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Homestead National Monument Of America, Acoustic Monitoring Report, 2017, Emma Brown Feb 2020

Homestead National Monument Of America, Acoustic Monitoring Report, 2017, Emma Brown

United States National Park Service: Publications

Executive Summary

This report presents acoustical data gathered by Student Conservation Association interns and the Natural Resource Specialist at Homestead National Monument of America in 2017. Data were collected at one site to provide park managers with information about the acoustical environment, sources of noise, and the existing ambient sound levels within the monument. This deployment also captured acoustic conditions during the total solar eclipse on 8/21/2017. (Results of the eclipse monitoring effort are provided in Appendix B.)

In this deployment, sound pressure level (SPL) was measured continuously every second by a calibrated sound level meter. Other equipment included an …


Homestead National Monument Of America, Acoustic Monitoring, 2011-2012 Feb 2020

Homestead National Monument Of America, Acoustic Monitoring, 2011-2012

United States National Park Service: Publications

Executive Summary

This report presents acoustical data gathered by Student Conservation Association interns and the Natural Resource Specialist at Homestead National Monument of America in 2011 and 2012. Data were collected at four sites to provide park managers with information on the acoustical environment, sources of noise, and the existing ambient sound levels within the monument. The data will also inform the park managers with information regarding the potential impact of traffic on Highway 4.

Monitoring occurred at each site during two different seasons (except HOME002) in order to document seasonal variations. In each deployment, sound pressure level (SPL) was …


Natural Resources Condition Assessment, Agate Fossil Beds National Monument (February 2020 Revision), Reilly R. Dibner, Nicole Korfanta, Gary Beauvais Feb 2020

Natural Resources Condition Assessment, Agate Fossil Beds National Monument (February 2020 Revision), Reilly R. Dibner, Nicole Korfanta, Gary Beauvais

United States National Park Service: Publications

Executive Summary

In collaboration with the National Park Service, the University of Wyoming Ruckelshaus Institute of Environment and Natural Resources and the Wyoming Natural Diversity Database completed the Natural Resource Condition Assessment (NRCA) for Agate Fossil Beds National Monument (NM). The purpose of the NRCA is to provide park leaders and resource managers with information on resource conditions to support near-term planning and management, long-term strategic planning, and effective science communication to decision-makers and the public.

Agate Fossil Beds NM was authorized in 1965 and established in 1997. The purposes of the park include protecting the paleontological resources on the …


Measuring Spatial And Temporal Shifts In Forest Structure And Composition In T High Elevation Beech Forests In Response To Beech Bark Disease In Great Smoky Mountains National Park, Lee Rubmle, Glenn Taylor, Joshua B. Grinath, Ashley B. Morris Jan 2020

Measuring Spatial And Temporal Shifts In Forest Structure And Composition In T High Elevation Beech Forests In Response To Beech Bark Disease In Great Smoky Mountains National Park, Lee Rubmle, Glenn Taylor, Joshua B. Grinath, Ashley B. Morris

United States National Park Service: Publications

Exotic forest pests and pathogens are among the most serious environmental threats to millions of hectares of forested land worldwide. Beech Bark Disease (BBD) is a non-native, pathogenic complex consisting of associations between scale insects and fungi. First confirmed in Great Smoky Mountains National Park (GRSM) in 1986, this complex has since threatened local high elevation beech forests, which are G-1 ranked (critically imperiled) forest communities where American beech (Fagus grandifolia Ehrh.) is a foundational tree species. In 1994, GRSM initiated the BBD Monitoring Protocol at 10 high elevation beech forest plots in the Park. The plots were sampled biennially …


Prey Of Reintroduced Fishers And Their Habitat Relationships In The Cascades T Range, Washington, Mitchell A. Parsons, Jeffrey C. Lewis, Jonathan N. Pauli, Tara Chestnut, Jason I. Ransom, David O. Werntz, Laura R. Prugh Jan 2020

Prey Of Reintroduced Fishers And Their Habitat Relationships In The Cascades T Range, Washington, Mitchell A. Parsons, Jeffrey C. Lewis, Jonathan N. Pauli, Tara Chestnut, Jason I. Ransom, David O. Werntz, Laura R. Prugh

