NDLTD logo NDLTD Union Catalog and Global ETD Search

Global ETD Search

Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

Results

Showing 1 to 20 of 36 for “"taxa richness"”.

  1. Environmental Factors Determining the Pre-Restoration Benthic Macroinvertebrate Assemblage In A Stream Used By Cattle

    Willey, Katherine TaraVirginia Tech2008

    … Benthic macroinvertebrate densities and taxa richness were greater at BR (total density for combined seasons = 52,438; taxa richness for both seasons = 84) than MU (total density for combined seasons = 3,982 and taxa richness for both seasons = 63). Biological environmental variables …

    vt Repository record

  2. Sample Collection and DNA Extraction Methods for Environmental DNA Metabarcoding in Headwater Streams

    Mullins, Michael TristonEastern Kentucky University

    … may be able supplement insight to local taxa richness. With the advent of high throughput sequencing and the proliferation of sequence data in public repositories, insights to the biodiversity of communities at the molecular level have been possible. Thus, this study compared commonly …

    eku Repository record

  3. Non-target effects of extended-release LongRange eprinomectin on coprophilous insects

    Backmeyer, Sydney J.Lethbridge, Alta. : University of Lethbridge, Dept. of Biology2022

    … at levels sufficient to reduce survival of some taxa with detectable effects on total insect abundance, taxa richness, and diversity. Using pitfall traps baited with dung with and without LR residues, I detected an effect of residues on attraction of some species of insects to dung. Results …

    lethbridge Repository record

  4. Effects of sediment upon benthic macroinvertebrates in forested northern Appalachian streams

    Kaller, Michael Douglas2019

    … fine sediment experiments revealed EPT taxa richness and % climber to be sensitive to increasing proportions of fine sediment. The stream surveys identified significant declines (p < 0.0001) in EPT taxa richness occurring when fine sediment exceeded approximately 1% of the substrate …

    wvu Repository record

  5. Ecology of benthic macroinvertebrates in experimental ponds

    Christman, Van D.Virginia Tech1991

    I studied life history parameters of 5 taxa of aquatic insects in the orders Ephemeroptera and Odonata, successional patterns over 2 years of pond development, and precision of 15 biological metrics in a series of 6 replicate experimental ponds from March 1989 to April 1990. I determined voltinism, …

    vt Repository record

  6. Chironomid (Diptera: Chironomidae) Larvae as Indicators of Water Quality in Irondequoit Creek, NY

    Cook, George E.1998

    … watershed. Differences in Simpson's diversity, taxa richness, and chironomid abundance were assessed in upper, middle, and lower creek locations to determine changes as the creek passes through increasingly populated areas. Differences in the same measures also were assessed in vegetation, mud, …

    brockport Repository record

  7. Phytoplankton colonization and seasonal succession in new experimental ponds

    Rosenzweig, Michael S.Virginia Tech1990

    … during the first year after filling. Taxa richness and densities, biomass as chlorophyll a, and primary productivity (in situ oxygen method) were measured. In addition, water quality data were collected and analyzed. The dominant taxonomic groups were the Cyanophyceae, Chlorophyceae …

    vt Repository record

  8. Effects of watershed land use on the benthic macroinvertebrate assemblages in ridge and valley streams in Chattanooga, Tennessee

    Freeman, Paul Leiper1999

    … assemblages including the total number of taxa (richness), and the number of families of insects belonging to the orders Ephemeroptera, Plecoptera, and Trichoptera (EPT taxa richness). Qualitative sampling efforts collected 76 family level taxa with individual sites ranging from 21 to 41 …

    utc Repository record

  9. Biological Diversity of Natural and Created Wetlands in Three Physiographic Regions of South Dakota

    Roush, K. Dawn

    … wetlands were comparable in diversity and richness with natural wetlands. Aquatic invertebrate diversity in created and natural wetlands were similar. Among physiographic regions, diversity of aquatic invertebrates was highest in the MC. These wetlands were seasonal; whereas, all other …

    sdstate Repository record

  10. Larval Fish Assemblages of Three Eastern South Dakota Rivers

    Howell, Jessica M.

