Essays about: "natural migration barriers"
Showing result 1 - 5 of 8 essays containing the words natural migration barriers.
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1. Potential migration routes for the alien species, pink salmon (Oncorhynchus gorbuscha) : investigating access in west and south coast rivers of Sweden
University essay from SLU/Dept. Of Aquatic ResourcesAbstract : Invasive alien species are one of the main drivers of ecosystem change globally, presenting challenges to biodiversity that take many forms Pink salmon, Oncorhynchus gorbuscha, has recently been observed on the Swedish west coast where its presence is the result of secondary spreading from populations introduced to the White and Barents Seas in northwestern Russia. In Sweden, O. READ MORE
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2. Manning’s roughness coefficient in small scale nature-like fish passages
University essay from Lunds universitet/Avdelningen för Teknisk vattenresursläraAbstract : Fishway construction remains a crucial measure in environmental adaption of flow barriers. A well-functioning fishway should be able to pass all naturally occurring species of fish and other aquatic fauna. READ MORE
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3. Highway To Hell: Can a bubble barrier guide descending salmonid kelt to safety?
University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskapAbstract : Loss of connectivity in riverine systems due to construction of hydropower dams has resulted in a worldwide decline of anadromous salmonid species such as Atlantic salmon (Salmo salar L.) and sea trout (Salmo trutta L.). The future of these species depend on the presence of available spawning habitat in freshwater river systems. READ MORE
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4. Food for Change: Exploring rural-urban linkages among youth in Guatemala
University essay from Malmö universitet/Fakulteten för kultur och samhälle (KS)Abstract : As the world grapples with increasing urbanization, population growth, climate change and depleting natural resources, there is an increased recognition that more food will have to be produced with fewer resources while food consumption has to shift rapidly towards more sustainable patterns. Meanwhile, although many are willing to work in and innovate agricultural practices, young people in rural areas still struggle to access the resources needed to be part of this shift, not to mention to make a living. READ MORE
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5. Natural migration barriers for fish by hydropower plants : methods to assess historic passability. Case studies of migration barriers
University essay from SLU/Dept. Of Aquatic ResourcesAbstract : Is it necessary to build fishways at all artificial migration barriers to restore and sustain bio-diversity? Hydropower plants have often been built at places where a difference in height has been used to gain more power, leading to the hypothesis that many hydropower dams have been built at natural migration barriers. How are Swedish running waters (not large rivers) assessed with respect to historical passability for fish at natural migration barriers and dams? How does one study a specific location with respect to the historical passability for different fish species? The methodologies that are evaluated in this thesis are relevant and specific information from a habitat mapping from Värmland County, where 2 903 km waterways already have been surveyed. READ MORE
