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Étude Expérimentale des Variations de la Tendance au vol Chez le Criquet PèlerinSchistocerca Gregaria (Forsk), Élevé Isolément Pendant Plusieurs Générations

Abstract : The flight tendency of locusts reared solitarily for several generations has been studied. Locusts were suspended for two hours every other day from individual roundabouts in isolated enclosures excluding all external stimuli; in darkness, artificial or natural light. The results include all types of locust flights as the best flyers were not selected beforehand. Limited continuous flights only occur during the first generation of solitary locusts. Series of very short flights following one another in rapid succession can often be observed. These series of flights have been called «linked flights». The most usual form of flight activity is a succession of flights each lasting from one to five minutes, separated by rest periods of about the same lenght. Flight activity in light is very low compared with activity in darkness. Natural light inhibits flight much less than artificial light. Flight activity in light as well as in darkness varies according to the individual locust's flight tendency. For both sexes, flight tendency increases to begin with during the first two weeks then becomes irregular or decreases, according to the individual or it's generation. This tendency then increases again and reaches a maximum generally coinciding with sexual maturity. Activity, for both sexes is formed of successive bursts varying in duration and importance. General flight tendency decreases in both sexes after the period corresponding to the first oviposition. Maximum activity is earlier in females than in males. The former possess a superior flight tendency. However there is a certain simultaneity between both sexes during the increase phase of general activity, and the decrease phase caused by ageing. The effect of isolation reaches almost total inhibition as soon as the first generation. Females maintain their flight tendency better throughout all successive generations reared solitarily.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01368382
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Submitted on : Monday, September 19, 2016 - 2:37:27 PM
Last modification on : Thursday, January 9, 2020 - 4:08:05 PM

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Raoul Michel. Étude Expérimentale des Variations de la Tendance au vol Chez le Criquet PèlerinSchistocerca Gregaria (Forsk), Élevé Isolément Pendant Plusieurs Générations. Insectes Sociaux, Springer Verlag, 1970, 17 (1), pp.21-38. ⟨10.1007/BF02223770⟩. ⟨hal-01368382⟩

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