Sökning: "Decline of top predators"

Hittade 3 uppsatser innehållade orden Decline of top predators.

  1. 1. Change in uptake and transfer of zinc in the food chain when predatory fish disappear from the system

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Sara Westerström; [2023]
    Nyckelord :Aquatic food web; Food chain structure; Trophic transfer; Decline of top predators; Stage-structured biomass model; Pollutants; Heavy metals; Zinc; Akvatisk födoväv; Födovävsstruktur; Trofisk överföring; Minskning av toppredatorer; Stegstrukturerad biomassamodell; Föroreningar; Tungmetaller; Zink;

    Sammanfattning : There is a widespread distribution of possibly toxic heavy metals, such as zinc, in aquatic ecosystems. Simultaneously aquatic food webs are changing due to declining predatory fish stocks. LÄS MER

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

    Master-uppsats, SLU/Dept. Of Aquatic Resources

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

    Sammanfattning : 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. LÄS MER

  4. 3. Disentangling risk in a multi-predator landscape : roe deer respond to differing patterns of risk to lynx, wolves and humans through shifts in their habitat selection

    Master-uppsats, SLU/Dept. of Ecology

    Författare :Andrew Lewis; [2015]
    Nyckelord :Canis lupus; Capreolus capreolus; indirect effects; landscape of fear; Lynx lynx; multi-predator systems; predation risk; Scandinavia; spatial risk patterns; ungulates;

    Sammanfattning : Predation risk is known to evoke behavioural responses in prey animals, and prey are often faced with a trade-off between lowering their risk to predation and acquiring resources. This situation becomes more complex in a multi-predator landscape, especially if those predators employ different hunting strategies, and induce different spatial patterns of risk. LÄS MER