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'Relation de Taylor' 
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G. Nachman | 1981article/chapitre/communication
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[...]article/chapitre/communication
K. Yamamura | 2000Two equations have been used frequently to describe the relation between the sample variance (s(2)) and sample mean (m) of the number of individuals per quadrat: Taylor's power law, s(2) = am(b), and Iwao's m* - m regression, s2 = cm + dm(2), wh[...]article/chapitre/communication
J. Negron ; W. Schaupp ; E. Johnson | 2000The Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, attacks Douglas-fir, Pseudotsuga menziesii (Mirb.) France (Pinaceae), throughout western North America. Periodic outbreaks cause increased mortality of its host. Land managers and forest[...]article/chapitre/communication
E. Kapatos ; E. Stratopoulou ; A. Sahinoglou ; J. Tsitsipis ; D. Lycouresis | 1996A sampling plan was developed for the study of the population dynamics of Aphis gossypii, Glover on cotton. The distribution of the population of A. gossypii within the plant is not randomly distributed in relation to height. At the beginning (e[...]article/chapitre/communication
Plant bugs in the genus Lygus are pests of canola (Brassica napus L. and Brassica rapa L.) in western Canada and may require insecticidal control. Sweep-net sampling of field plots and commercial fields in southern Manitoba between 1988 and 1995[...]article/chapitre/communication
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[...]article/chapitre/communication
J. Walgenbach | 1994The distribution patterns of parasitized and nonparasitized potato aphids, Macrosiphum euphorbiae (Thomas), were assessed on four plantings of staked tomatoes from 1988 to 1990. Within plant distribution of nonparasitized aphids changed through [...]article/chapitre/communication
Spatial aspects of the interaction between the aphid host. Aphis gossypii. and its parasite. Allothrombium pulvinum larvae, on cotton plants were examined in seven fields in China. For both the host and the parasite, sample variance increased wi[...]article/chapitre/communication
W. Kendal | 1995The spatial distribution of plants and animals generally obeys a power law relationship between the variance and the mean of the numbers of individuals per unit area. The mechanistic basis for this relationship remains controversial. Here a prob[...]article/chapitre/communication
J. Perry ; W. Parker ; L. Alderson ; S. Korie ; J. Bloodsmyth ; R. Mckinlay ; S. Ellis | 1998Populations of the mealy cabbage aphid, Brevicoryne brassicae (L.), on Brussels sprout plants, Brassica oleracea (L.) were sampled, fortnightly throughout the early season of 1996 in 2 ha(2) blocks. Sampling was done on two spatial scales, first[...]article/chapitre/communication
Three cereal aphids, Rhopalosiphum padi (L.), Schizaphis graminum (Rondani), and Sitobion avenae (F.), invade wheat fields in the northern Great Plains each spring, and populations occasionally reach economic levels. The first objective of this [...]article/chapitre/communication
Sequential decision plans based on aphid counts and binomial counts of infested plants (presence or absence of aphids) were developed to guide chemical control decisions for the potato aphid, Macrosiphum euphorbiae, on two growth stages of oilse[...]
