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Importance of fish community structure, nutrients and browning for shallow lake ecosystem dynamics: A modelling perspective
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Biology Education Centre. IceLab - Interdisciplinary Science Lab, Umeå universitet.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

In a changing climate, it is increasingly important to be able to model environmental effects on food webs, and to do that, one must have appropriate dynamic models. I present a shallow lake ecosystem model where producers, grazers, carnivores, piscivores, and detritivores are coupled through resource (light, nutrients and detritus) fluxes between the benthic and pelagic habitats and through carnivore life history events (ontogenetic habitat and diet shifts). The two habitats each contain primary producers, grazers, carnivores and detritivores. Within the habitats, there is strong top-down regulation, but across habitat boundaries, bottom-up interactions drive production. In the absence of piscivores, stage-structured carnivores cause intriguing patters of alternative stable states. Notably, the model predicts a lesser dependence on benthic production with detritus presence. Model predictions are largely in agreement with empirical studies. The results have implications for management of freshwater, and for the interpretation of previous models.

Place, publisher, year, edition, pages
2019. , p. 23
Keywords [en]
biological modelling, bowning, food webs, trophic interactions, top-down and bottom-up control, nutrients, light, shallow lake
Keywords [sv]
biologisk modellering, brunifiering, födovävar, trofiska interaktioner, näring, ljus, grund sjö
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-379113OAI: oai:DiVA.org:uu-379113DiVA, id: diva2:1295539
Educational program
Master Programme in Biology
Supervisors
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Available from: 2019-05-02 Created: 2019-03-12 Last updated: 2019-05-02Bibliographically approved

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CiteExportLink to record
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  • apa
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