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2019

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Articles 1 - 30 of 83

Full-Text Articles in Public Administration

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 …


Democratic Innovations In North America, Christopher F. Karpowitz, Chad Raphael Dec 2019

Democratic Innovations In North America, Christopher F. Karpowitz, Chad Raphael

Communication

This chapter assesses the state of democratic innovations in North America, including the United States, Canada, and English-speaking countries of the Caribbean. We begin by setting these innovations in the contexts of democracy on the continent, which includes both established democracies and countries that have only recently decolonised. We go on to discuss major trends in democratic innovations over the past two decades in North America, including referendums and initiatives, mini-publics and collaborative governance, and digital participation in political and civic life. We note the broad range of issues addressed by these innovations and their effects on democratic institutions at …


Municipal E-News: Issue 94: Quarter 4, December 2019, Mtas Dec 2019

Municipal E-News: Issue 94: Quarter 4, December 2019, Mtas

Municipal E-News

The "Municipal E-News" was created by MTAS in 2009 as part of our continuing efforts to meet our mission of providing timely, valuable information and assistance to Tennessee cities.


Live Peabody: An Age-Friendly Action Plan, Caitlin Coyle, Beth Rouleau Dec 2019

Live Peabody: An Age-Friendly Action Plan, Caitlin Coyle, Beth Rouleau

Center for Social and Demographic Research on Aging Publications

The vision of the Live Peabody Initiative is to inspire change in the City of Peabody so that residents of all ages and abilities can thrive. The success of this initiative is dependent on the involvement of a dedicated and passionate group of residents and stakeholders that will proactively spearhead this age-friendly effort. These individuals will actively collaborate with civic, business and non-profit organizations as well as state and local government officials to heighten awareness of the age-friendly movement and implementation of the action items outlines in this report—all to spur positive change for the City of Peabody. This report …


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 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 …


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 …


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, …


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 …


Miller, Harold Asher, B. 1939 (Mss 679), Manuscripts & Folklife Archives Nov 2019

Miller, Harold Asher, B. 1939 (Mss 679), Manuscripts & Folklife Archives

MSS Finding Aids

Finding aid only for Manuscripts Collection 679. Correspondence, speeches, political material and notes related to Harold Asher Miller’s political career, which included several terms on the Bowling Green City Commission and one term as the city’s Mayor in the 1980s. It also includes material related to several Miller campaigns for the Warren County Judge Executive position.


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 …


Organizational Determinants Of Political Involvement In Trade And Professional Membership Associations, Marina Saitgalina, Lisa A. Dicke, Patricia Birungi Nov 2019

Organizational Determinants Of Political Involvement In Trade And Professional Membership Associations, Marina Saitgalina, Lisa A. Dicke, Patricia Birungi

School of Public Service Faculty Publications

Trade and business associations and professional membership societies like many other political interest groups in the United States advocate and lobby their interests in the policy arena. Yet, we lack the understanding of how organizational capabilities shape different forms of political engagement in trade and professional associations. Research on the political involvement of tax-exempt organizations has been focused on charitable nonprofits. Studying the elements that underlie political action strategies and tactics of trade and professional associations would expand our understanding of political engagement in the nonprofit sector. In our sample of occupational mutual benefit associations, both resource dependence and institutional …


Lexington For All Ages: A Community Needs Assessment, Sue Berger, Jan Mutchler, Nidya Velasco Roldán, Ceara Somerville, Rebecca Mailman, Caitlin Coyle Nov 2019

Lexington For All Ages: A Community Needs Assessment, Sue Berger, Jan Mutchler, Nidya Velasco Roldán, Ceara Somerville, Rebecca Mailman, Caitlin Coyle

