File:Corbicules Sèvre niortaise Pont romain d'Azay-le-Brûlé.jpg
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[edit]DescriptionCorbicules Sèvre niortaise Pont romain d'Azay-le-Brûlé.jpg |
Français : Corbicules ici photographié (en aout 2016) dans une zone active d'encroutement minéral (d'origine algale et ou bactérienne) dans la rivière "Sèvre niortaise", dans une partie peu profonde et bien éclairée, au lieu dit "Pont romain d'Azay-le-Brûlé" (France).
Sur ces encroûtements des gammares et de nombreux w:Theodoxus peuvent être observés en train de se nourrir. Cette section du cours d'eau est riche en zones d'encroutement qui s'y forment généralement à partir de tapis horizontaux de mousses aquatiques (bryophytes) ou de tapis verticaux de Marchantiophyta. Certains encroutements épais se sont formés sur du fil de pêche, il sont donc récents. Remarque : Aucun encroûtement très épais (de plus de quelques cm d'épaisseur) n'est observé sur les piles du pont médiéval ni sur des roches a priori anciennes, ce qui laisse penser que le phénomène est récent. Autre remarque : les encroutements ne se sont pas sur les plombs de pêche (toxiques et écotoxiques) ni - semble-t-il sur certaines roches ni sur les morceaux de bois morts (à confirmer par une observation plus attentive). Les coquilles de theodoxus sont parfois recouverts d'encroutements (jusqu'à plus de 1 mm d'épaisseur). Depuis quelques années, le cours d'eau est également densément colonisé par des corbicules, probablement au détriment des unionidae (grandes moules d'eau douce) English: Corbicula here photographed in a mineral encrustation active area (algal and or bacterial origin) photographed (in August 2016) on the bottom of the river "Sèvre Niortaise" in a shallow and well lit place, called "Roman Bridge of Azay-le-Brûlé "(France).
On these crusts various invertebrates, including gammares and many w:Theodoxus can be observed. This section of the river is rich in crusting areas that typically form it from horizontal carpet aquatic of mosses (bryophyta) or vertical carpet of Marchantiophyta. Note: Not very thick crust (more than a few cm thick) are found on the battery or the medieval bridge on rocks a priori old, suggesting that the phenomenon is recent. Another note: the crusts are not on lead sinkers (metal toxic and Ecotoxical) neither on some rocks or on pieces of dead wood (to be confirmed by more attentive observations). |
Date | |
Source | Own work |
Author | Lamiot |
Camera location | 46° 22′ 41.6″ N, 0° 15′ 27.09″ W ![]() ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 07:30, 10 August 2016 | ![]() | 4,608 × 3,456 (6.46 MB) | Lamiot (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | NIKON |
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Camera model | COOLPIX AW120 |
Exposure time | 1/200 sec (0.005) |
F-number | f/2.8 |
ISO speed rating | 125 |
Date and time of data generation | 13:08, 8 August 2016 |
Lens focal length | 4.3 mm |
Latitude | 46° 22′ 41.6″ N |
Longitude | 0° 15′ 27.09″ W |
Image title | |
Width | 4,608 px |
Height | 3,456 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CC 2015 (Windows) |
File change date and time | 20:46, 8 August 2016 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 13:08, 8 August 2016 |
Meaning of each component |
|
Image compression mode | 4 |
APEX shutter speed | 7.643856 |
APEX aperture | 2.970854 |
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 |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Macro |
GPS time (atomic clock) | 11:54 |
Satellites used for measurement | 12 |
Reference for direction of image | True direction |
Direction of image | 55.44 |
Geodetic survey data used | WGS-84 |
GPS date | 8 August 2016 |
GPS tag version | 0.0.3.2 |
Date metadata was last modified | 22:46, 8 August 2016 |
Unique ID of original document | 0B82B7375E928351A6F5F6C89BB2BEFD |
IIM version | 24,576 |