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Modelling nutrient dynamics in a mesocosm fish farming experiment
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
In: Aquaculture, ISSN 0044-8486Article in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-91540OAI: oai:DiVA.org:uu-91540DiVA: diva2:164310
Available from: 2004-03-19 Created: 2004-03-19Bibliographically approved
In thesis
1. Predictive Modelling of Aquatic Ecosystems at Different Scales using Mass Balances and GIS
Open this publication in new window or tab >>Predictive Modelling of Aquatic Ecosystems at Different Scales using Mass Balances and GIS
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents models applicable for aquatic ecosystems. Geographical Information Systems (GIS) form an important part of the thesis. The dynamic mass balance models focus on nutrient fluxes, biotic/abiotic interactions and operate on different temporal and spatial scales (site, local, regional and international). The relevance and role of scale in mass balance modelling is a focal point of the thesis.

A mesocosm experiment was used to construct a model to estimate the nutrient load of phosphorus and nitrogen from net cage fish farming (i.e., the site scale). The model was used to estimate what feeding conditions that are required for a sustainable aquaculture scenario, i.e., a zero nutrient load situation (a linkage between the site scale and the regional scale).

A dynamic model was constructed for suspended particulate matter (SPM) and sedimentation in coastal areas (i.e., the local scale) with different morphometric characteristics and distances to the Sea. The results demonstrate that the conditions in the Sea (the regional and international scale) are of fundamental importance, also for the most enclosed coastal areas.

A foodweb model for lakes was transformed and recalibrated for Baltic Sea conditions (i.e., the international scale). The model also includes a mass balance model for phosphorus and accounts for key environmental factors that regulate the presuppositions for production and biomasses of key functional groups of organisms. The potential use of the new model for setting fish quotas of cod was examined.

For the intermittent (i.e., regional) scale, topographically complex areas can be difficult to define and model. Therefore, an attempt was made to construct a waterscape subbasin identification program (WASUBI). The method was tested for the Finnish Archipelago Sea and the Okavango Delta in Botswana. A comparison to results from a semi-random delineation method showed that more enclosed basins was created with the WASUBI method.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 65 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 957
Earth sciences, mass balance model, dynamic model, scales, marine fish farms, rainbow trout, nutrients, suspended particulate matter, phosphorus, nitrogen, GIS, basin delineation, regionalisation, coastal areas, aquatic foodweb, fishing quotas, Baltic Sea, Archipelago Sea, Okavango Delta, Geovetenskap
National Category
Earth and Related Environmental Sciences
urn:nbn:se:uu:diva-4143 (URN)91-554-5922-6 (ISBN)
Public defence
2004-04-26, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:15
Available from: 2004-03-19 Created: 2004-03-19Bibliographically approved

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