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Articles 8911 - 8940 of 19729
Full-Text Articles in Entire DC Network
Seasonal Fluctuations Of Zooplankton, Dissolved Oxygen, And Temperature In Lake Bemidji, Minnesota, Cody Coyle
Seasonal Fluctuations Of Zooplankton, Dissolved Oxygen, And Temperature In Lake Bemidji, Minnesota, Cody Coyle
Journal of Earth and Life Science
With the current influx of aquatic invasive species in Minnesota lakes, the status of zooplankton has become vital. Zooplankton are at the base of all food chains in aquatic ecosystems, ecosystems that vary greatly throughout a year’s time. The objectives of this study were to 1) track the location of zooplankton throughout the water column for an entire year, and 2) establish relationships between zooplankton location and specific water column characteristics. Zooplankton, dissolved oxygen, and temperature samples were collected bi-monthly at various depths at the deepest point in the southern basin of Lake Bemidji. Zooplankton were most abundant in the …
Age-0 Walleye Growth Rates Following Spiny Water Flea Bythotrephes Longimanus Invasion, Joseph Amundson
Age-0 Walleye Growth Rates Following Spiny Water Flea Bythotrephes Longimanus Invasion, Joseph Amundson
Journal of Earth and Life Science
Within Voyageurs National Park, spiny water flea Bythotrephes longimanus has reduced Lake Kabetogama and Rainy Lake native zooplankton biomass during summer peak by 40-60%. Subsequently, planktivorous age-0 Yellow Perch Perca flavescens growth has decreased. A possible trophic cascade may influence predatory fish growth rates like that of age-0 Walleye Sander vitreus. Using seine net and electrofishing data, age-0 Walleye growth rates were modeled as a linear function of growing degree days (GDD) and the slope was compared between pre- and post-spiny water flea establishment. Nearby Lake Vermilion, assumed to have been unaffected by spiny water flea until 2015 and …
Burbot Activity In Relation To Light Penetration On Lake Bemidji, Mn, Hunter Weidenborner, Josh Janecek
Burbot Activity In Relation To Light Penetration On Lake Bemidji, Mn, Hunter Weidenborner, Josh Janecek
Journal of Earth and Life Science
Burbot Lota lota is the only freshwater member of the family Gadidae and has a circumpolar distribution in cold-water regions. Information related to Burbot biology is limited in comparison to most fishes. Snow pack depth and ice conditions influence light penetration and therefore primary production levels. Primary production can have cascading effects on higher trophic levels. Therefore, the objective of this study was to observe if light levels penetrating through cleared and covered ice has an effect on Burbot activity in Lake Bemidji, MN. Angling for Burbot occurred for a minimum of 30 four hour sample periods at both cleared …
Primeness In Early Season Arkansas Raccoon Pelts, D. Blake Sasse
Primeness In Early Season Arkansas Raccoon Pelts, D. Blake Sasse
Journal of the Arkansas Academy of Science
Trapping seasons in the United States are generally set around the time of the year when pelts are in “prime” condition and are in their most valuable state. In order to assess whether the start of the Arkansas trapping season is at an appropriate date 122 raccoons were captured during the month of November in 2014 and 2015. Based on the evaluation of experienced fur dealers, the percentage of pelts in prime condition was then assessed on weekly and half-monthly basis. This study indicates that starting the trapping season in the last half of the month may maximize the percentage …
Evaluation Of Methods Used To Improve Grasslands As Ring-Necked Pheasant (Phasianus Colchicus) Brood Habitat, Mandy Orth
Evaluation Of Methods Used To Improve Grasslands As Ring-Necked Pheasant (Phasianus Colchicus) Brood Habitat, Mandy Orth
Electronic Theses and Dissertations
Management practices designed for upland game species often focus on nest survival and hen winter survival due to the importance of these life history stages on population vital rates. However, chick survival is an important component of gallinaceous bird population dynamics, but it is poorly understood and often tends to be overlooked. Ideal brood habitat not only provides open understory for easy movement and canopy cover for protection, but also provides an abundance of arthropod foods for chicks. It has been hypothesized that restricted movement of chicks through thick vegetation in unmanaged grasslands results in lower brood survival rates. Research …
