Essays about: "gråsäl"

Showing result 1 - 5 of 8 essays containing the word gråsäl.

  1. 1. Temporal trends of Polybrominated diphenyl ethers (PBDE) and Hexabromocyclododecane (HBCDD) in Swedish Otter (Lutra lutra) and Grey Seals (Halichoerus grypus)

    University essay from Lunds universitet/Centrum för miljö- och klimatvetenskap (CEC)

    Author : Kajsa Frost; [2023]
    Keywords : Polybrominated diphenyl ether; PBDE; BDE; hexabromocyclododecane; HBCDD; Temporal trends; Flame retardants; Baltic grey seal; Halichoerus grypus; Eurasian otter; Lutra lutra; Intestinal ulcers; BDE-47; BDE-99; BDE-100; BDE-153; BDE-154; Earth and Environmental Sciences;

    Abstract : Polybrominated diphenyl ethers (PBDE) and hexabromocyclododecane (HBCDD) are brominated flame retardants. These compounds are lipophilic, persistent and have been shown to bioaccumulate. READ MORE

  3. 2. Development of northern pike (Esox lucius) populations in the Baltic Sea, and potential effects of grey seal (Halichoerus grypus) predation

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Rebecka Svensson; [2021]
    Keywords : diet analysis; ; marine mammals; predator-prey; socio-economic; sport fishing; recreational fisheries;

    Abstract : Worldwide, marine mammal populations are increasing after considerable efforts to turn the downward trends caused by hunting, accidental mortality and pollution. The ecosystem effects from the increases of these top predators may be pronounced, but are in most cases poorly known. READ MORE

  4. 3. Can tourism Seal the deal? : an explorative study on Seal tourism in Sweden

    University essay from SLU/Dept. of Economics

    Author : Ebba Alteg; [2019]
    Keywords : benefits; seals; survey; wildlife tourism; wildlife management;

    Abstract : The increased seal populations in the Swedish coastal areas have resulted in increased damages for fishing companies with associated costs. The negative aspect of seals has been quantified (costs for small-scale fishers) but both negative and positive aspects of natural resources must be considered for politicians to make efficient policy decisions. READ MORE

  5. 4. Attack behavior and presence of grey seals around pots : a search for seal-safe cod-pots in the Baltic sea

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Jasmine Stavenow; [2016]
    Keywords : grey seal; Halichoerus grypus; seal behavior; seal attacks; seal presence; sealsafe; seals-fishery conflict; seals and fishery; fishing gear; cod-pots; sustainable fishing; Baltic sea; coastal fishery;

    Abstract : The seals and the fishery are forced to share the role as top-predators in the Baltic waters since they both depend on the same fish stocks, which leads to an unavoidable competition. Seals are raiding traps, leading not only to costly damaged fishing gears and loss in fish catch but also to the seals themselves getting caught and drowned in the gears as by-catch. READ MORE

  6. 5. Hälsotillståndet hos sälar i Östersjön

    University essay from SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Author : Hanna Lundén; [2012]
    Keywords : gråsäl; Halichoerus grypus; vikare; Phoca hispida botnica; Östersjön; patologi; marina miljöföroreningar;

    Abstract : Sälpopulationerna i Östersjön består av tre arter: gråsäl, vikare och knubbsäl. Sälarna befinner sig som rovdjur högst upp i näringskedjan och livnär sig till största delen på fisk. Detta gör att de i hög grad utsätts för de miljögifter som finns både i vattnet och i fisken. READ MORE