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Water level and fish-mediated cascading effects on the microbial community in eutrophic warm shallow lakes: a mesocosm experiment

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Abstract

Information on the effects of water level changes on microbial planktonic communities in lakes is limited but vital for understanding ecosystem dynamics in Mediterranean lakes subjected to major intra- and inter-annual variations in water level. We performed an in situ mesocosm experiment in an eutrophic Turkish lake at two different depths crossed with presence/absence of fish in order to explore the effects of water level variations and the role of top-down regulation at contrasting depths. Strong effects of fish were found on zooplankton, weakening through the food chain to ciliates, HNF and bacterioplankton, whereas the effect of water level variations was overall modest. Presence of fish resulted in lower biomass of zooplankton and higher biomasses of phytoplankton, ciliates and total plankton. The cascading effects of fish were strongest in the shallow mesocosms as evidenced by a lower zooplankton contribution to total plankton biomass and lower zooplankton:ciliate and HNF:bacteria biomass ratios. Our results suggest that a lowering of the water level in warm shallow lakes will enhance the contribution of bacteria, HNF and ciliates to the plankton biomass, likely due to increased density of submerged macrophytes (less phytoplankton); this effect will, however, be less pronounced in the presence of fish.

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Acknowledgments

This study and Arda Özen were supported by a Middle East Technical University grant from the METU-BAP programme of Turkey (BAP-07-02-2009), the METU-DPT ÖYP programme of Turkey (BAP-08-11-DP T-2002-K120510) and by TUBITAK-ÇAYDAĞ (Project nos: 105Y332, 109Y181 and 110Y125). During the writing phase, support was given by FP7-ENV-2009-1, REFRESH (Adaptive strategies to Mitigate the Impacts of Climate Change on European Freshwater Ecosystems, Contract No: 244121) and the MARS project (Managing Aquatic ecosystems and water Resources under multiple Stress) funded under the 7th EU Framework Programme, Theme 6 (Environment including Climate Change), Contract No: 603378 (http://www.mars-project.eu). TB was supported by the TÜBİTAK 2211 Scholarship programme during her graduate study; JC is supported by the TÜBİTAK 2215 Scholarship programme; EEL, ÜNT and AİC were also supported by TÜBITAK ÇAYDAĞ (Project nos: 105Y332 and 110Y125), and EJ was supported by CLEAR (a Villum Kann Rasmussen Centre of Excellence project) and by The Research Council for Nature and Universe, Denmark (272-08-0406), CIRCE and CRES. We also want to thank Gizem Bezirci, Merve Tepe, Betül Acar, Nergis İrem Ertan, Mert Elverici and Soner Oruç for their great efforts during the fieldwork. We thank Anne Mette Poulsen for valuable editorial assistance. This study was a part of the PhD dissertation of Arda Özen at the Middle East Technical University.

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Correspondence to Arda Özen or Meryem Beklioğlu.

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Özen, A., Bucak, T., Tavşanoğlu, Ü.N. et al. Water level and fish-mediated cascading effects on the microbial community in eutrophic warm shallow lakes: a mesocosm experiment. Hydrobiologia 740, 25–35 (2014). https://doi.org/10.1007/s10750-014-1934-1

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