Size-based diel migration of zooplankton in Mediterranean shallow lakes assessed from in situ experiments with artificial plants

Tavsanoglu, Ulku Nihan
Brucet, Sandra
Levi, Eti Ester
Bucak, Tuba
Bezirci, Gizem
Ozen, Arda
Johansson, Liselotte S.
Jeppesen, Erik
Beklioğlu, Meryem
In warm lakes, fish aggregate within macrophytes, thereby weakening the role of these as a daytime refuge for zooplankton and altering the zooplankton size structure, predation pressure, and water clarity. To elucidate the role of macrophytes as a refuge for zooplankton and their effect on zooplankton size distribution, we established three sets of strandardized artificial plant beds in 11 lakes in Turkey with contrasting fish predation risk and turbidity. Zooplankton were sampled within and outside of each plant beds during day and night. Fish, collected overnight in multimesh-sized gillnets, were abundant both inside and outside the artificial plant beds, impoverishing the usefulness of plants as a daytime refuge for particularly large-bodied zooplankton. Zooplankton size diversity was negatively related to fish abundance. Diel vertical migration was the frequent anti-predator avoidance behavior, but reverse migration was also observed when Chaoborus was present. In contrast to the small-bodied taxa, large- and medium-sized taxa showed intraspecific size-based migration (i.e., individuals of different sizes had different migration patterns). Predators influenced the size structure and diel movement of zooplankton, but the response changed with the size of zooplankton and water clarity.


The role of submerged macrophytes in stabilising water clarity and the migration pattern of dominant zooplankton in Lake Eymir, Turkey
Sillah, Mohamed; Beklioğlu, Meryem; Department of Biology (2002)
In this study, samplings within macrophyte beds and open water stations to determine the role of submerged macrophytes in stabilising water clarity and the migration pattern of dominant zooplankton from different habitats in Lake Eymir were carried out. The concentrations of nutrients and suspended solids (SS) were lower within the macrophyte beds than in the open water, while the water clarity was higher within the macrophyte beds than in the open water. The macrophyte beds stabilised the water clarity by ...
The diel vertical distribution of zooplankton in the southeast Black Sea
Erkan, F.; Gücü, Ali Cemal; Zagorodnyaya, J. (2000-01-01)
The diel changes in the vertical distribution of zooplankton in the southeast Black Sea were described in this study. The zooplankton were sampled using two different sampling methods throughout one day in October 1996 and July 1997 at the same station. The zooplankton counts, the length measurements and biomass estimates showed that the zooplankton in the southeast Black Sea is dominated by small organisms, among which Noctiluca scintillans is the dominant species. In the vertical distribution of zooplankt...
Temporal and spatial constraints on community assembly during microbial colonization of wood in seawater
KALENİTCHENKO, Dimitri; Fagervold, Sonja K.; Pruski, Audrey M.; VÉTİON, Gilles; Yücel, Mustafa; LE BRİS, Nadine; Galand, Pierre E. (2015-12-01)
Wood falls on the ocean floor form chemosynthetic ecosystems that remain poorly studied compared with features such as hydrothermal vents or whale falls. In particular, the microbes forming the base of this unique ecosystem are not well characterized and the ecology of communities is not known. Here we use wood as a model to study microorganisms that establish and maintain a chemosynthetic ecosystem. We conducted both aquaria and in situ deep-sea experiments to test how different environmental constraints s...
Temperature effects on body size of freshwater crustacean zooplankton from Greenland to the tropics
Havens, Karl E.; Pinto-Coelho, Ricardo Motta; Beklioğlu, Meryem; Christoffersen, Kirsten S.; Jeppesen, Erik; Lauridsen, Torben L.; Mazumder, Asit; Methot, Ginette; Alloul, Bernadette Pinel; Tavsanoglu, U. Nihan; Erdogan, Seyda; Vijverberg, Jacobus (2015-01-01)
The body size of zooplankton has many substantive effects on the function of aquatic food webs. A variety of factors may affect size, and earlier studies indicate that water temperature may be a particularly important variable. Here we tested the hypothesis that the body size of cladocerans, calanoids, and cyclopoids declines with increasing water temperature, a response documented in an earlier study that considered only cladoceran zooplankton. We tested the hypothesis by comparing body size data that were...
Sediments, not plants, offer the preferred refuge for Daphnia against fish predation in Mediterranean shallow lakes: an experimental demonstration
Tavsanoglu, Ulku Nihan; Cakiroglu, Ayse Idil; Erdogan, Seyda; Meerhoff, Mariana; Jeppesen, Erik; Beklioğlu, Meryem (2012-04-01)
1. Different behavioural responses of planktonic animals to their main predators, fish, have been reported from shallow lakes. In north temperate lakes, large-bodied zooplankton may seek refuge from predation among macrophytes, whereas in subtropical lakes, avoidance of macrophytes has been observed. The prevalent behaviour probably depends on the characteristics of the fish community, which in Mediterranean lakes is typically dispersed in both the open water zone and in the littoral, as in temperate lakes,...
Citation Formats
U. N. Tavsanoglu et al., “Size-based diel migration of zooplankton in Mediterranean shallow lakes assessed from in situ experiments with artificial plants,” HYDROBIOLOGIA, pp. 47–59, 2015, Accessed: 00, 2020. [Online]. Available: