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File:Potamot pectiné Stuckenia pectinata dans "Les Baillons" à Enquin-sur-Baillons 04.jpg

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Français : Herbier de Potamot pectiné (Stuckenia pectinata) dans 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 qui est installé sur un fond de gros gravier silicieux comprenant des rognons de silex bruns) étaient - en 2017 - outre ce potamot le Faux Cresson de fontaine (Apium nodiflorum aussi dénommé Ache nodiflore), le Callitriche, la Véronique aquatique (Veronica anagallis-aquatica), 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: Stuckenia pectinata "Les Baillons" (river) à Enquin-sur-Baillons (Canche basin in département Pas-de-Calais (France), here : august 2017.
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Author Lamiot

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