Evaluating Bighorn Sheep Herd Response After Selective Removal Of Mycoplasma Ovipneumoniae Chronic Shedders, Tyler J. Garwood
Evaluating Bighorn Sheep Herd Response After Selective Removal Of Mycoplasma Ovipneumoniae Chronic Shedders, Tyler J. Garwood
Electronic Theses and Dissertations
Infected individuals vary in their contribution to disease persistence, and chronically infected individuals may sustain disease in a population. One disease that might persist in a population through chronically infected individuals is pneumonia in wild sheep. Mycoplasma ovipneumoniae (Mo), a pathogen of Caprinae commonly present in domestic sheep and goats, strongly correlates with pneumonia epizootics when it infects wild sheep populations. These epizootics can cause 40-100% herd mortality in an initial all-age dieoff, precipitate annual lamb mortality as high as 100% in following years, and sustain adult mortality long after initial all-age dieoffs. We conducted an experiment in the Black …
Aquatic Invertebrate Community Structure, Biological Condition, Habitat, And Water Quality At Ozark National Scenic Riverways, Missouri, 2005-2014, David E. Bowles, L. W. Morrison, J. T. Cribbs
Aquatic Invertebrate Community Structure, Biological Condition, Habitat, And Water Quality At Ozark National Scenic Riverways, Missouri, 2005-2014, David E. Bowles, L. W. Morrison, J. T. Cribbs
Journal of the Arkansas Academy of Science
Ozark National Scenic Riverways (OZAR) was established to protect the corridor of the Current River and its major tributary, the Jacks Fork. The Current River is one of the few remaining free-flowing rivers in the U.S., with much of its base flow coming from several large springs. To assess the biological condition of these rivers, aquatic invertebrate community structure was monitored from 2005 to 2014. Benthic invertebrate samples and associated habitat and water quality data were collected from each of nine sampling sites using a Slack-Surber sampler. The Stream Condition Index (SCI), a multimetric index that incorporates taxa richness, EPT …
Zero Textbook Cost Syllabus For Env 1003 (Fundamentals Of Ecology-Lecture And Recitation), Rebecca Kulp
Zero Textbook Cost Syllabus For Env 1003 (Fundamentals Of Ecology-Lecture And Recitation), Rebecca Kulp
Open Educational Resources
This course introduces students not only to ecological terms and concepts but demonstrates how the scientific process adds new knowledge to the field. Through recitation, you will be able to explore the many platforms science gets communicated to the community, and decide for yourself whether you trust how the information is being presented.
Apparent Survival Of Snowy Plovers Varies Seasonally, Nora C. Papian
Apparent Survival Of Snowy Plovers Varies Seasonally, Nora C. Papian
Cal Poly Humboldt theses and projects
Survival is an important vital rate that contributes to population viability, but is infrequently monitored and studied, especially compared to productivity. Furthermore, factors that limit survival and the relative effect on survival are often unknown. I used mark-resight observations of a small (~350) population of threatened Snowy Plovers (Charadrius nivosus nivosus) to quantify seasonal and annual variation in survival and movement between three coastal locations across ~70 km in Humboldt County, California. The return of individuals to non-breeding flocks at three locations was high between years (75-81%). Movement between three locations varied greatly, although most (n = 137) …
Seasonal Home Range Variation And Spatial Ecology Of Peregrine Falcons (Falco Peregrinus) In Coastal Humboldt County, Ca, Elizabeth-Noelle F. Morata
Seasonal Home Range Variation And Spatial Ecology Of Peregrine Falcons (Falco Peregrinus) In Coastal Humboldt County, Ca, Elizabeth-Noelle F. Morata
Cal Poly Humboldt theses and projects
Peregrine falcons (Falco peregrinus) are renowned for their migratory habits, with ‘peregrinus’ often translated as ‘wanderer’ or ‘pilgrim’. However, their migratory habits may differ by population and some peregrine may falcons forgo migration when climate and resources remain stable. To examine peregrine falcon home range and space use, I fitted GPS-satellite transmitters to nine breeding adults in coastal northern California, an area with a mild climate and abundant waterbird populations. I used kernel density estimates and time-local convex hulls to examine seasonal home ranges and within-home range habitat use. All nine peregrine falcons remained resident in …
