Essays about: "toppredatorer"

Found 5 essays containing the word toppredatorer.

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

    University essay from Uppsala universitet/Institutionen för geovetenskaper

    Author : Sara Westerström; [2023]
    Keywords : 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;

    Abstract : 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. 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. Lodjurets påverkan på skogshöns : en studie om lodjurs indirekta påverkan på skogshöns genom rödräv

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Pontus Nykvist; Elias Wahlberg; [2020]
    Keywords : predation; kaskadeffekter; predator-byten interaktioner;

    Abstract : Lodjursstammen i Sverige har gått från att i princip vara helt utrotad 1920, till en livskraftig population nu 100 år senare. Att toppredatorer har en betydande roll i ekosystem och näringskedjor har bevisats flertalet gånger i olika studier. READ MORE

  5. 4. Probabilistic ecological risk assessment of secondary poisoning from DDT

    University essay from Lunds universitet/Miljövetenskaplig utbildning

    Author : Alice Rundegren; [2019]
    Keywords : probabilistisk riskbedömning; toppredatorer; DDT; diklordifenyltrikloretan; plantskola; skogsplantskola; artkänslighetsfördelning; bioackumulering; förorenad mark; indirekt exponering; Monte Carlo simulering; probabilistic risk assessment; plant nursery; species sensitivity distribution; polluted soil; indirect exposure; bioaccumulation; Monte Carlo simulation; dichlorodiphenyltrichloroethane; Earth and Environmental Sciences;

    Abstract : Although prohibited since decades, dichlorodiphenyltrichloroethane (DDT) and its metabolites still remain in the soil and pose a threat to ecosystems, where especially birds are susceptible to toxic effects. In this thesis, a model developed in the 1990s was used and updated in order to estimate the risks of DDT to top predators at a forest-plant nursery site. READ MORE

  6. 5. Early Campanian mosasaurs (Reptilia; Mosasauridae) from the Kristianstad Basin, southern Sweden

    University essay from Lunds universitet/Geologiska institutionen

    Author : Johan Lindgren; [1998]
    Keywords : Mosasauridae; Clidastes; Platecarpus; Hainosaurus; mosasaur; Cretaceous; Campanian; Kristianstad; Skåne; Sweden; Earth and Environmental Sciences;

    Abstract : Marine strata of latest early Campanian age from the Kristianstad Basin in Skåne, southern Sweden, have yielded a diverse mosasaur fauna comprising four taxa: Clidastes? sp., Platecarpus cf. somenensis, Hainosaurus? ivoensis and Mosasauridae sp. READ MORE