File:Paysage subaquatique Subaquatic landscape rivière "Les Baillons" à Enquin-sur-Baillons F Lamiot 06.jpg
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[edit]DescriptionPaysage subaquatique Subaquatic landscape rivière "Les Baillons" à Enquin-sur-Baillons F Lamiot 06.jpg |
Français : Paysage subaquatique 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. Sur cette section, le fond principalement constitué de silex bruns est colonisé par de grands herbiers principalement composé (en 2017) de Callitriche, de Faux Cresson de fontaine (Apium nodiflorum aussi dénommé Ache nodiflore), de la Véronique aquatique (Veronica anagallis-aquatica), le Potamot pectiné, localement un Rubanier (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 donnant une idée de ce que "voient les poissons" (imaginer de plus ces plantes ondulant dans le courant, ici assez vif). Photos prises à partir de la berge (pour ne pas perturber le milieu).
English: Underwater landscape of "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. |
Date | |
Source | Own work |
Author | Lamiot |
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current | 16:54, 19 August 2017 | 4,608 × 3,456 (1.66 MB) | Lamiot (talk | contribs) | User created page with UploadWizard |
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Exposure time | 1/80 sec (0.0125) |
F-number | f/2.8 |
ISO speed rating | 125 |
Date and time of data generation | 16:35, 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 | 08:46, 2 August 2017 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.31 |
Date and time of digitizing | 16:35, 1 August 2017 |
Meaning of each component |
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Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
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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 |
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White balance | Auto white balance |
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Focal length in 35 mm film | 24 mm |
Scene capture type | Standard |
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GPS tag version | 0.0.3.2 |
Supported Flashpix version | 1 |
Image width | 4,608 px |
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Date metadata was last modified | 10:46, 2 August 2017 |
Unique ID of original document | xmp.did:81CB9E504E77E711B966C99256A897A7 |
IIM version | 10,807 |