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Allelopathic effect of the aquatic macrophyte, Stratiotes aloides, on natural phytoplankton

Mulderij, G. and Mau, B. and Smolders, A.J.P. and Van Donk, E. (2006) Allelopathic effect of the aquatic macrophyte, Stratiotes aloides, on natural phytoplankton. Freshwater Biology, 51, 554-561. ISSN 0046-5070.

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Official URL: http://dx.doi.org/10.1111/j.1365-2427.2006.01510.x

Abstract

A survey of different Dutch Stratiotes stands showed that the density of phytoplankton (except cyanobacteria) was always higher outside S. aloides than between the rosettes of S. aloides. Analyses of water samples revealed that nutrient limitation was unlikely to have caused the lower phytoplankton biomass in the vicinity of S. aloides. 2. An in situ incubation experiment in the Danube Delta, Romania, indicated allelopathic activity against phytoplankton in S. aloides stands. The growth rate of natural phytoplankton populations exposed to water from S. aloides stands was significantly lower than that of populations that had not been in contact with S. aloides exudates. 3. A laboratory microcosm experiment showed a significantly lower phytoplankton biomass in treatments with S. aloides exudates. Nutrient concentrations and the light intensity were high enough that the lower phytoplankton biomass could not be explained by nutrient or light limitation. [KEYWORDS: allelopathy ; exudates ; field experiment ; infochemical ; natural phytoplankton]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11997
Deposited On:23 Nov 2011 01:00
Last Modified:24 Apr 2012 16:31

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