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.
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Showing 1 to 20 of 33 for “"Mayflies"”.
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The Ecology of Mayflies (Ephemeroptera) in the Guadalupe River Basin, Texas
… histories, and production were considered for mayflies in the Guadalupe River basin, Texas. Distribution patterns and species richness were dictated by the stream source; springbrooks had fewer species and were dominated by a single species of South American origin. Streams fed by surface …
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Evolution and phylogeny of basal winged insects with emphasis on mayflies (Ephemeroptera)
<p>Ephemeroptera (mayflies) is a monophyletic group of semi-aquatic pterygote insects, comprising 3083 species, 376 genera, and 37 described families and are present on all continents, excluding Antarctica, being associated with freshwater and brackish water habitats. The order is unique among …
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DNA Barcode Examination of North American Mayflies Across Their Natural Distribution Reveals Cryptic Species Complexes
… constructed for three species of North American mayflies (Ephemeroptera) across their natural distribution. This order is important for water quality monitoring of streams and rivers and hence species level identifications have the potential for great application. These three species were chosen …
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Effects of the Cle Elum Reservoir on the Ephemeroptera (Mayflies) of the Cle Elum River
The purpose of this study was to determine the physical and chemical effects of the Cle Elum Reservoir on the Cle Elum River and to evaluate these effects in respect to the Ephemeroptera of the Cle Elum River. Specific objectives were: (1) To determine the effects of the reservoir on current …
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Determinants and Developmental Consequences of Organic Contaminant Uptake in Nestling Insectivorous Birds
… nestlings'’ diet was supplemented with Hexagenia mayflies collected from three locations containing different PCB burdens. Nestlings fed mayflies collected from a heavily contaminated site had significantly reduced relative growth rates and enlarged livers and hearts relative to controls (whose …
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Hydrodynamic controls on the movement of invertebrate larvae and organic matter in small streams
… behaviours in two rheophilous (‘flow-loving’) mayflies (Epeorus and Baetis) and two rheophobic (‘flow-avoiding’) mayflies (Ameletus and Paraleptophlebia) were compared to determine how benthic organisms disperse between and within habitat patches in hydrodynamically complex landscapes. The …
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Community responses of aquatic macroinvertebrates to heavy metals in laboratory and outdoor experimental streams
… groups varied between control and dosed streams. Mayflies were quite sensitive to Cu, particularly during the summer when water temperatures were higher. Community responses to Cu and Zn in outdoor experimental streams were similar to those observed at metal-impacted sites in the field. Control …
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A Survey of the Ephemeroptera of Pearson Creek, Missouri
… H. limbata, Ephoron album. The most common mayflies collected from Pearson Creek were species of Baetis, Stenacron, Stenonema, and Caenis. Ephemera traverae, Choroterpes oklahoma, and Habrophleboides annulata are new state records for Missouri.
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Invasive fish effects on the invertebrate constituents of wetland communities
… branchiopods, coenagrionids, and baetid mayflies. However when we compare the presence of stickleback versus no stickleback we find several differences among taxa abundance and evenness. Evenness among invertebrate communities within stickleback and no stickleback ponds was significantly …
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Relation between tolerances and distribution of two species of Ephemeroptera
… in the laboratory for aquatic nymphs of two mayflies, Baetis harrisoni Barnard 1932 and Choroterpes (Euthraulus) bugandensis (Kimmins 1956). These limits have been examined in the light of available information on the ecology of the nymphs, in order to see to what extent the distribution of …
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Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… tube-building chironomids, isopods, and clinging mayflies. The caddisfly, Hydropsyche spp., accounted for over 60 percent of the total organisms collected. A comparison of assemblage data obtained from the surface stones of the implanted substrates with data obtained from adjacent surface stones …
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Benthic Macroinvertebrate Susceptibility to Trout Farm Effluents
… treatments as the laboratory tests. Flat-headed mayflies were also collected from a nearby stream and transported to the mesocosms for a 10 day exposure. There was no significant difference between treatments in the laboratory tests after 20 days, but after 28 days the control was significantly …
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Biodiversity and Phenology of the Epibenthic Macroinvertebrate Fauna in a First Order Mississippi Stream
… seven species of stoneflies, six species of mayflies, six species of caddisflies, eleven species of beetles, five species of dragonflies, one damselfly species and two species of megalopterans, including the hellgrammite, <em>Corydalus cornutus</em>. All of the stoneflies collected were …
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The Ephemeroptera Larvae of Guatemala
The aquatic insect order Ephemeroptera (mayflies) is a major constituent of stream, and in some cases, lake environments. Although the systematics of the order in North America is relatively well understood, the documentation of Latin American taxa has only recently begun in earnest. This study …
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Alteration and recovery of a stream macroinvertebrate community exposed to fly ash effluent and an analysis of the causative factors
… all declined sharply. Ephemeroptera (mayflies) exhibited the greatest sensitivity to the fly ash effluent, while the beetle, Psephenus herricki (Coleoptera) was very resistant to the effects of fly ash. Recovery responses of the macroinvertebrate community were observed one month after …
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Impacts of aquaculture effluent on water quality and biotic communities in Virginia headwater streams
… abundance of sensitive macroinvertebrate taxa (mayflies, stoneflies, and caddisflies) were reduced downstream and pollution-tolerant non-insect taxa (isopods and gastropods) increased. EPA Rapid Bioassessment Protocol (RBP) reflected moderately-impaired water quality downstream at farms A and C, …
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The influence of ultraviolet-B radiation on benthic communities in Rocky Mountain streams with different metal exposure histories
… of UVB addition on the total abundance of mayflies, Heptageniidae, and Baetis bicaudatus was significantly greater in communities from metal-polluted sites compared to those from reference sites. The field experiment involved removing UVB for 60 days from portions of the streambed at 12 …
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Relative importance of Conservation Reserve Programs to mayfly, stonefly, and caddisfly species richness in the Kaskaskia River basin of Illinois
… environmentally sensitive orders, Ephemeroptera (mayflies), Plecoptera (stoneflies), and Trichoptera (caddisflies) (EPT) in the Kaskaskia River basin, a heavily impacted, predominantly agricultural watershed in central and southern Illinois. A total of 10,522 EPT specimens were examined from 84 …
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Ecological Studies on Benthic Macroinvertebrates in Lowland Rivers in Relation to Water Quality
… as tolerant of organic pollution, were dominant. Mayflies, stoneflies, beetles and caddis flies were restricted, these including most of the indicators of clean waters. This was because of their highly eutrophic nature, the naturally high organic loadings, and in some rivers, the physically …
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Ecotoxicological and genetic effects of a mixture of heavy metals on selected aquatic macroinvertebrates
… a population genetic study was conducted. Mayflies were collected from seven sites on the Arkansas River at four different time points. A region of the ND1 mitochondrial DNA gene was amplified by polymerase chain reaction and analyzed by single strand conformation polymorphism analysis to …
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