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Articles 331 - 360 of 6322

Full-Text Articles in Terrestrial and Aquatic Ecology

Activity, Movement, And Reproductive Patterns Of The Northern Giant Musk Turtle (Staurotypus Triporcatus) In Belize, Larissa Sage Saarel Jan 2025

Activity, Movement, And Reproductive Patterns Of The Northern Giant Musk Turtle (Staurotypus Triporcatus) In Belize, Larissa Sage Saarel

Graduate Theses/Dissertations

The Northern Giant Musk Turtle (Staurotypus triporcatus), a near-threatened species native to southern Mexico, Guatemala, Belize, and western Honduras, faces multiple environmental challenges, yet its activity patterns, movement patterns, and reproductive biology remain poorly understood. This thesis investigates both seasonal activity and reproductive cycles of female S. triporcatus in Belize. To assess diel and seasonal activity, I tracked 12 female turtles and collected data using activity loggers. I also collected movement data through radio-telemetry and acoustic tracking methods. Results indicated that the species is primarily nocturnal, with increased activity during the wet season, particularly during flooding events. Turtles …

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Responses Of Native And Invasive Aquatic Vegetation To Changes In Water Depth In An Ozark Spring-Fed Pond, Daphne Miles Jan 2025

Responses Of Native And Invasive Aquatic Vegetation To Changes In Water Depth In An Ozark Spring-Fed Pond, Daphne Miles

Graduate Theses/Dissertations

Spring-fed aquatic ecosystems in the Ozark Highlands are characterized by stable water depths, clear water, and diverse aquatic vegetation (filamentous algae, submerged, floating, and emergent plants). Sudden changes in water depth can impact aquatic vegetation dynamics but the impacts of prolonged changes are poorly understood. I investigated seasonal and annual changes to aquatic vegetation abundance in a spring impoundment during and after a two-year period of low water depth that was caused by a broken outlet below an artificial dam. Water depth was significantly lower in 2020 and 2021 (low water years), compared to 2022 and 2023 (high water years). …

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Assessing Ecological And Food Web Responses To Small-Scale Stream Restorations In Urban And Agricultural Streams, Sydney Mcandrews Jan 2025

Assessing Ecological And Food Web Responses To Small-Scale Stream Restorations In Urban And Agricultural Streams, Sydney Mcandrews

Masters Theses

Urban and agricultural streams across the Midwestern United States are vulnerable to elevated pollution, eutrophication, habitat simplification, and losses of sensitive species. Instream habitat restoration is increasingly used to mitigate the impacts of rapid land-use change. This study synthesizes habitat and biological responses from a 2020 urban stream restoration in the Saline Branch (Urbana, Illinois) and evaluates food web responses from both the Saline Branch and a 2010 restoration in Kickapoo Creek (Charleston, Illinois), an agricultural stream. In the Saline Branch, four years of fish and three years of habitat and macroinvertebrate pre-restoration surveys were compared to three years of …

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Bugs In The Flux: Links Between Arthropod Diversity And Spatial Variation Of Soil Respiration In A Temperate Forest, Erin-Darby H. Mcclain Jan 2025

Bugs In The Flux: Links Between Arthropod Diversity And Spatial Variation Of Soil Respiration In A Temperate Forest, Erin-Darby H. Mcclain

Theses and Dissertations

Soil respiration (Rs) is the largest terrestrial flux of carbon (C) to the atmosphere, with heterotrophic contributions to Rs varying spatially and temporally. While microbes are the primary and most thoroughly studied source of soil heterotrophic respiration (Rh), contributions from higher trophic organisms, including arthropods, are rarely quantified and poorly understood. Arthropod abundance and diversity correspond with variation in soil microclimate, which is influenced by site factors including canopy structure, site productivity, and disturbance. However, the extent to which these site factors influence arthropod abundance and diversity, and consequently, spatial variation in Rs is not known. The objective of our …

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Temporal And Spatial Changes In Phytoplankton Communities In A Shallow Coastal Estuary, Justin Osborne, Jeneil Patel, Jennifer L. Debose Jan 2025

Temporal And Spatial Changes In Phytoplankton Communities In A Shallow Coastal Estuary, Justin Osborne, Jeneil Patel, Jennifer L. Debose

Gulf and Caribbean Research

No abstract provided.

