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Articles 1 - 30 of 668
Full-Text Articles in Fresh Water Studies
Patterns In Winter Stonefly Distribution Along A River Continuum And Land-Use Gradient In Northwest Arkansas Streams, Zachary Tipton
Patterns In Winter Stonefly Distribution Along A River Continuum And Land-Use Gradient In Northwest Arkansas Streams, Zachary Tipton
Graduate Theses and Dissertations
Freshwater ecosystems are facing a crisis with extinction rates of aquatic species exceeding those of their terrestrial counterparts by up to fivefold. This decline is predominantly attributed to evolving land use patterns within watersheds, leading to chemical and physical transformations in freshwater habitats. Northwest Arkansas (NWA) represents one of the fastest-growing regions in the United States, undergoing substantial shifts in land use. Consequently, the status of aquatic life in this region remains uncertain. Addressing this concern, the latest Arkansas Wildlife Action Plan emphasizes the necessity of distribution and population data to guide conservation efforts for Species of Greatest Conservation Need …
Mixing Regimes In A Cluster Of Seven Maar Lakes In Tropical Monsoon Asia, Milette U. Mendoza, Jaydan I. Aguilar, Karol Sophia Agape R. Padilla, Rey Donne S. Papa, Noboru Okuda
Mixing Regimes In A Cluster Of Seven Maar Lakes In Tropical Monsoon Asia, Milette U. Mendoza, Jaydan I. Aguilar, Karol Sophia Agape R. Padilla, Rey Donne S. Papa, Noboru Okuda
Environmental Science Faculty Publications
The 7 maar lakes of San Pablo are a cluster of small volcanic lakes on Luzon Island; Philippines. These lakes; which are heavily utilized for aquaculture and ecotourism; usually experience fish kills that coincide with the northeast monsoon (NEM). This study explores limnophysical processes; particularly mixing regimes; in the lakes in relation to prevailing monsoons. We monitored monthly vertical and seasonal profiles of water temperature; salinity; conductivity; and dissolved oxygen from October 2016 to December 2018. Three types of mixing regimes were observed among the lakes; which have similar surface areas but different depths: polymixis in the shallowest; warm monomixis …
How Flow Regime Affects Predator-Prey Relationships Of Stream Darter And Shiner Species, Anna E. Richardson
How Flow Regime Affects Predator-Prey Relationships Of Stream Darter And Shiner Species, Anna E. Richardson
Biological Sciences Undergraduate Honors Theses
Analysis of the interactions between abiotic and biotic factors of environments and ecosystems is a highly valued area of research. This study focuses on the interactions between the biotic component of predation and foraging of certain stream fish species and the abiotic component of the flow regime that those species reside in. Gut content analysis followed by statistical calculations in the form of t-tests and chi -quared tests were performed on two fish species who both inhabited a stream with a groundwater flashy flow regime as well as a stream with a runoff flashy flow regime. The research showed that …
Analysis Of Edna To Assess Effects Of Water Quality On Freshwater Fungal Diversity In A Virginia Coastal Watershed, Lauren French
Analysis Of Edna To Assess Effects Of Water Quality On Freshwater Fungal Diversity In A Virginia Coastal Watershed, Lauren French
Undergraduate Honors Theses
Freshwater fungi comprise a phylogenetically and functionally diverse group which contributes to wide-ranging ecosystem processes in aquatic systems. Saprotrophic fungi convert detritus into nutrient-rich food sources for fish and invertebrates, whereas pathogenic and parasitic fungi can cause disease and population declines of other aquatic organisms. With their diverse and important roles, changes in freshwater fungal community structure may have far-reaching impacts on ecosystems. To understand how natural and anthropogenic stressors to freshwater systems impact fungal-mediated ecosystem processes, a greater understanding of the taxonomic and functional composition of freshwater fungal communities is needed. We assessed relationships among freshwater habitat types, water …
Drivers Of Extracellular Polysaccharide Production By A Mat-Forming Diatom, Kaitlin A. Stansbury
Drivers Of Extracellular Polysaccharide Production By A Mat-Forming Diatom, Kaitlin A. Stansbury
FIU Electronic Theses and Dissertations
Microbial biofilms are held together by extracellular polymeric substances (EPS), which can be secreted by many organisms. EPS production can facilitate intercellular communication and inter-guild microbial mutualisms, intraspecific gamete exchange, nutrient sequestration, and desiccation resistance. Benthic microbial mats (periphyton) of the Florida Everglades and other karstic wetlands contain abundant EPS generated by mat-producing filamentous blue-green algae and many other species of mat-dwelling algae, cyanobacteria, and bacteria, including the most abundant Everglades diatom, Mastagloia calcarea. The benthic diatom genus Mastogloia is characterized by several morphological and physiological features that foster production of a ‘halo’ of EPS around the frustule, but the …
2021 Assessment Of The Status Of The West Coast Demersal Scalefifish Resource, David Fairclough, E. A. Fisher, Sybrand Alex Hesp, Ainslie Denham, Rachel Marks
2021 Assessment Of The Status Of The West Coast Demersal Scalefifish Resource, David Fairclough, E. A. Fisher, Sybrand Alex Hesp, Ainslie Denham, Rachel Marks
Fisheries research reports
No abstract provided.
