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Articles 31 - 60 of 170
Full-Text Articles in Physical Sciences and Mathematics
Lake Mead National Recreation Area Monitoring And Evaluation Of Sensitive Wildlife: Quartlerly Progress Report, Period Ending September 30, 2010, Margaret N. Rees
Lake Mead National Recreation Area Monitoring And Evaluation Of Sensitive Wildlife: Quartlerly Progress Report, Period Ending September 30, 2010, Margaret N. Rees
Wildlife Monitoring
Project 1. Relict Leopard Frog Monitoring, Management, and Research
- All milestones and deliverables are on schedule
- Reconnaissance conducted at sites in the Gold Butte during coordinated efforts with USGS
- Annual Project Review Presentation provided to Clark County
- Spring-season mark-recapture at Blue Point Spring completed this quarter
- Fall-season mark-recapture effort initiated
Project 2. Bald Eagle Winter Monitoring and Evaluation
- This project has been completed and all associated deliverables have been met
Project 3. Peregrine Falcon Monitoring and Evaluation
- This project has been completed and all final report deliverables have been met
- Presentations were given at the Raptor Research Foundation Annual Conference …
Limnological Assistance For Lake Mead National Recreation Area: Quarterly Report, Period Ending September 30, 2010, Margaret N. Rees
Limnological Assistance For Lake Mead National Recreation Area: Quarterly Report, Period Ending September 30, 2010, Margaret N. Rees
Limnological Studies
Project 1
- Technical assistance with the implementation of the Interagency Monitoring Action Plan (I-MAP) for Quagga Mussels is ongoing. During this quarter, analysis was completed for 11 adult/juvenile samples from the winter 2009 – spring 2010 sampling. Two manuscripts related to the I-MAP were submitted to the peer-reviewed journal, Aquatic Invasions.
Project 2
- Topics and analyses have been approved for annual report development as prescribed by the Limnological and Aquatic Resource Monitoring and Research Plan for Lakes Mead and Mohave.
- Content, including links and photos for the front page, four limnology category web pages, and one associated page have been …
Floristic Investigation Of Crooked Creek Community Of Juan Solomon Park, Indianapolis Indiana, Raelene M. Crandall, Rebecca W. Dolan
Floristic Investigation Of Crooked Creek Community Of Juan Solomon Park, Indianapolis Indiana, Raelene M. Crandall, Rebecca W. Dolan
Rebecca W. Dolan
The protection of plant resources in urban areas is a growing conservation concern. Inventory activities that document species presence and stewardship plans that protect and enhance these areas are needed. The results of a botanical inventory of the Crooked Creek Community Juan Solomon Park in Indianapolis, Indiana, are reported in this paper. The 46-acre park contains three distinct habitats, supporting a wide variety of plants. One hundred seventy-nine vascular plant species from 64 families were identified, including 53 (29.6%) non-native species that are naturalizing within the park. Despite its high percentage of alien species and urban setting, the park is …
Genetic Analysis Of The Federally Endangered Winged Mapleleaf Mussel To Aid Proposed Re-Introduction Efforts, Kevin J. Roe
Genetic Analysis Of The Federally Endangered Winged Mapleleaf Mussel To Aid Proposed Re-Introduction Efforts, Kevin J. Roe
Kevin J. Roe
The winged mapleleaf, Quadrula fragosa, historically occurred in the Mississippi, Tennessee, Ohio, and Cumberland river drainages, but has suffered severe population and range reductions. At the time that the species was federally listed as endangered, its range was thought to have been reduced to a stretch of the St. Croix River between northwestern Wisconsin and east-central Minnesota. Recently, morphologically “Q. fragosa-like” specimens were discovered at sites in Arkansas (Ouachita River and Saline River), Missouri (Bourbeuse River), and Oklahoma (Little River). Subsequently, a plan was proposed to re-introduce Q. fragosa into portions of its historic range where its been extirpated from …