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One Rung At A Time: Climbing The Ladder Toward Aquatic Connectivity In Eastern South Dakota, Evan Spencer Jan 2025

One Rung At A Time: Climbing The Ladder Toward Aquatic Connectivity In Eastern South Dakota, Evan Spencer

Electronic Theses and Dissertations

Roads and streams are synonymous with their connection to movement, the acquisition of resources, and as pathways to new opportunities. However, the factors that define good roads and ecologically connected streams are rarely without conflict. Road infrastructure at stream-road crossings has the potential to fragment stream networks. Tube culverts, where streams pass under the road through metal pipes, are particularly concerning for stream connectivity. Undersized, aging, or inappropriately installed culverts can develop vertical drops at the outflow due to high velocities and stream bed scouring. The outlet drop can function as a barrier, preventing the upstream movement of fish. Due …

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Binoculars To Bytes: Development And Field Validation Of An Ai-Driven System For Avian Monitoring, Christian J. Dupree Jan 2025

Binoculars To Bytes: Development And Field Validation Of An Ai-Driven System For Avian Monitoring, Christian J. Dupree

Graduate Student Theses, Dissertations, & Professional Papers

Autonomous camera-trap arrays coupled with artificial-intelligence (AI) vision can lift bird monitoring beyond the spatial, temporal, and labor limits of traditional field surveys. We present Binoculars to Bytes (B2B), an open-source pipeline that turns 180–360° time-lapse imagery into analysis-ready avian data. At Freezout Lake Wildlife Management Area (Montana, USA) the system ran four-hour morning deployments during spring and fall migrations (2023–2024). A YOLO-NAS detector, incrementally refined with a “Specialized Localized Iterative Model” workflow, quadrupled local accuracy and, after confidence-based species-binning, cut false-positive rates in half. Daily AI species lists were benchmarked against contemporaneous eBird citizen-science checklists and recovered ≥ …

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Ocean Acidification Mitigation: Potential Expansion Of Sav Restoration Strategy In The Chesapeake Bay, Cree N. Taylor Jan 2025

Ocean Acidification Mitigation: Potential Expansion Of Sav Restoration Strategy In The Chesapeake Bay, Cree N. Taylor

UROP Posters

Zostera marina is a species of marine macrophyte that has been largely prioritized in past submerged aquatic vegetation (SAV) restoration initiatives within the Chesapeake Bay because of its 1) previous abundance, 2) demonstrated carbon burial abilities, and 3) observed ability for meadows of Z. marina to ameliorate low pH conditions. Due to the temperature variability and poor water quality associated with anthropogenic disturbances in the Chesapeake Bay, Z. Marina beds have experienced several die-off events with limited capacity for regrowth. This systematic review explored the possible benefits of focusing future SAV recovery initiatives on ensuring a diverse variety of SAV …

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Chironomids Shed Light On Organic Matter Dynamics In Macroinvertebrate Communities In Prairie Pothole Lakes In West-Central Minnesota, Usa, Tracey M. Anderson, Sarah G. Winikoff, Michael L. Sorensen, Melissa L. Rudeen Jan 2025

Chironomids Shed Light On Organic Matter Dynamics In Macroinvertebrate Communities In Prairie Pothole Lakes In West-Central Minnesota, Usa, Tracey M. Anderson, Sarah G. Winikoff, Michael L. Sorensen, Melissa L. Rudeen

Biology Publications

The Prairie Pothole Region (PPR) in North America is characterized by a high density of wetlands that can range from temporary habitats to small lakes. Much of the PPR has been converted to agriculture resulting in outright habitat loss, eutrophication, sedimentation, introduction of agrochemicals, and the introduction of invasive plants and animals. We compared two prairie pothole lakes, Cottonwood Lake and Page Lake, to assess the functional roles and trophic structure of the macroinvertebrate communities in this highly altered landscape. We collected macroinvertebrate samples from littoral and profundal regions of each lake with an Ekman grab sampler in winters of …

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The Nesting Ecology Of Southern Two-Lined Salamanders (Eurycea Cirrigera) In Urban Streams, Leah T. Rittenburg, Emma G. Downing, Todd Pierson Jan 2025

