File:Drosera à feuilles ovales (Drosera x obovata) dans les Hautes-Vosges - Cliché Vosagus 28-06-2009.JPG
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[edit]DescriptionDrosera à feuilles ovales (Drosera x obovata) dans les Hautes-Vosges - Cliché Vosagus 28-06-2009.JPG |
Français : Le Droséra à feuilles ovales (Drosera x obovata) est une plante insectivore des tourbières de l'hémisphère nord, photographié ici sur la tourbière tremblante de Lispach dans les Hautes-Vosges, France.
Cet hybride naturel de Drosera rotundifolia et de Drosera anglica est plus vigoureux que les 2 espèces parentes en compagnie desquelles il est fréquemment observé. Toutes les Droseraceae sont adaptées à des habitats très pauvres en nutriments (tourbières acides à végétation basse, rochers siliceux suintants...). Leurs feuilles spécialisées, configurées en pièges, portent des poils glanduleux qui sécrètent des gouttelettes mucilagineuses réfringentes et adhésives. Les invertébrés attirés par des émanations odorantes s'y engluent. La sensibilité des poils à la composition chimique et aux mouvements des proies (chimiotactisme et thigmotactisme) déclenche l’enroulement progressif des poils et des feuilles autour d'elles. Des enzymes digestives sont sécrétées et il a été démontré par marquage radio-isotopique que les produits de cette digestion externe passent dans la sève. Le genre Drosera est protégé en France et ne peut être récolté en milieu naturel que sur dérogation préfectorale pour la phytopharmacie et la recherche.Rumantsch: Die Sonnentau Hybride Drosera x obovata - Lispach Moore in den französischen Hoch Vosesen. Français : Paddle-leaved sundew (Drosera x obovata) - Mire of Lispach, Vosges mountains, France. |
Date | |
Source | Own work |
Author | Vosagus |
Tourbière de Lispach - Hautes-Vosges - Étage montagnard altitude 909 m - Commune LA BRESSE - Département des Vosges - Région Lorraine - France - Territoire du Parc naturel régional des Ballons des Vosges.
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current | 23:23, 30 May 2015 | 3,872 × 2,592 (2.49 MB) | Vosagus (talk | contribs) | User created page with UploadWizard |
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Metadata
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Camera manufacturer | PENTAX Corporation |
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Camera model | PENTAX K10D |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/6.7 |
ISO speed rating | 100 |
Date and time of data generation | 10:06, 28 June 2009 |
Lens focal length | 37 mm |
Software used | Picasa 3.0 |
File change date and time | 10:06, 28 June 2009 |
Y and C positioning | Co-sited |
Exposure Program | Aperture priority |
Exif version | 2.21 |
Date and time of digitizing | 10:06, 28 June 2009 |
Meaning of each component |
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APEX exposure bias | 0 |
Metering mode | Spot |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Focal length in 35 mm film | 55 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Macro |
Unique image ID | 88d50fec9d7792068d80df5905ee40a1 |
Keywords |
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