United States National Park Service: Publications

Conservation and recovery of forest carnivores requires an understanding of their habitat requirements, as well as requirements of their prey. In much of the western United States, trapping and habitat loss led to extirpations of fishers (Pekania pennanti) by the mid-20th century, and reintroductions are ongoing to restore fishers to portions of their former range. Fisher recovery in Washington State has been limited by isolation from other populations, but other potentially important factors, such as diet of fishers in this region and prey availability, have not been thoroughly investigated. We collected hair samples from potential prey and fishers for stable …


Plains Zebra (Equus Quagga) Behaviour In A Restored Population Reveals Seasonal Resource Limitations, Charli De Vos, Alison J. Leslie, Jason I. Ransom Jan 2020

Plains Zebra (Equus Quagga) Behaviour In A Restored Population Reveals Seasonal Resource Limitations, Charli De Vos, Alison J. Leslie, Jason I. Ransom

United States National Park Service: Publications

A once abundant species, plains zebra (Equus quagga), is declining across much of sub-Saharan Africa. Reintroduction efforts at Majete Wildlife Reserve, Malawi, have resulted in rapid population increases, but little is known about how such populations resemble natural populations socially or behaviourally, and what those attributes may reveal about restoration success. Incorporating behavioural knowledge into conservation efforts is an important tool for managing the effects of habitat fragmentation and resource competition. The aim of this study was to quantify the daylight time budget of both family and bachelor bands of reintroduced plains zebra to determine if such behaviours …


Predicting Livestock Depredation Risk By African Lions (Panthera Leo) In A Multi-Use Area Of Northern Tanzania, K. Beattie, E. R. Olson, B. Kissui, A. Kirschbaum, C. Kiffner Jan 2020

Predicting Livestock Depredation Risk By African Lions (Panthera Leo) In A Multi-Use Area Of Northern Tanzania, K. Beattie, E. R. Olson, B. Kissui, A. Kirschbaum, C. Kiffner

United States National Park Service: Publications

Human-wildlife conflicts, especially those involving large carnivores, are of global conservation and livelihood concern and require effective and locally-adapted prevention measures. Risk of lion attack on livestock (i.e. depredation) may vary seasonally and may be associated with variation in wild prey abundance or landscape characteristics. To test these competing hypotheses, we used a resource selection approach, and determined whether prey catchability (indicated by geo-spatial variables), or prey availability (indicated by modeled abundance recorded via camera traps) explained spatial and seasonal variation in livestock depredation risk by African lions on Manyara Ranch Conservancy, a multi-use area in northern Tanzania. Seasonal variation …


Landscapes Of War Permanently Altered Topography Is One Of The Casualties Of War, But Battlefields Can Also Be Of "Collateral Value", Todd R. Lookingbill, Peter D. Smallwood Jan 2020

Landscapes Of War Permanently Altered Topography Is One Of The Casualties Of War, But Battlefields Can Also Be Of "Collateral Value", Todd R. Lookingbill, Peter D. Smallwood

Geography and the Environment Faculty Publications

But the rationale for creating battlefield parks has changed over the past 100 years, as have attitudes about battlefield conservation with a related emphasis on the physical landscapes themselves, leading to their management for multiple, layered assets through principles of constructive conservation. Existing battlefield parks provide perhaps the longest-standing examples of the evolution of landscapes of war toward generators of multiple ecosystem benefits. Moving from battlefield parks that, in some cases, have not seen warfare for hundreds of years, we examined landscapes of more recent conflict and considered the future collateral values that could be attained by establishing parks at …


Transitioning From Emergency Remote Learning To Deep Online Learning Experiences In Geography Education, Richard B. Schultz, Michael N. Demers Jan 2020

Transitioning From Emergency Remote Learning To Deep Online Learning Experiences In Geography Education, Richard B. Schultz, Michael N. Demers

Publications & Research

Recent events resulting from the Covid-19 pandemic precipitated a triage-like environment wherein experienced faculty were forced to convert courses rapidly to online venues. This unexpected circumstance forced educators to adopt different learning theories of which they were largely unaware. The results were predominantly unsatisfactory for both learner and educator. This paper provides perspectives to this unfortunate circumstance, describes positive and negative aspects of the experiences, presents best practices for deep online learning, and challenges geography educators to learn how instructional design for online courses can be leveraged. The goal is to provide a forum for online learning in geography education.