The Nesting Ecology Of Southern Two-Lined Salamanders (Eurycea Cirrigera) In Urban Streams, Leah T. Rittenburg, Emma G. Downing, Todd Pierson

Faculty Articles

Urbanization alters many aspects of stream ecosystems, and its effects upon wildlife will likely increase as more watersheds become developed. This may be particularly true for species with complex life histories, which could be vulnerable in different life stages. Eurycea cirrigera (Green) (Southern Two-lined Salamanders) are common members of many stream communities in the southeastern United States, and they prefer to nest in cobble with little sedimentation—a microhabitat that is threatened by stream degradation. We collected data on the nesting ecology of this amphibian species in urban streams in Atlanta, Georgia, to evaluate microhabitat availability, nest-site selection, and the influence …

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Community Assembly Across Environmental Gradients: Contrasting Patterns Of Funtional Convergence And Divergence In California Coastal Grasslands, Ernesto Chavez- Velasco Jan 2025

Community Assembly Across Environmental Gradients: Contrasting Patterns Of Funtional Convergence And Divergence In California Coastal Grasslands, Ernesto Chavez- Velasco

Cal Poly Humboldt theses and projects

Elucidating how plant community assembly processes interact across spatial scales to shape ecosystem function remains a central challenge in ecology. These processes are often hierarchical, with broad scale environmental filters constraining the composition of local communities. I investigated these hierarchical processes across three California coastal grassland sites spanning a ~1000 km gradient. At these sites, I measured community composition, standing biomass, four functional traits (plant height, specific leaf area, leaf dry matter content, and leaf lobedness), and estimated species’ environmental niches. To identify assembly mechanisms, I used null models to assess functional convergence or divergence and scaled these patterns with …

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The Effects Of Salinity On The Cutaneous Microbiome And Pathogen Infection On The Pacific Tree Frog (Pseudacris Regilla) In Monterey Bay, California, Usa, Hannah Eunhae Kim Jan 2025

The Effects Of Salinity On The Cutaneous Microbiome And Pathogen Infection On The Pacific Tree Frog (Pseudacris Regilla) In Monterey Bay, California, Usa, Hannah Eunhae Kim

EWU Masters Thesis Collection

Global climate change and infectious diseases are considered a leading cause of amphibian population declines worldwide. Changes in precipitation and salinity have altered watershed systems and microbial communities, reducing habitat availability and physiological performances for amphibian survival. The salt refuge hypothesis, however, is a proposed explanation that higher saline environments may reduce susceptibility to pathogens such as Batrachochytrium dendrobatidis (Bd). The Moro Cojo Slough State Marine Reserve (MCSSMR) (California, USA) is known as an abundant breeding ground for endangered/threatened amphibian species. To test and expand the salt refuge hypothesis, I evaluated Bd prevalence and intensity and the cutaneous microbiome of …

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Précis Of The Edge Of Sentience: Risk And Precaution In Humans, Other Animals, And Ai, Jonathan Birch Jan 2025

Précis Of The Edge Of Sentience: Risk And Precaution In Humans, Other Animals, And Ai, Jonathan Birch

Animal Sentience

We often face grave practical decisions that seem to hinge on whether a system is sentient. This family of cases includes invertebrate animals, people who are unresponsive after brain injury, fetuses, neural organoids, and now AI technologies. We must decide what to do despite ongoing disagreement about the nature of sentience. In our state of uncertainty, we should pragmatically transform the question from “Is it sentient?” to “Is it a sentience candidate, an investigation priority, or neither?”. When a system is a sentience candidate, it is negligent to fail to consider precautions. We should instead evaluate precautions for their proportionality …

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In The Footsteps Of Moose: Using Non-Invasive Techniques To Identify Cause-Specific Calf Mortalities And Evaluate Moose (Alces Alces) Movements Pertaining To Mineral Lick Locations On Ancestral Lands Of The Grand Portage Ojibwe, Anna B. Weesies Jan 2025

In The Footsteps Of Moose: Using Non-Invasive Techniques To Identify Cause-Specific Calf Mortalities And Evaluate Moose (Alces Alces) Movements Pertaining To Mineral Lick Locations On Ancestral Lands Of The Grand Portage Ojibwe, Anna B. Weesies

