File:Gravier silex flint nodules fonds de la rivière Les baillons à Enquin 04.jpg

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Français : Substrat du fond (constitué de graviers silicieux et de rognons de silex) de la rivière "Les Baillons" à Enquin-sur-Baillons, dans le Bassin de la Canche, dans le département du Pas-de-Calais (France), ici en aout 2017.
Les principales plantes aquatiques de cet herbier sont en 2017 le Faux Cresson de fontaine (Apium nodiflorum aussi dénommé Ache nodiflore), la Véronique aquatique (Veronica anagallis-aquatica), le Potamot pectiné, localement le Rubanier dressé (Sparganium erectum), une glycérie (Glyceria plicata) et sur berge le cresson de fontaine (aussi dit « officinal » (Nasturtium officinale). En 2017 en été l'eau était cristalline ; même en période très pluvieuse ... avec peu de périphyton sur les plantes et peu d'indices d'eutrophisation (algues filamenteuses localement). Durant mon passage je n'y ai pas vu d'oiseaux ni amphibiens ou couleuvres et très très peu de poissons (quelques truites, pas d'épinoches, mais les poissons peuvent se cacher facilement dans ces herbiers), mais la flore était vraiment remarquable pour la région. Photo subaquatique prises à partir de la berge (pour ne pas perturber le milieu).
English: Underwater view of the bottom of the river "The Baillons" in Enquin-sur-Baillons in the basin of the Canche in the department of Pas-de -Calais (France), here in August 2017. The bottom consists of siliceous gravel and flint nodules
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current16:15, 19 August 2017Thumbnail for version as of 16:15, 19 August 20176,000 × 881 (772 KB)Lamiot (talk | contribs)User created page with UploadWizard

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