Using Unmanned Aerial Systems (Drones) With A Thermal Sensor To Map And Count Deer Population, Maxwell C. Ott Jan 2020

Using Unmanned Aerial Systems (Drones) With A Thermal Sensor To Map And Count Deer Population, Maxwell C. Ott

Williams Honors College, Honors Research Projects

The number of deer in an area is an important statistic for land managers to know, as overabundance has many negative effects. There are many methods that have been used to count deer in the past, such as using manned helicopters and airplanes, walking on foot, and conducting controlled hunts. UAS (unmanned aerial systems) is a growing field that provides many benefits over traditional methods of counting deer, such as lower cost and missions being less time consuming. Using a thermal sensor attached to a UAS makes it simple to spot any deer during a flight. Two main methods of …


Tropical Cyclone Vulnerability Of Atlantic Coastal Counties In The United States, Zachary Alexander Jan 2020

Tropical Cyclone Vulnerability Of Atlantic Coastal Counties In The United States, Zachary Alexander

Williams Honors College, Honors Research Projects

  1. Abstract

    Coastal populations along the Atlantic Coast of the United States face a persistent threat of tropical cyclones. Tropical cyclones of any strength can cause significant damages and losses to both life and property. As coastal populations continue to rise in a changing climate, the power of knowing which communities are the most and least vulnerable to future tropical cyclone events can assist in mitigating some of the losses. This paper explores the factors that make a coastal community more or less vulnerable to tropical cyclones based on prior natural hazards research and creates a relative index that will tell …


Direct And Indirect Effects Of Temperature And Prey Abundance On Bald Eagle Reproductive Dynamics, Joshua H. Schmidt, Judy Putera, Tammy L. Wilson Dec 2019

Direct And Indirect Effects Of Temperature And Prey Abundance On Bald Eagle Reproductive Dynamics, Joshua H. Schmidt, Judy Putera, Tammy L. Wilson

United States National Park Service: Publications

Understanding the mechanisms by which populations are regulated is critical for predicting the effects of large-scale perturbations. While discrete mortality events provide clear evidence of direct impacts, indirect pathways are more difficult to assess but may play important roles in population and ecosystem dynamics. Here, we use multi-state occupancy models to analyze a long-term dataset on nesting bald eagles in south-central Alaska with the goal of identifying both direct and indirect mechanisms influencing reproductive output in this apex predator. We found that the probabilities of both nest occupancy and success were higher in the portion of the study area where …


Plant Community Composition And Structure Monitoring At Wind Cave National Park, 2019 Data Report, Theresa L. Schaffner, Daniel J. Swanson, Stephanie L. Rockwood Dec 2019

Plant Community Composition And Structure Monitoring At Wind Cave National Park, 2019 Data Report, Theresa L. Schaffner, Daniel J. Swanson, Stephanie L. Rockwood

United States National Park Service: Publications

Abstract

This report presents the results of the Northern Great Plains Inventory and Monitoring Network (NGPN) and Northern Great Plains Fire Ecology Program (NGPFire) vegetation monitoring at Wind Cave National Park (WICA) in 2019. This was the ninth year of combined monitoring efforts.

Crew members from NGPN visited 18 long-term monitoring plots to collect data representing the plant communities at WICA. The NGPFire program collected pre- and post-burn data from an additional 37 plant community and forest structure monitoring plots. This work is part of a long-term monitoring effort designed to evaluate the condition of the vegetation community and understand …


Vegetation Classification And Mapping, Missouri National Recreational River, Tom Baldvins, Matt Ley, David Jones, Joe Stevens, Hannah Pilkington Dec 2019

Vegetation Classification And Mapping, Missouri National Recreational River, Tom Baldvins, Matt Ley, David Jones, Joe Stevens, Hannah Pilkington

United States National Park Service: Publications

Executive Summary

The vegetation inventory project at Missouri National Recreational River (MNRR) classified and mapped vegetation within the park administrative boundary and estimated thematic map accuracy quantitatively. The project was conducted over a four year period from the summer of 2015 to the winter of 2019.

