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Parrot feather (Myriophyllum aquaticum) is an amphibious macrophyte with an inducible heterophylly. M. aquaticum plants adapted to the emersed state have leaves with a distinct cuticle and water repellent properties. In contrast M. aquaticum plants adapted to the submerged state have leaves typical for submerged hydrophytes with a strongly reduced cuticle. The aim of the study was to evaluate if this heterophylly of M. aquaticum affects the results of macrophyte biotests. Therefore, the two model substances atrazine and 2,4-dichlorophenoxyacetic acid (2,4-D) were tested each with three M. aquaticum biotests, the only modified parameter being the adaptation time to submergence (0, 7, 28 days).

Impact of heterophylly on the sensitivity of Myriophyllum aquaticum biotests