Electronic Theses and Dissertations

Following a sharp moose (Alces alces; mooz, Anishinaabemowin, Ojibwe language) population decline in northeastern Minnesota during the early 2000s, the Grand Portage Band of Lake Superior Chippewa initiated a long-term moose collaring effort to assess survival and mortality causes. Moose are a culturally important species to the Band, with annual subsistence hunts held on the Reservation and adjacent 1854 Ceded Territory. Continued research guides culturally appropriate management decisions aimed at bolstering calf and adult survival, helping to preserve this moose in Minnesota today and for subsequent generations. Chapter 1 identifies cause-specific calf mortality rates in this multi-predator system using minimally …

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Characterizing A Free-Roaming Cat Population To Predict Predation Of Threatened Species In An Island Ecosystem, Sarah Gheida Jan 2025

Characterizing A Free-Roaming Cat Population To Predict Predation Of Threatened Species In An Island Ecosystem, Sarah Gheida

Electronic Theses and Dissertations

No abstract provided.

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An Integrated Wetland Condition Index And Environmental Metric Framework For The Prairie Pothole Region, Mercedes L. Batalla Jan 2025

An Integrated Wetland Condition Index And Environmental Metric Framework For The Prairie Pothole Region, Mercedes L. Batalla

Electronic Theses and Dissertations

The USDA-NRCS Agricultural Conservation Easement Program (ACEP) assists landowners with protecting, restoring, and enhancing wetlands. Evaluating wetland conservation efforts is crucial for informing future management decisions. However, assessment frameworks vary across regions and among stakeholders. The Prairie Pothole Region is an ecologically unique landscape characterized by its abundance of wetlands that provide important ecosystem services. To evaluate wetlands enrolled in ACEP, I sampled forty-five semi-permanent wetlands in the Prairie Pothole Region from July – August 2023 and 2024. I selected and sampled twenty-six wetlands enrolled in ACEP. Nineteen additional wetlands not enrolled in ACEP were also sampled; these included nine …

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The Role Of Floodplain Complexity In Wood Turtle Habitat Use, Laura S. Deming Jan 2025

The Role Of Floodplain Complexity In Wood Turtle Habitat Use, Laura S. Deming

Antioch University Dissertations & Theses

Wood turtles occupy cold, low-gradient riverine habitat throughout the northeastern United State and southeastern Canada. Stream alterations, such as dams, channel straightening, and floodplain development have diminished the natural hydrologic and sedimentation regimes that result in complex channel and floodplain geomorphology. Studies throughout the species’ range have quantified many aspects of their habitat, but none have quantified components of geomorphology of wood turtle sites. The goal of this study was to explore the role of stream channel and floodplain geomorphology in wood turtle habitat use, with specific objectives to (1) quantify components of stream channel and floodplain geomorphic complexity, (2) …

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Assessing Arbuscular Mycorrhizal Fungal Community Composition And Diversity Across A Land-Use Gradient In Eastern Washington Prairies, Katherine I. Cole Jan 2025

Assessing Arbuscular Mycorrhizal Fungal Community Composition And Diversity Across A Land-Use Gradient In Eastern Washington Prairies, Katherine I. Cole

EWU Masters Thesis Collection

Arbuscular mycorrhizal fungi (AMF) are key to healthy, functioning terrestrial ecosystems worldwide. Associating with over 80% of all extant land plants, they play a pivotal role in nutrient cycling, and contribute to overall plant health. Given their significance to terrestrial ecosystems, AMF have a crucial role to play in the successful restoration of Eastern Washington’s native prairies. However, AMF community composition is significantly altered by the commercial agricultural practices used extensively in this region for over 100 years. The Eastern Washington University (EWU) Prairie Restoration Project aims to restore ~120 acres of farmland to native prairie. This research provides insight …

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Tree Crown Economics Of Broadleaf Deciduous Forests, Yiting Fan Jan 2025

Tree Crown Economics Of Broadleaf Deciduous Forests, Yiting Fan

Graduate Theses, Dissertations, and Problem Reports (ETD)

