounding soil. Some microbes are harmful and cause disease while others are beneficial and aid in plant nutrient uptake, decomposition of organic materials, protection against pathogens, tolerance against drought and other stressors. Plants can influence microbial communities and vice versa with consequences for the growth of individual plants, the composition of plant communities, and entire ecosystems. In our work, we focus on three main aspects of plant-microbe interactions; 1) how they may aid or hinder plant invasions, 2) how their function changes across environmental gradients, and 3) how they may both cause and prevent disease in plants.On MPG Ranch, three highly invasive weeds of contrasting lie history strategies (cheatgrass, knapweed and leafy spurge) co-occur with remnants of native plant vegetation. Using both observational and experimental approaches, we seek to understand how these weeds alter microbial communities and how this influence invasive success, ecosystem properties and restoration. We also collaborate with researchers from across the world to learn if plant-microbe interactions differ between native and invasive ranges and how this correlates with evolutionary shifts in plant genomes and biogeographical distribution of plant associated microbes.
Outcomes of plant-soil microbe interactions depend on the particular plant and fungal species and surrounding environmental conditions. To explore this context-dependency, we use high-throughput sequencing and stable and radioactive isotopes in surveys and experiments to determine if the proportion of fungal guilds (mutualistic mycorrhizal fungi and potential pathogens) change with water and nutrient availability and how these changes relate to plant growth. Because most research occurs in single locations, the generality of findings across locations that differ in environmental conditions is often unknown. To address this, MPG Ranch is part of two global research collaborations, Nutrient Network (https://nutnet.org) and DroughtNet (www.drought-net.org). In these experiments, all researchers apply nutrients, remove herbivores, expose plants to drought, and record responses in both plant and microbial communities using the same protocols, which allow for direct comparisons across sites.
The invasive fungal pathogen, Cronartium ribicola, causes the disease commonly known as blister rust in all nine white pine species native to the United States. As one of the only labs in the world to grow C. ribicola in culture, we perform tests of pathogen metabolism when exposed to compounds produced by other fungi found in white pine needles. Greenhouse experiments inoculating trees with these fungi, as well as beneficial ectomycorrhizal fungi, explore how we can improve tree growth and disease resistance. We also use isotopes and controlled field experiments to determine how blue-stain fungi carried by bark beetles can influence wood decomposition in forest ecosystems. As warming climates increase the frequency of bark beetle outbreaks worldwide, this research will help to better estimate future forest carbon storage and release.
Journal of Mammalogy
Mammals
We seek to understand the distribution and abundance of mammals. Several monitoring projects are underway.
Elk- Elk numbers fluctuate through the year with herds of several hundred animals moving onto the ranch in the fall and winter. Fewer elk stay around to raise their calves in the spring and summer. We track herd size, the habitat they use for feeding, and the amount of biomass available to them for forage. We are curious about how elk habits will change in response to changes in vegetation communities as restoration activities proceed.
Bears- The lower elevation draws and drainages at MPG were de-vegetated by herbicide applications and sheep and cattle browsing. As of the summer 2012, we have planted more than 30,000 trees and shrubs in these drainages. The plantings will provide cover for animals using the draw bottoms as travel corridors between the upland forests and the floodplain forests. Many of the shrubs we have planted, such as hawthorns, choke cherries, and serviceberry, will provide food for bears. Our bear monitoring efforts seek to document how many bears we have now and where they travel.
Click here for a link to a list of mammals we have seen and photos.
Click here for links to our best mammal footage.
We would like to do more small mammal research. Please contact us with ideas for collaboration. (Click here to contact us.)
The Journal of Wlldlife Management
Mammals
We seek to understand the distribution and abundance of mammals. Several monitoring projects are underway.
Elk- Elk numbers fluctuate through the year with herds of several hundred animals moving onto the ranch in the fall and winter. Fewer elk stay around to raise their calves in the spring and summer. We track herd size, the habitat they use for feeding, and the amount of biomass available to them for forage. We are curious about how elk habits will change in response to changes in vegetation communities as restoration activities proceed.
Bears- The lower elevation draws and drainages at MPG were de-vegetated by herbicide applications and sheep and cattle browsing. As of the summer 2012, we have planted more than 30,000 trees and shrubs in these drainages. The plantings will provide cover for animals using the draw bottoms as travel corridors between the upland forests and the floodplain forests. Many of the shrubs we have planted, such as hawthorns, choke cherries, and serviceberry, will provide food for bears. Our bear monitoring efforts seek to document how many bears we have now and where they travel.
Click here for a link to a list of mammals we have seen and photos.
Click here for links to our best mammal footage.
We would like to do more small mammal research. Please contact us with ideas for collaboration. (Click here to contact us.)
Forestry: An International Journal of Forest Research
Global Ecology and Biogeography
Biological Conservation
Mammals
We seek to understand the distribution and abundance of mammals. Several monitoring projects are underway.
Elk- Elk numbers fluctuate through the year with herds of several hundred animals moving onto the ranch in the fall and winter. Fewer elk stay around to raise their calves in the spring and summer. We track herd size, the habitat they use for feeding, and the amount of biomass available to them for forage. We are curious about how elk habits will change in response to changes in vegetation communities as restoration activities proceed.
Bears- The lower elevation draws and drainages at MPG were de-vegetated by herbicide applications and sheep and cattle browsing. As of the summer 2012, we have planted more than 30,000 trees and shrubs in these drainages. The plantings will provide cover for animals using the draw bottoms as travel corridors between the upland forests and the floodplain forests. Many of the shrubs we have planted, such as hawthorns, choke cherries, and serviceberry, will provide food for bears. Our bear monitoring efforts seek to document how many bears we have now and where they travel.
Click here for a link to a list of mammals we have seen and photos.
Click here for links to our best mammal footage.
We would like to do more small mammal research. Please contact us with ideas for collaboration. (Click here to contact us.)