Aarhus University Seal / Aarhus Universitets segl

Erik Jeppesen

Fish but Not Macroinvertebrates Promote Trophic Cascading Effects in High Density Submersed Plant Experimental Lake Food Webs in Two Contrasting Climate Regions

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Documents

DOI

  • Carlos Iglesias, Ctr Univ Reg Este, Dept Ecol & Gest Ambiental, Univ Republ, University of the Republic - Uruguay, CURE Fac Ciencias, Dept Ecol Teor & Aplicada, Univ Republ, University of the Republic - Uruguay, University of the Republic - Uruguay, Funct Ecol Aquat Syst, CURE
  • ,
  • Erik Jeppesen
  • Nestor Mazzeo, Univ Republ, University of the Republic - Uruguay, University of the Republic - Uruguay, Funct Ecol Aquat Syst, CURE
  • ,
  • Juan Pablo Pacheco, Univ Republ, University of the Republic - Uruguay, University of the Republic - Uruguay, Funct Ecol Aquat Syst, CURE
  • ,
  • Franco Teixeira-de Mello, Univ Republ, University of the Republic - Uruguay, University of the Republic - Uruguay, Funct Ecol Aquat Syst, CURE
  • ,
  • Frank Landkildehus
  • Claudia Fosalba, Univ Republ, University of the Republic - Uruguay, University of the Republic - Uruguay, Funct Ecol Aquat Syst, CURE
  • ,
  • Juan M. Clemente, Univ Republ, University of the Republic - Uruguay, University of the Republic - Uruguay, Funct Ecol Aquat Syst, CURE
  • ,
  • Mariana Meerhoff

Predators play a key role in the functioning of shallow lakes. Differences between the response of temperate and subtropical systems to fish predation have been proposed, but experimental evidence is scarce. To elucidate cascading effects produced by predators in contrasting climatic zones, we conducted a mesocosm experiment in three pairs of lakes in Uruguay and Denmark. We used two typical planktivorous-omnivorous fish species (Jenynsia multidentata + Cnesterodon decemmaculatus and Gasterosteus aculeatus + Perca fluviatilis) and one littoral omnivorous-predatory macroinvertebrate (Palaemonetes argentinus and Gammarus lacustris), alone and combined, in numbers resembling natural densities. Fish predation on zooplankton increased phytoplankton biomass in both climate zones, whereas the effects of predatory macroinvertebrates on zooplankton and phytoplankton were not significant in either climate zone. Macroinvertebrates (that freely colonized the sampling devices) were diminished by fish in both climate areas; however, periphyton biomass did not vary among treatments. Our experiments demonstrated that fish affected the structure of both planktonic and littoral herbivorous communities in both climate regions, with a visible positive cascading effect on phytoplankton biomass, but no effects on periphyton. Altogether, fish impacts appeared to be a strong driver of turbid water conditions in shallow lakes regardless of climatic zone by indirectly contributing to increasing phytoplankton biomass.

Original languageEnglish
Article number514
JournalWater
Volume9
Issue7
Number of pages17
ISSN2073-4441
DOIs
Publication statusPublished - Jul 2017

    Research areas

  • omnivorous fish, littoral macroinvertebrates, zooplankton size structure, cascading effects, mesocosm, EUROPEAN MESOCOSM EXPERIMENT, MEDITERRANEAN SHALLOW LAKES, FRESH-WATER LAKES, COMMUNITY STRUCTURE, SUBSTANTIAL DIFFERENCES, CRUSTACEAN ZOOPLANKTON, AQUATIC MACROPHYTES, PLANKTIVOROUS FISH, SUBTROPICAL LAKES, STABLE-ISOTOPE

See relations at Aarhus University Citationformats

Download statistics

No data available

ID: 117211712