Variation and Consistency in Spatial Distribution as Measured by Taylor's Power Law

Variação espacial como mecanismo promotor da coexistência em comunidades de insetos necrófagos

“…Embora os valores do intercepto (a) e do coeficiente angular (b) não sejam significativamente diferentes entre experimentos, a variação de a é muito maior (duas magnitudes) que a de b. Tais variações de a podem ser causadas por uma mudança na linha de regressão (aumento da variância) ou por uma "modificação do meio" (variação espacial) como observado em outros sistemas (e.g. TAYLOR et al 1998).…”

Estimating the Relative Abundance of Adult Citrus Root Weevils (Coleoptera: Curculionidae) with Modified Tedders Traps

“…Of greater concern for the purpose of determining general sampling requirements for these weevils is that the largest and smallest estimates of b in this study varied signiÞcantly. Although the parameter b has been suggested to be characteristic for a given species (Southwood 1966), Taylor et al (1998) note that there is "ample evidence" that the spatial pattern of a species can vary with region, crop, crop phenology, location on the plant, or due to pest management. Variability in the parameter a is frequently greater than that of b, is affected by sampling protocol, and has a proportionately greater effect on sampling requirements (Taylor et al 1998).…”

Host Specificity, Parasite Community Size and the Relation between Abundance and its Variance

“…Taylor's (1961) notion about species-specific constancy of b appeared not to be always true. Sampling of even the same reproductive population but under different conditions (e.g., stage, phenology, or habitat) resulted in different power law estimates (Taylor et al, 1998a). Furthermore, aggregation of parasites arises due to heterogeneities in host populations Shaw and Dobson, 1995) and, thus, should heavily depend on external (in relation to a species of interest) factors.…”