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English version: (veja Português em seguida) Transverse orientation is the process by which insects can fly keeping a constant angle relative to a distant light source, such as the moon. This helps them to flight at a straight line. Unnatural sources of light, such as a bulb, are too close so that there are substantial changes in the angular relationship between the light source and the direction of flight. By instinctively trying to keep constant the angle of their direction of flight, insects would end up describing a spiral flight towards the light bulb. Here I present a drawing (in *.pdf, *.png, and *.svg formats) to illustrate this process. For a comprehensive discussion on this process of orientation in moths, see Franks (2006, Effects of artificial night lighting on moths, in: Rice and Longcore [eds] Ecological consequences of artificial night lighting ISSBN 1–55963–128–7). Versão em Português A orientação transversal é o processo pelo qual os insetos voam mantendo um ângulo constante em relação a uma fonte de luz distance, tal como a lua. Isso guarante um voo em linha reta. Uma fonte não natural de luz, como por exemplo uma lâmpada, estão relativamente muito próximas. Isso implica que a cada ponto da trajetória do inseto, haverá mudanças significativas na relação angular entre a direção do voo e a fonte de luz. Ao tentar instintivamente corrijir o curso mantendo uma angulação constante, o inseto acaba voando numa espiral que o direciona à lâmpada. Aqui apresento um desenho (em *.pdf, *.svg e *.png) que ilustra este processo. Para uma discussão detalhada do processo de orientação em mariposas, veja Franks (2006, Effects of artificial night lighting on moths, in: Rice and Longcore [eds] Ecological consequences of artificial night lighting ISSBN 1–55963–128–7).
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insect orientation, unnatural light, moonlight, spiral flight
insect orientation, unnatural light, moonlight, spiral flight
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