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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水稻种植制度下褐飞虱种群动态的基本特征存在明显差异：（1）在热带同步种植区，褐飞虱种群在始代至高峰期迅速繁殖，尽管初始迁入密度较低，但往往达到破坏水平，如温带地区。但在交错种植区和同步种植区的第二季，种群增长率和种群高峰密度都要低得多。寄生蜂等天敌的丰度是造成这种季节性种群发展差异的主要原因。(2)在前几代中，根据最初或以前季节世代的密度，可以相当准确地预测每个稻田中高峰世代的密度或暴发的发生。在后者中，然而，种群增长率和种群密度的峰值在各领域之间的差异很大，这取决于每个领域的水分状况。(3)在前者中，由于种内竞争，调节过程仅在导致宿主植物严重恶化的高密度下才被检测到。然而，在后者中，调节过程在作物的早期阶段以低得多的密度运行。大翅类成虫的密度依赖扩散对稳定田间种群波动起着重要作用。