4.6 Article

Aquatic metabolism short-term response to the flood pulse in a Mediterranean floodplain

Journal

HYDROBIOLOGIA
Volume 693, Issue 1, Pages 251-264

Publisher

SPRINGER
DOI: 10.1007/s10750-012-1126-9

Keywords

Net ecosystem metabolism (NEP); Ebro River; Linear mixed effects model (LME); River discharge; Phytoplankton; Productivity pump

Funding

  1. Spanish Ministry of Science and Innovation [MICINN CGL2008-05153-C02-01/BOS]
  2. Department of the Environment
  3. Department of the Science, Technology
  4. University-Government of Aragon (Research Group on Ecological Restoration) [E-61, B061-2005]

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The pulsing of river discharge affects biodiversity and productivity of whole river-floodplain ecosystems, triggering the transport, storage and processing of carbon. In this study we investigate the short-term changes in water chemistry and net pelagic metabolism (NEP) in two floodplain lakes in response to a flood pulse. The two oxbow lakes investigated in the floodplain of the Mediterranean Ebro River (NE Spain) showed a clear temporal shift in their metabolic balance, controlled by the river discharge and associated changes in water physical and chemical characteristics. Water chemistry (turbidity, water organic matter, chlorophyll a and nutrients concentration) returned to pre-flood values after 4 days, highlighting the resilience of the ecosystem to flood pulses. Lake NEP was depressed before and during floods to a minimum of -34 mg O-2 m(-3) h(-1), and increased after the flood pulse to a maximum of +463 mg O-2 m(-3) h(-1). The phytoplankton assemblage showed before and after floods a replacement of autotrophic species (e.g. Chlorophyceans) by mixotrophic organisms (e.g. Cryptophyceans, Euglenoids). A linear mixed effects model identified abiotic factors, particularly temperature and river discharge, as significant predictors of the net aquatic metabolism and community respiration during flood conditions. Our results suggest that the role of the Ebro floodplain lakes as sources or sinks of C is complex and relative to the time scale investigated, depending strongly on the river discharge dynamics and the transport of limiting nutrients (phosphorus).

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