PioneerAlgae colonneHelfaut



This photo was viewed 1 times and was downloaded in full size 0 times.

This photo was liked 0 times

Please login in order to see the source link


Description fr macrophotographie montrant la croute d'algues et bactéries fixant efficacement le sable soumis à érosion (sur un turricule de taupinière). Malgré la pluie le sable reste en place fixé par le biofilm et substance mucilagineuses produites par les algues, bactéries. On trouve aussi quelques lichens mais qui ont fortement régressé en raison de la pollution de l'air dans cette zone (agriculture intensive et 4 papeteries et une grande verrerie cristallerie à proximité). Photo prise sur le Plateau d'helfaut près de la Colonne d'Helfaut (près de St Omer, dans le pas de Calais, en France) en first stage of colonisation by pioneer species (bacteria + algae) on sand, (Helfaut, Pas de Calais, north of france)
Date 2001 05 12
Source Own work
Author Lamiot


I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

w:en:Creative Commons
This file is licensed under the Creative Commons Attribution 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).

You may select the license of your choice.

GNU Free Documentation License


Only registered users can post comments. Please login

EXIF data:
File name pioneeralgae_colonnehelfaut.jpg
Size, Mbytes 0.141983398437
Mime type image/jpeg
Camera manufacturer SONY
Camera model CYBERSHOT
Orientation of image 1
Image resolution in width direction 72
Image resolution in height direction 72
Unit of X and Y resolution 2
Compressed bits per pixel 2
Exif version 0210
Date and time original image was generated 2001:05:12 05:29:23
Date and time image was made digital data 2001:05:12 05:29:23
Meaning of each component 
Supported Flashpix version 0100
Color space information 1
Exif image width 1024
Exif image length 768
InteroperabilityOffset 352
Interoperability index R98
Interoperability version 0100
The images at Free-Photos.biz come mainly from Wikimedia Commons or from our own production. The photos are either in the public domain, or licensed under free linceses: Free-Photos.biz license, GPL, Creative Commons or Free-Art license. Some very few other photos where uploaded to Free-Photos.biz by our users and released into the public domain or into free usage under another free license (like GPL etc.)

While the copyright and licensing information supplied for each photo is believed to be accurate, Free-Photos.biz does not provide any warranty regarding the copyright status or correctness of licensing terms. If you decide to reuse the images from Free-Photos.biz, you should verify the copyright status of each image just as you would when obtaining images from other sources.

The use of depictions of living or deceased persons may be restricted in some jurisdictions by laws regarding personality rights. Such images are exhibited at Free-Photos.biz as works of art that serve higher artistic interests.

christianity portal