File:Touffes d'algues vertes filamenteuses dans Les Baillons aout2017 a 06.jpg
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Français : Vue subaquatique de touffes d'algues vertes filamenteuses apparaissant ici et là dans un herbier subaquatique d'eau douce apparemment de très belle qualité (ici : Callitriche sp. principalement) 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.
Remarque : 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). Le fond des constitué de graviers silicieux et de rognons de silex. 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. Rem 2 : 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 green filamentous algae in an underwater "freshwater seagrass" well preserved (here: mainly Callitriche sp.) in 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.
Note : Other major botanical species also present in this beautiful ecological habitat were Apium nodiflorum also called Ache nodiflore, Veronica anagallis-aquatica), Stuckenia pectinata, and locally Sparganium erectum, Glyceria plicata and Nasturtium officinale). the bottom consists of siliceous gravel and flint nodules. In 2017 in summer the water was crystalline...in spite a very rainy season ... with little periphyton on the plants and few indications of eutrophication. Note 2 : During my passage I did not see any birds or amphibians or snakes and very few fish (a few trout, no sticklebacks because fish can easily hide in these complex habitat ?) but the flora was really remarkable for the area. Underwater photos taken from the bank (to avoid damaging the environment). |
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| Source | Own work |
| Author | Lamiot |
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