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Showing 1 to 20 of 57 for “"SECONDARY PRODUCTION"”.
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Input-output and secondary production
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1982.
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Stochastic methods for improving secondary production decisions under compositional uncertainty
… sustainable use of any metal will be a robust secondary recovery industry. Secondary recovery forestalls depletion of non-renewable resources and avoids the deleterious effects of extraction and winning (albeit by substituting some effects of its own). For most metals, the latter provides …
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Life History and Secondary Production of Caenis latipennis Banks (Ephemeroptera: Caenidae) in Honey Creek, Oklahoma
A study of the life history and secondary production of Caenis latipennis, a caenid mayfly, was conducted on Honey Creek, OK. from August 1999 through September 2000. The first instar nymph was described. Nymphs were separated into five development classes. Laboratory egg and nymph development …
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Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production
… brown algae. The influence of brown algae on secondary production extends to second-order consumers. Allorchestes compressa was the major prey of juveniles of the cobbler Cnidoglanis macrocephalus and the sea trumpeter Pelsartia humeralis, the main fish species in surf zone wrack accumulations …
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Comparisons of Secondary Production, Life History, and Mouthpart Functional Morphology Between Two Populations of the Amphipod Gammarus minus
… two populations were related to habitat. Annual production and life history of the populations were compared and their relationship to factors such as temperature, water-chemistry, and quantity of available organic matter were examined. Mouthpart and foregut morphology were compared between the …
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Life History and Secondary Production of Goniobasis proxima (Prosobranchia: Pleuroceridae) from Four Appalachian Headwater Streams in Western North Carolina
I investigated life history traits and secondary production of populations of Goniobasis proxima in four streams from July 2005 to June 2006. Measurements of canopy cover, conductivity, alkalinity, temperature, and nitrate-nitrogen (NO3-N), as well as snail size, density, and occupied substrate …
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Application of the ³H-Leucine incorporation technique for quantifying rates of bacterial secondary production associated with decaying wetland plant litter
… technique for quantifying rates of bacterial production has increased in popularity since its original description for bacterioplankton communities. Previous studies examining <sup>3</sup>H-leucine-incorporation conditions for bacterial communities in other habitats have reported a wide range …
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The impact of seasonally changing feeding habits on the secondary production and accumulation of mercury in a filter-feeding Caddisfly
… bivoltine on the South River. The estimate of secondary production for the summer cohort was 3,246 mg AFDW/m²/yr, while the estimate for the winter cohort was 2,145 mg AFDW/m²/yr. The secondary production also was estimated for each season based on food habits to determine the impact of the …
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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
… 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) in Stroubles Creek, a …
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Annual secondary production of fungal and bacterial decomposers associated with standing and benthic litter of the freshwater emergent macrophyte, <i>typha angustifolia </i>
… of plants within wetlands, but annual secondary production investigations are lacking. Microbial carbon assimilation into biomass and CO<sub>2</sub> mineralization may contribute considerably to wetland biogeochemical cycling and energy flow. Naturally-occurring <em>Typha …
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Salt in the Wound: Trophic Mismatches Emerge Between Macroinvertebrate Secondary Production and Basal Food Resources Along a Salinity Gradient in Central Appalachian Headwaters
… salinization by measuring macroinvertebrate secondary production across nine streams in the southwestern Virginia and West Virginia portion of the central Appalachian coalfield, with mean annual SC ranges from 16-1,185 μS/cm. Overall, secondary production along the salinity gradient was not …
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Biologia populacional e produção secundária de Olivancillaria vesica vesica (Gmelin, 1791) (Gastropoda : Olividae) na praia da Restinga da Marambaia, RJ
… the purpose of study the population biology and secondary production of Olivancillaria vesica vesica (Mollusca: Gastropoda: Olividae). Specimens were handmade collected in two transects and the lenght and width of your shells were measured in the field. Growth and mortality was estimated using …
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Quantifying macroinvertebrate structural and functional response to stream acidification and subsequent recovery in Shenandoah National Park
… macroinvertebrates produced in a year (i.e., secondary production) in two streams (1 acidified; 1 not acidified) to determine taxa and traits that are functionally sensitive to acidification. I used these structural and functional measures of sensitivity to determine if changes in trait …
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Short-term effects of defoliation by gypsy moth larvae on Appalachian headwater streams in Virginia
… benthic macroinvertebrate function (expressed as secondary production). The experimental design was to compare measurements in three streams that were extensively defoliated by gypsy moth larvae (defoliated treatment), with three streams that were not affected by gypsy moth larvae (reference …
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Net Productivity On Artificial Reefs In the Mississippi Sound Estimated From Settlement Plate Measurements
… sites, the main goal of which is to increase the production of economically and recreationally important fish, such as speckled trout, white trout, redfish, and black drum. The success of artificial reefs in meeting this goal depends in part on the quantity of primary and secondary production …
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Resident Benthic Fishes of Artificial Reefs in the Mississippi Sound: Effects of Habitat Relief and Subregion
… of these manmade structures to promote secondary production. Many researchers have questioned whether artificial reefs increase the production of fish biomass, or simply aggregate existing fish biomass. Most previous research has focused on production of transient fish biomass, because …
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The Ecology of Mayflies (Ephemeroptera) in the Guadalupe River Basin, Texas
Distribution, life 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 …
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Production of a Population of the Stout Razor Clam (Tagelus plebeius Solander) in a Virginia Estuary
<p>The annual net secondary production of the stout razor clam, <em>Tagelous plebeius</em>, was estimated at three sites on an intertidal sand flat at Lynnhaven Inlet, Virginia. Samples were taken at six week intervals for one year. The range of net production (P), mean annual biomass (B), and P/B …
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Studies on the meiofauna of rocky shores
… for 25 of total (excluding bacterial) secondary production. To follow this up, the impact of wave exposure on the meiofauna of one species of alga (viz. Gelidium pristoides) was examined on five shores around False Bay. Meiofaunal densities (dominated by animals between 63um-280um) were …
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Macroinvertebrate colonization and production in new experimental ponds
… measure the density of individual taxa. Secondary production was measured for seven dominant taxa. Although the estimation of secondary production required more time, it could be done at a similar level of precision as density and was considered more ecologically meaningful than …
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