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Showing 1 to 18 of 18 for “"caddisflies"”.
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Freshwater Invertebrate Assimilation Nutrients from Detrital Biofilms Under Light and Phosphorus Manipulation
… I conducted a feeding study using detritivorous caddisflies (i.e. <em>Pycnopsyche </em>sp.) and conditioned leaf litter across a fully-factorial experimental set up and fed radiolabeled litter in the lab. Additionally, I used dual labels of <sup>14</sup>C and <sup>33</sup>P to trace radiolabeled …
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Contribuição ao estudo dos Trichoptera Kirby, 1813, na Represa dos Ciganos, Rio de Janeiro, baseada em larvas, pupas e casas (Insecta)
… (1981a) that only a third of brazilian imago caddisflies were described. There are about fourty cases and half-dozen of imnature brazilian stages described, since their identification needs the knowledge of the larva-pupa-imago ecloded under control. In order to study brazilian caddisflies it …
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Community responses of aquatic macroinvertebrates to heavy metals in laboratory and outdoor experimental streams
… field sites were dominated by net-Spinning caddisflies (Hydropsychidae) and Orthocladiini chironomids. The similarity of these experimental results to those observed in the field suggest that macroinvertebrate community responses to heavy metals are highly predictable. Responses of these …
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Studies on the Odonata and Trichoptera of high-elevation lakes of northern Colorado and southern Wyoming
… Forest) in Colorado and Wyoming. I report adult caddisflies from 136 montane and alpine lentic habitats, primarily lakes, of seven northern Colorado counties for the first time. My objective was to provide species records of adult and larval caddisflies from high-altitude lentic habitats that are …
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Heavy metals partitioning in a stream receiving urban runoff
Water, sediment, detritus, caddisflies, snails, and crayfish were collected from Bull Run between July 31 and October 2, 1977 and analyzed for Fe, Mn, Ni, Pb, Cd, Zn, Cr, and Cu by atomic absorption spectrophotometry after appropriate digestion and extraction procedures. The samples were collected …
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Forces Structuring Caddisfly Communities: Biogeographical to Anthropogenic Effects
… and historical processes on local communities of caddisflies, aquatic insects in the order Trichoptera, within the Nearctic bioregion. I focused primarily on communities in running-water (lotic) systems in the United States and Canada. Much of my research on Trichoptera specimens and freshwater …
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Assemblage characteristics and sampling considerations for aquatic macroinvertebrates inhabiting a lower Mississippi River stone dike
… organisms/m²), characterized by net-spinning caddisflies, 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 …
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Biodiversity and Phenology of the Epibenthic Macroinvertebrate Fauna in a First Order Mississippi Stream
… 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 members of the family …
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Impacts of aquaculture effluent on water quality and biotic communities in Virginia headwater streams
… 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, and only slightly or …
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Relative importance of Conservation Reserve Programs to mayfly, stonefly, and caddisfly species richness in the Kaskaskia River basin of Illinois
… 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 sites across the basin during May and June of …
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Life history and secondary production of Cheumatopsyche spp. in a small Appalachian stream with two different land uses on its watershed
Ecological parameters of hydropsychid caddisflies are very important for production dynamics of stream ecosystems, due to the abundance and biomass of these collectorfilterers in many stream types. I studied life history and secondary production of Cheumatopsyche spp. (Trichoptera: Hydropsychidae) …
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Dietary Effects on the Stoichiometry of Growth, Regulation, and Wastes of Ozark Stream Insect Detritivores
… of microbial C and P by the detritivorous caddisflies Pycnopsche lepida, Lepidostoma sp., and Ironoquia sp. Results showed no effects of leaf type on incorporation efficiencies, however elevated litter P content reduced caddisfly incorporation efficiency of microbial P, and there were …
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Factors affecting growth and condition of stocked rainbow trout in eastern Washington lakes
… correlated to biomass of odonates, amphipods, caddisflies, calanoid copepods and density of dipterans and hemipterans were generally positive regardless of season. Among autumn measures, single biological predictors including biomass of coenagrionid damselflies and Aglaodiaptomus copepods …
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ENERGY FLOW AND MACROINVERTEBRATE PRODUCTION IN PANAMANIAN HIGHLAND STREAMS: ASSESSING THE IMPACTS OF AMPHIBIAN DECLINES
… production was dominated by hydropsychid caddisflies in pre-decline reaches, whereas black flies dominated filterer production in post-decline reaches. Overall, detritus and detritivores dominated energy flow in all study reaches. However, scrapers were well represented in these systems …
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The effect of resource stoichiometry on fish and macroinvertebrate nutrient excretion
… excretion and diet. For example, hydropsychid caddisflies had the highest macroinvertebrate P excretion, possibly explained by the low N:P of seston. However, shredders, eating on a very low N and P diet of leaf detritus, had very low N and P excretion. The relationship between consumers, their …
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Life History and Case Building Behaviors of Phylloicus ornatus (Banks) (Trichoptera: Calamoceratidae) In Two Spring Fed Tributaries in the Central Edwards Plateau Bioregion of Texas
The life history and case-making behaviors of Phylloicus ornatus from two springfed first order streams in the Edwards Plateau Bioregion of Texas were studied from January 1998 to November 1999. Field larval, pupal and adult samples and laboratory rearings indicated a multivoltine cycle. First …
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The influence of ultraviolet-B radiation on benthic communities in Rocky Mountain streams with different metal exposure histories
… and the abundance of grazers, mayflies, caddisflies, Orthocladiinae midges, and the mayfly Baetis bicaudatus compared to controls. Although grazer abundance was significantly greater in UVB removal treatments, no treatment differences were found in algal biomass or Heptageniidae …