The project follows guidance provided by the National Park Service (NPS) Vegetation Mapping Inventory (VMI) Program. The overall process includes initial planning and scoping, imagery procurement, field data collection, data analysis, imagery interpretation and classification, and accuracy assessment. The initial planning and scoping meetings to support study plan development took place in December, 2009, …


Natural Resource Condition Assessment, Homestead National Monument Of America, David S. Jones, Roy Cook, John Sovell, Christopher Herron, Jay Benner, Karin Decker, Andrew Beavers, Johannes Beebee, David Weinzimmer Dec 2019

Natural Resource Condition Assessment, Homestead National Monument Of America, David S. Jones, Roy Cook, John Sovell, Christopher Herron, Jay Benner, Karin Decker, Andrew Beavers, Johannes Beebee, David Weinzimmer

United States National Park Service: Publications

Executive Summary

The National Park Service (NPS) Natural Resource Condition Assessment (NRCA) Program administered by the NPS Water Resources Division evaluates current conditions for important natural resources and resource indicators using primarily existing information and data. NRCAs also report on trends in resource condition when possible, identify critical data gaps, and characterize a general level of confidence for study findings. This NRCA complements historic resource assessments, is multi-disciplinary in scope, employs a hierarchical indicator framework, identifies and develops reference conditions/values for comparison against current conditions, and emphasizes spatial evaluation of conditions and GIS (map) products.

Congress established the Homestead National …


Plant Community Composition And Structure Monitoring At Agate Fossil Beds National Monument, 2019 Data Report, Molly B. Davis Dec 2019

Plant Community Composition And Structure Monitoring At Agate Fossil Beds National Monument, 2019 Data Report, Molly B. Davis

United States National Park Service: Publications

Abstract

This report presents the results of vegetation monitoring efforts in 2019 at Agate Fossil Beds National Monument (AGFO) by the Northern Great Plains Inventory and Monitoring Network (NGPN) and the Northern Great Plains Fire Ecology Program (NGPFire). This was the ninth year of combined monitoring efforts.

In 2019, crew members from NGPN visited 6 long-term plant community monitoring (PCM) plots to collect data on the upland mixed-grass prairie plant communities at AGFO. This work is part of a long-term monitoring program established to better understand the condition of the vegetation community and how it changes over time. NGPN staff …


The Effects Of Urban Development And The Incidence Of Flooding And Discharge Changes From 1956-2016: A Case Study From Juan Diaz Township, Republic Of Panama, Virgilio De Jesus Quintero Rodriguez Dec 2019

The Effects Of Urban Development And The Incidence Of Flooding And Discharge Changes From 1956-2016: A Case Study From Juan Diaz Township, Republic Of Panama, Virgilio De Jesus Quintero Rodriguez

Graduate Theses and Dissertations

The increase in flood occurrences in the Township of Juan Diaz has affected thousands of families and hundreds of businesses and has negatively impacted the lives of thousands of residents, who expect the worse every time there is a prolonged period of rain. Some of the residents lose their appliances, cars, furniture and houses every year. This study examines the relationship between urban development and flooding. Also, it addresses the influences of topography, green cover, population changes, runoff changes, and social dynamics on this relationship. This study implemented the use of thematic cartography, geographic information systems (GIS), personal interviews and …


Material And Seismic Assessment Of The Great House At Casa Grande Ruins National Monument, Arizona, Douglas W. Porter, Anjali Mehrotra, Matthew J. Dejong, Angelyn Bass, Matthew Guebard, John Ochsendorf Nov 2019

Material And Seismic Assessment Of The Great House At Casa Grande Ruins National Monument, Arizona, Douglas W. Porter, Anjali Mehrotra, Matthew J. Dejong, Angelyn Bass, Matthew Guebard, John Ochsendorf

United States National Park Service: Publications

The authors characterized earthen wall materials and plasters in a mid-fourteenth-century Hohokam great house at Casa Grande Ruins National Monument (Arizona) and assessed the seismic susceptibility of its puddled earth walls. Characterization included determining the microstructure, microcomposition, porosity, aggregate mineralogy, and identification of phases in the binding matrix for each of 36 samples and reconstructing plaster technologies, including material selection, preparation, and application sequences. Findings support the ideas that earthen materials were manipulated to optimize their performance to suit the unique site conditions and needs of the ancient people using the structure and included finishes that were unusual in southwestern …


