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 12 of 12 for “"Epilithic"”.
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The effects of toluene contamination on epilithic bacterial communities in a stream
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Changes in respiration rates and biomass attributes of epilithon due to extended exposure to zinc
… colony forming units. An increase in epilithic glucose respiration per unit biomass consistently occurred 5 to 10 days after dosing with 1.0 mg Zn liter⁻¹ was started. At the same time significantly lower epilithon biomass occurred in the high dosed streams relative to controls in 3 …
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The spatiotemporal dynamics of bacterial and fungal abundance in Great Plains non-perennial streams
… surface waters, benthic (stream bed) sediments, epilithic biofilms (rock surfaces), and leaf surfaces were not related to the duration of flowing conditions before sampling, as expected, but did vary based on distance from the outlet of the watershed and differed between wet and dry sampling …
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ΣΥΣΤΗΜΑΤΙΚΗ ΚΑΙ ΟΙΚΟΛΟΓΙΚΗ ΜΕΛΕΤΗ ΘΑΛΑΣΣΙΩΝ ΕΥΕΝΔΟΛΙΘΙΚΩΝ ΚΥΑΝΟΦΥΚΩΝ ΑΠΟ ΑΣΒΕΣΤΟΛΙΘΙΚΕΣ ΑΚΤΕΣ ΤΗΣ ΕΛΛΑΔΟΣ
… WERE IDENTIFIED BELONGING TO THE ACCOMPANING EPILITHIC AND CHASMOEUDOLITHIC CYANOPHYTES.
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The effects of nutrients and hydrology on periphyton and phytoplankton in Fraser River tributaries, British Columbia
… in algal biomass and taxonomic composition. July epilithic periphyton chlorophyll a was weakly correlated with TN, while October periphyton was significantly related to DP and conductivity. The phytoplankton biomass in July was best predicted by TP (r2 = 0.70, p ≤ 0.001, n = 19), while October …
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The structural and functional dynamics of selected species -populations of freshwater snails:towards a systems approach
… A.fluviatilis is a herbivore which feeds on epilithic algae, particularly diatoms. P.contortus is a detrivore which is only able to make use of the bacterial fraction of its food. The functional ecology of these two species is considered in terms of the classical energy budget statement and …
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Environmental Factors Determining the Pre-Restoration Benthic Macroinvertebrate Assemblage In A Stream Used By Cattle
… on rocks (ash-free dry mass, chlorophyll a, epilithic biomass) influenced the benthic macroinvertebrate assemblage more than physical environmental variables related to the substrate composition (% fines, % gravel, Trask's sorting coefficient). Visual habitat estimates were not as effective …
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Organic Matter Dynamics and Trophic Structure in Karst Groundwater
… streams. 13C acetate was incorporated into epilithic biofilms and fine benthic organic matter (FBOM). Some primary consumers, Fontigens tartarea, Gyraulus parvus, and Physa were highly labeled and showed a longitudinal labeling pattern consistent with the consumption of epilithic biofilms. …
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Quantifying the environmental factors that determine benthic macroinvertebrate assemblages in streams by analyzing stressors associated with a gradient of cattle grazing
… autochthonous food variables (chlorophyll a and epilithic biomass) were not as important in influencing assemblage structure. Based on a comparative analysis of reach-scale habitat measures and estimates, quantitative measures of % fines, collected from within an enclosed sampler concurrently …
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Differential Utilization of Allochthonous and Autochthonous Carbon By Aquatic Insects of Two Shrub-Steppe Desert Spring-Streams: A Stable Carbon Isotope Analysis and Critique of the Method
… stream among the various types of producers: epilithic aufwuchs, filamentous green algae, emergent macrophytes, and submerged macrophytes. The wide isotopic variance among autochthonous carbon sources, some of which were consistently in the expected allochthonous isotopic range, made it …
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River oxygen uptake by benthic microorganisms
… with an erosional environment, which promote epilithic metabolic processes, and those with a depositional environment where detrital processes predominate.
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Documenting the association between a non-geniculate coralline red alga and its molluscan host
To further investigate the strength of the association and the relative advantages of the association to both organisms, several manipulation experiments were set up. A cage experiment set up in the shallow subtidal zone showed that the coralline survived equally well without the winkle and did …