Ecological Risk Assessment For The Temperate Demersal Elasmobranch Resource, Department Of Primary Industries And Regional Development, Western Australia
Ecological Risk Assessment For The Temperate Demersal Elasmobranch Resource, Department Of Primary Industries And Regional Development, Western Australia
Fisheries research reports
No abstract provided.
Squid And Cuttlefish Resources Of Western Australia, Daniel Yeoh, Danielle J. Johnston Phd, David C. Harris
Squid And Cuttlefish Resources Of Western Australia, Daniel Yeoh, Danielle J. Johnston Phd, David C. Harris
Fisheries research reports
No abstract provided.
Otoliths Of South-Western Australian Fish: A Photographic Catalogue, Chris Dowling, Kim Smith, Elain Lek, Joshua Brown
Otoliths Of South-Western Australian Fish: A Photographic Catalogue, Chris Dowling, Kim Smith, Elain Lek, Joshua Brown
Fisheries research reports
No abstract provided.
Plant Community Response To The Combined Effects Of Elevation, And Simulated Nutrient And Sediment Loading In Sagittaria Lancifolia-Dominated Wetlands, Donnie Day
LSU Master's Theses
Coastal wetlands are experiencing threats to their long-term sustainability brought about by the combined effects of relative sea-level rise and human modifications to hydrology, sediment delivery and nutrient loading. Restoration and management strategies can include adding sediment to the surface of deteriorating marshes to facilitate positive feedbacks among elevation, plant productivity, sediment trapping, and accretion; however, if delivered using nitrate-enriched river waters, belowground biomass and soil organic matter pools may be negatively affected, resulting in the acceleration of wetland loss. Overall, there is limited information on the combined effects of nutrient loading, sedimentation, and flooding dynamics in regulating feedbacks among …
Aquatic Macrophyte Communities In Five Sibley County (Minnesota) Lakes And The Factors That Affect Their Distribution, Samuel A. Schmid
Aquatic Macrophyte Communities In Five Sibley County (Minnesota) Lakes And The Factors That Affect Their Distribution, Samuel A. Schmid
All Graduate Theses, Dissertations, and Other Capstone Projects
The purposes of this study are to 1) quantify the shifts in the macrophyte community structure of five lakes in Sibley County, and 2) to assess the relationships between the macrophyte communities and abiotic factors in these five lakes. In both the early and late growing season of 2019, point-intercept surveys were conducted on High Island Lake, Titlow Lake, Schilling Lake, Silver Lake, and Clear Lake. At each point, water depth was recorded, and all macrophytes sampled were identified and recorded as “present.” There was not a late season survey conducted for High Island Lake in 2019 due to a …
Paleoenvironmental Reconstruction Of Quaternary Saltville, Virginia, Using Ostracode Autecology, Austin Gause
Paleoenvironmental Reconstruction Of Quaternary Saltville, Virginia, Using Ostracode Autecology, Austin Gause
Electronic Theses and Dissertations
The Saltville valley in southwestern Virginia is home to Quaternary localities containing paleontological and archaeological remains. Historically the valley has been mined for salt and the small lakes, ponds and springs along the valley floor have a brackish signature. A preliminary report on the site’s ostracode fauna suggested that the site’s water was not always saline. This study analyzed modern and Quaternary ostracodes to understand the valley’s hydrologic and chemical evolution. Sediments contained primarily freshwater species, including the environmentally sensitive Candona crogmaniana. The presence of Pelocypris tuberculatum and a new Fabaeformiscandona species throughout a vertical section spanning the latest Pleistocene …
A Framework For Aquatic Invasive Species Surveillance Site Selection And Prioritization In The Us Waters Of The Laurentian Great Lakes, Andrew J. Tucker, W. Lindsay Chadderton, Gust Annis, Alisha D. Davidson, Joel Hoffman, Jon Bossenbroek, Stephen Hensler, Michael Hoff, Erika Jensen, Donna R. Kashian, Sarah Lesage, Timothy Strakosh