Tree crown architecture, a critical determinant of forest ecosystem processes such as photosynthesis, evapotranspiration, and spectral reflectance, is shaped by adaptive trade-offs in resource use and environmental responses. However, significant gaps remain in our understanding of how these traits vary across species, environmental gradients, and temporal scales. This dissertation addresses these gaps by employing remote sensing data across three interconnected studies. Together, these studies advance tree crown economic theory, highlighting how crown traits mediate trade-offs between light capture and water-use efficiency and how these traits influence forest responses to global change. Collectively, this dissertation offer insights for improving models that …

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Characterizing Nursery Habitat For Juvenile Invasive Carp (Hypophthalmichthys Spp.) On The Ohio River, Rebecca Hiller Jan 2025

Characterizing Nursery Habitat For Juvenile Invasive Carp (Hypophthalmichthys Spp.) On The Ohio River, Rebecca Hiller

Graduate Theses, Dissertations, and Problem Reports (ETD)

Since their introduction to US waters, Silver Carp (Hypophthalmichthys molitrix) and Bighead Carp (H. nobilis) have rapidly spread throughout the Mississippi River basin and its major tributaries, but their invasion has stalled within the Ohio River. Recent research has suggested this slowed spread could be due to a lack of suitable nursery habitat in the Ohio River, affecting recruitment of invasive carp. This study aims to characterize the habitats juvenile carp are utilizing by investigating three main lines of inquiry: that juvenile carp habitat use is limited by (1) the flow regime of the Ohio River …

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Using Advanced Machine Learning To Evaluate The Spatial And Temporal Patterns Of Human–Bear Interactions In Maryland, Usa, Katherine A. Kurth, Jonathan K. Trudeau Jan 2025

Using Advanced Machine Learning To Evaluate The Spatial And Temporal Patterns Of Human–Bear Interactions In Maryland, Usa, Katherine A. Kurth, Jonathan K. Trudeau

Human–Wildlife Interactions

American black bears (Ursus americanus) are highly adaptable to human-dominated areas, which can lead to interactions with humans. Managing these interactions is a priority for many wildlife agencies in North America. Climate-induced shortages in natural food can exacerbate human–bear interactions, as bears are driven to seek alternative food sources in human-dominated areas. However, few studies have investigated the impact of climate or weather on the frequency and severity of human–bear interactions. In Maryland, USA, no research has examined the anthropogenic or environmental factors contributing to human–bear interactions, even though reported interactions have consistently increased since the 1990s. Our …

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The Seasonality And Community Composition Of Mosquitoes At Turnbull National Wildlife Refuge, Jonathan Becerra Jan 2025

The Seasonality And Community Composition Of Mosquitoes At Turnbull National Wildlife Refuge, Jonathan Becerra

EWU Masters Thesis Collection

Characterizing mosquito species composition and seasonal dynamics is fundamental to understanding how mosquito communities change across time and space. This study examined the structure, temporal patterns, and spatial variation of the mosquito community at Turnbull National Wildlife Refuge (TNWR) using three years of CDC light-trap data (2017–2019). We applied multiple complementary analytical approaches—including presence/absence and CPUE models, annual and species-specific generalized additive models (GAMs), peak-timing ANOVA, and multivariate analyses (NMDS, PERMANOVA, and indicator species analysis)—to quantify species-level seasonality, phenological staggering, and community-level patterns across years and between two sampling locations (Gate and Headquarters). Across all model families, species identity and …

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The Δ¹³C Signature Of Dissolved Organic And Inorganic Carbon Reveals Complex Carbon Transformations Within A Salt Marsh, Meagan J. Eagle, Kevin D. Kroeger, John W. Pohlman, Joseph J. Tamborski, Zhaohui Aleck Wang, T. W. Brooks, Jennifer O. Keefe Suttles, Adrian Mann Jan 2025

The Δ¹³C Signature Of Dissolved Organic And Inorganic Carbon Reveals Complex Carbon Transformations Within A Salt Marsh, Meagan J. Eagle, Kevin D. Kroeger, John W. Pohlman, Joseph J. Tamborski, Zhaohui Aleck Wang, T. W. Brooks, Jennifer O. Keefe Suttles, Adrian Mann

