Sökning: "cormorant"

Visar resultat 6 - 10 av 19 uppsatser innehållade ordet cormorant.

  1. 6. Invasive round goby, Neogobius melanostomus - suitable prey for native cod, Gadus morhua?

    Kandidat-uppsats, SLU/Dept. Of Aquatic Resources

    Författare :Andreas Ljung; [2020]
    Nyckelord :Round goby; invasive species; cod; predator-prey inter-action;

    Sammanfattning : Invasive species is a worldwide issue that is considered to be the one of the main reasons to losses of biodiversity. The round goby, Neogobius melanostomus, is an invasive species in the Baltic Sea that originates from the Black- and Caspian Sea. LÄS MER

  3. 7. Hur påverkar storskarv (Phalacrocorax carbo) och skäggdopping (Podiceps cristatus) fisksamhället i grunda, näringsrika sjöar?

    Kandidat-uppsats, Linköpings universitet/Biologi

    Författare :Victor Spjern; [2020]
    Nyckelord :Great Cormorant; Great Crested Grebe; diet composition; foraging competition; diving predatory birds; implications from predation; prey size selection; prey species selection;

    Sammanfattning : Piscivorous birds are an integrated part of lake and coastline ecosystems. Despite decades of research it is yet unclear what influence fish eating birds have on the fish community. LÄS MER

  4. 8. Har det skett en förändring i abborrens (Perca fluviatilis) tillväxt i sjön Tåkern mellan år 1978 jämfört med år 2019?

    Kandidat-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Skorsdal Felicia; [2020]
    Nyckelord :Ageing; Body length increment; Cormorant; Competition; European perch; Growth; Perca fluviatilis;

    Sammanfattning : The growth in perch (Perca fluviatilis) is generally slow but varies depending on living conditions. For instance, growth is more rapid in warmer water temperature and when there is reduced intra- and interspecific competition for food. LÄS MER

  5. 9. 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

  7. 10. 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