Center for Social and Demographic Research on Aging Publications

The Lexington for All Ages initiative is meant to ensure that Lexington is and remains a place where older adults can comfortably and safely age in place. This report describes research undertaken by the Center for Social & Demographic Research on Aging within the Gerontology Institute at the University of Massachusetts Boston, on behalf of the Lexington Department of Human Services, to investigate the needs, interests, preferences, and opinions of Lexington’s residents age 50 and older. Structured around livability principles embedded in the World Health Organization’s Age-Friendly Community framework, the Lexington for All Ages initiative considers physical infrastructure as well …


Bowling Green, Kentucky - Waterworks (Sc 3488), Manuscripts & Folklife Archives Oct 2019

Bowling Green, Kentucky - Waterworks (Sc 3488), Manuscripts & Folklife Archives

MSS Finding Aids

Finding aid and full-text scan of documents (Click on "Additional Files" below for Manuscripts Small Collection 3488. “Changes in Plans and Specifications for Water Works Improvements, Contracts Nos. 1 to 5, Incl[usive] for the City of Bowling Green, Bowling Green, Kentucky, December 12, 1947.”


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 …


Democracy And Bureaucracy Of Smart Place: Coral Gables, Fl And The Role Of Aspirational Content In Local Governance, Ramon Trias Oct 2019

Democracy And Bureaucracy Of Smart Place: Coral Gables, Fl And The Role Of Aspirational Content In Local Governance, Ramon Trias

FIU Electronic Theses and Dissertations

This dissertation explores the role aspirational content on democracy and bureaucracy for governance of place in the United States. Place is a fundamental concept for municipal democracy and bureaucracy, as it defines the physical qualities of a community and their effect on people and quality of life. Smart Place would update theory and practices for local governance. Research reviewed process and content for the implementation of place, a gap in public administration theory. Literature review, historical research on 20th century planning and zoning, research on 1920’s best practices on architecture and archival, qualitative findings and quantitative data on Coral …


Snap At The Community Scale: How Neighborhood Characteristics Affect Participation And Food Access, Nevin Cohen Oct 2019

Snap At The Community Scale: How Neighborhood Characteristics Affect Participation And Food Access, Nevin Cohen

Publications and Research

Cities are spatially diverse, with enclaves of particular demo- graphic groups, clusters of businesses, and pockets of low-income individuals living amid affluence.

This essay presents data from New York City to illustrate the importance of measuring and addressing neighborhood characteristics that affect Sup- plemental Nutrition Assistance Program (SNAP) participation and the purchasing power of SNAP benefits: pockets of “eligible-but-not-enrolled” in- dividuals, proximity between SNAP participants and jobs, and variations in food prices across neighborhoods.

It concludes with 5 exam- ples of how addressing these community-scale issues can increase SNAP participation and food access.


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 …


The Ira, Social Media And Political Polarization In The United States, 2012-2018, Philip N. Howard, Bharath Ganesh, Dimitra Liotsiou, John Kelly, Camille François Oct 2019

The Ira, Social Media And Political Polarization In The United States, 2012-2018, Philip N. Howard, Bharath Ganesh, Dimitra Liotsiou, John Kelly, Camille François

United States Senate Documents

Russia’s Internet Research Agency (IRA) launched an extended attack on the United States by using computational propaganda to misinform and polarize US voters. This report provides the first major analysis of this attack based on data provided by social media firms to the Senate Select Committee on Intelligence (SSCI).

This analysis answers several key questions about the activities of the known IRA accounts. In this analysis, we investigate how the IRA exploited the tools and platforms of Facebook, Instagram, Twitter, and YouTube to impact US users. We identify which aspects of the IRA’s campaign strategy got the most traction on …


The Tactics & Tropes Of The Internet Research Agency, Renee Diresta, Kris Shaffer, Becky Ruppel, David Sullivan, Robert Matney, Ryan Fox, Jonathan Albright, Ben Johnson Oct 2019

The Tactics & Tropes Of The Internet Research Agency, Renee Diresta, Kris Shaffer, Becky Ruppel, David Sullivan, Robert Matney, Ryan Fox, Jonathan Albright, Ben Johnson

