20260627 08264400 1.0 TRUE Le relevé des macrophytes du Rhône vient compléter les relevés similaires effectués périodiquement dans le lac Léman et permet d'approfondir les connaissances sur la biologie du fleuve.<br /><br />Les macrophytes sont des plantes aquatiques qui constituent d'excellents indicateurs de l'état du milieu et leur présence est indispensable pour de nombreuses espèces animales. 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