A Framework For Aquatic Invasive Species Surveillance Site Selection And Prioritization In The Us Waters Of The Laurentian Great Lakes, Andrew J. Tucker, W. Lindsay Chadderton, Gust Annis, Alisha D. Davidson, Joel Hoffman, Jon Bossenbroek, Stephen Hensler, Michael Hoff, Erika Jensen, Donna R. Kashian, Sarah Lesage, Timothy Strakosh
Environmental Science and Geology Faculty Research Publications
Risk-based prioritization for early detection monitoring is of utmost importance to prevent and mitigate invasive species impacts and is especially needed for large ecosystems where management resources are not sufficient to survey all locations susceptible to invasion. In this paper we describe a spatially-explicit and quantitative approach for identifying the highest risk sites for aquatic invasive species (AIS) introduction into the United States’ waters of the Laurentian Great Lakes, a vast inland sea with a surface area of 246,049 square km and a shoreline length of 16,431 km. We compiled data from geospatial metrics available across all of the US …
Assessing The Legacy Of Large Woody Debris As Coastal Protection In Bc And Washington, Jessica Wilson
Assessing The Legacy Of Large Woody Debris As Coastal Protection In Bc And Washington, Jessica Wilson
Salish Sea Ecosystem Conference
Large Woody Debris (LWD) accumulates naturally in the coastal environment (Brennan et al., 2009; Sass, 2009) and is thought to be a vital component of a diverse coastal habitat ( Rich et al., 2014). Decreasing natural coverage of LWD (Heathfield & Walker, 2011) and increasing demand for environmentally sensitive coastal protection techniques has led to the promotion of LWD as a viable nature-based method of shoreline protection (e.g. Johannessen et al., 2014; Stewardship Centre for BC, 2016; Washington Department of Fish and Wildlife, 2016). However, there is currently no peer-reviewed literature assessing the efficacy of coastal protection using LWD. This …
Northern Kelp Crab (Pugettia Producta) Feeding Preferences - Kelp Crabs Eat Kelp, And Lots Else?, Katie Dobkowski
Northern Kelp Crab (Pugettia Producta) Feeding Preferences - Kelp Crabs Eat Kelp, And Lots Else?, Katie Dobkowski
Salish Sea Ecosystem Conference
Bull kelp (Nereocystis luetkeana) is an important source of both habitat and primary production in the Salish Sea and appears to be in decline in certain areas. Northern Kelp Crabs (Pugettia producta) are large crustacean consumers that preferentially consume N. luetkeana over other local seaweed species in laboratory feeding trials and exert some level of top-down control on kelp populations in the field. We have observed differences in kelp crab density around the Salish Sea and noted P. producta living on invasive wireweed (Sargassum muticum) as well as on kelp and in other habitats. We used a combination of laboratory …
Strategizing For Workplace Culture: Developing And Introducing A Diversity, Equity, And Inclusion Road Map, Melissa Watkinson
Strategizing For Workplace Culture: Developing And Introducing A Diversity, Equity, And Inclusion Road Map, Melissa Watkinson
Salish Sea Ecosystem Conference
Organizations are familiar with developing a strategic plan to focus their work on achieving their mission and vision. A diversity, equity, and inclusion (DEI) road map, aligned with organizational values of DEI, is a strategic plan that defines DEI in your work: where you are starting, where you want to end up, and how you are going to get there. Washington Sea Grant (WSG) has developed a 10-year road map that includes 13 ambitious, but achievable goals that are aligned with tangible strategies and expected outcomes. The road map goals range in specificity; examples include “WSG is welcome and inclusive” …
A Journey, Not A Destination: An Agency Approach To Incorporate Diversity, Equity, Inclusion, And Justice, Alexandra Doty
A Journey, Not A Destination: An Agency Approach To Incorporate Diversity, Equity, Inclusion, And Justice, Alexandra Doty
Salish Sea Ecosystem Conference