United States Senate Documents

Upon request by the United States Senate Select Committee on Intelligence (SSCI), New Knowledge reviewed an expansive data set of social media posts and metadata provided to SSCI by Facebook, Twitter, and Alphabet, plus a set of related data from additional platforms. The data sets were provided by the three primary platforms to serve as evidence for an investigation into the Internet Research Agency (IRA) influence operations. The organic post content in this data set has never previously been seen by the public. Our report quantifies and contextualizes Internet Research Agency (IRA) influence operations targeting American citizens from 2014 through …


Report Of The Select Committee On Intelligence United States Senate On Russian Active Measures Campaigns And Interference In The 2016 U.S. Election: Volume 2: Russia's Use Of Social Media, With Additional Views, Select Committee On Intelligence United States Senate Oct 2019

Report Of The Select Committee On Intelligence United States Senate On Russian Active Measures Campaigns And Interference In The 2016 U.S. Election: Volume 2: Russia's Use Of Social Media, With Additional Views, Select Committee On Intelligence United States Senate

United States Senate Documents

In 2016, Russian operatives associated with the St. Petersburg-based Internet Research Agency (IRA) used social media to conduct an information warfare campaign designed to spread disinformation and societal division in the United States. Masquerading as Americans, these operatives used targeted advertisements, intentionally falsified news articles, self-generated content, and social media platform tools to interact with and attempt to deceive tens of millions of social media users in the United States. This campaign sought to polarize Americans on the basis of societal, ideological, and racial differences, provoked real world events, and was part of a foreign government's covert support of Russia's …


Report Of The Select Committee On Intelligence United States Senate On Russian Active Measures Campaigns And Interference In The 2016 U.S. Election: Volume 1: Russian Efforts Against Election Infrastructure, With Additional Views, Select Committee On Intelligence United States Senate Oct 2019

Report Of The Select Committee On Intelligence United States Senate On Russian Active Measures Campaigns And Interference In The 2016 U.S. Election: Volume 1: Russian Efforts Against Election Infrastructure, With Additional Views, Select Committee On Intelligence United States Senate

United States Senate Documents

From 2017 to 2019, the Committee held hearings, conducted interviews, and reviewed intelligence related to Russian attempts in 2016 to access election infrastructure. The Committee sought to determine the extent of Russian activities, identify the response of the U.S. Government at the state, local, and federal level to the threat, and make recommendations on how to better prepare for such threats in the future. 1 he Committee received testimony from state election officials, Obama administration officials, and those in the Intelligence Community and elsewhere in the U.S. Government responsible for evaluating threats to elections.

he Russian govemment directed extensive activity, …


Swampscott For All Ages: A Community Needs Assessment, Caitlin Coyle, Jan Mutchler, Nidya Velasco, Sue Berger, Rebecca Mailman Oct 2019

Swampscott For All Ages: A Community Needs Assessment, Caitlin Coyle, Jan Mutchler, Nidya Velasco, Sue Berger, Rebecca Mailman

Center for Social and Demographic Research on Aging Publications

By the year 2030, 35% of Swampscott residents will be age 60 and older. In response to this demographic shift as well as in response to the desire of most residents to remain living in their community, the resident leaders of Swampscott, with support of the Town, have embarked on the journey to become a more age friendly community. They call themselves the Swampscott for All Ages Committee. The Swampscott for All Ages initiative is meant to ensure that Swampscott is and remains a place where older adults can comfortably and safely age in place. It is a resident-led committee …


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 …


Municipal E-News: Issue 93: Quarter 3, September 2019, Mtas Sep 2019

Municipal E-News: Issue 93: Quarter 3, September 2019, Mtas

Municipal E-News

The "Municipal E-News" was created by MTAS in 2009 as part of our continuing efforts to meet our mission of providing timely, valuable information and assistance to Tennessee cities.


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 …