Image:Dead tree river.jpg

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English:

Dead tree in a river, rainforest Vancouver Island, BC, Canada.

Photography: --Superbass 09:33, 24 July 2005 (UTC)

Français :

Tronc mort dans un fleuve (ou rivière), Forêt pluvieuse de l'Ile de Vancouvert, Colombie Britanique, Canada.

De tels troncs en descendant les fleuves à l'occasion d'une inondation par exemple peuvent naturellemment transporter des propagules de dizaines d'espèces de plantes et lichens, et des propagules de centaines d'espèces d'invertébrés et microorganismes sur des distances parfois importantes et jusqu'en mer. Noter les arbres qui sont déjà en train de pousser dans le bois en décomposition, profitant de l'humidité et de la lumière reflétée par l'eau. C'est ainsi aussi qu'on peut parfois trouver des arbres dont on ne comprend pas comment ils auraient pu germer ou s'enraciner sous l'eau.


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File history

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Date/TimeDimensionsUserComment
current09:33, 24 July 20051,600×1,200 (850 KB)Superbass (Dead tree in a river, rainforest Vancouver Island, BC, Canada. Photography: --~~~~ {{GFDL} )
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Metadata

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Camera manufacturer Canon
Camera model Canon DIGITAL IXUS
Exposure time 1/45 sec (0.022222222222222)
F-number f/3.5
Date and time of data generation 15:12, 26 June 2002
Lens focal length 9.28125 mm
Orientation Normal
Horizontal resolution 180 dpi
Vertical resolution 180 dpi
File change date and time 15:12, 26 June 2002
Y and C positioning 1
Exif version 2.1
Date and time of digitizing 15:12, 26 June 2002
Image compression mode 3
Shutter speed 5.4918518066406
Aperture 3.6147155761719
Exposure bias 0
Maximum land aperture 2.9708557128906
Subject distance 3.178 metres
Metering mode CenterWeightedAverage
Flash 0
Color space sRGB
Focal plane X resolution 7766.9902912621
Focal plane Y resolution 7741.935483871
Focal plane resolution unit inches
Sensing method One-chip color area sensor