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Climate effects on early phytoplankton biomass over three decades modified by the morphometry in connected lake basins
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
2006 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 559, no 1, 319-329 p.Article in journal (Refereed) Published
Abstract [en]

A 30-year continuous record of chlorophyll a samples in May from six locations in the Swedish Lake Mälaren was tested for the correlation to air temperature, water temperature, precipitation, discharge, nutrients, yellow substance, dissolved phosphorous load, ice cover and NAO (North Atlantic Oscillation) index. In the deep basins subjected to stratification chlorophyll a concentration correlated with air temperature with equal or shorter delay than it did in the shallow basins. Both precipitation and discharge were significant negatively correlated with chlorophyll a concentration in many of the basins with varying retention times. However, discharge into flushed basins had a more immediate influence on chlorophyll a concentration, and precipitation was earlier correlated with chlorophyll a concentration in basins fed from the smaller and closer situated catchment.

Place, publisher, year, edition, pages
2006. Vol. 559, no 1, 319-329 p.
Keyword [en]
climate effect, temperature, precipitation, chlorophyll a, Lake Mälaren
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-93652DOI: 10.1007/s10750-005-1526-1OAI: oai:DiVA.org:uu-93652DiVA: diva2:167193
Available from: 2005-10-28 Created: 2005-10-28 Last updated: 2013-06-13Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 109
Ecology, Climate change, phytoplankton, chlorophyll a, Lake Mälaren, Galten, PROTBAS, numerical modeling, water quality, succession, shallow lake, Ekologi
National Category
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)
Available from: 2005-10-28 Created: 2005-10-28 Last updated: 2009-03-30Bibliographically approved

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