Search for dissertations about: "Fish Migration"

Showing result 1 - 5 of 46 swedish dissertations containing the words Fish Migration.

  1. 1. Atlantic salmon in regulated rivers Migration, dam passage, and fish behavior

    University dissertation from Karlstad : Karlstads universitet

    Author : Daniel Nyqvist; Karlstads universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fish migration; fish passage; downstream migration; kelt; smolt; Biology; Biologi;

    Abstract : Hydropower dams block migration routes and disrupt longitudinal connectivity in rivers, thereby posing a threat to migratory fish species. Various fish passage solutions have been implemented to improve connectivity with varying success. READ MORE

  2. 2. Does fish health matter? The Utility of Biomarkers in Fish for Environmental Assessment

    University dissertation from Göteborg : University of Gothenburg

    Author : Niklas Hanson; Göteborgs universitet.; Gothenburg University.; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biomarkers; Fish; Environmental monitoring; Ecological risk assessment; Rainbow trout; Perch;

    Abstract : Two common strategies to assess exposure to environmental toxicants are to measure chemical concentrations in the environment and to examine the presence of certain species that are known to be sensit... merive to pollution. READ MORE

  3. 3. Waterfowl in temperate eutrophic lakes - Interactions with macroinvertebrates, submerged vegetation and fish

    University dissertation from Ola Marklund, Department of Ecology, Limnology, Lund University, 223 62, Lund

    Author : Ola Marklund; Lunds universitet.; Lund University.; [2002]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Hydrobiology; marine biology; aquatic ecology; limnology; Marinbiologi; limnologi; akvatisk ekologi; Chara; Asellus; chironomidae; ultraviolet radiation; epiphytes; predation; herbivory; diel vertical migration; fish; Waterfowl; macroinvertebrates; submerged vegetation;

    Abstract : Popular Abstract in Swedish I denna avhandling har jag fördjupat mig i de ekologiska sambanden mellan några av de mest påtagliga och kända organismerna i sjöar och dammar, nämligen sjöfåglar, undervattensväxter, smådjur (från och med nu kallade evertebrater, vilket betyder ryggradslösa djur), och i viss grad fisk. Bland sjöfåglarna (här avses främst änder, gäss, svanar och sothöns) finns det både växtätare, evertebratätare, fiskätare och allätare. READ MORE

  4. 4. Large-scale releases of native species the mallard as a predictive model system

    University dissertation from Umeå : Sveriges Lantbruksuniversitet

    Author : Pär Söderquist; Högskolan Kristianstad.; Sveriges lantbruksuniversitet.; Högskolan Kristianstad.; Högskolan Kristianstad.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Anas platyrhynchos; Farmed; Hunting; Introgression; Longevity; Mallard; Migration; Morphology; Population genetic; Restocking; SNPs; Sweden;

    Abstract : Human alteration of natural systems, and its consequences are of great concern and the impact on global ecosystems is one of the biggest threats that biodiversity stands before. Translocations of invasive species, as well as intraspecific contingents with non-native genotypes, whether they are deliberate or unintentional, are one such alteration and its consequences are continuously being assessed. READ MORE

  5. 5. Eel migration - results from tagging studies with relevance to management

    University dissertation from Stockholm : Department of Ecology, Environment and Plant Sciences, Stockholm University

    Author : Niklas B. Sjöberg; Stockholms universitet.; [2015]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Anguilla anguilla; Migration; Stocking; Marking; Anguillicola crassus; Data storage tags; Carlin tagging; Strontium; Survival analysis; Dormancy; Lake Mälaren; Baltic Sea; Atlantic Ocean; Sargasso Sea; marin ekologi; Marine Ecology;

    Abstract : In response to the drastic decline of the European eel (Anguilla anguilla (L.)) fisheries have been reduced and elvers are stocked in areas where natural abundances are low. READ MORE