OES Faculty Publications

Coastal wetlands have high rates of atmospheric CO₂ uptake, which is subsequently respired back to the atmosphere, stored as organic matter within flooded, anoxic soils, or exported to the coastal ocean. Transformation of fixed carbon occurs through a variety of subsurface aerobic and anaerobic microbial processes, and results in a large inventory of dissolved carbon. Carbon source and the roles of aerobic respiration, sulfate reduction, and methane cycling were evaluated within salt marsh peat and the underlying sandy subterranean estuary. There is a large increase in dissolved inorganic carbon (DIC, 7,350 ± 3,900 μmol L-¹), dissolved organic carbon …

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A Century Of Sediment Metal Contamination Of Mar Menor, Europe's Largest Saltwater Lagoon, Irene Alorda-Montiel, Valentí Rodellas, Ariane Arias-Ortiz, Albert Palanques, Andrea G. Bravo, Júlia Rodriguez-Puig, Aaron Alorda-Kleinglass, Carlos Green-Ruiz, Marc Diego-Feliu, Pere Masqué, Javier Gilabert, Jordi Garcia-Orellana Jan 2025

A Century Of Sediment Metal Contamination Of Mar Menor, Europe's Largest Saltwater Lagoon, Irene Alorda-Montiel, Valentí Rodellas, Ariane Arias-Ortiz, Albert Palanques, Andrea G. Bravo, Júlia Rodriguez-Puig, Aaron Alorda-Kleinglass, Carlos Green-Ruiz, Marc Diego-Feliu, Pere Masqué, Javier Gilabert, Jordi Garcia-Orellana

OES Faculty Publications

Coastal enclosed ecosystems, such as lagoons, are vulnerable to anthropogenic impacts because they favor the accumulation of contaminants from the surrounding watersheds, particularly in their sediments. Europe's largest saltwater lagoon, the Mar Menor (SE, Iberian Peninsula), is a highly impacted ecosystem and the first in the continent to be granted personhood rights. Based on a high-resolution spatial and temporal dataset, we present the historical reconstruction of metal contamination in this ecosystem during the last century. Our results highlight that sediment metal contamination has been mainly driven by the development of the mining industry in the nearby Sierra Minera de Cartagena-La …

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Quantifying Ecological Processes Predicting Barren-Ground Caribou (Ɂetthën; Rangifer Tarandus Groenlandicus) Occurrence Across A Heterogenous Northern Indigenous Protected And Conserved Area., Eric Jolin Jan 2025

Quantifying Ecological Processes Predicting Barren-Ground Caribou (Ɂetthën; Rangifer Tarandus Groenlandicus) Occurrence Across A Heterogenous Northern Indigenous Protected And Conserved Area., Eric Jolin

Theses and Dissertations (Comprehensive)

Northern ecosystems are experiencing a period of rapid and unprecedented change, with implications for species distributions, mammal community dynamics, and habitat associations. Understanding the ecological processes that shape species distributions is crucial for developing effective conservation strategies that can adapt to such change. This study examines drivers of barren-ground caribou occurrence, a species of cultural and ecological significance, across Thaıdene Nëné Indigenous Protected Area, an ecologically intact landscape of high habitat heterogeneity straddling the treeline of the Northwest Territories. I use spatial and temporal variation in caribou detections generated by camera traps to test the relative importance of apparent competition, …

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Timing Of Migration And Seasonal Movements Of Arctic Grayling (Thymallus Arcticus) In Relation To Water Temperature In The Kakisa River And Upper Mackenzie River, Nwt: Results From An Acoustic Telemetry Study., Levi Snook Jan 2025

Timing Of Migration And Seasonal Movements Of Arctic Grayling (Thymallus Arcticus) In Relation To Water Temperature In The Kakisa River And Upper Mackenzie River, Nwt: Results From An Acoustic Telemetry Study., Levi Snook

Theses and Dissertations (Comprehensive)

