Spatial distribution and mortality process ofAnoplophora malasiaca (Coleoptera: Cerambycidae) eggs in citrus groves |
| |
Authors: | Ishizue Adachi |
| |
Institution: | (1) Okitsu Branch, Fruit Tree Research Station, MAFF, Okitsu, Shimizu, 424-02 Shizuoka, Japan |
| |
Abstract: | Summary The study was carried out in two (A and B) citrus groves to clarify the spatial distribution patterns of eggs and larvae,
and to analyse the mortality process of eggs. From the analysis by using the mean density and the mean crowding, it was clarified
that the distributions of eggs were contagious and that larvae were more contagiously distributed than eggs. The τ andz indices showed that the operation of egg mortality was inversely density-dependent in both groves, and that the degree of
inverse density-dependence was greater in A than in B grove. The spatial correlations between the emergence holes and the
eggs or larvae in each tree, which were analysed by using ω index, showed that the distributions were more overlapping between
the emergence holes and the larvae than the eggs. As the result of dividing trees into several groups according to the number
of emergence holes, it was clarified that the survival rates of eggs were positively correlated with the number of emergence
holes. In conclusion, inversely density-dependent mortality process was considered to be caused by lower mortality rates of
eggs in the trees with more emergence holes. Especially in A grove, because the trees with more emergence holes were larger
in diameter and more egg oviposition, the inversely density-dependent mortality process was considered to be detected more
conspicuously than in B grove. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|