ON THE WATER-BALANCE OF PHYTOSEIULUS-PERSIMILIS A-H AND ITS ECOLOGICAL SIGNIFICANCE

被引：46
作者：
GAEDE, K
机构：
[1] Institut für Angewandte Zoologie, Freie Universität Berlin, Berlin, D-1000
来源：
EXPERIMENTAL & APPLIED ACAROLOGY | 1992年 / 15卷 / 03期
关键词：
D O I：
10.1007/BF01195790
中图分类号：
Q96 [昆虫学];
学科分类号：
摘要：
The net water vapour exchange of Phytoseiulus persimilis A.-H. is described. Water loss by transpiration increases progressively with ambient temperature. The transpiration rate is directly proportional to the saturation deficit of the air (15 to 30-degrees-C) and at constant temperature linearly dependent on the water vapour activity: m(T)=-0.81 a(v) + 0.91 (for a(v) 0.0 to 0.85 at 20-degrees-C). Phytoseiulus persimilis is able to absorb water vapour from the unsaturated atmosphere. This occurs above a certain threshold (critical equilibrium activity, CEA), which is a(v)=0.9 at 15 to 25-degrees-C and increases to a(v)=0.935 at 30-degrees-C. The environmental humidity conditions influencing P. persimilis on the leaf surface are described. The diurnal water vapour profile within the laminar layer at the leaf surface includes periods with water vapour values high enough for these mites to utilize their water vapour sorption capability and to restore a previously-suffered water deficit. In addition, P. persimilis shows a positive hygrotactic behaviour when in a state of water deficit. The survival time of starving P. persimilis is at least doubled when a possibility to absorb water vapour is available. The water balance at limited food resources is discussed. With a food supply (one prey mite, containing about 5.5 mug water) every 3 days and a water vapour activity of a(v)=0.76 (20-degrees-C), water balance is achieved and the survival time is maximal (approximately 120 days).
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页码：181 / 198
页数：18
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