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Weather driven influences on phytoplankton succession in a shallow lake during contrasting years: Application of PROTBAS
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2007 (English)In: Ecological Modelling, ISSN 0304-3800, E-ISSN 1872-7026, Vol. 207, no 2-4, 128-136 p.Article in journal (Refereed) Published
Abstract [en]

A dynamic model which simulates variations in the biomass of several phytoplankton functional groups (PROTECH) has been reconstructed into the PROTBAS (PROTech Based Algal Simulations) model, and was tested in a large (61 km(2)), shallow (mean depth 3.4 m) windexposed lake basin at the western end of Lake Malaren, Sweden. A subroutine was added to the model to estimate the variation in light extinction resulting from wind action and river discharge. Also the rate of regeneration of nitrogen and silica was modified. The model captured the overall magnitude and succession of phytoplankton during two contrasting years: a warm and calm calibration year, and a cold windy validation year. The model shows good behavior in the northern temperate climate, which includes ice cover during winter. However, there were discrepancies between measured and modeled spring growth and autumn decline of the phytoplankton.

Place, publisher, year, edition, pages
2007. Vol. 207, no 2-4, 128-136 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-93655DOI: 10.1016/j.ecolmodel.2007.04.023ISI: 000250167800005OAI: oai:DiVA.org:uu-93655DiVA: diva2:167196
Available from: 2005-10-28 Created: 2005-10-28 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Climate Effects on Phytoplankton Biomass and Functional Groups
Open this publication in new window or tab >>Climate Effects on Phytoplankton Biomass and Functional Groups
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Future climate in temperate regions is projected to get warmer and in many cases wetter. This poses questions about how phytoplankton in our lakes will respond. A dynamic modeling approach based on an allometric description of phytoplankton characteristics was used to investigate how the biomass of different functional groups of phytoplankton will respond to a changed future climate.

Simulations based on a warmer future climate scenario suggest that we will experience an increase in phytoplankton biomass in northern temperate lakes. Moreover, phytoplankton groups are projected to shift towards a dominance of cyanobacteria at the expense of diatoms.

Climate may affect phytoplankton, either via in-lake changes in temperature and stratification, or due to altered processes at the watershed level, which influence rates of nutrient export and water discharge. This study found that changes in lake temperature and stratification are the major causes of the projected increase in phytoplankton biomass, but that changes in the timing of nutrient export did influence the succession of diatoms.

Variation in SPIM (suspended particulate inorganic matter) can have an important role in influencing the depth of the euphotic zone in a turbid lake, and hence the light climate experienced by phytoplankton. Wind and river discharge were found to regulate SPIM in this study, not only wind as in many other studies. Variations in SPIM could be adequately described by a few governing equations.

This thesis suggests that, as a result of climate change, lakes close to the limit of becoming eutrophied may be pushed past a threshold beyond which water quality problems will become more prevalent. Finally it is important to bear in mind that all models are simplifications of the reality as we understand it. Still, the use of models can often give a good indication as to what might be expected in the future.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 37 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 109
Keyword
Ecology, Climate change, phytoplankton, chlorophyll a, Lake Mälaren, Galten, PROTBAS, numerical modeling, water quality, succession, shallow lake, Ekologi
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-6029 (URN)91-554-6379-7 (ISBN)
Public defence
2005-11-24, Friessalen, Kärnhuset, EBC (Evolutionsbiologiskt centrum), Norbyvägen 18D, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2005-10-28 Created: 2005-10-28 Last updated: 2009-03-30Bibliographically approved

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