Search for dissertations about: "over-exploitation"

Showing result 1 - 5 of 6 swedish dissertations containing the word over-exploitation.

  2. 1. Coral Reef Habitats and Fish Connectivity : Implications for coastal management and fishery

    Author : Tove Lund Jörgensen; Michael Tedengren; Nick Graham; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; anthropogenic disturbance; coral reef habitat; fish community; coastal ecosystems; conservation management; spatial ecology; seascape perspective; holistic approach; marin ekotoxikologi; Marine Ecotoxicology;

    Abstract : Coral reefs have one of the highest levels of biodiversity of all ecosystems in the world and are important for both human livelihood and food security throughout many tropical countries. However, due to increased anthropogenic pressure on marine ecosystems, especially during the last couple of decades, coral reefs have become critically over-fished, and many reefs are now in a degraded state and are facing additional future threats due to further over-exploitation, chemical pollution, sedimentation, and effects of climate change. READ MORE

  4. 2. Shell Age Economics : Marine Gathering in the Kingdom of Tonga, Polynesia

    Author : Thomas Malm; Humanekologi; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; chieftainship; cosmology; demography; marine tenure systems; tragedy of the commons ; seaweeds; marine invertebrates; gender roles; indigenous knowledge; maritime anthropology; Tongans; Tonga; Oceania; Polynesia; totemism; Cultural anthropology; ethnology; Kulturantropologi; etnologi;

    Abstract : This monograph analyses marine gathering in the Polynesian Kingdom of Tonga from ecological, social and cognitive perspectives. The overarching issues explored are (1) the significance of marine gathering in the past and present, (2) how seaweeds and marine invertebrates have been perceived, classified, named and used, (3) how they have been implicated in social relations, and (4) how the integration of the islands into the modern world system has affected the marine environment and the exploitation of its resources. READ MORE

  5. 3. Ecotoxicological studies on giant clams (Tridacnidae) : Environmental problems and future concerns

    Author : Eva Blidberg; Michael Tedengren; David Klumpp; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; giant clam; larval; physiology; zooxanthellae; Biology; Biologi;

    Abstract : Giant clams (Tridacnidae; Bivalvia) are described as important framework builders on coral reefs in the Indo-Pacific region. They are phototrophic as they are associated with primary producing zooxanthellae. Populations are low due to over-exploitation and most species are now endangered in many areas. READ MORE

  6. 4. Immersed flat-sheet membrane bioreactors for lignocellulosic bioethanol production

    Author : Amir Mahboubi; Huu Hao Ngo; Högskolan i Borås; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lignocellulosic bioethanol; immersed membrane bioreactor; membrane fouling; reverse membrane bioreactor; Resource Recovery; Resursåtervinning;

    Abstract : The rising awareness of the environmental, economic and socio-political impacts of over-exploitation of fossil-based fuel and energy sources, have motivated the transition toward more sustainable and renewable energy sources. Lignocellulosic materials (e.g. READ MORE

  7. 5. Modelling Freshwater-Seawater Interactions in Coastal Aquifers : Long-term Trends and Temporal Variability Effects

    Author : Carmen Prieto; KTH; []
    Keywords : seawater intrusion; seasonal variability; artificial recharge; spatial and temporal randomness;

    Abstract : Over-exploitation of coastal aquifers causes seawaterintrusion and eventually contamination of groundwater wells inmany parts of the world. Desalination of brackish water andartificial recharge of treated wastewater may then be asustainable strategy for managing groundwater supply inwater-stressed regions. READ MORE