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

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• 作者：A. Liess ; O. Rowe ; S. N. Francoeur ; J. Guo ; K. Lange ; A. Schröder…
• 关键词：Bacteria ; Dissolved organic carbon (DOC) ; Mesocosm experiment ; Phytoplankton ; Nutrient subsidy ; Terrestrial subsidy
• 刊名：Hydrobiologia
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：766
• 期：1
• 页码：275-291
• 全文大小：853 KB
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• 作者单位：A. Liess (1) (2)
  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. Department of Ecology and Environmental Sciences, Umeå Universitet, 901 87, Umeå, Sweden
  2. Laboratoire Ecosystèmes Marins Côtiers, UMR5119 CNRS, Université Montpellier2, IRD, IFREMER, Paris, France
  3. Department of Food and Environmental Sciences, Division of Microbiology and Biotechnology, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland
  4. Department of Biology, Eastern Michigan University, 48197, Ypsilanti, MI, USA
  5. Department of Zoology, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand
  6. Department of Fish Ecology and Evolution, EAWAG, 6047, Kastanienbaum, Switzerland
  7. Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
  8. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, Müggelseedamm 310, 12587, Berlin, Germany
  9. Marine Stewardship Council, Marine House, 1 Snow Hill, London, EC1A 2DH, UK
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5117

文摘

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