Essays about: "baltic sea area"

Showing result 21 - 25 of 122 essays containing the words baltic sea area.

  1. 21. Västergarn Boat Rivets in Context : Case Study : The Missing Boatyard

    University essay from Uppsala universitet/Arkeologi

    Author : Richard Koehler; [2020]
    Keywords : Marine craft; boatyard; WBS; supply-chain; Knärr; Cig; boat; ship; maritime community; interdisciplinary;

    Abstract : Gotland has a rich material cultural heritage from the Stone Age to the Middle Ages thanks to the island's strategic location in the middle of the Baltic Sea; especially true for the Viking Age when Gotlanders had extensive trade contacts with the east dating from the mid 12th century and Gotland’s economy was dominated by such contacts. This essay deals with Gotland's maritime infrastructure and its development between about 1100 and 1400 based on a case study of boat rivets from the medieval settlement of Västergarn. READ MORE

  3. 22. Invasive round goby, Neogobius melanostomus - suitable prey for native cod, Gadus morhua?

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Andreas Ljung; [2020]
    Keywords : Round goby; invasive species; cod; predator-prey inter-action;

    Abstract : Invasive species is a worldwide issue that is considered to be the one of the main reasons to losses of biodiversity. The round goby, Neogobius melanostomus, is an invasive species in the Baltic Sea that originates from the Black- and Caspian Sea. READ MORE

  4. 23. Nitrogen runoff, constructed wetlands and the effect on catch of fish in the Öresund strait

    University essay from Lunds universitet/Miljövetenskaplig utbildning

    Author : Saga Hedstigen Sundblad; [2020]
    Keywords : seafloor oxygen demand; fish catch; constructed wetland; Earth and Environmental Sciences;

    Abstract : Eutrophication and low dissolved oxygen levels are spreading all over the world, causing changes in fish distribution and decline in fish abundance and catch of fish. This study assesses the current nitrogen (N) surface runoff to the Öresund strait, the seafloor oxygen demand it cause, the subsequent effect on fish catch, and the constructed wetland area needed to retain current N loads. READ MORE

  5. 24. Influence of reed (Phragmites australis) belts in the Baltic Sea archipelago on pike (Esox lucius) and other coastal fish species

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Niklas Niemi; [2020]
    Keywords : Reed; Phragmites; Pike; Baltic Sea; spatial distribution; habitat utilization; reed expansion; reed management;

    Abstract : Eutrophication, near shore building and human disturbances by dredging and shore alteration have led to increased expansion of the common reed (Phragmites australis) in the archipelago of the Baltic Sea. Reed has an important ecological function such as nursery habitat for many fish species. READ MORE

  6. 25. European perch (Perca fluviatilis) as a possible predator of the invasive round goby (Neogobius melanostomus) in the Baltic Sea

    University essay from SLU/Dept. Of Aquatic Resources

    Author : Mari-Helen Westlund; [2020]
    Keywords : Baltic Sea; invasive species; Round goby; Perch; prey-predator interaction;

    Abstract : Invasive species is a global issue with a strong link to reduced biodiversity and large economic costs. The invasive fish species round goby (Neogobius melanostomus) is one of the species that are spreading in the Baltic Sea area most rapidly, and risk causing major issues. READ MORE