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Repetitive baselines of phytoplankton succession in an unstably stratified temperate lake (Lake Erken, Sweden): a long-term analysis
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.ORCID iD: 0000-0002-8935-9583
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
2016 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 764, no 1, 211-227 p.Article in journal (Refereed) Published
Abstract [en]

The seasonal development of phytoplankton is a sequence of consecutive events with waxes and wanes of biomass and compositional shifts. This study analyzed 16 years data in Lake Erken, Sweden and revealed four baselines of phytoplankton succession with their underlying drivers. Results showed that there were two diatom-dominated phases annually. The vernal community was dominated by centric diatoms larger than 15 A mu m (functional groups B and C) which were fast-growing diatoms being highly efficient in the use of nutrients. The autumn community was comprised mainly meroplanktonic mixing-dependent Aulacoseira granulata and Fragilaria sp. (MP and P) or/and large centric diatoms (B). Between the two mixing-phases with diatoms, a Gloeotrichia echinulata (H 2) bloom occurred due to its preference for a stratified water column with elevated water temperatures and high light availability. The summer stratification in Lake Erken was weak and short, thus, favoring meroplanktonic diatoms to peak once the lake turned over in early autumn. Lake Erken represents an intermediate case between a highly mixed polymictic lake and a lake with strong summer stratification, where the observed stratification patterns allowed the development of an autumn diatom phase similar, by extent, to the vernal one and mainly dominated by meroplanktonic diatoms.

Place, publisher, year, edition, pages
2016. Vol. 764, no 1, 211-227 p.
National Category
URN: urn:nbn:se:uu:diva-262459DOI: 10.1007/s10750-015-2314-1ISI: 000365727500017OAI: oai:DiVA.org:uu-262459DiVA: diva2:853845
Available from: 2015-09-15 Created: 2015-09-15 Last updated: 2016-01-12Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1292
Phytoplankton dynamics, high-frequency measurements, thermal stratification, water column stability, equilibrium, disturbance
National Category
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)
Available from: 2015-10-09 Created: 2015-09-15 Last updated: 2015-10-29

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