The Influence Of Microclimate And Local Adaptation For A Climate-Sensitive Species (Aplodontia Rufa), Jennie K. Jones Scherbinski
The Influence Of Microclimate And Local Adaptation For A Climate-Sensitive Species (Aplodontia Rufa), Jennie K. Jones Scherbinski
Cal Poly Humboldt theses and projects
Climate change models and analyses predict a disproportionate impact on climatically sensitive species such as the mountain beaver (Aplodontia rufa). Mountain beavers have physiological constraints that limit their distribution to cool, moist climates. While mountain beavers have persisted through past periods of climate change, increasing temperature since the last glacial maximum is believed to have had a strong influence in reducing their range. This is particularly true for the Point Arena subspecies (A. r. nigra, “PAMB”), found towards the southwestern edge of their range on the coast of California. Here, I examined the climatic niche of …
Evaluating Habitat Selection Models To Improve Site Selection In A Population Monitoring Program For Townsend's Big-Eared Bats (Corynorhinus Townsendii), Katrina J. Smith
Evaluating Habitat Selection Models To Improve Site Selection In A Population Monitoring Program For Townsend's Big-Eared Bats (Corynorhinus Townsendii), Katrina J. Smith
Cal Poly Humboldt theses and projects
Winter roost (hibernacula) surveys offer a unique opportunity to monitor Townsend’s big-eared bats (Corynorhinus townsendii) while the population is generally closed, using a simple count method to census the population. Existing knowledge of C. townsendii hibernacula facilitates long-term population trend analysis but improving the accuracy of trend estimates requires identification of additional hibernacula to increase the proportion of the population monitored. Over 800 caves are known within Lava Beds National Monument; 322 of these have never been surveyed in the winter and could potentially hold a substantial portion of the C. townsendii population currently missing from the annual …
Export Of Invertebrate Drift From Fishless Headwater Streams, Jonathan M. Hollis
Export Of Invertebrate Drift From Fishless Headwater Streams, Jonathan M. Hollis
Cal Poly Humboldt theses and projects
An understanding of ecological linkages between headwater systems and downstream habitats is needed to enhance management practices for aquatic conservation. I quantified and described the export of invertebrate drift from fishless headwater streams to assess its potential importance to downstream populations of coastal cutthroat trout (Oncorhynchus clarki clarki) in the lower Klamath River in northern California. From June 2015 through April 2016, I sampled invertebrate drift in six fishless headwaters in the sub-basins of Tectah, Ah Pah, and Tarup creeks. Concurrently, I collected invertebrate drift and trout diet samples from adjoining fish-bearing streams. Drift export rates were lowest …
Effects Of Main-Stem Impoundments On Hydrology And Larval Fish Communities In Major Tributaries Of Two Large Midwestern Rivers, Jordan Pesik
Effects Of Main-Stem Impoundments On Hydrology And Larval Fish Communities In Major Tributaries Of Two Large Midwestern Rivers, Jordan Pesik
Masters Theses
Anthropogenic modifications, like impoundments, have altered natural environmental conditions in most lotic systems and impacted fish ecology in many ways. We examined the effect of large river impoundments on fish reproductive behavior by studying the larval fish communities in tributaries of the impounded Illinois and unimpounded Wabash Rivers. We hypothesized that larval fish communities would be similar between the geographically proximal systems, but temporal structuring would depend largely on flow regimes. Biweekly larval densities were greatest among all taxa in the Wabash system, though overall communities were similar between systems. Of the six tributaries, the four smallest rivers were most …
Forest Structural Complexity And Net Primary Production Resilience Across A Gradient Of Disturbance In A Great Lakes Ecosystem, Lisa T. Haber
Forest Structural Complexity And Net Primary Production Resilience Across A Gradient Of Disturbance In A Great Lakes Ecosystem, Lisa T. Haber
Theses and Dissertations
