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Water column stability and summer phytoplankton dynamics in a temperate lake (Lake Erken, Sweden)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0002-8935-9583
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2016 (English)In: INLAND WATERS, ISSN 2044-2041, E-ISSN 2044-205X, Vol. 6, no 4, 499-508 p.Article in journal (Refereed) Published
Abstract [en]

Phytoplankton development in aquatic ecosystems is caused by interactions among multiple environmental factors. Physical processes, particularly development of thermal stratification, have been proposed to be important factors for regulating phytoplankton composition and abundance during summer. This study examined the temporal pattern of thermal stratification during summer in Lake Erken, Sweden, based on 21 years of historical data spanning 23 years and investigated the role played by water stability on phytoplankton development. Water column stability indexes were calculated from high frequency measurements during periods of summer thermal stratification. Clustering and ordination analyzed the dissimilarities between communities during different periods and extracted the significant environmental gradients controlling phytoplankton succession. Wind introduced the major external disturbance to Lake Erken during summer and played an important role for the progression of thermocline depth. Species-specific thermal stability preference or tolerance determined the response of individual species to the stratification and constitutes a mechanism of species selection in phytoplankton dynamics. Lake Erken is an unstably stratified lake during summer, caused by wind-induced turbulence and internal seiches. Adaptation to these unstable conditions is the major determinant of phytoplankton dynamics. Hydrodynamic variability, characterized by different stability indexes in early, mid, and late summer, was the key factor regulating phytoplankton dynamics, directly by changing phytoplankton distribution and indirectly by altering both the light and nutrient availability in the epilimnion.

Place, publisher, year, edition, pages
2016. Vol. 6, no 4, 499-508 p.
Keyword [en]
Gloeotrichia echinulata, hydrodynamics, Lake Analyzer, phytoplankton dynamics, succession, thermal stratification and mixing
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-262451DOI: 10.5268/IW-6.4.874ISI: 000388608700003OAI: oai:DiVA.org:uu-262451DiVA: diva2:853838
Available from: 2015-09-15 Created: 2015-09-15 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Phytoplankton and Physical Disturbance: Seasonal dynamics in temperate Lake Erken, Sweden
Open this publication in new window or tab >>Phytoplankton and Physical Disturbance: Seasonal dynamics in temperate Lake Erken, Sweden
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Phytoplankton mirrors changes in the environment and plays an important role in biogeochemical processes. Phytoplankton dynamics is the outcome of both autogenic succession and external disturbances. This thesis focused on the seasonal variation of water column stability and its effects on phytoplankton, particularly considering the influence of mixing events on phytoplankton development. Lake Erken is a dimictic lake with weak and often interrupted summer stratification, which represents an intermediate case between a polymictic lake and a lake with strong summer stratification.

There are two diatom phases annually. The spring bloom is caused by pioneer centric diatoms, and the autumn diatom phase is dominated by meroplanktonic diatoms induced by turnover. A summer Cyanobacteria bloom – mainly Gloeotrichia echinulata, depended on the length and stability of stratification.

Winter and spring air temperature is found to play an important role in the annual succession of phytoplankton by initiating changes in ice/snow-cover and lake thermal stability and setting the basic status. Instead of starting from zero, the vernal phytoplankton piles up on the overwintering community, this trans-annual ecological memory influences both the composition and diversity and taxonomic distinctness of spring phytoplankton.

Water column stability during summer in Lake Erken is mainly influenced by wind-induced turbulence and internal seiches. As thermal stratification develops from early until late summer, variations in stability and gradual deepening of the thermocline depth influence phytoplankton dynamics directly by changing its distribution, and also indirectly by altering the nutrient and light availability. A new disturbance index (DI) was defined to quantify environmental stability/disturbance and tested well to indicate phytoplankton equilibrium status in two summer stratification periods. The concept of species and functional groups was generally used in this study. However, a next generation sequencing based approach was also tested and proved to provide an excellent candidate for revealing distribution patterns of phytoplankton in inland waters.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2015. 43 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1292
Keyword
Phytoplankton dynamics, high-frequency measurements, thermal stratification, water column stability, equilibrium, disturbance
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-262461 (URN)978-91-554-9345-5 (ISBN)
Public defence
2015-11-06, Friessalen, Evolutionary Biology Center, Norbyvägen 14, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2015-10-09 Created: 2015-09-15 Last updated: 2015-10-29

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Yang, YangColom-Montero, WilliamPierson, DonPettersson, Kurt

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