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 71 for “"macrophyte"”.
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Detached macrophyte accumulations in surf zones: Significance of macrophyte type and volume in supporting secondary production
Detached macrophytes (sea grass and macroalgae) are transported from more offshore areas and accumulate in large volumes in surf zones, where they are commonly called wrack. In coastal regions in other parts of the world, wrack transported from one habitat to a second habitat can be considered as a …
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Metal cycling in macrophyte dominated wastewater ponds
Thesis (M.S.)--Michigan State University. Dept. of Fisheries and Wildlife, 1973
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Aquatic macrophyte-derived biomarkers as palaeolimnological proxies on the Tibetan Plateau
… on the Tibetan Plateau with a focus on aquatic macrophyte-derived biomarkers. Submerged aquatic macrophytes have to be considered to significantly influence the sediment organic matter due to their high abundance in many Tibetan lakes. They can show highly 13C-enriched biomass because of their …
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Marine macrophyte monitoringenabling scalability through remote sensing data and cloud computing
La introducción de especies exóticas invasoras, el cambio climático, las modificaciones de hábitats marinos y la tendencia hacia la eutrofización costera, ya han afectado a la distribución y salud de las especies de macrófitos marinos, causando importantes pérdidas de biodiversidad en todo el …
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Protozoan communities, macrophyte vegetation and trophic status of northern Michigan wetland lakes
… to simultaneously sample protozoan communities, macrophyte vegetation, water chemistry and nutrient status, and primary productivity of the phytoplankton in each of the four major types of wetlands -- bogs, fens, marshes, and swamps. The following hypotheses were supported by data from this …
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The impact of macrophyte mats on biodiversity and ecosystem functioning of benthic communities
Macroalgal blooms, such as Ulva spp., are a common disturbance to estuarine benthic fauna worldwide. As large quantities of macroalgae break free from growing substrates, drifting mats are formed that eventually deposit in low energy environments, including intertidal sandflats. The mats will …
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Assessment of Changes in the Aquatic Macrophyte Community in the Upper San Marcos River
No abstract prepared.
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Carbon gains, losses, and feedbacks in shallow, eutrophic lakes of phytoplankton and macrophyte dominance
… their high perimeter:area ratio. Shifts between macrophyte and phytoplankton dominance are widespread and common in shallow lakes, with potentially large consequences to regional carbon cycling. I thus compared a lake with clear-water conditions and a submerged macrophyte community to a turbid, …
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The aquatic macrophyte Vallisneria americana as a biomonitor of site quality in Great Lakes areas of concern.
Leaf-to-root surface area ratios in Vallisneria americana provide a simple and inexpensive, relative measure of sub-lethal effects of organochlorine contamination. The present study was conducted to determine whether this index of surface area could be used as an effective biomonitor of overall …
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Effects of repeated early season herbicide treatments of curlyleaf pondweed on native macrophyte assemblages in Minnesota Lakes.
… has the ability to negatively affect native macrophyte growth by forming dense monotypic canopies in late spring and releasing nutrients in early summer. Because of the negative impact on natural ecosystems along with the problems curlyleaf can cause for people, there is serious interest in …
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Changes in benthic marine macrophyte community structure in the Strait of Georgia: long-term and grazing responses
Benthic marine macrophyte community structure at two sites near Bath and Sear Islands in the Strait of Georgia, British Columbia, was quantified from the high tide level on the shore to about 10 m below zero tide level. Data obtained from the sites during the summers of 1972 through 1975 and in …
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THE ECOLOGY OF A SUBMERSED MACROPHYTE, MYRIOPHYLLUM HETEROPHYLLUM: COMPETITION FOR NUTRIENTS WITH PHYTOPLANKTON AND SEASONAL CHANGES IN TISSUE MINERAL CONTENT
… levels in the water determine whether submersed macrophytes or phytoplankton will become dominant in the littoral zone, and that the capacity of the littoral sediments to sorb phosphorus is a critical factor in regulating nutrient availability in the water. Data on the seasonal changes in …
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AN INVESTIGATION OF AQUATIC MACROPHYTE-BASED AQUATIC WASTEWATER TREATMENT SYSTEMS FOR TEMPERATE CLIMATES (ELODEA NUTTALLII, PHOTOSYNTHESIS, NUTRIENT BUDGET, ACTIVE TRANSPORT, NITRIFICATION)
… use in temperate regions. A pilot-scale aquatic macrophyte-based aquatic treatment system was designed to treat primary effluent. Four aquatic macrophytes (Elodea nuttallii, Lemna minor, Myriophyllum heterophyllum, Ceratophyllum demersum) were evaluated as candidates. The hydraulic, organic, and …
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Assessing interactions between nutrients and toxicity : influences of nitrogen and phosphorus on triclosan toxicity to the aquatic macrophyte "lemna gibba".
… on triclosan toxicity to a model aquatic macrophyte Lemna gibba were explored. Triclosan effective concentrations varied by up to 6.5-fold depending on nutrient treatment and standardized endpoint. Mesocosm results validated these laboratory findings by also indicating greater …
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Assessing interactions between nutrients and aquatic toxicity : influences of nitrogen and phosphorus on ionic silver toxicity to the aquatic macrophyte Lemna gibba.
… of ionic silver toxicity to the model aquatic macrophyte Lemna gibba over 7-d study periods. The experimental results indicated that L. gibba were more sensitive to silver (e.g., lower EC50 values) when N and P concentrations were higher. In addition, greater ionic silver toxicity occurred …
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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>
<p>Fungi and bacteria are significant decomposers 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. …
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Determining the effects of non-native brook stickleback (Cualea inconstans) on the lentic systems at Turnbull National Wildlife Refuge, Cheney, WA
… 2015, I compared the macro invertebrate and macrophyte community characteristics, fingernail clam population and stress metrics, and water quality parameters in twelve lentic systems on the refuge; those that contain brook stickleback or are fish free, and are either temporary or permanent. …
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