Forests are an important component of the global carbon (C) cycle and contribute to climate change mitigation through atmospheric C uptake and storage in biomass and soils. However, the forest C sink is susceptible to disturbance, which modifies physical and biological structure and limits spatial extent of forests. Unlike severe, stand-replacing disturbances that reset forest successional trajectories and may simplify ecosystem structure, moderate severity disturbances may instead introduce complexity in ways that sustain net primary production (NPP), leading to the phenomenon of “NPP resilience.” In this study, we examined the linkage between disturbance severity and ecosystem biological and physical structural …
Evolving Reproductive Isolation In The Parasitic Wasp Genus Cotesia, Justin P. Bredlau
Evolving Reproductive Isolation In The Parasitic Wasp Genus Cotesia, Justin P. Bredlau
Theses and Dissertations
Parasitic wasps are highly diverse and play a major role in suppression of herbivorous pest populations, but relatively little is known of the mechanisms driving their diversity. Molecular studies indicate that cryptic species complexes resulting from adaptations to specific hosts or host-foodplants may be common. The gregarious endoparasitoid, Cotesia congregata (Braconidae), is a model system for understanding parasitic wasp biology. It is reported to attack at least 15 species of sphingid caterpillars, most of which are plant family specialists. Molecular studies have demonstrated genetic differentiation of two host-foodplant complex sources originating from Manduca sexta on tobacco (MsT) and Ceratomia catalpae …
Red-Headed Woodpecker Full Annual Cycle Ecology At Fort A.P. Hill, Virginia, Benjamin Nickley
Red-Headed Woodpecker Full Annual Cycle Ecology At Fort A.P. Hill, Virginia, Benjamin Nickley
Theses and Dissertations
The red-headed woodpecker is a primary cavity excavator found throughout the Eastern Deciduous Forest and parts of the Great Plains. Although widespread, the red-headed woodpecker is generally considered uncommon, with patchily distributed populations. Over the past 50 years, this species has experienced precipitous, range-wide declines. The red-headed woodpecker uses a variety of cover types to meet resource needs across the annual cycle, ranging from oak savannas and wetlands, to mature beech forests and urban parks. Given their apparent adaptability to such a wide range of habitats, causes of declines are perplexing. To understand and stem declines, recent studies have focused …
Black-Tailed Prairie Dog (Cynomys Ludovicianus) State-And-Transition Model For Loamy Ecological Sites In Mlra 62 In Custer State Park, South Dakota, Mark R. Hendrix
Black-Tailed Prairie Dog (Cynomys Ludovicianus) State-And-Transition Model For Loamy Ecological Sites In Mlra 62 In Custer State Park, South Dakota, Mark R. Hendrix
Electronic Theses and Dissertations
Black-tailed prairie dogs (Cynomys ludovicianus) are native burrowing rodents that occupy large areas in the shortgrass and mixed-grass prairies of the Northern Great Plains. They are an important component of these prairie systems due to their impacts on plant communities. Currently State-and-Transition models (STMs) for grassland Ecological Site Descriptions (ESDs) address grazing by livestock as a major factor affecting states and phases within states. Impacts from other grazers, such as prairie dogs, are either not addressed directly, or are included only in a transition to a generalized early seral state. There are, however, dramatic differences in plant communities …
Large Effect Quantitative Trait Loci For Salicinoid Phenolic Glycosides In Populus: Implications For Gene Discovery, Scott A. Woolbright, Brian J. Rehill, Richard L. Lindroth
Large Effect Quantitative Trait Loci For Salicinoid Phenolic Glycosides In Populus: Implications For Gene Discovery, Scott A. Woolbright, Brian J. Rehill, Richard L. Lindroth
Aspen Bibliography
Genomic studies have been used to identify genes underlying many important plant secondary metabolic pathways. However, genes for salicinoid phenolic glycosides (SPGs)—ecologically important compounds with significant commercial, cultural, and medicinal applications—remain largely undescribed. We used a linkage map derived from a full‐sib population of hybrid cottonwoods (Populus spp.) to search for quantitative trait loci (QTL) for the SPGs salicortin and HCH‐salicortin. SSR markers and primer sequences were used to anchor the map to the V3.0 P. trichocarpa genome. We discovered 21 QTL for the two traits, including a major QTL for HCH‐salicortin (R2 = .52) that colocated …
