Global ETD Search
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Showing 1 to 15 of 15 for “"fish fauna"”.
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Trajectories of Change in South Africa's Freshwater Fish Fauna
… diversity, abundance, and survival of freshwater fauna and flora across the country. Freshwater fishes are recognised as South Africa's most threatened species group, with one third of species classified as threatened (Vulnerable, Endangered, Critically Endangered) by the International Union for …
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Caracterização e afinidades da ictiofauna do Reservatório de Juturnaíba, em Silva Jardim, Estado do Rio de Janeiro
The fish fauna of the Juturnaíba Dam, in Silva Jardim, Rio de Janeiro State, Brazil, is characterized and its similarity with the faunas of the São João river basin, the extinct Juturnaíba Lake, and the rivers emptying into the present dam (Bacaxá, Capivarí and São João) is evaluated. The fish …
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Fishes of the genus Lutianus off the East African coast
Volume 1. Fishes of the genus Lutianus off the East African coast. Volume 2. Notes on the biology of the Lutjanids of the East African coast. Volume 3. The coral structure of Tutia reef and its fish fauna. Volume 4. Supporting papers
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Effects of landlocked alewife introduction on white bass and walleye populations, Claytor Lake, Virginia
… stomach contents of eight species of piscivorous fishes. The vertical distributions by season of alewives, channel catfish, white crappie, walleye, and white bass are given. Each of the predator fishes seem to be found in close proximity to the alewife. Changes in the fish fauna of Claytor Lake …
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Some effects of abandoned manganese strip mines in Smyth County, Virginia on stream ecology
… area, was found to support fewer species of fish and benthic fauna than Crigger Creek, a comparable control stream. Siltation is probably the main contributing factor. Bedload was much greater in affected streams than in control streams. Although volume of bedload was high in Blue Spring …
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Multiscale Anthropogenic Impacts on Stream Condition and Fish Assemblages in Amazonian Landscapes.
… much, if not the majority, of the freshwater fish fauna of the Amazon basin, which itself is one of the most diverse in the world. Despite the biological significance of these stream networks, the consequences of land use change for the condition of instream habitat and fish fauna remain very …
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Influence of stream connectance and network spatial position on fish assemblage structure in the Kansas River basin, USA
Stream networks provide complex habitats for fish assemblages that can vary gradually along a gradient of stream size or abruptly at transition zones between large rivers and their tributaries. We evaluated the relative importance of these gradual and abrupt habitat transitions in regulating stream …
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Ein regelbasiertes Entscheidungsunterstützungssystem für Maßnahmen zur Gewässerstrukturverbesserung
… population of the macrozoobenthos and the fish fauna. The task of this work is the development of a decision support system (DSS-WRRL) for the determination of programmes of measures. The system shall help the responsible persons to preselect measures improving the morphological deficits in …
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Fish Community Assembly in the Missouri River Basin
Warmwater fish communities of the Missouri River basin are poorly studied. I conducted a series of investigations intended to explain fish community structure and composition therein. I focused on relations between environmental characteristics and fish species because abiotic factors are …
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Patterns of Historical and Contemporary Distribution and Occurrence of Imperiled Fish Populations in East Texas Streams
<p>East Texas supports a very diverse freshwater fish fauna, yet many of these species are listed as Species of Greatest Conservation Need (SGCN). In this study, I investigated historical and contemporary distribution trends of ten fish species listed as SGCN within the Neches, Sabine, and Cypress …
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Analysis of the antifreeze glycoprotein containing genomic locus in the Antarctic notothenioid fish dissostichus mawsoni
… extinction of most of the late Eocene temperate fish fauna. A notothenioid ancestral stock survived and went through an adaptive radiation that gave rise to a variety of ecotypes that filled the empty niches. The notothenioid fishes now account for 95% of the fish biomass that inhabits the …
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Historical baselines and a century of change in the demersal fish assemblages on South Africa's Agulhas Bank
… interpretation of recent variability observed in fish populations, species compositions, distribution ranges or ecological indicators, depends on knowledge of their past dynamics and historical states. The onset of systematic fisheries data collection typically lagged decades or even centuries …
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Ökologie der Fischbestände in Fließgewässern des Khentii-Gebirges (Mongolei): Bestandsaufbau, Dynamik und Gefährdung durch den Gold-Tagebau
Die Fischfauna der Mongolei umfasst 64 Arten, von denen aktuell in der Roten Liste elf Arten als regional bedroht und vier Arten als potentiell bedroht eingestuft werden. Eine der wichtigsten Ursachen für den Rückgang der Arten ist der Gold-Tagebau. Viele Goldvorkommen lagern in alluvialen …
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Distributional relationships among subtidal algae, sea urchins and reef fish in northeastern New Zealand
… among large brown macroalgae, sea urchins, and fishes were investigated in northeastern New Zealand during the period 1988 - 1993. The Cape Rodney to Okakari Point Marine Reserve was the site of many of these investigations. The patterns of abundance of large brown macroalgae and urchins down …
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Effect of environmental temperature on Antarctic fish antifreeze protein activity and concentration
… is abundant in this region. The largest group of fishes in this region is the suborder Notothenioidei. For notothenioid fishes blood serum osmolytes only depress the freezing point of their blood to about -1.0°C, almost a full degree warmer than the environmental freezing point. The success of …