Essays about: "Grey seal"

Showing result 1 - 5 of 15 essays containing the words Grey seal.

  1. 1. Röekillorna unsealed – an osteological analysis of the seal remains at Röekillorna Spring

    University essay from Lunds universitet/Historisk osteologi

    Author : Tea Jahrehorn Önnerfors; [2023]
    Keywords : zooarchaeology; osteological research; offerings-and burial; pinnipedia; grey seals; Neolithic; Iron Age; wetlands; pre-historical Scania; Baltic Sea; Röekillorna Spring; History and Archaeology;

    Abstract : Zooarchaeological studies have played a crucial role in understanding the pre-historic societies of Scania. The analysis of animal remains from archaeological sites has provided insights into the subsistence strategies, economic practices, and cultural beliefs of the people who lived in the region. READ MORE

  3. 2. 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

  4. 3. 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

  5. 4. Trapping efficiency and retention ability of four pontoon trap entrance types for use in coastal cod fishing, a fishing gear development field trial in the Baltic sea

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Nils Nyquist; [2019]
    Keywords : cod; pontoon trap; entrance type; coastal fisheries; video analysis; BORIS;

    Abstract : As the Baltic Sea cod gets smaller both in number and size, and the grey seal population continues to increase, the need for alternative fishing methods in coastal fisheries increases. In this project one commercially used and three experimental pontoon trap entrances are tested with the objective to investigate if there are differences in trapping efficiency and retention ability when fishing for cod. READ MORE

  6. 5. Seal Predation Costs on the Vendace Fishery in the Bothnian Bay : A partial bioeconomic analysis of the economic costs inflicted upon the vendace fishery by seal predation

    University essay from Umeå universitet/Nationalekonomi

    Author : Simon Lindgren; [2019]
    Keywords : ;

    Abstract : This study examines the costs in terms of lost revenues inflicted upon the vendace fishing industry by increased seal predation in the Bothnian Bay between the years of 2008 and 2017. A partial bioeconomic model is used to estimate the costs of predation, where a constant stock management type is assumed. READ MORE