Exposure And Potential Effects Of Pesticides And Pharmaceuticals In Protected Streams Of The Us National Park Service Southeast Region, Paul M. Bradley, Kristin M. Romanok, Jeffrey R. Duncan, William A. Battaglin, Jimmy M. Clark, Michelle L. Hladik, Bradley J. Huffman, Luke R. Iwanowicz, Celeste A. Journey, Kelly L. Smalling Nov 2019

Exposure And Potential Effects Of Pesticides And Pharmaceuticals In Protected Streams Of The Us National Park Service Southeast Region, Paul M. Bradley, Kristin M. Romanok, Jeffrey R. Duncan, William A. Battaglin, Jimmy M. Clark, Michelle L. Hladik, Bradley J. Huffman, Luke R. Iwanowicz, Celeste A. Journey, Kelly L. Smalling

United States National Park Service: Publications

Globally, protected areas offer refugia for a broad range of taxa including threatened and endangered species. In the United States (US), the National Park Service (NPS) manages public lands to preserve biodiversity, but increasing park visitation and development of surrounding landscapes increase exposure to and effects from bioactive contaminants. The risk (exposure and hazard) to NPS protected-stream ecosystems within the highly urbanized southeast region (SER) from bioactive contaminants was assessed in five systems based on 334 pesticide and pharmaceutical analytes in water and 119 pesticides in sediment. Contaminant mixtures were common across all sampled systems, with approximately 24% of the …


Satellite-Based Decadal Change Assessments Of Pan-Arctic Environments, Liza K. Jenkins, Tom Barry, Karl R. Bosse, William S. Currie, Tom Christensen, Sara Longan, Robert A. Shuchman, Danielle Tanzer, Jason J. Taylor Nov 2019

Satellite-Based Decadal Change Assessments Of Pan-Arctic Environments, Liza K. Jenkins, Tom Barry, Karl R. Bosse, William S. Currie, Tom Christensen, Sara Longan, Robert A. Shuchman, Danielle Tanzer, Jason J. Taylor

United States National Park Service: Publications

Remote sensing can advance the work of the Circumpolar Biodiversity Monitoring Program through monitoring of satellite-derived terrestrial and marine physical and ecological variables. Standardized data facilitate an unbiased comparison across variables and environments. Using MODIS standard products of land surface temperature, percent snow-covered area, NDVI, EVI, phenology, burned area, marine chlorophyll, CDOM, sea surface temperature, and marine primary productivity, significant trends were observed in almost all variables between 2000 and 2017. Analysis of seasonal data revealed significant breakpoints in temporal trends. Within the terrestrial environment, data showed significant increasing trends in land surface temperature and NDVI. In the marine environment, …


Vegetation Classification And Mapping, Niobrara National Scenic River, Tom Baldvins, Matt Ley, Joe Stevens, David Jones, Hannah Pilkington Nov 2019

Vegetation Classification And Mapping, Niobrara National Scenic River, Tom Baldvins, Matt Ley, Joe Stevens, David Jones, Hannah Pilkington

United States National Park Service: Publications

Executive Summary

The vegetation inventory project at Niobrara National Scenic River (NIOB) classified and mapped vegetation within the park administrative boundary and estimated thematic map accuracy quantitatively. The project was conducted over a four year period from the summer of 2015 to the winter of 2019. Located in north-central Nebraska, approximately 76 miles of the park is designated as a wild and scenic river. The vast majority of land within the NIOB administrative boundary is private or state-owned.

The project follows guidance provided by the National Park Service (NPS) Vegetation Mapping Inventory (VMI) Program. The overall process includes initial planning …


Natural Resource Condition Assessment, Tallgrass Prairie National Preserve, David S. Jones, Roy Cook, John Sovell, Christopher Herron, Jay Benner, Karin Decker, Andrew Beavers, Johannes Beebee, David Weinzimmer, Rob Schorr Nov 2019

Natural Resource Condition Assessment, Tallgrass Prairie National Preserve, David S. Jones, Roy Cook, John Sovell, Christopher Herron, Jay Benner, Karin Decker, Andrew Beavers, Johannes Beebee, David Weinzimmer, Rob Schorr

United States National Park Service: Publications

Executive Summary

The National Park Service (NPS) Natural Resource Condition Assessment (NRCA) Program administered by the NPS Water Resources Division evaluates current conditions for important natural resources and resource indicators using primarily existing information and data. NRCAs also report on trends in resource condition when possible, identify critical data gaps, and characterize a general level of confidence for study findings. This NRCA complements historic resource assessments, is multi-disciplinary in scope, employs a hierarchical indicator framework, identifies and develops reference conditions/values for comparison against current conditions, and emphasizes spatial evaluation of conditions and GIS products.

