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 27 for “"Freshwater habitats"”.
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Recovery of Oregon Coast Coho Salmon (Onchorhynchus kitsutch) through Restoration of Freshwater Habitats
… historic levels. Since the 1980s, restoration of freshwater habitat has become a common practice in the attempt to recover Pacific salmon populations. I used two databases, the Oregon Watershed Restoration Inventory, and the Salmon Recovery Tracker, to analyze habitat restoration and coho salmon …
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Environmental DNA is an Effective Method to Monitor Species in Various Freshwater Habitats
<p>This research investigated the use of DNA shed from individuals into the environment (eDNA) to monitor three amphibian species and two trout species associated with habitat intersected by Interstate-90 in Snoqualmie Pass, Washington. This included a large catchment area within creeks and nearby …
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Growth of Age-0 Atlantic menhaden (BREVOORTIA TYRANNUS) in Two Tidal Freshwater Tributaries of Chesapeake Bay
… (Brevoortia tyrannus). Growth rates from tidal freshwater habitats of the Mattaponi and James Rivers, Virginia in 2009 were described and compared using otolith microstructural analyses. Larval tidal freshwater growth rates were significantly faster in the culturally eutrophic James River when …
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The bioenergetics of a population of Asellus Aquaticus (L.) (Crustacea, Isopoda)
… encountered in sampling populations in freshwater habitats. The aim of the present study was to produce a complete energy budget for a population of Asellus aquaticus by combining field population data with studies of respiratory and feeding activity in the laboratory. The site selected …
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Spatial and temporal distribution of larval fishes in a large tidal river.
… larval fish assemblages from unregulated, tidal freshwater rivers. Patterns in the spatial and temporal distribution of larval fishes in the Mattaponi River were examined. Sampling took place on a weekly basis from February through August, 2006 and 2007. Larval fishes were categorized by taxa, …
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Factors affecting distribution and habitat selection of water shrews Neomys fodiens
… by comparing populations in central England freshwater habitats. Bait tube surveys were undertaken at 32 freshwater sites to establish water shrew presence, half of which were found to contain water shrews. Habitat surveys were undertaken and, in addition to water shrew presence/absence data, …
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Algal resource depression by macro-invertebrate herbivores in a chalk stream: An empirical approach
… in all major biome types; including benthic freshwater habitats. Algal biofilms and their herbivore consumers are therefore important components of stream food webs. However there is relatively little empirical data quantifying the strength of these algal-herbivore interactions, or how these …
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Gulf Sturgeon of the Pascagoula River: Post-Katrina Assessment of Seasonal Usage of the Lower Estuary
… Chemise as the primary travel corridor between freshwater habitats and marine feeding grounds. The western distributary mouth was more highly utilized by Gulf sturgeon during seasonal migrations. Interpolated habitat maps of sediment composition and macrofaunal abundance reveal that this area …
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Gulf Sturgeon (<i>Acipenser oxyrinchus desotoi</i>) Pre-Restoration Occupancy Patterns on Ship Island, Mississippi Sound with an Evaluation of Designated Critical Habitat Use by Eastern and Western Population Segments
… rivers. Gulf Sturgeon use multiple marine and freshwater habitats throughout their lifetime; critical habitat should be protected and expanded to possibly assist in population recovery for this species.</p>
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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
… non-native fishes can cause trophic cascades in freshwater habitats; these effects may be amplified in ephemeral/temporary habitats. Non-native brook stickleback fishes (Culaea inconstans) were first documented on the Turnbull National Wildlife Refuge (WA) in 1999 and are now present in many …
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Water laws and the cultural values associated with rivers: Current frameworks and future directions.
… decline. They are the most threatened of all freshwater habitats, and threats to their ecological integrity are both increasing and compounding. Rivers are crucial for supporting biological diversity (being unusually biodiverse habitats) and are key to the function of the Earth system. Rivers …
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PROTEOMIC ANALYSIS OF TWO DIFFERENT STATES OF NAEGLERIA FOWLERI
… free-living ameboflagellates found in soil and freshwater habitats throughout the world that cause a fatal disease in humans called Primary Amoebic Meningoencephalitis (PAM). Mechanisms of host resistance or susceptibility to infection have not been fully elucidated, and possible treatment …
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Barcoding and eDNA metabarcoding of a rapidly changing Neotropical freshwater fish community
… Neotropical region comprises one of the greatest freshwater fish diversities in the world. Conservation and management actions in freshwater realms face great challenges in this region due to an insufficient knowledge base (e.g. shortage of taxonomic expertise, lack of robust, routine, …
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Embryotoxicity of dioxin-like chemicals extracted from American eels (Anguilla rostrata) from the St. Lawrence River System
… little is known about eels once they leave their freshwater habitats and migrate to the Sargasso Sea to reproduce. Ocean conditions, habitat destruction, disease, reduced lipid content, over-fishing, physical barriers (hydroelectric dams), and chemical contamination are all possible reasons for …
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Characterizing the Microbiome of Scottish Freshwater Pearl Mussels (Margaritifera margaritifera): A Metabarcoding Analysis using Next-Generation Sequencing
Bivalves, such as the freshwater pearl mussel (Margaritifera margaritifera), are keystone species in freshwater habitats, functioning as ecosystem engineers, biological indicators, and flagship species. Despite their ecological significance, M. margaritifera populations are undergoing rapid …
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Studies on the Molecular Biology of Naegleru Fowleri and Identification of N. Fowleri in the Environment
… fatal PAM after recreational or work exposure to freshwater; accordingly, there is a need for monitoring the presence of pathogenic amebeflagellates in public freshwater. The present study was conducted to determine whether a nested PCR assay could be used for detection of N. fowleri in freshwater …
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Using environmental DNA metabarcoding to monitor fish biodiversity and assess anthropogenic barrier impacts on the river Mersey, UK
Freshwater habitats, despite their limited volume, support almost 10% of global biodiversity and are facing increased anthropogenic threats worldwide. Dams and weirs, for example, create habitat fragmentation, changing water flow and water levels, blocking crucial nutrients passing through river …
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Ecology and Genetics of Blanding's Turtles in an Urban Landscape
… turtle (Emydoidea blandingii) inhabits shallow freshwater habitats in North America and is undergoing population declines throughout its range. The loss of habitat is largely responsible for the demise of this semi-aquatic turtle. Moreover, the subdivision and insularization of remaining …
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RESOURCE SUBSIDIES ACROSS THE AQUATIC-TERRESTRIAL BOUNDARIES OF TEMPORARY PONDS
Aquatic habitats are closely linked to surrounding terrestrial environments via reciprocal subsidies. Much of the research on these subsidies has been focused on streams, while subsidies across aquatic-terrestrial boundaries of other aquatic systems, like temporary ponds, have received little …
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