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Hydrobiologia

, Volume 806, Issue 1, pp 13–27 | Cite as

Patterns of microbial food webs in Mediterranean shallow lakes with contrasting nutrient levels and predation pressures

  • Arda Özen
  • Ülkü Nihan Tavşanoğlu
  • Ayşe İdil Çakıroğlu
  • Eti Ester Levi
  • Erik Jeppesen
  • Meryem Beklioğlu
Primary Research Paper
  • 293 Downloads

Abstract

To elucidate the specific and combined effects of bottom-up and top-down control on the microbial community in warm lakes, we sampled microbial community along with physical–chemical and biological variables and performed in situ food web experiments, in 14 Turkish shallow lakes with contrasting nutrient levels and predation pressures. Our field results revealed that differences in microbial communities correlated with differences in zooplankton community structure, temperature (increasing nutrient concentrations, change in zooplankton composition), nutrient concentrations (increasing bacteria and heterotrophic nanoflagellate abundances with increasing nitrogen concentrations and temperature) and macrophyte coverage (ciliates as potential consumers of bacteria and HNF was strongest in macrophyte-dominated lakes). Our in situ experimental study revealed that the zooplankton not only affect the biomass and composition of microbial communities but also alter the microbial structure and trophic relationships. Our results therefore indicate that both bottom-up factors and top-down effects were important for the efficiency of the carbon transfer from bacteria to higher trophic levels in the study lakes. Due to an anticipated increase in eutrophication, temperature and alteration of the classical food web with climate warming, major changes in the microbial community of lakes are, therefore, expected in a warmer future in semi-arid Mediterranean climatic regions.

Keywords

Trophic interactions Bacteria Ciliates Heterotrophic nanoflagellates Zooplankton 

Notes

Acknowledgements

This study and Arda Özen were supported by the METU-DPT ÖYP programme of Turkey (BAP-08-11-DP T-2002-K120510) and by TUBITAK ÇAYDAG (Project Nos: 105Y332, 109Y181 and 110Y125). During the writing-up 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). EEL, ÜNT and AİC were also supported by TÜBITAK ÇAYDAG (Project Nos: 105Y332 and 110Y125), and EJ was supported by CLEAR (a Villum Kann Rasmussen Centre of Excellence project) and The Research Council for Nature and Universe, Denmark (272-08-0406) and CRES. Additionally, EJ and MB were supported by MARS (Managing Aquatic ecosystems and water Resources under multiple Stress, Contract No.: 603378, http://www.mars-project.eu). The authors are grateful to A.M. Poulsen for editing the manuscript and to Korhan Özkan for valuable comments on the manuscript. This study was a part of the PhD dissertation of Arda Özen at the Middle East Technical University.

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© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Department of Forest EngineeringCankiri Karatekin UniversityÇankırıTurkey
  2. 2.Department of Biology, Faculty of ScienceAtatürk UniversityErzurumTurkey
  3. 3.Limnology Laboratory, Department of Biological SciencesMiddle East Technical UniversityÇankayaTurkey
  4. 4.Department of Bioscience and Arctic Research Centre (ARC)Aarhus UniversitySilkeborgDenmark
  5. 5.Sino-Danish Centre for Education and Research (SDC)BeijingChina
  6. 6.Kemal Kurdaş Ecological Research and Training Centre, Lake EymirMiddle East Technical UniversityÇankayaTurkey

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