File:Pont-canal de Briare Lamiot Pollution lumineusedetail 2.jpg
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Français : Base de luminaires et éléments architectural de la partie supérieure du Pont-canal de Briare (pont d'acier riveté et de pierre, dont le socle de pierre a été dessiné par Gustave Eiffel), qui passe au dessus de la Loire (France, Région centre, Département du Loiret), perpendiculairment à celle ci.
Exemple d'impact de la "pollution lumineuse" 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 (moucherons, 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 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 prolixe, et elles sont donc anormalement nombreuses. Ce phénomène semble correspondre à ce que les écologues appellent un "puits écologique" et un piège écologique notamment due au phénomène dit de pollution par la lumière polarisée (qui pourrait expliquer pourquoi, comme on le voit sur cette photo les éphéméridés viennent pondre sur la peinture des mâts de luminaires au lieu de pondre dans l'eau). Les chauves-souris, les poissons et crustacés pourraient aussi être perturbés par cette lumière. English: Lighting and architectural elements of the upper part of the Briare aqueduct (deck riveted steel and stone, the stone base has Designed by Gustave Eiffel), which passes above the Loire (France, Region Centre, Department of Loiret) perpendiculairment to this one. Example of impact of the light pollution "on the Loire River, which is often described as the last wild river in France. More lights are near the center and the axis of the river Loire (the bridge that crosses it at right angles), more lights attract insects at night just to emerge from the water (NB: Some of these insects (midges, caddisfly s, stonefly s including Ephemeroptera) are considered "bioindicators" indicating a good quality of water, 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 Loire, under the lights attract insects (which shows that the quality of canal water is bad, and that insects are only from Loire). The amount of cobwebs, the number of spiders and the number of bodies are clues to the amount of trapped insects and, since every morning wasps come - sometimes hundreds - "steal" the spiders on their canvas, 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 a food unusually prolific, and they are unusually numerous. This phenomenon seems to be what ecologists call a "ecological trap" in particular due to the phenomenon known as Pollution polarized light (which may explain why, as seen in this photo ephemeris lay their eggs on the painting of the mast lights instead of laying in the water). Bats, fish and shellfish may also be affected by this light. |
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| Source | Own work |
| Author | Lamiot |
| Other versions | Derivative works of this file: Pont-canal de Briare Lamiot Pollution lumineusedetaillEggsOeufs.jpg |
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| current | 15:38, 20 September 2009 | | 2,150 × 1,662 (518 KB) | Lamiot (talk | contribs) | {{Information |Description={{fr|Base de luminaires et éléments architectural de la partie 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, Dép |
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