Created in 1996, Tallgrass Prairie National …


Relationships Between Soil Macroinvertebrates And Nonnative Feral Pigs (Sus Scrofa) In Hawaiian Tropical Montane Wet Forests, Nathaniel H. Wehr, Creighton M. Litton, Noa K. Lincoln, Steven C. Hess Oct 2019

Relationships Between Soil Macroinvertebrates And Nonnative Feral Pigs (Sus Scrofa) In Hawaiian Tropical Montane Wet Forests, Nathaniel H. Wehr, Creighton M. Litton, Noa K. Lincoln, Steven C. Hess

United States National Park Service: Publications

Abstract Nonnative feral pigs (Sus scrofa) are recognized throughout the New World as a highly significant introduced species in terms of ecosystem alteration. Similarly, nonnative soil macroinvertebrates (e.g. earthworms, ground beetles) invade and alter the structure and function of native habitats globally. However, the relationship between feral pigs and soil macroinvertebrates remains largely unknown. This study analyzed relationships between these taxa using nine sites located inside and outside of feral pig management units representing a * 25 year chronosequence of removal in tropical montane wet forests in Hawai‘i. Soil macroinvertebrates were sampled from plots categorized as: actively trampled by feral …


Community Forest In Liberia: The Interface Between Sustainable Charcoal Production And Deforestation, Amavie Clement Oct 2019

Community Forest In Liberia: The Interface Between Sustainable Charcoal Production And Deforestation, Amavie Clement

Capstone Collection

The available data establishes a direct correlation between charcoal production and forest degradation and deforestation in Liberia. Charcoal is the primary energy source for Liberians, especially in urban areas where the bulk of the population lives. It is expected to be the mainstay energy source for years to come because it is affordable, accessible, and convenient to use compared to other forms of energy (i.e. electricity and petroleum gas). However, the current model of charcoal production, based on indiscriminate felling of trees, poses a danger to the environment as it results in widespread forest degradation and deforestation. Therefore, any successful …


Juvenile Hawksbill Residency And Habitat Use Within A Caribbean Marine Protected Area, Thomas H. Selby, Kristen M. Hart, Brian J. Smith, Clayton G. Pollock, Zandy Hillis-Starr, Madan K. Oli Oct 2019

Juvenile Hawksbill Residency And Habitat Use Within A Caribbean Marine Protected Area, Thomas H. Selby, Kristen M. Hart, Brian J. Smith, Clayton G. Pollock, Zandy Hillis-Starr, Madan K. Oli

United States National Park Service: Publications

Understanding the spatial ecology of highly mobile marine vertebrates is necessary for informing conservation and management strategies aimed at protecting such species. Buck Island Reef National Monument (BIRNM), off the coast of St. Croix, US Virgin Islands, harbors critical foraging habitat for Critically Endangered juvenile hawksbills Eretmochelys imbricata that exhibit high site fidelity until sexual maturation. Using an array of fixed passive acoustic receivers that covered over 20.2 km2 at its largest configuration and in-water biannual sampling, we analyzed residency patterns and habitat use of 29 hawksbills. High recapture rates allowed for long- term data collection for some individuals, with …


Coffee Is Not Forever : A Global History Of The Coffee Leaf Rust, Stuart Mccook Oct 2019

Coffee Is Not Forever : A Global History Of The Coffee Leaf Rust, Stuart Mccook

Ohio University Press Open Access Books

The global coffee industry, which fuels the livelihoods of farmers, entrepreneurs, and consumers around the world, rests on fragile ecological foundations. In Coffee Is Not Forever, Stuart McCook explores the transnational story of this essential crop through a history of one of its most devastating diseases, the coffee leaf rust. He deftly synthesizes agricultural, social, and economic histories with plant genetics and plant pathology to investigate the increasing interdependence of the world’s coffee-producing zones. In the process, he illuminates the progress and prognosis of the challenges—especially climate change—that pose an existential threat to a crop that global consumers often take …


