Sökning: "downstream spawning"

Visar resultat 1 - 5 av 22 uppsatser innehållade orden downstream spawning.

  1. 1. Evolutionary conservation analysis of sequence variants underlying ecological adaptation in Atlantic herring

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Leyi Su; [2023]
    Nyckelord :Ecological adaptation; Evolutionary conservation; Atlantic herring;

    Sammanfattning : The Atlantic herring (Clupea harengus) is a model organism for exploring the genetic basis of ecological adaptation on account of its large effective population size which greatly restrains the disturbance of genetic drift. In this project, I conducted an evolutionary conservation analysis of the Atlantic herring genome using conservation scores generated by phastCon, phyloP and GERP++ in order to study the sequence variants related to salinity or spawning-time adaptation in Atlantic herring. LÄS MER

  3. 2. Evaluating an increased spill regime as a management tool to improve downstream passage of salmon smolt

    Master-uppsats, Karlstads universitet/Institutionen för miljö- och livsvetenskaper (from 2013)

    Författare :Mattias Hansson; [2022]
    Nyckelord :hydraulic modeling; hydroacoustic telemetry; time to event analysis; hydraulisk modellering; överlevnadsanalys; hydroakustisk telemetri;

    Sammanfattning : The anadromous Atlantic salmon (Salmo salar) is dependent on river connectivity to reach spawning and rearing habitats in rivers. Most rivers are today fragmented by artificial barriers such as hydroelectric powerplants (HEP) which impede this migratory movement. LÄS MER

  4. 3. Downstream migration and survival of Atlantic salmon (Salmo salar L.) kelts and fallbacks when passing a hydropower plant

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :Frans Byström; [2020]
    Nyckelord :migration; kelt; iteroparous; anthropogenic obstacle; survival; turbine passage;

    Sammanfattning : Repeat spawners of Atlantic salmon may be of great importance for population stability, the return spawners can significantly contribute to recruitment of juveniles. To have a significant proportion of repeat spawners in the population, it is necessary that salmons can successfully migrate back to the sea after spawning upriver. LÄS MER

  5. 4. Consequences on population dynamics following regained connectivity in pike (Esox lucius) spawning location

    Master-uppsats, Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Författare :Oscar Adolfsson; [2020]
    Nyckelord :dmixture; emigration; downstream spawning; pike-factory; restoration; sourcesink dynamics; spawning strategy;

    Sammanfattning : Distributional movements of subpopulations may act as a buffer to prevent the loss of a species in a certain area. However, within subpopulations adaptations may evolve that makes the inhabitants of a certain habitat to better cope with prevailing environmental conditions. LÄS MER

  7. 5. Highway To Hell: Can a bubble barrier guide descending salmonid kelt to safety?

    Kandidat-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Jonathan Nordin; [2020]
    Nyckelord :bubble barrier; non-physical barrier; fish passage; fish migration; hydropower; bubbelbarriär; icke-fysisk fiskledare; lax; öring; fiskvandring; vattenkraft;

    Sammanfattning : 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. LÄS MER