File:Briare canal bridge Wasps Guêpe Light Pollution 2009 08 02.jpg
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[edit]DescriptionBriare canal bridge Wasps Guêpe Light Pollution 2009 08 02.jpg |
Français : sous un élément décoratif architectural, éclairée la nuit, le jour des dizaines de guêpes viennent incessamment découper et emporter des éphémères piégés et tués la nuit précédente par les araignées, alors qu'ils étaient venus se prendre dans leurs toiles (attirés par la lumière). Lieu : partie aval supérieure du Pont canal de Briare (pont d'acier riveté et de pierre, dessiné par Gustave Eiffel), qui passe au dessus de la Loire (France, Région centre, Département du Loiret), perpendiculairment à celle ci.
Pris dans son contexte, ce phénomène illustre un des impacts de la "pollution lumineuse", ici sur la Loire, fleuve qui est souvent qualifié de dernier fleuve sauvage de France. Plus les lampes sont proche du centre et de l'axe du fleuve (sur le pont qui la traverse perpendiculairement), plus ces lampes attirent les insectes nocturnes qui viennent d'émerger de l'eau (Rem : Certains de ces insectes (trichoptères, plécoptères dont éphémères) sont considérés comme des "bioindicateurs" indiquant une bonne qualité de l'eau, et sont en forte régression en France depuis le début du XXème siècle). Sur ce pont, plus on s'éloigne à droite ou à gauche des rives de la loire, moins les luminaires attirent les insectes (ce qui montre que la qualité de l'eau du canal est mauvaise, et que les insectes ne viennent que de la Loire). La quantité de toiles d'araignées, le nombre d'araignées et le nombre de cadavres sont des indices de la quantité d'insectes ainsi piégés, car dès le matin des guêpes (Vespula vulgaris) viennent - parfois par centaines - "voler" aux araignées, sur leur toile, une partie des cadavres d'insectes qu'elles ont tué et stocké dans un fourreau de soie dans la nuit. A cause de la chaleur des lampes et de leur intensité, ces araignées bénéficient d'une nourriture anormalement prolyxe, et elles sont donc anormalement nombreuses. Ce phénomène semble correspondre à ce que les écologues appellent un "puits écologique" et un piège écologique. Les chauve-souris, les poissons et crustacés pourraient aussi être perturbés par cette lumière. English: Briare canal bridge over the Loire (France). Example of enviromental impact of "light pollution" on some insects of the Loire River (which is often described as the last wild river in France). More lights are close to the center of the Loire (on the bridge that crosses it at right angles), the more lights attract insects at night just emerging from the water (rem: Some of these insects (Trichoptera sp., Plecoptera sp. including Ephemeroptera) are regarded as "bioindicators" indicating good water quality, and are rapidly declining in France since the early twentieth century). On this bridge, the further away to the right or left banks of the river Loire, under the lights attract insects. The amount of cobwebs (Spider web), the number and size of spiders and the number of bodies of insects are clues to the amount of trapped insects and, since every morning wasps come - sometimes hundreds - "steal" the spiders on their web, part of dead insects they were killed and stored in a sheath of silk in the night. Because of the heat lamps and their intensity, these spiders have an abnormally prolyxe food, and they are unusually numerous. This phenomenon seems to be what ecologists call a "green shaft". Bats and fishes could also be perturbed by this light. |
Date | |
Source | Own work |
Author | Lamiot |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 12:49, 18 December 2011 | 2,337 × 1,737 (499 KB) | Rotatebot (talk | contribs) | Bot: Reset EXIF-specified Orientation of image (EXIF-Orientation set from 8 to 1, rotated 0°) | |
16:01, 20 September 2009 | 1,737 × 2,337 (515 KB) | Lamiot (talk | contribs) | {{Information |Description={{fr|sous un élément décoratif architectural, éclairée la nuit, le jour des dizaines de guêpes viennent incessamment découper et emporter des éphémères piégés et tués la nuit précédente par les araignées, alors q |
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F-number | f/4 |
ISO speed rating | 80 |
Date and time of data generation | 11:22, 2 August 2009 |
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File change date and time | 11:22, 2 August 2009 |
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Exif version | 2.2 |
Date and time of digitizing | 11:22, 2 August 2009 |
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