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Schistocerca americana : ウィキペディア英語版 | Schistocerca americana
''Schistocerca americana'' is a species of grasshopper in the family Acrididae known commonly as the American grasshopper〔Squitier, J. M. and J. L. Capinera. (''Schistocerca americana'' (Drury). ) Entomology and Nematology. University of Florida IFAS.〕 and American bird grasshopper.〔Alborn, H. T., et al. (2007). (Disulfooxy fatty acids from the American bird grasshopper ''Schistocerca americana'', elicitors of plant volatiles. ) ''Proceedings of the National Academy of Sciences'' 104(32) 12976-81.〕 It is native to North America, where it occurs in the eastern United States, Mexico, and the Bahamas.〔 There are occasional, localized outbreaks of this grasshopper, and it is often referred to as a locust,〔Greenlee, K. J. and J. F. Harrison. (2004). (Development of respiratory function in the American locust ''Schistocerca americana'' I. Across-instar effects. ) ''Journal of Experimental Biology'' 207(3) 497-508.〕 though it lacks the true swarming form of its congener, the desert locust (''S. gregaria'').〔Thomas, M. C. (The American grasshopper, ''Schistocerca americana americana'' (Drury) (Orthoptera: Acrididae). ) Entomology Circular No. 342. Florida Department of Agriculture and Consumer Services. May, 1991.〕 ==Description== The adult male of the species is up to 4.5 centimeters long, and the adult female may reach 5.5 centimeters. The body of the adult is generally yellow-brown in color and the wings are pale with large brown spots. The nymphs are different in appearance.〔 They change color as they mature and their coloration is a polyphenic trait: one that is influenced by environmental conditions, producing multiple forms from one genotype. This is not uncommon among grasshoppers. In this species, the coloration of the nymphs is especially influenced by temperature. Nymphs are various shades of green, yellow, or red, usually with a pattern of black markings. They are often red at lower temperatures, but at higher temperatures, only green and yellow shades occur. Black patterning is also influenced by temperature, with lower temperatures inducing darker markings. Density is also a common factor in color polyphenism, but it is less important in this species than in many other grasshoppers. Nymphs reared in crowded conditions develop darker black markings, but density has little effect on their background colors.〔Tanaka, S. (2004). (Environmental control of body-color polyphenism in the American grasshopper, ''Schistocerca americana''. ) ''Annals of the Entomological Society of America'' 97(2) 293-301.〕
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