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Fast response of lake plankton and nutrients to river inundations on floodplain lakes

Roozen, F.C.J.M. and Peeters, E.T.H.M. and Roijackers, R. and Wijngaert Van de, I. and Wolters, H. and Coninck de, H. and Ibelings, B.W. and Buijse, A.D. and Scheffer, M. (2008) Fast response of lake plankton and nutrients to river inundations on floodplain lakes. River Research and Applications, 24, 388-406. ISSN 1535-1459.

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Key variables in ecosystems tend to operate on widely different time-scales. These time-scales become relevant when a disturbance rocks the ecosystem. Here we try to explain the fast dynamics of plankton and nutrients in the water column of floodplain lakes after disturbances (inundations). We take advantage of natural experiments, that is occasional massive overflow of floodplain lakes with river water. We sampled 10 lakes in two floodplains along the Dutch river Waal monthly for 3 years, capturing the impact of three inundation events. The inundations reset the plankton as well as chemical composition of most lakes to largely the same state. While biologically inert macro-ion data reflected a large and long lasting impact of the river water, dynamics of nutrients, phytoplankton and zooplankton communities between lakes diverged in a few weeks to regimes characteristic for the different lakes. While one spring inundation synchronized plankton dynamics to let the subsequent clear water phase occur at the same moment in different lakes, winter inundations did not have the same effect and apparently dynamics quickly diverged. Our results showed that effects of inundations and other processes that affect the state of the ecosystem should be studied considering the level of the slow components such as the sediment nutrient pool, fish stock and macrophyte communities. Plankton communities and lake water nutrient status give a practically instantaneous reflection of the condition of these slow components.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:4866
Deposited On:30 Sep 2009 02:00
Last Modified:31 Mar 2014 10:33

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