The Impact Of Reconstructed Soils Following Oil Sands Exploitation On Aspen And Its Associated Belowground Microbiome, Franck Stefani, Nathalie Isabel, Marie-Josee Morency
The Impact Of Reconstructed Soils Following Oil Sands Exploitation On Aspen And Its Associated Belowground Microbiome, Franck Stefani, Nathalie Isabel, Marie-Josee Morency
Aspen Bibliography
Oil sands surface mining in the Athabasca region of northern Alberta (Canada) is a significant anthropogenic disturbance that resets boreal forest development and succession to early stages. During surface mining, the vegetation is cleared, the topsoil is salvaged, and the overburden (the layer of sand and clay in between the topsoil and the oil sands) is piled (see Fig. 2 in Audet et al.1 for an explanation of the land-reclamation procedure). After mining is finished, the landforms (composed of overburden and tailings sand) are capped with organic matter-rich soil covers made of either upland-derived forest floor-mineral mix (FFMM) or a …
Hart Prairie Preserve Site Visit To Assess Aspen Health Nature Conservancy, Flagstaff, Az, Amanda Grady
Hart Prairie Preserve Site Visit To Assess Aspen Health Nature Conservancy, Flagstaff, Az, Amanda Grady
Aspen Bibliography
On June 11, 2018, Amanda Grady, Entomologist, Arizona Zone, Forest Health Protection, performed a site visit to evaluate aspen health on the Nature Conservancy lands at Heart Prairie Preserve (HPP) near Flagstaff. Specifically, the evaluation was to determine whether or not the aspen within exclosures on Fern Mountain have symptoms or signs of Oystershell scale (OSS), an emergent forest pest contributing to aspen decline in northern Arizona.
Effects Of Climate Change On Forest Vegetation In The Northern Rockies Region, Robert E. Keane, Mary Frances Mahalovich
Effects Of Climate Change On Forest Vegetation In The Northern Rockies Region, Robert E. Keane, Mary Frances Mahalovich
Aspen Bibliography
No abstract provided.
Climate-Induced Gradients Of Populus Sp. Forest Biomass On The Territory Of Eurasia, Usoltev Vladimir Andreevich, Omid Shobairi, Chasovskikh Viktor Petrovich
Climate-Induced Gradients Of Populus Sp. Forest Biomass On The Territory Of Eurasia, Usoltev Vladimir Andreevich, Omid Shobairi, Chasovskikh Viktor Petrovich
Aspen Bibliography
On the basis of the compiled database in a number of 413 sample plots with determinations of forest biomass of the genus Populus sp. on the territory of Eurasia from France to southern China and Japan statistically significant transcontinental decreasing of stem, above ground and total biomass as in the direction from northern temperate to subequatorial zonal belt and in the direction from the Atlantic and Pacific coasts to the continentality pole in Siberia is established. Unlike wood story, understory biomass in these directions has not decreased, and increasing. The root: shoot ratio increases in the range between northern temperate …
New Applications Of Radio Frequency Identification Stations For Monitoring Fish Passage Through Headwater Road Crossings And Natural Reaches, Ian R. Macleod, Charles J. Gagen
New Applications Of Radio Frequency Identification Stations For Monitoring Fish Passage Through Headwater Road Crossings And Natural Reaches, Ian R. Macleod, Charles J. Gagen
Faculty Publications - Biological Sciences
Within the Ouachita National Forest, roads and streams intersect each other thousands of times. Many of these road crossings alter stream hydrology and potentially limit longitudinal fish movement. To investigate the potential impacts of these road crossings on fish passage, we monitored movements of 3 native fish species (n = 2,171) individually tagged with radio frequency identification (RFID) tags in 2012 and 2013. We installed solar-powered RFID stations in 2 streams with road crossings and 2 reference streams without road crossings. Each of the 4 monitoring stations included a pair of antennas bracketing a road crossing (or similarly-sized natural reach) …
Camera Traps In Wildlife Research: Through My Lens, Bryson P. Allen
Camera Traps In Wildlife Research: Through My Lens, Bryson P. Allen
Undergraduate Theses, Professional Papers, and Capstone Artifacts
Wildlife species can be difficult to study because they can have very large ranges and can be wary of observers. Researchers have been using camera traps in recent decades as a way to study wildlife behavior and population metrics. Here I explore the history of these tools in wildlife biology, their possible applications, and limitations.