Spatial And Temporal Patterns Of Ch4 And N2o Fluxes In Terrestrial Ecosystems Of North America During 1979–2008: Application Of A Global Biogeochemistry Model, Hanqin Tian, X. Xu, M. Liu, Wei Ren, C. Zhang, G. Chen, Chaoqun (Crystal) Lu
Spatial And Temporal Patterns Of Ch4 And N2o Fluxes In Terrestrial Ecosystems Of North America During 1979–2008: Application Of A Global Biogeochemistry Model, Hanqin Tian, X. Xu, M. Liu, Wei Ren, C. Zhang, G. Chen, Chaoqun (Crystal) Lu
Chaoqun (Crystal) Lu
Continental-scale estimations of terrestrial methane (CH4) and nitrous oxide (N2O) fluxes over a long time period are crucial to accurately assess the global balance of greenhouse gases and enhance our understanding and prediction of global climate change and terrestrial ecosystem feedbacks. Using a process-based global biogeochemical model, the Dynamic Land Ecosystem Model (DLEM), we quantified simultaneously CH4 and N2O fluxes in North America's terrestrial ecosystems from 1979 to 2008. During the past 30 years, approximately 14.69 ± 1.64 T g C a−1 (1 T g = 1012 g) of CH4, and 1.94 ± 0.1 T g N a−1 of N2O …
Background Fluorescence In Groundwater From A Tropical Karst Island Aquifer, Michelle Hoffman
Background Fluorescence In Groundwater From A Tropical Karst Island Aquifer, Michelle Hoffman
Michelle Hoffman
Background levels of four fluorescent compounds were monitored biweekly at thirteen sampling sites on Guam, consisting of subtidal and intertidal springs, dissolution fractures, and internal upland contact spring discharge, over a 13-month period from 2006 to 2007. Samples were compared to local precipitation and to seawater samples from four nearby reef flats. The data revealed that the concentrations of optical brighteners were consistently two orders of magnitude greater than either sodium fluorescein or rhodamine WT, while Eosine Y was rarely detected. Background levels in seawater, by comparison, accounted for 25% or more of the fluorescent compounds detected at the thirteen …
The Effectiveness Of Vertebrate Passage And Prevention Structures: A Study Of Boeckman Road In Wilsonville, Catherine E. De Rivera, Leslie L. Bliss-Ketchum
The Effectiveness Of Vertebrate Passage And Prevention Structures: A Study Of Boeckman Road In Wilsonville, Catherine E. De Rivera, Leslie L. Bliss-Ketchum
Environmental Science and Management Faculty Publications and Presentations
One of the most obvious impacts roads have on the natural world is direct mortality to individual animals that attempt to cross roads. A less obvious but likely more important impact of roads on many species is habitat fragmentation. The ability for individuals to travel between subpopulations is the key to genetic diversity as well as ultimately the survival of the species. Considering these impacts and management goals to increase habitat connectivity, increased attention has been given to creating road design that reduces wildlife collisions. Most studies, however, have been in other countries or regions and most focus on connectivity …
Similarity Of Climate Change Data For Antarctica And Nevada, Corbin Benally, Shahram Latifi, Karletta Chief
Similarity Of Climate Change Data For Antarctica And Nevada, Corbin Benally, Shahram Latifi, Karletta Chief
Undergraduate Research Opportunities Program (UROP)
The correlation between temperature and carbon dioxide concentration in the past one hundred years is studied. Separate graphs containing data from Vostok, Antarctica and the Mojave desert/mountain west (Nevada region) are presented. Using data obtained from these graphs, an attempt is made to explain the results and investigate the similarity of these results for Antarctica and Nevada. The importance of this study lies in the fact that if data show the same trend in the two regions, many findings for climate change in Antarctica may readily be validated and employed for Nevada.
