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  • 1.
    Bergström, Lisa
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Knubbsälen i Kalmarsund2014Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The population of harbor seal in the Baltic Sea is affected by many factors such as over-fishing and benthic dead zones which reduce available food; haul-out sites disturbances which can increase pup mortality; environmental toxins which disturb their hormonal balance and immune system, and the harbor seal population in Kalmar sound has a low genetic variation that makes them vulnerable.

    To be able to observe early changes in the marine environment, it is important to have a survey methodology that is able to detect small changes in the seal population. Although many potential threats, the yearly population surveys shows an increase in the population since the start of the seventies. This thesis will give a background to the factors that might have an effect on the harbor seal population in Kalmar sound, and presents a population survey method with a high statistical power that is able to detect small population changes. The results show that it would take 5-6 years of surveying to detect a 5 percent increase in the population growth of the Kalmar sound harbor seals with a 95 percent statistical probability.

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