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Erik Jeppesen

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

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  • Ulku Nihan Tavsanoglu, Middle E Tech Univ, Orta Dogu Teknik University, Dept Biol, Limnol Lab
  • ,
  • Sandra Brucet Balmana
  • ,
  • Eti Ester Levi, Middle E Tech Univ, Orta Dogu Teknik University, Dept Biol, Limnol Lab
  • ,
  • Tuba Bucak, Middle E Tech Univ, Orta Dogu Teknik University, Dept Biol, Limnol Lab
  • ,
  • Gizem Bezirci, Middle E Tech Univ, Orta Dogu Teknik University, Dept Biol, Limnol Lab, Denmark
  • Arda Ozen, Cankiri Karatekin Univ, Cankiri Karatekin University, Dept Forest Engn, Denmark
  • Liselotte S. Johansson
  • Erik Jeppesen
  • Meryem Beklioglu, Middle E Tech Univ, Orta Dogu Teknik University, Kemal Kurdas Ecol Training Stn, Lake Eymir

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.

Original languageEnglish
JournalHydrobiologia
Volume753
Issue1
Pages (from-to)47-59
Number of pages13
ISSN0018-8158
DOIs
Publication statusPublished - Jul 2015

    Research areas

  • Zooplankton community structure, Migration, Predation size diversity, Water clarity, FISH COMMUNITY STRUCTURE, TOP-DOWN CONTROL, VERTICAL MIGRATION, INVERTEBRATE PREDATORS, HORIZONTAL MIGRATION, SPECIES-DIVERSITY, NUTRIENT STATE, CHLOROPHYLL-A, BODY-SIZE, DAPHNIA

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