Scraping Behavior In Male White-Tailed Deer As A Potential Means Of Transmitting Chronic Wasting Disease, Travis C. Kinsell
Scraping Behavior In Male White-Tailed Deer As A Potential Means Of Transmitting Chronic Wasting Disease, Travis C. Kinsell
School of Natural Resources: Dissertations, Theses, and Student Research
Chronic wasting disease (CWD) has become a concern for wildlife managers and hunters across the United States. High prevalence of chronic wasting disease (CWD) in older male white-tailed deer (Odocoileus virginianus) suggests that sex-specific social behavior may contribute to the spread of the disease among males. Scraping is a marking behavior performed by male white-tailed deer during the rut in which a pawed depression and associated over-hanging branch are marked with saliva, glandular secretions, urine, and feces. We placed 71 and 35 motion-activated cameras on scrapes in DeSoto National Wildlife Refuge in western Nebraska and eastern Iowa from …
Steps Toward Butternut (Juglans Cinerea L.) Restoration, Sunshine L. Brosi
Steps Toward Butternut (Juglans Cinerea L.) Restoration, Sunshine L. Brosi
Doctoral Dissertations
Butternut (Juglans cinerea L.), a lesser-known relative of black walnut (Juglans nigra L.), is a native tree species beneficial for wildlife, valuable for timber, and part of the great diversity of species in the eastern forests of North America. Populations of butternut are being devastated by butternut canker disease, caused by the fungus Sirococcus clavigignenti-juglandacearum (V.M.G. Nair, Kostichka, & Kuntz), which is thought to be introduced to North America. The disease causes multiple branch and stem cankers that eventually girdle trees. Small population sizes, lack of sprouting, and shade intolerance exacerbates the disease and results in permanent losses of butternut …
Spatiotemporal Dynamics In A Lower Montane Tropical Rainforest, Robert Michael Lawton
Spatiotemporal Dynamics In A Lower Montane Tropical Rainforest, Robert Michael Lawton
Doctoral Dissertations
Disturbance in a forest’s canopy, whether caused by treefall, limbfall, landslide, or fire determines not only the distribution of well-lit patches at any given time, but also the ways in which the forest changes over time. In this dissertation, I use a 25 year record of treefall gap formation find a novel and highly patterned process of forest disturbance and regeneration, providing a local mechanism by examining the factors that influence the likelihood of treefall. I then develop a stochastic cellular automaton for disturbance and regeneration based on the analysis of this long term data set and illustrate the potential …
全球变化与陆地系统综合集成模拟 ——新一代陆地生态系统动态模型 (Dlem), 汉勤 田, 明亮 刘, 弛 张, 巍 任, 小锋 徐, 广生 陈, 超群 吕, 波 陶
全球变化与陆地系统综合集成模拟 ——新一代陆地生态系统动态模型 (Dlem), 汉勤 田, 明亮 刘, 弛 张, 巍 任, 小锋 徐, 广生 陈, 超群 吕, 波 陶
Chaoqun (Crystal) Lu
人类社会从陆地生态系统获取生产和生活资料的同时也作为一种干扰形式改变着地气之间的动态平衡。这三个既独立又相互耦合的子系统共同组成了一个复杂的陆地系统。如何深入理解这一系统的过程和机制是人类应对气候变化挑战的前提条件。陆地生态系统模型作为一种集成工具,已广泛应用于全球变化研究的各个领域,但从输入数据到模型结构和过程等诸多方面仍存在很大的不确定性。近年来,随着大气和地面生态观测网络的不断完善以及遥感等空间技术的不断强大,使陆地生态系统模型进一步发展和突破成为可能。新一代多因子驱动的陆地生态系统动态模型(Dynamic Land Ecosystem Model, DLEM) 正是在这一背景下 应运而生的。本文旨在介绍DLEM的主体框架、输入输出变量、关键过程、主要功能和特点。
Analysis Of Optical Spikes Reveals Dynamics Of Aggregates In The Twilight Zone, Nathan Briggs
Analysis Of Optical Spikes Reveals Dynamics Of Aggregates In The Twilight Zone, Nathan Briggs
Electronic Theses and Dissertations
The "biological pump," whereby phytoplankton grow in the surface ocean, aggregate, and sink, is a critical process contributing to global atmospheric CO2 drawdown and provides the vast majority of food for deep ocean and benthic ecosystems. The strength of this pump hinges on the amount of material that stick together to form larger aggregates, the sinking rates of these aggregates, and the rate at which they are consumed as they sink. However, marine aggregates, also called "marine snow," are often fragile and notoriously difficult to sample, their sinking rates are highly variable and difficult to quantify, and their concentrations can …
Temporal And Spatial Assessment Of Evaporation, Transpiration, And Soil Moisture Redistribution, Brian M. Bird
Temporal And Spatial Assessment Of Evaporation, Transpiration, And Soil Moisture Redistribution, Brian M. Bird
UNLV Theses, Dissertations, Professional Papers, and Capstones
At a native stand of creosote bush (Larrea tridentata) in North Las Vegas, a rainfall simulation study was conducted over a 12 month period from October 2005 to October 2006. Simulated rainfall occurred during the winter, spring, summer, and fall periods. Rainfall simulation systems were positioned on each of 12 plots, each containing a single creosote bush. Simulated rainfall events occurred at night with multiple short pulses designed to maximize infiltration while minimizing ponding. Yearly simulated rainfall amounts were set at 0, 15, 30 and 60 cm (replicated three times) and were approximately 0, 1.5, 3.0 and 6.0 times the …
Algal Biomass Accrual In Relation To Nutrient Availability Along A Longitudinal Gradient In The Upper Green River, Kentucky, Mary Douglas Penick
Algal Biomass Accrual In Relation To Nutrient Availability Along A Longitudinal Gradient In The Upper Green River, Kentucky, Mary Douglas Penick
Masters Theses & Specialist Projects
Nutrient limitation in aquatic ecosystems results from a deficiency in nitrogen or phosphorus levels relative to cellular growth needs. Nutrient limitation of freshwater systems is a function of biotic and abiotic factors. Biotic factors include vascular and nonvascular plant community composition. Abiotic factors include underlying bedrock and land-use activities (e.g. agriculture, septic systems). Nutrient availability directly affects growth, productivity, and community structure of primary producers. The purpose of this study was two-fold: (1) to assess the relationship between ambient algal biomass. and in-stream nutrient levels along the longitudinal course of a river through a transition from weak to well-developed underlying …
Optimal Control Of Species Augmentation Conservation Strategies, Erin Nicole Bodine
Optimal Control Of Species Augmentation Conservation Strategies, Erin Nicole Bodine
Doctoral Dissertations
Species augmentation is a method of reducing species loss via augmenting declining or threatened populations with individuals from captive-bred or stable, wild populations. In this dissertation, species augmentation is analyzed in an optimal control setting to determine the optimal augmentation strategies given various constraints and settings. In each setting, we consider the effects on both the target/endangered population and a reserve population from which the individuals translocated in the augmentation are harvested. Four different optimal control formulations are explored. The first two optimal control formulations model the underlying population dynamics with a system of ordinary differential equations. Each of these …
Mojave Applied Ecology Notes Summer 2010, Scott R. Abella, E. Cayenne Engel
Mojave Applied Ecology Notes Summer 2010, Scott R. Abella, E. Cayenne Engel
Mojave Applied Ecology Notes
Survey of monitoring and management for conservation of rare plants, Roadside restoration techniques in Joshua Tree NP, and an update on renewable energy developments in the Southwestern deserts
Survey Of Resource Managers Completed On Monitoring And Management Actions For Rare Plants In Arizona And Nevada, Scott R. Abella
Survey Of Resource Managers Completed On Monitoring And Management Actions For Rare Plants In Arizona And Nevada, Scott R. Abella
Public Policy and Leadership Faculty Publications
In a collaborative project with Northern Arizona University and more than 35 resource managers in Arizona and Nevada, we completed a survey of monitoring and management activities that are ongoing in these states for conserving populations of rare plants. We sent questionnaires consisting of 16 questions to as many resource managers as possible in these states and had follow-up conversations with several managers willing to share their perspective on ongoing conservation actions. The findings may be interesting for managers to see what issues and management strategies other managers in the same or different regions are grappling with. Results will be …
River Sediment Sampling Methods- Causeway Building And Removal, Dillon Dittmer
River Sediment Sampling Methods- Causeway Building And Removal, Dillon Dittmer
Department of Environmental Studies: Undergraduate Student Theses
Abstract The Environmental Protection Agency (EPA) and U.S. Fish and Wildlife Service (USFWS) suspect that causeways have a negative impact on river ecology both when installed and when removed. The Nebraska Department of Roads routinely uses causeways as a tool in the construction and repair of bridges. Although research has not been conducted on the impact of causeway building and removal data has been collected about the impact of dams, causeways, etc. on estuaries. This data is considered subjective and authors often cite sampling methods as a source of error. Currently there are no widely used handheld sampling methods that …
Renewable Energy Projects In Southwestern Deserts – Update On Our Involvement, Scott R. Abella
Renewable Energy Projects In Southwestern Deserts – Update On Our Involvement, Scott R. Abella
Public Policy and Leadership Faculty Publications
Like many in the conservation field, we have a good understanding of the urgent need for alternative energy sources, but also of the negative environmental tradeoffs of placing renewable energy developments on vast tracts of public lands in southwestern deserts as currently envisioned. We also understand political and economic reasons, good or bad, for not doing some obvious things that make sense for renewable energy like placing solar arrays on building tops in cities, within multi-use contexts such as crops, and on already impacted land when alternative energy projects (right or wrong) are to be placed on public land.