Puget Sound environmental recovery is a complex, wicked problem, including both ecosystem and human and cultural wellbeing. The Puget Sound Partnership (Partnership) is a small Washington State agency that serves as a backbone organization guiding Puget Sound recovery, coordinating and collaborating with hundreds of partner organizations to accelerate recovery of Puget Sound. Our partner organizations include state and federal agencies, tribes, cities, counties, non-profits, academic institutions, special purpose districts, and many others. In 2018, the Partnership began a journey to better enable and foster diversity, equity, inclusion, and justice within the agency itself, as well as within the Puget Sound …
Begin At The Beginning: Steps, Stumbles And Learnings On The Path To Understanding And Implementing Dei Practices In Regional Engo., Christianne Wilhelmson
Begin At The Beginning: Steps, Stumbles And Learnings On The Path To Understanding And Implementing Dei Practices In Regional Engo., Christianne Wilhelmson
Salish Sea Ecosystem Conference
In 2018, Georgia Strait Alliance made the decision to begin the journey of addressing the complex issue of diversity, equity and inclusion (DEI) in our organization, one that like many environmental groups in BC lacks diversity in its staff and board. We prioritized this as we recognized there is an inherent risk that our work and our organization could become irrelevant if we don’t represent the communities we claim to serve. In addition to diversity, we also needed to address the need to deepen our relationships with indigenous communities in the Georgia Strait region and reflect those relationships in our …
Reconstructing A Century Of Coastal Productivity And Predator Trophic Position In The Salish Sea Using Archival Harbor Seal Bone., Megan Feddern
Reconstructing A Century Of Coastal Productivity And Predator Trophic Position In The Salish Sea Using Archival Harbor Seal Bone., Megan Feddern
Salish Sea Ecosystem Conference
Following the passage of the Marine Mammal Protection Act of 1972, pinniped populations along the west coast of North America experienced exponential population increases following historic lows in the 1970's. In the Salish Sea, this increase in pinniped abundance also corresponded to large scale changes environmental condition (ie. Pacific Decadal Oscillation; PDO) and declines of prey species (forage fish, salmon), creating new challenges and tradeoffs for fisheries management in the region. The objective of this research is to understand how an abundant top predator, harbor seals, respond to bottom up forces in the system such as shifts in primary productivity …
Shifting Phenology Of An Apex/Specialist Predator Tracks Changes In Its Favored Prey, Ailene Ettinger
Shifting Phenology Of An Apex/Specialist Predator Tracks Changes In Its Favored Prey, Ailene Ettinger
Salish Sea Ecosystem Conference
Phenology, or the timing of biological activities such as migration, growth, and reproduction, can have dramatic implications for fitness; consumer phenology that is out of step with its resource phenology can cause increased mortality or reduced reproductive success. The timing of southern resident killer whale (SRKW, Orcinus orca) movements in the Salish Sea is thought to be related to seasonal migrations of their prey. In recent decades, the abundance and phenology of the favored prey of SRKWs, salmon, has shifted in many locations across the western United States. Here, we use the OrcaMaster Database to quantify seasonal variation in SRKW …
Sources, Sinks, Dispersion And Cycling Of Dissolved Polybrominated Diphenyl Ethers (Pbdes) Discharged In The Strait Of Georgia, Yuanji Sun
Salish Sea Ecosystem Conference
The temporal and spatial distribution of dissolved PBDE concentration in the Strait of Georgia (SoG) is combined with concentrations predicted from a time-dependent box model of the Salish Sea to investigate the sources, sinks, dispersion and cycling of PBDE congeners. Prominent sub-surface concentration maxima (up to ca. 400 pg/L for total PBDE) occasionally measured in the southern SoG point to the Iona Island Waste Water Treatment Plant diffusers, discharging primary-treated effluent at 72 - 106 m depth, as an important proximal point source of dissolved PBDE. The decreasing depth of concentration maximum with increasing congener bromination suggests that dissolved PBDEs …
