Spatial distribution of the green peach aphid used in estimating the populations of gynoparae
| Autor: | Jerome A. Onsager, George Tamaki, J. U. McGuire |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
Aphid
education.field_of_study biology Population Negative binomial distribution Sampling (statistics) biology.organism_classification Spatial distribution Poisson distribution symbols.namesake Botany Statistics symbols Statistical dispersion Myzus persicae education Ecology Evolution Behavior and Systematics |
| Zdroj: | Population Ecology. 15:64-75 |
| ISSN: | 1438-390X 1438-3896 |
| DOI: | 10.1007/bf02510710 |
| Popis: | In 2 years, during the initial invasion of peach leaves by the green peach aphid,Myzus persicae (Sulzer), the number of gynoparae was low, and the distribution on leaves was random. Then as the mean number increased, the distribution became intermediate and could not be distinguished from either a Poisson or a negative binomial. Finally, as the mean continued to increase, the variance increased rapidly, and the population was found to fit a negative binomial distribution. Thus the aggregation response was verified because the dispersion pattern fitted a contagious distribution. A sampling plan was devised by which the dispersion parameterk was used to estimate the density of aphids per leaf based on the percentage of leaves infested. Sampling the third year of the study confirmed the validity of the sampling parameter that had been calculated from data for the 2 previous years. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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