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Climate Effects on Phytoplankton Biomass and Functional Groups
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
2005 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis , 2005. , s. 37
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 109
Nyckelord [en]
Ecology, Climate change, phytoplankton, chlorophyll a, Lake Mälaren, Galten, PROTBAS, numerical modeling, water quality, succession, shallow lake
Nyckelord [sv]
Ekologi
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:uu:diva-6029ISBN: 91-554-6379-7 (tryckt)OAI: oai:DiVA.org:uu-6029DiVA, id: diva2:167198
Disputation
2005-11-24, Friessalen, Kärnhuset, EBC (Evolutionsbiologiskt centrum), Norbyvägen 18D, Uppsala, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2005-10-28 Skapad: 2005-10-28 Senast uppdaterad: 2009-03-30Bibliografiskt granskad
Delarbeten
1. Climate effects on early phytoplankton biomass over three decades modified by the morphometry in connected lake basins
Öppna denna publikation i ny flik eller fönster >>Climate effects on early phytoplankton biomass over three decades modified by the morphometry in connected lake basins
2006 (Engelska)Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 559, nr 1, s. 319-329Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
climate effect, temperature, precipitation, chlorophyll a, Lake Mälaren
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:uu:diva-93652 (URN)10.1007/s10750-005-1526-1 (DOI)
Tillgänglig från: 2005-10-28 Skapad: 2005-10-28 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
2. A dynamic model for flow and wind driven sediment resuspension in a shallow basin
Öppna denna publikation i ny flik eller fönster >>A dynamic model for flow and wind driven sediment resuspension in a shallow basin
2003 (Engelska)Ingår i: Hydrobiologia, Vol. 494, s. 305-311Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93653 (URN)
Tillgänglig från: 2005-10-28 Skapad: 2005-10-28 Senast uppdaterad: 2009-03-30Bibliografiskt granskad
3. Long and short term variations in suspended particulate material: the influence on light available to the phytoplankton community
Öppna denna publikation i ny flik eller fönster >>Long and short term variations in suspended particulate material: the influence on light available to the phytoplankton community
2003 (Engelska)Ingår i: Hydrobiologia, Vol. 494, s. 299-304Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93654 (URN)
Tillgänglig från: 2005-10-28 Skapad: 2005-10-28 Senast uppdaterad: 2009-03-30Bibliografiskt granskad
4. Weather driven influences on phytoplankton succession in a shallow lake during contrasting years: Application of PROTBAS
Öppna denna publikation i ny flik eller fönster >>Weather driven influences on phytoplankton succession in a shallow lake during contrasting years: Application of PROTBAS
2007 (Engelska)Ingår i: Ecological Modelling, ISSN 0304-3800, E-ISSN 1872-7026, Vol. 207, nr 2-4, s. 128-136Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
urn:nbn:se:uu:diva-93655 (URN)10.1016/j.ecolmodel.2007.04.023 (DOI)000250167800005 ()
Tillgänglig från: 2005-10-28 Skapad: 2005-10-28 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
5. Lake phytoplankton response to a future climate scenario – a model approach
Öppna denna publikation i ny flik eller fönster >>Lake phytoplankton response to a future climate scenario – a model approach
(Engelska)Manuskript (Övrig (populärvetenskap, debatt, mm))
Identifikatorer
urn:nbn:se:uu:diva-93656 (URN)
Tillgänglig från: 2005-10-28 Skapad: 2005-10-28 Senast uppdaterad: 2010-01-14Bibliografiskt granskad

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