Arctic grayling (Thymallus arcticus) are a cold-water salmonid that inhabit waterbodies throughout the circumpolar regions of the northern hemisphere. In the last decade, Ka'a'gee Tu First Nation members as well as local sport fishers, have observed lower catches of Arctic grayling during their annual spawning run in the Kakisa River, NWT. Many potential causes of this decline have been hypothesized including climate change and over harvesting. Outside of the general annual spawning activity in the headwaters of the Kakisa River, the ecology of the population, including post-spawn habitat use and migratory patterns, remained understudied. To address these knowledge gaps, acoustic …

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Just Keep Swimming: Outmigration Survival Of Upper Klamath Basin Juvenile Chinook Salmon, James M. Whelan Jan 2025

Just Keep Swimming: Outmigration Survival Of Upper Klamath Basin Juvenile Chinook Salmon, James M. Whelan

Cal Poly Humboldt theses and projects

The removal of four impassable hydroelectric dams on the Klamath River provides salmonids with the opportunity to recolonize their historic range in the upper Klamath River watershed. However, successful reestablishment of salmon populations requires juvenile salmon born in Oregon's upper tributaries to safely migrate downstream through the river's upper reaches. This stretch of the Klamath River, immediately downstream of Upper Klamath Lake, presents multiple migration challenges, including two flow-control dams not scheduled for removal (Link River Dam and Keno Dam), significant water diversions, and water quality issues. To evaluate these challenges, I conducted experimental releases of radio-tagged juvenile Chinook salmon …

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Variation In The Timing And Duration Of Rough-Skinned Newt (Taricha Granulosa) Larval Period In The Center Of Their Geographic Range (Humboldt County, California), Emmery R. Parker Jan 2025

Variation In The Timing And Duration Of Rough-Skinned Newt (Taricha Granulosa) Larval Period In The Center Of Their Geographic Range (Humboldt County, California), Emmery R. Parker

Cal Poly Humboldt theses and projects

Rough-skinned newts (Taricha granulosa) occur along the Pacific coast of the U.S. from central California to southwestern Alaska at elevations from zero to 2,800 m. Across that range, the timing and duration of various life history events (i.e., hatching, metamorphosis, breeding, and oviposition) are largely unknown, although general trends have been observed in a few locales. Larval life stages are particularly important for determining amphibian population persistence, but there have been no formal studies describing the larval period of rough-skinned newts. Using minnow-trap and dip net surveys at nine lentic sites in northern Humboldt County, California (elevations 400 …

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Seasonal Occupancy Of The Thermal Plume Of A Spring Tributary To The South Fork Roanoke River, Virginia., Steven L. Powers, Michael M. Calvert, Charlotte M. Spaulding Dec 2024

Seasonal Occupancy Of The Thermal Plume Of A Spring Tributary To The South Fork Roanoke River, Virginia., Steven L. Powers, Michael M. Calvert, Charlotte M. Spaulding

Southeastern Fishes Council Proceedings

Detection of temperate stream fishes varies widely across seasons as streams teeming with life in summer often appear empty during winter sampling efforts. While much literature documents the disproportionate use of the thermal plumes of spring tributaries by cold water fishes during summer, few studies have investigated occupancy of those habitats by warm water fishes in winter. We conducted quantitative snorkeling observations within the near uniform temperatures (10-14oC) of the thermal plume of a spring tributary to the South Fork Roanoke River across seasons and compared number of fishes observed and species richness to control observations made just …

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Co2 In Flowing Freshwaters: Macro Scale Database Compilation, Addressing Ph Bias In Co2 Estimates, And Quantifying Cross-Scale Interactions, Timothy R. Toavs Dec 2024

Co2 In Flowing Freshwaters: Macro Scale Database Compilation, Addressing Ph Bias In Co2 Estimates, And Quantifying Cross-Scale Interactions, Timothy R. Toavs

LSU Doctoral Dissertations

This dissertation focuses on carbon dioxide (CO2) dynamics in flowing freshwaters, contributing to the growing body of knowledge about inland water carbon cycles. The research is structured into three main chapters, each progressing towards the objective of utilizing variability in flowing freshwaters to further understand carbon dynamics, anthropogenic land cover impacts, and potential impacts from a changing climate. Chapter one compiles a 30-year dataset of pCO2 measurements from flowing freshwater systems across the contiguous United States. This dataset, referred to as CDFLOW, includes over 750,000 pCO2 estimates from more than 35,000 locations. It serves …

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