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

Date

2018-01-01

Author

ÖZEN, ARDA
Tavsanoglu, Ulku Nihan
Cakiroglu, Ayse Idil
Levi, Eti Ester
Jeppesen, Erik
Beklioğlu, Meryem

Metadata

Show full item record

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

Item Usage Stats

145
views

0
downloads

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.

Subject Keywords

Trophic interactions, Zooplankton, Heterotrophic nanoflagellates, Ciliates, Bacteria

URI

https://hdl.handle.net/11511/43670

Journal

HYDROBIOLOGIA

DOI

https://doi.org/10.1007/s10750-017-3329-6

Collections

Department of Biology, Article

Suggestions

OpenMETU
Core

Patterns of Seasonal Stability of Lake Phytoplankton Mediated by Resource and Grazer Control During Two Decades of Re-oligotrophication Fu, Hui; Yuan, Guixiang; Özkan, Korhan; Johansson, Liselotter Sander; Sondergaard, Martin; Lauridsen, Torben L.; Jeppesen, Erik (Springer Science and Business Media LLC, 2020-09-01) Human-induced changes in external nutrient loading affect the phytoplankton community and abundance directly by changing the amount of nutrients available, but also indirectly through changes in the zooplankton (that is, grazer) community structure, mediated in part by changes in the fish community structure and biomass. Such shifts affect the species dynamics and community succession of lake phytoplankton communities, and they may ultimately influence community stability. However, the relative importance o...
Changes of Eutrofication Indicator Parameters (TP, DIN, Chl-a and TRIX) in the Cilician Basin (Northeast Mediterranean) TUĞRUL, SÜLEYMAN; Uysal, Zahit; Erdogan, Emine; Yucel, Nebil (2011-01-01) Eutrophication processes and changes in coastal ecosystem are determined by the coastal/open sea interactions and rates of nutrient pollution. The Cilician Basin shelf waters are affected not only by intense industrial activities and increased population, but also by complex atmosphere-sea-land interactions. There is a recognizable difference between water qualities of Mersin bay coastal and the Cilician open waters depleted in nutrients. Eutrophic conditions have developed in the eastern bay shallow waters...
Quantification of the Synergistic Effects of Eutrophication, Apex Predator Pressure, and Internal Processes on the Black Sea Ecosystem Salihoğlu, Barış (2013-12-01) In the present study, a model of the lower-trophic pelagic food web of the Black Sea is considered in order to provide a quantitative understanding of the marked changes in the food web structure in response to changing top-down and bottom-up control mechanisms due to eutrophication, overfishing, and climatic changes. The simulations consider three particular parameters controlling the changes in the ecosystem structure due to these stressors; (i) the magnitude of the nitrate flux into the euphotic layer fr...
Monthly changes in primary and bacterial productivity in the North – Eastern Mediterranean shelf waters Yücel, Nebil; Uysal, Zahit; Department of Marine Biology and Fisheries (2013) Within the context of this thesis, it was aimed to compare monthly changes in primary and bacterial production rates of eutrophic shelf waters with those of nutrient impoverished oligotrophic open waters taking into consideration of ambient physicochemical properties of the basin waters. In addition, size fractionated primary production and limiting nutrient experiments were also carried out. To achieve these goals, a total of 25 cruises were realized on board R/V Bilim-2 of IMS-METU to collect biological (...
Effects of warming and nutrients on the microbial food web in shallow lake mesocosms Zingel, Priit; Cremona, Fabien; Noges, Tiina; Cao, Yu; Neif, Erika M.; Coppens, Jan; Iskin, Ugur; Lauridsen, Torben L.; Davidson, Thomas A.; Sondergaard, Martin; Beklioğlu, Meryem; Jeppesen, Erik (Elsevier BV, 2018-06-01) We analysed changes in the abundance, biomass and cell size of the microbial food web community (bacteria, heterotrophic nanoflagellates, ciliates) at contrasting nutrient concentrations and temperatures during a simulated heat wave. We used 24 mesocosms mimicking shallow lakes in which two nutrient levels (unenriched and enriched by adding nitrogen and phosphorus) and three different temperature scenarios (ambient, IPCC A2 scenario and A2+%50) are simulated (4 replicates of each). Experiments using the mes...

Citation Formats

A. ÖZEN, U. N. Tavsanoglu, A. I. Cakiroglu, E. E. Levi, E. Jeppesen, and M. Beklioğlu, “Patterns of microbial food webs in Mediterranean shallow lakes with contrasting nutrient levels and predation pressures,” HYDROBIOLOGIA, pp. 13–27, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/43670.