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Hydrobiologia

, Volume 766, Issue 1, pp 275–291 | Cite as

Terrestrial runoff boosts phytoplankton in a Mediterranean coastal lagoon, but these effects do not propagate to higher trophic levels

  • A. LiessEmail author
  • O. Rowe
  • S. N. Francoeur
  • J. Guo
  • K. Lange
  • A. Schröder
  • B. Reichstein
  • R. Lefèbure
  • A. Deininger
  • P. Mathisen
  • C. L. Faithfull
Primary Research Paper

Abstract

Heavy rainfall events causing significant terrestrial runoff into coastal marine ecosystems are predicted to become more frequent with climate change in the Mediterranean. To simulate the effects of soil runoff on the pelagic food web of an oligotrophic Mediterranean coastal lagoon, we crossed soil extract addition (increasing nutrient availability and turbidity) and fish presence in a full factorial design to coastal mesocosms containing a natural pelagic community. Soil extract addition increased both bacteria and phytoplankton biomass. Diatoms however profited most from soil extract addition, especially in the absence of fish. In contrast zooplankton and fish did not profit from soil extract addition. Furthermore, our data indicate that nutrients (instead of light or carbon) limited basal production. Presumed changes in carbon availability are relatively unimportant to primary and secondary production in strongly nutrient limited systems like the Thau Lagoon. We conclude that in shallow Mediterranean coastal ecosystems, heavy rainfall events causing soil runoff will (1) increase the relative abundance of phytoplankton in relation to bacteria and zooplankton, especially in the absence of fish (2) not lead to higher biomass of zooplankton and fish, possibly due to the brevity of the phytoplankton bloom and the slow biomass response of higher trophic levels.

Keywords

Bacteria Dissolved organic carbon (DOC) Mesocosm experiment Phytoplankton Nutrient subsidy Terrestrial subsidy 

Notes

Acknowledgments

We thank G. Thomsson, T. Bayer, and W. Uszko for help in field and laboratory. B. Mostajir, R. Pete, F. Vidussi, E. Le Floc’h, S. Mas and T. Dinet at the MEDIMEER mesocosm facility provided technical support. Thanks to A.P. Rowe for language editing. This research received funding from the European Union Seventh Framework Program (FP7/2007–2013) under Grant agreement n° 228224, MESOAQUA and through a grant by the Oscar and Lili Lamms Minnes Stiftelse as well as through a Young Researchers Award to AL.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • A. Liess
    • 1
    • 2
    Email author
  • O. Rowe
    • 1
    • 3
  • S. N. Francoeur
    • 4
  • J. Guo
    • 1
  • K. Lange
    • 5
    • 6
  • A. Schröder
    • 7
    • 8
  • B. Reichstein
    • 1
  • R. Lefèbure
    • 1
    • 9
  • A. Deininger
    • 1
  • P. Mathisen
    • 1
  • C. L. Faithfull
    • 1
  1. 1.Department of Ecology and Environmental SciencesUmeå UniversitetUmeåSweden
  2. 2.Laboratoire Ecosystèmes Marins CôtiersUMR5119 CNRS, Université Montpellier2, IRD, IFREMERParisFrance
  3. 3.Department of Food and Environmental Sciences, Division of Microbiology and Biotechnology, Viikki Biocenter 1University of HelsinkiHelsinkiFinland
  4. 4.Department of BiologyEastern Michigan UniversityYpsilantiUSA
  5. 5.Department of ZoologyUniversity of OtagoDunedinNew Zealand
  6. 6.Department of Fish Ecology and EvolutionEAWAGKastanienbaumSwitzerland
  7. 7.Faculty of Biological SciencesUniversity of LeedsLeedsUK
  8. 8.Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of FishesBerlinGermany
  9. 9.Marine Stewardship Council, Marine HouseLondonUK

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