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File:Close-up view of a bioluminescent beetle Elateroidea.jpg

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English: Close-up view of a bioluminescent beetle Elateroidea (Lampyridae Ototretinae Stenocladius or Rhagophthalmidae), on a leaf. This specimen measures about 20 mm (0.79 in). The species produces and emits light, via a chemical reaction during which chemical energy is converted into light energy. The principal chemical reaction in bioluminescence involves some light-emitting molecule and an enzyme, generally called the luciferin and the luciferase, respectively. Oxidation of organic compounds induces photon emission. The intensity of this light can be perceived by the human eye in a radius of 2 m (6.6 ft). This is a long-exposure photograph (1.3 s) made with a tripod and a macro lens, in the middle of the night (2 am). In conditions of ambient darkness, the adjustment of the manual focus is difficult, and the camera settings (ISO and depth of field) should be done according to the mobility of the living organism, which may lead to motion blurs. At any time, the insect can also decrease the intensity or even completely stop emitting its light (example here). A soft and diffuse auxiliary lamp has been brought to reveal the details of the animal. Bioluminescent beetle species are in regression in the world because of the phenomenon of light pollution, insecticides and climate change. This specimen comes from the island of Don Det, Si Phan Don, Laos, a wild area far from any major city. This image won the 1st prize of the Wiki Science Competition category Wildlife and nature from France.
Français : Vue rapprochée d'un coléoptère bioluminescent Elateroidea (Lampyridae Ototretinae Stenocladius ou Rhagophthalmidae), sur une feuille. Le specimen mesure environ 20 mm (0.79 in). Cette espèce produit et émet de la lumière via une réaction chimique au cours de laquelle l'énergie chimique est convertie en énergie lumineuse. Le composé chimique à l'origine de cette bioluminescence est la luciférine. Celle-ci émet de la lumière en s'oxydant grâce à l'intervention de la luciférase, une enzyme. L'oxydation de composés organiques induit une émission de photons. L'intensité de cette lumière peut être perçue par l'oeil humain dans un rayon de 2 m (6.6 ft). Cette photographie a été réalisée en pose longue (1,3 s), appareil sur trépied avec un objectif macro, en pleine nuit (2 heures du matin). Dans les conditions d'obscurité ambiante, la mise au point précise du focus manuel est particulièrement scabreuse, tout comme celle des réglages photographiques (ISO et profondeur de champ), notamment à cause de la mobilité de l'organisme vivant susceptible d'entraîner des flous cinétiques. A tout moment, l'insecte peut aussi diminuer l'intensité ou même totalement cesser d'émettre sa lumière (exemple ici). Une lampe d'appoint douce et diffuse a été apportée à proximité pour révéler les détails de l'animal. Les espèces bioluminescentes de coléoptères sont en voie de régression dans le Monde à cause du phénomène de pollution lumineuse, des insecticides et du dérèglement climatique. Ce specimen habite l'île de Don Det, Si Phan Don, au Laos, dans une région sauvage éloignée des grandes villes. Cette image a remporté le premier prix de la Wiki Science Competition catégorie Wildlife and nature from France
Date Taken on 2 September 2019 01:54:22
Source Own work
Author Basile Morin
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Camera location13° 59′ 07.27″ N, 105° 54′ 58.04″ E Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
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Close-up view of a bioluminescent beetle Elateroidea

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13°59'7.271"N, 105°54'58.043"E

2 September 2019

1.3 second

100 millimetre

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e85037ba570987d072efbc27705b6d4c03095db3

1,608,665 byte

2,080 pixel

3,120 pixel

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Date/TimeThumbnailDimensionsUserComment
current12:02, 6 November 2019Thumbnail for version as of 12:02, 6 November 20193,120 × 2,080 (1.53 MB)Basile MorinUser created page with UploadWizard

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