Evaluating Efficacy Of Restoration Techniques, Keys View Road Reconstruction, Joshua Tree National Park, California, U.S.A, Scott R. Abella, E. Cayenne Engel
Evaluating Efficacy Of Restoration Techniques, Keys View Road Reconstruction, Joshua Tree National Park, California, U.S.A, Scott R. Abella, E. Cayenne Engel
Public Policy and Leadership Faculty Publications
Keys View Road in Joshua Tree National Park (JOTR) was recently repaved, resulting in a buffer of vegetation and soil disturbance along the road corridor. In order to mitigate the effects of the repaving, JOTR designed an experimental framework to test various revegetation strategies. They outplanted salvaged and nursery grown native plant species in conjunction with vertical mulch in a fully crossed design (outplanting only, vertical mulch only, outplanting + vertical mulch, bare ground) to examine if any of the treatments most efficiently establish native plant communities.
The Mosquito (Diptera: Culicidae) Fauna Of The Blackwater Ecological Preserve: Effects Of Prescribed Burns And Habitat Type On Mosquito Abundance And Distribution, Norman A. Grefe Lll
The Mosquito (Diptera: Culicidae) Fauna Of The Blackwater Ecological Preserve: Effects Of Prescribed Burns And Habitat Type On Mosquito Abundance And Distribution, Norman A. Grefe Lll
Biological Sciences Theses & Dissertations
While mosquitoes (Diptera: Culicidae) are among the most studied of insect groups, much remains unknown about their distribution and response to environmental impacts such as prescribed burns. Blackwater Ecological Preserve, located near Zuni, Virginia, is a relict long leaf pine barren, parts of which undergo periodic prescribed burns to maintain and restore this fire-dependent ecosystem. To assess the impact of prescribed burns on mosquito activity and to determine associations between seasonal patterns of adult mosquito activity and habitat type, CDC light traps baited with dry ice were set (rom late April through October at Blackwater Ecological Preserve during the 2005 …
Integrated Shoreline Management Decision Tree For Untreated Shorelines, Center For Coastal Resources Management, Virginia Institute Of Marine Science
Integrated Shoreline Management Decision Tree For Untreated Shorelines, Center For Coastal Resources Management, Virginia Institute Of Marine Science
Reports
Rivers & Coast is a periodic publication of the Center for Coastal Resources Management, Virginia Institute of Marine Science. The goal of Rivers & Coast is to keep readers well informed of current scientific understanding behind key environmental issues related to watershed rivers and coastal ecosystems of the Chesapeake Bay.