An Investigation Of Implicit And Explicit Memory In The Survival Memory Paradigm, Allison M. Wilck
An Investigation Of Implicit And Explicit Memory In The Survival Memory Paradigm, Allison M. Wilck
Legacy Theses & Dissertations (2009 - 2024)
Robust support has been found for a survival processing effect on memory when information is encoded for its fitness-relevance (Nairne, Thompson, & Pandeirada, 2007). However, support for this effect has been limited to forms of memory that require intentional, explicit retrieval processes. Thus far, the literature has failed to identify the effect in implicit, automatic memory using conceptual and perceptual production tasks (McBride, Thomas, & Zimmerman, 2013; Tse & Altarriba, 2010). In the current study, an alternative implicit memory test that employs different memory processes was employed in a further attempt to examine the survival processing effect in implicit memory. …
Whole-Canopy Net Ecosystem Exchange And Water Use Efficiency In An Intermittent-Light Environment -- Dynamic Approach, Sergey Nikolayevich Kivalov
Whole-Canopy Net Ecosystem Exchange And Water Use Efficiency In An Intermittent-Light Environment -- Dynamic Approach, Sergey Nikolayevich Kivalov
Legacy Theses & Dissertations (2009 - 2024)
An observed 20-30% increase in forest net ecosystem exchange (NEE) on partly cloudy days is often attributed to there being more uniform canopy illumination by diffuse radiation when clouds are present. However, the sky on such days is typically populated by fair-weather cumulus clouds, bringing dynamically changing shadow-to-light conditions on the order of minutes to the forest, with radiation alternating from 1000 W m^-2 in the clear sky to less than 400 W m^-2 in under-cloud shadows. These dynamically changing conditions cannot be investigated by the conventional time-averaged eddy-covariance flux method, which requires nearly steady-state turbulent conditions over much longer …
Ecology, W. S. Lynn, Eric G. Strauss
Ecology, W. S. Lynn, Eric G. Strauss
Center for Urban Resilience Scholarship
No abstract provided.
Why Humans Are Different, Tara Fox Hall
Why Humans Are Different, Tara Fox Hall
Animal Sentience
A central human problem is our inference from the fact that we are the world’s most intelligent species to the alleged fact that we are superior. This inference is not mandatory. Successfully combating this inference may require the threat of a large-scale catastrophe to our species.
Two Fallacies In Comparisons Between Humans And Non-Humans, Don Ross
Two Fallacies In Comparisons Between Humans And Non-Humans, Don Ross
Animal Sentience
The hypothesis that humans are superior to non-humans by virtue of higher cognitive powers is often supported by two recurrent fallacies: (1) that any competence shown by humans but not by our closest living relatives (apes) must be unique to humans; and (2) that grades of intelligence can be inferred from behavior without regard to motivational structures.