Harbor Porpoises (Phocoena Phocoena Vomerina) Catching And Handling Large Fish On The U.S. West Coast, Katrina Maciver
Harbor Porpoises (Phocoena Phocoena Vomerina) Catching And Handling Large Fish On The U.S. West Coast, Katrina Maciver
Salish Sea Ecosystem Conference
The harbor porpoise is a cryptic species, and information on their behavior is limited. This study describes the chase and capture of large fish by harbor porpoises (Phocoena phocoena vomerina) in the Salish Sea off Fidalgo Island, Washington, which were identified as salmonid species (2017/2019). Similar large fish chase/capture events of American Shad (Alosa sapidissima) have also been documented in San Francisco, CA (2016/2017). In all capture events consistent behavior was observed: the porpoise accelerated after the fish, swimming in a circle at the same spot, diving and coming out of the water head first carrying the fish cross-wise in …
Sublethal Effects Of The Sea Lice Pesticides Ivermectin And Slice® On Starry Flounder Behaviour And Physiology When Exposed To Contaminated Sediments, Daniel King
Salish Sea Ecosystem Conference
Aquaculture is an important part of Canada’s economy, and open net-pen Atlantic salmon (Salmo salar) aquaculture is a key facet of this industry. Chemotherapeutants, including anthelminthics, are often used in salmon aquaculture to prevent the loss of stock due to various pathogens. The formulation SLICE® (active ingredient: emamectin benzoate) and ivermectin (IVM) are two chemicals used in salmon aquaculture in Canada to treat and prevent sea lice infestations. SLICE® and IVM have low water solubilities and long half-lives in sediment (225 d and >100 d, respectively). Due to the persistence of these pesticides and their tendency to accumulate in marine …
Innovative Treatment Of Wood Waste Sediments Using Reactive Amendments And Dgt Passive Porewater Sulphide Testing Techniques, Daniel Berlin
Innovative Treatment Of Wood Waste Sediments Using Reactive Amendments And Dgt Passive Porewater Sulphide Testing Techniques, Daniel Berlin
Salish Sea Ecosystem Conference
Esquimalt Harbour has historically been used for log rafting, log storage and wood mill operations over the last 70 years, resulting in the accumulation of over 200 hectares of wood waste deposits. As wood waste decomposes, it creates a biological oxygen demand in sediments that can reduce or eliminate oxygenated zones. This can lead to a buildup of compounds such as sulphides and ammonia, which are toxic to benthic organisms at higher concentrations. Public Services and Procurement Canada, on behalf of the Department of National Defence, has completed studies of wood waste sediments and is currently constructing a pilot project …
Results From Biennial Mussel Watch Monitoring In Sinclair And Dyes Inlets, Puget Sound, Washington From 2010 To 2018, Robert Johnston
Results From Biennial Mussel Watch Monitoring In Sinclair And Dyes Inlets, Puget Sound, Washington From 2010 To 2018, Robert Johnston
Salish Sea Ecosystem Conference
As a component of a greater effort to assess the status and trends of ecological resources within Sinclair and Dyes Inlets, a monitoring network of mussel watch sites was initiated in winter of 2010 and has continued every-other-year through 2018. Twenty-five indigenous bivalve monitoring sites were sampled biennially for a total of five campaigns. Indigenous mussels (Mytilus spp.) were collected at sites located near suspected sources (industrial, wastewater, and storm water outfalls; marinas, stream mouths, and other sources) as well as sites that were representative of ambient conditions in Sinclair and Dyes Inlets, the adjoining passages, and Liberty Bay in …
Can Larval Dispersal Explain Differences In Population Structure Of Esa-Listed Rockfish In Puget Sound?, Kelly S. Andrews
Can Larval Dispersal Explain Differences In Population Structure Of Esa-Listed Rockfish In Puget Sound?, Kelly S. Andrews
Salish Sea Ecosystem Conference
