Comparative analysis of population dynamics of the brown planthopper between the tropical and temperate region.

热带与温带褐飞虱种群动态比较分析

基本信息

批准号：
05660048
负责人：
SAWADA Hiroichi
金额：
$ 1.28万
依托单位：
The University of Shiga Prefecture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05660048/
关键词：
Tropics Rice Pest Brown Planthopper Agro-ecosystem Population Dyamics Natural Enemy Indonesia ジャワ島

项目摘要

Distinct differences in the basic features of population dynamics of the brown planthopper were detected between the different rice cropping systems in the tropical and temperate regions : (1) In the synchronous cropping area in the tropics, BPH populations multiplied rapidly in the period from initial to peak generation, reaching quite often the destructive level despite the low density of initial immigrants, as shown in the temperate regions. However, in the staggered cropping area and also in the second crops in the synchronous area, the population growth rate and the peak population density were much lower. The abundance of natural enemies such as parasitic wasps playd a major role in determining such a difference in seasonal population development. (2) The density at the peak generation or the occurrence of outbreaks in each paddy field was predictable in the formers with fairly high accuracy on the basis of the density at the initial or previous seasonal generations. In the latters, however, the rate of population growth and the peak population density widely varied among the fields depending on the water status in each field. (3) In the formers, the regulatory processes were only detected in such high densities as cause the considerable deterioration of host plant, because of intra-specific competition. However, in the latters, the regulatory processes operated at a much lower density in the earlier stages of the crops. Density-dependent dispersal of macropterous adults playd an important role to stabilize the population fluctuation among the fields.

热带和温带地区不同稻作制度下褐飞虱种群动态的基本特征存在明显差异：（1）在热带同熟区，褐飞虱种群在从初期到后期快速繁殖。正如温带地区所显示的那样，尽管最初的移民密度较低，但仍经常达到破坏性的水平。然而，在错作区和同步区的二季作物中，人口增长率和人口峰值密度要低得多。寄生黄蜂等天敌的丰富程度在决定种群季节性发展差异方面发挥了重要作用。 (2) 前者可以根据初始世代或前一季节世代的密度，以相当高的精度预测各稻田发生高峰世代的密度或发生爆发的情况。然而，在后者中，人口增长率和人口峰值密度在不同领域之间存在很大差异，具体取决于每个领域的水状况。 (3)在前者中，由于种内竞争，调节过程仅在导致寄主植物严重恶化的高密度下被检测到。然而，在后者中，在作物的早期阶段，监管过程的运行密度要低得多。大翅成虫的密度依赖性扩散对于稳定田间种群波动发挥了重要作用。