Temporal Variation in the Spatial Dispersion Patterns of Aphids (Homoptera: Aphididae) Infesting Strawberries

1 April 1983

journal article
Published by Oxford University Press (OUP) in Environmental Entomology

Vol. 12 (2) , 595-598
https://doi.org/10.1093/ee/12.2.595

Abstract

Temporal changes in spatial distribution patterns of aphids infesting winter strawberries in coastal California were determined using Green's Coefficient, C_x, Iwao's regression of mean crowding on the mean, and Lloyd's “Patchiness Index.” Both C, and the Patchiness Index indicated the aphids were initially overdispersed, but became random as populations increased. Distribution remained random following population collapse, suggesting that density-independent mortality factors suppressed populations. Iwao's regression method provided analogous results when populations were temporarily stratified

Keywords

APHIDS
MEAN CROWDING
IWAO'S REGRESSION
PATCHINESS INDEX
STRAWBERRIES
INFESTING
TEMPORAL
RANDOM AS POPULATIONS

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