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Showing 1 to 19 of 19 for “"Hyalella."”.
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Effects of Various Pesticides on Hyalella Azteca
The amphipod, Hyalella azteca, was described by Saussure in 1856. Weckel (1907) discussed the synonomy of the species and credited its discovery to Bate (1862), who classified this species as Hyalella knickerbockeri. | Depending upon age and sex, this small crustacean ranges from 2 to 7 mm in …
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Espécies brasileiras do gênero Hyalella (Crustacea-Amphipoda)
A systematic is made of the species of Hyalella Smith (Crustacea-Amphipoda) based on material gathered at different points of the Brazilian territory, which is kept at the carcinological collection of the Museu Nacional, Rio de Janeiro. Six species were found, four of which (Hyalella azteca, H. …
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Genetic and life history differences among laboratory and wild populations of hyalella azteca
Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2014-06-28T10:00:27Z
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Laboratory and field studies of cadmium effects on Hyalella azteca in effluent dominated systems.
… and effects of metals. Concurrent 42-day Hyalella azteca exposures were performed with cadmium and final treated municipal effluent in the laboratory and at the University of North Texas Stream Research Facility. Further laboratory testing in reconstituted hard water was also conducted. …
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Determining The Occurrence, Fate, And Effects Of Pesticide Mixtures Using The Aquatic Amphipod Hyalella Azteca
… toxicity test with the aquatic amphipod <i>Hyalella azteca</i>. The second goal was to analyze an existing database of chemical concentrations using a toxicity-based screening approach in order to estimate the environmental hazard posed by mixtures of pyrethroid, organochlorine, and …
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Host-parasite interactions between the cysticercoid larvae of the cestode Microsomacanthus hopkinsi and the amphipod intermediate host Hyalella azteca
… hopkinsi and the amphipod intermediate host Hyalella azteca throughout the latter's life history. There was a significant positive relationship in oncosphere consumption, parasite loads, and short-term survival in amphipods exposed during Instars 1, 2, 3, 4, 6, 8 and 9. Oncosphere …
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Fate and effects of triallate in a prairie wetland
… zooplankton (Daphnia pulex) and amphipods (Hyalella azteca). Biomass of phytoplankton and periphyton was not affected by triallate. Daphnia pulex and Hyalella azteca suffered reduced body size and reproduction. However, some of the results were inconsistent among enclosures. Microcosm and …
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Can Amphipods be used to monitor mining-impacted lakes?
… study to determine whether an amphipod (Hyalella azteca) can serve as a sentinel in a mining-impacted area in Northern Idaho, the Coeur d’Alene (CDA) River Basin. My objectives in the field study were to (1) determine seasonal abundance and metal burden of amphipods in nine chain lakes …
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Quantifying the presence of current-use insecticides and toxicity of sediments in urban residential watersheds in central Texas.
… Additionally, the toxicity of these sediments to Hyalella azteca was evaluated. Sediment samples were collected from several sites in urban streams over the course of a pesticide application season. The sediments were extracted and analyzed using a Varian 2100 gas chromatograph with MS/MS for the …
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Techniques for Evaluating Power Plant Discharges Using In-Situ Breakdown and Flow Though Laboratory Sediment Bioassays
… including Chironomus tentans, Daphnia magna and Hyalella azteca for survival and growth endpoints in 10-day exposures. Survival and growth effects for Corbicula juveniles were seen at 25 ppb copper in the sediment.
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The Effects of Ultraviolet-B Radiation on Aquatic Invertebrates
… Cyprinotus incongruens, and the amphipod Hyalella azteca. Among the species, 96-h LD₅₀ estimates were quite variable, ranging from 4.2 to 84.0 μW/cm². These estimates indicated S. kingii to be highly sensitive, H. azteca, C. reticulata, and D. magna moderately sensitive, whereas the …
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Effects of a Textile Mill Effluent and a Low Water Dam on Benthic Macroinvertebrate Community Structure of the Guadalupe River in Comal County, Texas
… macroinvertebrate taxa found were dominated by Hyalella azteca (Hyalellidae), Chironomids, and Dubiraphia (Elmidae). More taxa and greater number of individuals were present downstream from the effluent than upstream at all times during the study period. The fewest taxa and individuals were …
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Aquatic community response to Zequanox®: a mesocosm experiment
… three weeks. Declines also occurred in amphipods Hyalella azteca (mean abundance 77% less than controls) and gastropods Viviparus georgianus (survival 73 ±16%), which did not recover during the experiment. Short-term impacts to water quality included a decrease in dissolved oxygen (minimum 1.2 …
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Food Habits of Young-of-the-Year Fishes in Abbey Pond, South Dakota
… on small curstaceans and immature insects. Hyalella sp. was a major food organism for young yellow bullheads of all sizes. Young-of-the-year yellow bullheads had positive electivity indices, in most cases, for Chydorus sp. and ostracods and negative indices for Caphnia ambigua, Ceriodaphnia …
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Predicting the bioavailability and toxicity of hydrophobic pesticides using bioassays and a solid phase microextraction approach
… to the midge Chironomus dilutus and the amphipod Hyalella azteca, in water and sediment exposures. Equilibrium/equilibrium-equivalent SPME fiber concentrations were related to tissue residues, and significant linear relationships were found between the parent compound in the biota and the SPME …
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FACTORS CONTROLLING NICKEL BIOAVAILABILITY AND EFFECTS ON BENTHIC INVERTEBRATES IN HARDWATER FRESHWATER STREAMS
… herricki</i>) and two surrogate organisms (<i>Hyalella azteca</i> and <i>Chironomus dilutus</i>). Of the indigenous insects, <i>A. verticis</i> and <i>Stenonema spp</i>. were the most sensitive to Ni-spiked sediments in this study. Overall, <i>H. azteca</i> was the most sensitive to total Ni, …
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Investigating the cause(s) of benthic macroinvertebrate community impairment downstream of two Saskatchewan uranium operations
… were noted in 10-d whole-sediment bioassays with Hyalella azteca, although this lack of response could be partially due to sediment pore-water dilution resulting from the automated clean overlying water renewal process employed. Potential causes of benthic community impairment identified through …
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The Development of Ex vivo and In vivo Multiphase NMR Spectroscopy
Most biological and environmental samples are complex heterogenous mixtures composed of multiple phases (solids, liquids and gels). It is the interaction between these phases that give rise to environmental reactivity and biological function in intact samples. As traditional NMR has evolved as …