Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes

Download

Date

2016-10-01

Author

Özkan, Korhan
Davidson, Thomas A.
Bjerring, Rikke
Johansson, Liselotte S.
Sondergaard, Martin
Lauridsen, Torben L.
Svenning, Jens-Christian

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

136
views

0
downloads

A two-decade (1989-2008) time series of lake phyto-and zooplankton, water characteristics and climate in 17 Danish lakes was analysed to examine the long term changes and the effects of lake restoration efforts. The analyses of the pair-wise correlations across time series revealed a strong synchrony in climatic variables among the lakes. A significant, but weak increase in air temperature was observed and resulted in a corresponding increase in surface water temperature only in summer. Lake physico-chemical variables had weaker synchrony than climatic variables. Synchrony in water temperature and stratification was stronger than lake chemistry as the former is mostly affected by atmospheric energy flux. Synchrony in the taxonomic richness of the plankton groups and phytoplankton biomass was apparent, to a similar degree as observed for lake chemistry. The synchrony and the temporal trends in lake chemistry and plankton were more pronounced for the lakes with strong re-oligotrophication. Phytoplankton biomass decreased and plankton richness increased in these lakes, with a shift from Chlorophyta dominance towards more heterogeneous phytoplankton communities. Notably, a widespread significant positive trend in plankton richness was observed not only in lakes with strong re-oligotrophication but across all lakes. The widespread increase in plankton richness coincided with widespread decrease in phosphate and total nitrogen concentrations, as well as with the trends in climate indicating a likely joint effect of nutrient reduction and climate in driving lake plankton. However, temporal changes and synchrony as well as the recovery of richness and composition of lake plankton more coherently corresponded with the nutrient loading reduction across the Danish landscape, while the role of climate control of the lake plankton was less pronounced.

Subject Keywords

Temporal coherence, Zooplankton, Phytoplankton, Re-oligotrophication, Lake recovery, Lake restoration, Plankton diversity

URI

https://hdl.handle.net/11511/31157

Journal

WATER

DOI

https://doi.org/10.3390/w8100427

Collections

Graduate School of Marine Sciences, Article

Suggestions

OpenMETU
Core

Elucidating the patterns in mid-winter waterbird surveys by using climate, lake water level fluctuations and macrophyte records Özgencil, İbrahim Kaan; Beklioğlu, Meryem; Özkan, Korhan; Department of Biology (2017) Impacts of winter climate in Eastern Europe, North Atlantic Oscillation (NAO), water level changes and submerged macrophytes on wintering waterbird community size and structure in three Turkish shallow lakes from three different geographical regions were investigated by using the Mid-Winter Waterbird Survey results from 1967-2016. The study demonstrated that average winter air temperatures in Eastern Europe and combined wintering waterbird community density of the study lakes were negatively correlated. Nor...
Long-term effects of warming and nutrients on microbes and other plankton in mesocosms ÖZEN, ARDA; Sorf, Michal; Trochine, Carolina; Liboriussen, Lone; Beklioğlu, Meryem; Sondergaard, Martin; Lauridsen, Torben L.; Johansson, Liselotte S.; Jeppesen, Erik (Wiley, 2013-03-01) 1.We followed microbial and other planktonic communities during a 4-month period (FebruaryMay) in 12 outdoor flow-through mesocosms designed to elucidate the effect of global warming and nutrient enrichment. The mesocosms were established in 2003. 2.Warming had a smaller effect than nutrients on the biomass of the microbial and planktonic communities, and warming and nutrients together exhibited complex interactions. 3.We did not find direct effects of warming on the biomass of bacterioplankton or ciliates;...
Comparing ecological structure of Turkish shallow lakes between the seasons, and wet & dry years Çağan, Ali Serhan; Beklioğlu, Meryem; Department of Biology (2015) Due to global climate change, lakes in Mediterranean climate face the problem of reduced precipitation and enhanced evaporation along with increased water abstraction for irrigation that are largely causing changes in water level, salinity and nutrient dynamics. In this study 22 Turkish shallow lakes were investigated in the Mediterranean climate zone. All lakes were sampled with a well-established snapshot sampling protocol. There are 19 lakes, which were sampled once during both spring and summer seasons ...
Seismically-triggered organic-rich layers in recent sediments from Gollukoy Lake (North Anatolian Fault, Turkey) Avşar, Ulaş; De Batist, Marc; Lepoint, Gilles; Schmidt, Sabine; Fagel, Nathalie (2014-11-01) Multi-proxy analyses on the sedimentary sequence of Gollukoy Lake, which is located on the eastern North Anatolian Fault (NAF), reveals a complete and high-resolution paleoseismic record for the last 650 years. Six sedimentary events are detected in a 3.1 m-long piston core. They form distinct organic-rich intercalations within the background sedimentation, which are characterized by strong anomalies on the loss-on-ignition (LOI550) and total organic carbon (TOC) profiles, as well as by lighter colours on t...
Seasonal and long-term trends in the spatial heterogeneity of lake phytoplankton communities over two decades of restoration and climate change Fu, Hui; Yuan, Guixiang; Özkan, Korhan; Johansson, Liselotte Sander; Søndergaard, Martin; Lauridsen, Torben L.; Jeppesen, Erik (Elsevier BV, 2020-12-15) World-wide, reducing the external nutrient loading to lakes has been the primary priority of lake management in the restoration of eutrophic lakes over the past decades, and as expected this has resulted in an increase in the local environmental heterogeneity, and thus biotic heterogeneity, within lakes. However, little is known about how the regional spatial heterogeneity of lake biotic communities changes with restoration across a landscape. Using a long-term monitoring dataset from 20 Danish lakes, we el...

Citation Formats

K. Özkan et al., “Long-Term Trends and Temporal Synchrony in Plankton Richness, Diversity and Biomass Driven by Re-Oligotrophication and Climate across 17 Danish Lakes,” WATER, pp. 0–0, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31157.