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 115 for “"fish communities"”.
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Assessing the Sustainability of Fish Communities in Glacial Lakes: Habitat Inventories and Relationships Between Lake Attributes and Fish Communities
… relationships between habitat variables and the fish communities in large lakes. The objectives of my research were to: 1) quantify the available aquatic habitats in 15 South Dakota large lakes, 2) investigate the use of Geographical Information System technology to create aquatic habitat layers, …
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Ecology of Fish Communities in Nebraska Sandhill Lakes
Fish populations recruitment, growth, and mortality are regulated by biotic and abiotic factors. The first study objective was to evaluate the influence of biotic and abiotic characteristics on the fish communities in Nebraska Sandhill lakes. I selected 30 lakes and measured fish community …
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Outcomes of river rehabilitation on instream hydraulics and fish communities
All fish species have specific habitat requirements, which differ according to life history and life stage. Where requirements are not met, or are inadequate for a particular species, the species will be locally absent or the population in poor condition and abundance. As a result of numerous …
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How climate change and agriculture could reshape the midwestern stream fish communities
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Correspondence Between Aquatic Ecoregions and the Distribution of Fish Communities of Eastern Oklahoma
I assessed fish community data collected by the Oklahoma Conservation Commission from 82 minimally impaired wadeable reference streams in eastern Oklahoma to determine whether existing aquatic ecoregions provide the best framework for spatial classification for the development of biological …
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Functional structure of herbivorous fish communities in the Wakatobi National Park, Southeast Sulawesi
Marine fish play important functional roles on coral reef systems in regulating ecosystem resilience. Herbivores are key indicators of a reefs resilience to disturbances in particular to regime shifts to algae dominated states. The importance of understanding the functional role of key taxa in …
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Natural Barrier Assessment and Modeling for Fish Communities in Delaware Water Gap National Recreation Area
… role in structure and composition of stream fish habitat. Determining the effects of natural barriers on fish communities is important for understanding ecological processes that may occur throughout barrier-affected habitats. Additionally, modeling the likelihood of natural barrier …
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Abundance Trends and Drivers of Change in Freshwater Fish Communities of the New River Basin
… as drivers of abundance patterns of native fishes in the highly invaded and anthropogenically impacted New River basin (NRB) in the Appalachian region of the United States. In chapter 2, I examine current native and non-native species abundance patterns related to the highly variable …
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Characterizing the trophic niche of non-native psedorasbora parva and the consequences for native fish communities.
Introductions of non–native fish can be a key driver of environmental change that has major implications for biodiversity and ecosystem functioning, including the adverse consequences of increased inter-specific competition for native fishes. Here, the consequences of an introduction of a model …
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Empirical evaluation of the effectiveness of South Africa's marine protected area network in representing fish communities
In this study, fish community structure as sampled by shore angling, trawling, boat-based line-fishing and seine netting was compared across the EEZ of South Africa, including sites in designated MPAs. Multivariate statistics were used to assess the extent to which MPAs represent the full range of …
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Assessing the effects of fishing on fish communities using South African case studies : empirical and theoretical approaches
… whether there were changes in the structure of fish communities off the of South Africa using two case studies, to explore the response of fish communities to the proposed creation of Marine Protected Areas and to investigate the alternate application of spatially uniform and heterogeneous …
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Using the Index of Biotic Integrity of Fish Communities to Evaluate Habitat Quality in Middle Chattahoochee River Tributaries
… human influence. The thesis to be tested is: 'Fish community IBI scores of different watersheds within the Middle Chattahoochee drainage basin will reflect varying degrees of anthropogenic impact on habitat quality.' Samples were taken twice per year during Spring and Fall over a time span of …
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Ocean Acidification and Seasonal Temperatures Counter Positive Novel Species Interaction and Warming Effects on Tropicalising Temperate Fish Communities
… extensions. In Australia, over 150 tropical fish species have been observed moving poleward into temperate marine ecosystems but often fail to establish due to hostile conditions (winter temperatures and environmental novelty). However, ocean warming could minimise lethal winter effects on …
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Temporal Change in Fish Communities and Modification of the Index of Biotic Integrity for the James River of the Dakotas
… leading to an unstable, yet persistent, fish community. My first objective was to examine persistence of the James River fish community over an 11 and 25-year period. My second objective was to assess the relative abundance of fish among four major habitats (snag, low head dam. rocky …
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The development of geomorphic and hydraulic complexity within streams and its influence on fish communities following glacial recession in Glacier Bay, Alaska
Studies of landscape development via primary successional processes are an important area of research for understanding how landscapes evolve into stable, diverse ecosystems. This research sought to assess how geomorphic and hydraulic complexity alter as streams develop following glacial recession. …
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Recovery of the Fish Population of a Municipal Wastewater Dominated, North Texas Creek After a Major Chlorine Disturbance
… the effects of a major chlorine disturbance on fish communities in Pecan creek by the City of Denton's Pecan Creek Water Reclamation Plant. Fish communities in Pecan Creek were sampled using a depletion methodology during February, April, July, and November, 1999. February and April sampling …
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Relative Roles of Environmental Conditions and Riverscape Connectivity On Fish Metacommunity Structure
… conservation management and restoration of fish communities in dendritic river networks. This study investigates the relative roles of abiotic conditions and spatial factors in structuring stream fish communities and aims to enhance scientific understanding of these structuring factors by …
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