Kunzmann, Andreas
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Kunzmann, Andreas
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Kunzmann, Andreas
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Item-typ:Veröffentlichung, Multiple anthropogenic stressors in Indonesia : Impacts on metabolism, spatial distribution and community composition of coral reef organisms(2015-10-21); ; ; Coral reefs in Jakarta Bay (JB) and along the outer Thousand Islands off Jakarta in Indonesia, one of the largest megacities worldwide, are facing extreme environmental pressure by multiple anthropogenic stressors. In this thesis, spatial impacts of stressors as well as physiological responses to pollutants and reduced water quality were determined on coral reef communities. A spatial patchwork of differentially degraded reefs was found along the islands as a result of localized anthropogenic effects rather than regional gradients. Surfactants and diesel-borne compounds are common local pollutants and caused metabolic stress in the fish Siganus guttatus and the scleractinian coral Pocillopora verrucosa. Additional elevated temperature increased stress responses and the complexity of stressors interactions. Furthermore, reduced water quality in JB may control abundance and metabolism of dominant soft corals. This thesis demonstrates that anthropogenic stressors in the JB/Thousand Islands reef complex interact closely. Considering the importance of coral reefs for local livelihoods, improved coral reef management is necessary.Dissertation307 158 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Temperature toleranceof the sea cucumber Holothuria scabra : towards a systematic understanding of multi-level temperature effects(2017-11-07); ; ; The Sea cucumber Holothuria scabra significantly to the release and recycling of nutrients in tropical coastal ecosystems. Besides its fundamental ecological role, the dried body wall of H. scabra, known as Trepang or Beche-de-mer, is ranked among the highest priced global trade commodities from the ocean. The consequential overexploitation of H. scabra brought the artificial rearing of this species in the center of interest, especially in regions of the Global South. Nowadays, H. scabra has become a key species in community-based aquaculture. Temperature is the key environmental factor that determines biological fitness of H. scabra and thus aquaculture production efficiency. Hence, a detailed understanding of temperature effects on H. scabra are important in two different ways: 1) to determine the optimal thermal range and delimiting critical temperature levels for best aquaculture practices; 2) to predict the susceptibility of H. scabra to future global warming scenarios. This thesis aims to provide first insights into a mechanistic understanding of how temperature affects H. scabra at different biological organization levels.Dissertation3370 385