In 2010, three species of rockfish in the Puget Sound/Georgia Basin (PSGB) region were listed under the Endangered Species Act (ESA). Subsequent genetic analyses revealed that yelloweye rockfish in PSGB were genetically differentiated from individuals on the outer coast; while canary rockfish showed no population structure among these geographic regions. These results confirmed the listing status of yelloweye rockfish in PSGB as a “distinct population segment” (DPS), but suggested that canary rockfish in PSGB were not a DPS, which led to their removal from the endangered species list. Here, we test whether larval dispersal could be a mechanism for the …
Reefs For Rockfish: A Collaborative Approach To Monitor Populations And Increase Awareness In Howe Sound., Amanda Weltman
Reefs For Rockfish: A Collaborative Approach To Monitor Populations And Increase Awareness In Howe Sound., Amanda Weltman
Salish Sea Ecosystem Conference
Artificial reefs are a conservation tool that can increase biodiversity and habitat complexity in degraded habitats around the world. In some areas, they can be effective at helping to counter stressors such as overfishing by increasing the abundance of coral and fish. In addition to providing habitat, they also provide an opportunity to engage non-scientists in monitoring projects as the public can be involved in both the design and monitoring of these artificial structures. While numerous artificial reef projects exist, many are located in warm tropical waters with limited focus on the role that artificial structures can play for fish …
Puget Sound Vital Sign Revision: Objectives For Puget Sound Recovery And Protection, Ron Thom
Puget Sound Vital Sign Revision: Objectives For Puget Sound Recovery And Protection, Ron Thom
Salish Sea Ecosystem Conference
Since the mid-1980’s, there have been focused federal, state and local efforts to restore the Puget Sound ecosystem. Beginning in 2008 the Puget Sound Partnership (PSP) has produced Action Agendas that describe comprehensive recovery programs and, since 2011, have identified a set of Vital Signs and indicators. As of 2018, PSP identified 25 Vital Signs (VS) with 52 affiliated indicators. The PSP is now undertaking a collaborative effort to revise the VS and indicators to address known concerns and to situate them in a framework of other types of progress measures. Revised VS and indicators will characterize biophysical condition and …
Seasonal Trends In Cu, Ag And Cd Content In Strait Of Georgia Zooplankton, Bertha Iselle Flores Ruiz
Seasonal Trends In Cu, Ag And Cd Content In Strait Of Georgia Zooplankton, Bertha Iselle Flores Ruiz
Salish Sea Ecosystem Conference
The temporal variations of copper (Cu), silver (Ag) and cadmium (Cd) content in the Strait of Georgia (SoG) zooplankton were measured between 2017 and 2018. We present the first values measured for these trace metals in zooplankton from this region and how they compare with values in other regions in the world. Our results suggest that there are significant seasonal trends in carbon-normalized Ag and Cu contents in zooplankton, and that these two metals tend to increase with increasing zooplankton size. Additionally, the trends on metal content in Ag –a toxic, nonessential metal– are similar to those for Cu-an essential …
Sea Cucumber (Apostichopus Californicus) Culture And Enhancement Opportunities., Andy Suhrbier
Sea Cucumber (Apostichopus Californicus) Culture And Enhancement Opportunities., Andy Suhrbier
Salish Sea Ecosystem Conference
Demand for giant red sea cucumbers (Apostichopus californicus) continues in Asian markets while wild harvest has declined on the west coast of North America. Multiple trials are in place in Washington state to culture this species on upland and floating structures that support other species. Co-culture of sea cucumbers has proved to be effective with mussels, black cod, sea weed and oysters. In addition, there are food resources from aquaculture that the wild population currently exploits but conceivably could utilize more efficiently. Efforts to further this utilization are in progress.