Lake Mead National Recreation Area Monitoring And Evaluation Of Sensitive Wildlife: Quartlerly Progress Report, Period Ending June 30, 2010, Margaret N. Rees
Lake Mead National Recreation Area Monitoring And Evaluation Of Sensitive Wildlife: Quartlerly Progress Report, Period Ending June 30, 2010, Margaret N. Rees
Wildlife Monitoring
Project 1. Relict Leopard Frog Monitoring, Management, and Research
- All milestones and deliverables are on schedule
- Translocation program completed for this year
- Completed spring-season nocturnal monitoring surveys
- Completed spring-season mark-recapture efforts at Blue Point Spring
- Hosted RLFCT meeting
Project 2. Bald Eagle Winter Monitoring and Evaluation
- This project has been completed and all associated deliverables have been met
Project 3. Peregrine Falcon Monitoring and Evaluation
- This project has been completed and all final report deliverables have been met
- Although not specified in the scope of work for this project, call-broadcast surveys were conducted this quarter to provide a limited assessment …
Limnological Assistance For Lake Mead National Recreation Area: Quarterly Report, Period Ending June 30, 2010, Margaret N. Rees
Limnological Assistance For Lake Mead National Recreation Area: Quarterly Report, Period Ending June 30, 2010, Margaret N. Rees
Limnological Studies
Project 1
- Technical assistance with the implementation of the Interagency Monitoring Action Plan (I-MAP) for Quagga Mussels is ongoing. During this quarter, analysis was completed for 14 adult/juvenile samples from the fall 2009 – spring 2010 sampling.
- Sampling for the first of two small-scale research projects funded by this task agreement (Abundance and settlement at different depths of Lake Mead) was initiated on June 16, 2010.
Project 2
- Topics and proposed analyses have been drafted for annual report development as prescribed by the Plan.
- A plan for developing and organizing NPS limnology-related web pages has been documented and content has …
2010 Adaptive Management Report, Desert Conservation Program
2010 Adaptive Management Report, Desert Conservation Program
Publications (C)
The Desert Conservation Program administers the incidental take permit issued in 2001 by the United States Fish and Wildlife Service in accordance with the Endangered Species Act. Compliance with the permit requires implementation of the Clark County Multiple Species Habitat Conservation Plan. This plan requires an adaptive management program and a biennial report by an independent science advisor to assess the status of the plan and make recommendations for future funding. This 2010 Adaptive Management Report reviews current data on land use trends, habitat loss, species status and plan implementation, and makes recommendations for the future.
Fire: Ecology & Prevention, Justin R. Frey
A Sea Change For Aquatic Sustainability : Meeting The Challenge Of Fish Resources Management And Aquatic Sustainability In The 21st Century, Department Of Fisheries
A Sea Change For Aquatic Sustainability : Meeting The Challenge Of Fish Resources Management And Aquatic Sustainability In The 21st Century, Department Of Fisheries
Fisheries occasional publications
No abstract provided.
Observations Of Little Blue Herons Nesting In North Dakota, And An Instance Of Probable Natural Hybridization Between A Little Blue Heron And A Cattle Egret, Alisa J. Bartos, Lawrence Igl, Marsha A. Sovada
Observations Of Little Blue Herons Nesting In North Dakota, And An Instance Of Probable Natural Hybridization Between A Little Blue Heron And A Cattle Egret, Alisa J. Bartos, Lawrence Igl, Marsha A. Sovada
The Prairie Naturalist
The little blue heron (Egretta caerulea) is native to North America and most commonly breeds along the coast of the southeastern United States and the Gulf of Mexico through Central America and into South America (Rodgers and Smith 1995). In North America, little blue herons rarely nest outside their coastal range. However, nesting has been documented at several locations in the northern plains including Brown, Kingsbury, and Charles Mix counties, South Dakota (Naugle et al. 1996, Tallman et al. 2002); Pope County, Minnesota (Green and Janssen 1975); and possibly in southeastern Saskatchewan (Nero and Lein 1971, Smith et al. 1996). …
Bat Survey Along The Missouri River In Central South Dakota, Alyssa M. Kiesow, Joshua A. Kiesow
Bat Survey Along The Missouri River In Central South Dakota, Alyssa M. Kiesow, Joshua A. Kiesow
The Prairie Naturalist
ats are efficient predators of night-flying insects (Whitaker 1993), particularly in urban, agricultural, and forested areas in South Dakota (Kiesow 2004). In South Dakota, 6 bat species are considered rare and presently monitored by the South Dakota Natural Heritage Program (SDNHP; South Dakota Natural Heritage Program 2002). Because bats serve a vital ecosystem function there is an increased need to conserve bats and their habitats. Hence, the objectives of this project were to determine bat species richness along the Missouri River in central South Dakota. We conducted surveys of bats using mist-nets and acoustic detection from early May to early …