    … that hydrology played an important role in both taxa richness and abundance. There was high taxa richness but low abundances of larval fish in pre-flood drought years (2003 and 2004), low richness and abundances in the flood year (2010), and low richness but high abundances in the postflood …

    sdstate Repository record

  11. Impacts of trace metal pollution, urbanization and aquifer recharge on Spokane River macroinvertebrates

    Connelly, Carolyn K

    … The downstream reach had the highest family taxa richness (p=0.01), EPT taxa richness (p=0.001) and proportion Trichoptera (p=0.01). These results supported the hypothesis that metal effects would decrease with distance downstream from the source, the Lake Coeur d’Alene basin, indicating that …

    eastern-wash Repository record

  12. Relationships Among Aquatic Macroinvertebrates, Endangered Waterbirds, and Macrophytes in Taro Lo'I At Hanalei National Wildlife Refuge, Kauai, Hawaii

    Gutscher-Chutz, Jennifer Leigh

    … snails) were the most prolific invertebrate taxa among taro loi in sweep net samples in 2005. Freshly flooded loi during and recently after planting are dominated by chironomids and oligochaetes, shifting to snails and then other insects as the taro crop matures. Invertebrate taxa richness in …

    sdstate Repository record

  13. Effects of Stream Crossings on Macroinvertebrate Assemblages of the Upper Current River, Ozark National Scenic Riverways, Missouri

    Heth, Rachel Lee Sine

    … of 68,353 individuals from 111 macroinvertebrate taxa, I calculated four metrics (taxa richness, Shannon's index, EPT, biotic index) combined into the Stream Condition Index and assessed effects of stream crossings with a two-way nested ANOVA for each season. All metrics showed strong differences …

    mo-state Repository record

  14. Infaunal Abundance and Diversity in Vegetated and Unvegetated Areas of a Georgia Salt Marsh

    Zukoff, Anthony Lee2013

    … from each quadrat at low tide during 3 months. Taxa richness and diversity was described at each site to determine if unvegetated areas at each site displayed lower infaunal abundance and diversity. The effects of the absence of vegetation varied between sites and across sampling months. There …

    gsu Repository record

  15. EPIBENTHIC INVERTEBRATES AND JUVENILE CHUM SALMON (ONCORHYNCHUS KETA) PREY AVAILABILITY ALONG AN ECO-ENGINEERED SHORELINE: A CASE STUDY AT THE SEAWALL IN SEATTLE, WASHINGTON

    Oxborrow, Bob2022

    … and bench) with higher relative densities and taxa richness outside piers and on the bench. Total epibenthic invertebrate densities and densities of juvenile chum salmon prey were higher on the bench positioned outside piers than on all other eco-engineered strata (the marine bench under piers, …

    washington Repository record

  16. FACTORS CONTROLLING NICKEL BIOAVAILABILITY AND EFFECTS ON BENTHIC INVERTEBRATES IN HARDWATER FRESHWATER STREAMS

    Custer, Kevin WayneWright State University2012

    … benthic communities (Ephemeroptera, abundance, taxa richness) responded negatively to increasing SEM<sub>Ni</sub>/AVS and (SEM<sub>Ni</sub>-AVS)/ƒoc models (increasing Ni bioavailability), and these communities demonstrated a sediment type preference. During a Ni-sediment flow-thru study, Ni …

    ohiolink Repository record

  17. Macroinvertebrate Biomonitoring Criteria and Community Composition in Seasonal Floodplain Wetlands of the Upper Missouri River

    Haugerud, Neil J.

    … predators, 4) proportional abundance of dominant taxa, 5) proportional biomass of Hydraenidae 6) proportional biomass of univoltine taxa and 7) number of Odonata taxa. These metrics were then scored from 0-10 (high scores indicated similarity to the reference condition), summed and standardized …

    sdstate Repository record

  18. Avian and Aquatic Invertebrate Abundance on Three Agricultural Management Systems in Eastern South Dakota

    Kirschenmann, Thomas R.

    … wetlands on the CON farming system. Species richness was typically higher on the ORG system for individual wetland classes and when all wetland classes were combined. Thirty-six waterfowl broods were counted on the 3 farming systems between both sampling years, however only 5 of these were …

    sdstate Repository record

  19. ANALYSIS OF MICROBIOME IN VARIOUS HUMAN MEDICAL CONDITIONS USING NEXT-GENERATION SEQUENCING OF THE 16S rRNA GENE

    Sharma, Pallavi2024

    … landscape, identifying over 338 bacterial taxa. Notably, <em>Acinetobacter</em>, <em>Cutibacterium</em>, <em>Acidovorax</em> and <em>Herbaspirillum</em> were prevalent in the ocular samples and<em> Akkermansia, Faecalibacterium, </em>and <em>Anaerostipes</em> were mostly prevalent in gut …

    sfasu Repository record

  20. Land use influences on benthic invertebrate assemblages in southern Appalachian agricultural streams

    Bennett, Barbara LoraineVirginia Tech1998

    … temperatures than FA streams. Total and EPT taxa richness was greater in FA streams. Pollution-sensitive Plecoptera were relatively more abundant in FA streams, while tolerant Diptera were more abundant in CA streams. High diversity and Plecoptera abundance was related to high habitat …

    vt Repository record

Page 1 of 2