File:Gravier silex flint nodules fonds de la rivière Les baillons à Enquin 02.jpg
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[edit]DescriptionGravier silex flint nodules fonds de la rivière Les baillons à Enquin 02.jpg |
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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Source | Own work |
Author | Lamiot |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:15, 19 August 2017 | ![]() | 4,608 × 2,847 (1.39 MB) | Lamiot (talk | contribs) | User created page with UploadWizard |
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Camera model | COOLPIX W300 |
Exposure time | 1/200 sec (0.005) |
F-number | f/2.8 |
ISO speed rating | 125 |
Date and time of data generation | 16:50, 1 August 2017 |
Lens focal length | 4.3 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 8.0 Windows |
File change date and time | 20:54, 2 August 2017 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.31 |
Date and time of digitizing | 16:50, 1 August 2017 |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 24 mm |
Scene capture type | Standard |
Scene control | None |
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Reference for direction of image | Magnetic direction |
GPS tag version | 0.0.3.2 |
Supported Flashpix version | 1 |
Image width | 4,608 px |
Image height | 2,847 px |
Date metadata was last modified | 22:54, 2 August 2017 |
Unique ID of original document | xmp.did:ECCE48EEB277E711AEDDF678799D3285 |
IIM version | 34,723 |
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