Nonlinear Reaction–Diffusion Process Models Improve Inference For Population Dynamics, Xinyi Lu, Perry J. Williams, Mevin B. Hooten, James A. Powell, Jamie N. Womble, Michael R. Bower Sep 2019

Nonlinear Reaction–Diffusion Process Models Improve Inference For Population Dynamics, Xinyi Lu, Perry J. Williams, Mevin B. Hooten, James A. Powell, Jamie N. Womble, Michael R. Bower

United States National Park Service: Publications

Partial differential equations (PDEs) are a useful tool for modeling spatiotemporal dynamics of ecological processes. However, as an ecological process evolves, we need statistical models that can adapt to changing dynamics as new data are collected. We developed a model that combines an ecological diffusion equation and logistic growth to characterize colonization processes of a population that establishes long-term equilibrium over a heterogeneous environment. We also developed a homogenization strategy to statistically upscale the PDE for faster computation and adopted a hierarchical framework to accommodate multiple data sources collected at different spatial scales. We highlighted the advantages of using a …


Permafrost Hydrology Drives The Assimilation Of Old Carbon By Stream Food Webs In The Arctic, Jonathan A. O’Donnell, Michael P. Carey, Joshua C. Koch, Xiaomei Xu, Brett A. Poulin, Jennifer Walker, Christian E. Zimmerman Sep 2019

Permafrost Hydrology Drives The Assimilation Of Old Carbon By Stream Food Webs In The Arctic, Jonathan A. O’Donnell, Michael P. Carey, Joshua C. Koch, Xiaomei Xu, Brett A. Poulin, Jennifer Walker, Christian E. Zimmerman

United States National Park Service: Publications

Permafrost thaw in the Arctic is mobilizing old carbon (C) from soils to aquatic ecosystems and the atmosphere. Little is known, however, about the assimilation of old C by aquatic food webs in Arctic watersheds. Here, we used C isotopes (d13C, D14C) to quantify C assimilation by biota across 12 streams in arctic Alaska. Streams spanned watersheds with varying permafrost hydrology, from ice-poor bedrock to ice-rich loess (that is, yedoma). We measured isotopic content of (1) C sources including dissolved organic C (DOC), dissolved inorganic C (DIC), and soil C, and (2) stream biota, including benthic biofilm and macroinvertebrates, and …


Social Interactions Do Not Drive Territory Aggregation In A Grassland Songbird, S.K. Winnicki, S.M. Munguia, E.J. Williams, W.A. Boyle Aug 2019

Social Interactions Do Not Drive Territory Aggregation In A Grassland Songbird, S.K. Winnicki, S.M. Munguia, E.J. Williams, W.A. Boyle

United States National Park Service: Publications

Understanding the drivers of animal distributions is a fundamental goal of ecology and informs habitat management. The costs and benefits of colonial aggregations in animals are well established, but the factors leading to aggregation in territorial animals remain unclear. Territorial animals might aggregate to facilitate social behavior such as (1) group defense from predators and/or parasites, (2) cooperative care of offspring, (3) extra-pair mating, and/or (4) mitigating costs of extra-pair mating through kin selection. Using experimental and observational methods, we tested predictions of all four hypotheses in a tallgrass prairie in northeast Kansas, United States. Grasshopper Sparrow (Ammodramus savannarum) males …


Vegetation Monitoring At Homestead National Monument Of America, Nebraska, 1998–2017, Sherry A. Leis Aug 2019

Vegetation Monitoring At Homestead National Monument Of America, Nebraska, 1998–2017, Sherry A. Leis

United States National Park Service: Publications

Executive Summary

The Heartland Inventory and Monitoring Network has sampled permanent monitoring sites in three vegetation community types (restored prairie, successional forest, and bur oak forest) at Homestead National Monument of America since 1998 (includes nine sample years). Network scientists record each species, aerial cover estimates of ground flora, diameter at breast height of midstory and overstory trees, and tree regeneration frequency (tree seedlings and saplings) within these permanent sites.

The park has experienced similar periods of drought and wetness through the monitoring record. Ground cover estimates indicate that prairie litter and bare ground are negatively related; prescribed fire cycles …