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52 recherche sur le mot-clé
'Mean crowding' 
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M. Tokeshi | 1995The mathematical basis of a widely-known variance-mean power relationship of ecological populations was examined. It is shown that the log variance (S-2)-log mean (m) plot is virtually delimited by two lines log S-2 = log n + 2 log m and log S-2[...]
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R. Butts ; G. Schaalje | 1994Current methods of characterizing spatial distributions of insects were applied to Russian wheat aphid, Diuraphis noxia (Mordvilko), data in winter wheat, Triticum aestivum L., plants sampled in the fall to derive information about the biology o[...]
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article/chapitre/communication
article/chapitre/communication
S. Iwao | 1972
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article/chapitre/communication
N. Elliott ; R. Kieckhefer | 1986
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D. Pilson ; M. Rausher | 19951. The aphids Uroleucon tissoti and U.nigrotuberculatum both exhibit significantly aggregated distribution patterns across clumps of their common host plant Salidago altissima, the tall goldenrod. However, U.nigrotuberculatum is significantly mo[...]
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F. Pennachio ; E. Tremblay | ?
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X. Ru-Mei | 1985
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D. Schotzko ; C. Smith | 1991
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J. Walgenbach ; J. Wyaman ; D. Hogg | 1985
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R. James ; B. Shaffer ; B. Croft ; B. Lighthart | 1995Several strains of the entomopathogenic fungus Beauveria bassiana have been considered for use as microbial insecticides. Experimental sprays were conducted in an alfalfa field with an aphid-derived strain of B. bassiana to determine its persist[...]
