Sökning: "cormorants"

Visar resultat 6 - 10 av 15 uppsatser innehållade ordet cormorants.

  1. 6. Användning av åtelkameror för att uppskatta antalet sälar i fjordarna innanför Orust : en metodutvärdering

    Kandidat-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :Daniel Carlsson; [2019]
    Nyckelord :knubbsäl; Phoca Vitulina; 8-fjordar; EBFM; åtelkamera; time-lapse;

    Sammanfattning : I slutet av 1980-talet blev många fiskbestånd på svenska västkusten överfiskade vilket bl.a. resulterade i en minskning av kustnära bestånd av olika torskfiskarter. LÄS MER

  3. 7. Impact of Great cormorant (Phalacrocorax carbo sinensis) on post-smolt survival of hatchery reared salmon (Salmo salar) and sea trout (Salmo trutta)

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

    Författare :Carolina Gavell; [2018]
    Nyckelord :great cormorant; salmon; sea trout; sea trout; grey seal; post-smolt survival;

    Sammanfattning : To compensate for the losses due to altered stream habitat large amounts of hatchery-reared Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) are released into the Baltic Sea each year. During the last decades there have been an overall declining trend in the post-smolt survival of both hatchery reared and wild salmon in the Baltic Sea. LÄS MER

  4. 8. A diet study of post-breeding Great cormorants (Phalacrocorax carbo sinensis) on Gotland

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

    Författare :Anton Larsson; [2017]
    Nyckelord :Baltic sea; regurgitated pellets; otoliths; prey species composition; sea birds;

    Sammanfattning : The Swedish population of great cormorant (Phalacrocorax carbo sinensis) has rapidly increased to over 40 000 breeding couples since the EU-protection 1980. Since the cormorant are high efficient predators living in large colonies, they are accused for reducing fish populations and competing with fishery. LÄS MER

  5. 9. Prey choice of great cormorants (Phalacrocorax carbo) in a marine protected area : potential impact on collapsed fish stocks and implications for future monitoring

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Elin Ljunggren; [2017]
    Nyckelord :cormorant; Phalacrocorax carbo; diet; predation; 8-fjords area; fisheries; conflict;

    Sammanfattning : Great cormorant (Phalacrocorax carbo) populations have experienced a rapid growth in Europe since the 1980s, resulting in conflicts with fisheries over local fish resources. The 8-fjords area is a marine protected area on the Swedish west coast, where long term overfishing has led to a collapse of several local demersal fish stocks. LÄS MER

  7. 10. Mellanskarven (Phalacrocorax carbo sinensis) i Krankesjön - Analys av långtidserier av skarvförekomster och fisksamhällets utveckling i kombination med bytesval

    Master-uppsats, Lunds universitet/Miljövetenskaplig utbildning

    Författare :Jonathan Loive; [2015]
    Nyckelord :Earth and Environmental Sciences;

    Sammanfattning : This study analyzed highly detailed long-term information about occurrence of cormorants (Phalacrocorax carbo sinensis) and the fish community composition in lake Krankesjön, southern Sweden. Moreover, cormorant predation with regards to species and size preference were estimated using data from recovered PIT (Passive Integrated Transponders) tags. LÄS MER