摘要:
研究了斯氏钝绥螨Amblyseius swirskii(Athias-Henriot)以截形叶螨Tetranychus truncatus(Ehara)为猎物在15、18、20、25、30和35℃下的发育和繁殖情况,组建了实验种群生命表。结果表明15℃时斯氏钝绥螨能完成发育,但存活率仅43.33%,且产卵不正常;在18～35℃之间斯氏钝绥螨能正常生长发育;在15～35℃之间斯氏钝绥螨的发育历期随温度的升高而缩短,雌螨的发育历期为5.75～31.50 d,雄螨的发育历期为3.96～20.00 d;斯氏钝绥螨的世代平均周期(T)和种群倍增时间(t)随着温度的升高而缩短,35℃时世代平均周期和种群倍增时间最短,分别为15.9380 d和3.5072 d;内禀增长率(rm)和周限增长率(λ)随着温度的升高而增大,在35℃时均最大,分别为0.197 6和1.218 5;雌雄性比和净增殖率随着温度的升高呈现先增后减的趋势,在25℃时性比和净增殖率均最大,分别为1.73和36.8600;产卵总量也在25℃时最大,达到57.60粒·雌-1。
Abstract:
The parameters of a life table with an experimental population of Amblysieus swirskii(Athias-Henriot)were studied.At 6 constant temperatures(i.e.,15℃,18℃,20℃,25℃,30℃ and 35℃),A.swirskii were fed on Tetranychus truncatus(Ehara)to evaluate the feasibility of utilizing the predatory mites to control the spider mites.The in-laboratory experiments showed that,at 15℃,the predatory mite could develop,but its survival rate was less than 43.33%,and there were irregularities observed in its egg-laying.The temperature range of 18-35℃ was considered appropriate for the predatory mite's development.And,within the range,the time for A.swirskii to develop shortened as the temperature rose-the longest(31.50 days)at 15℃ and shortest(5.75days)at 35℃ for the females,and the longest(20.00 days)at 15℃ and shortest(3.96 days)at 35℃ for the males.The highest intrinsic rate of natural increase(rm = 0.1976)and the highest finite rate of increase(λ=1.2185)were observed at 35℃.The highest sex ratio(1.73:1)and the highest net reproductive rate(R0=36.8600)were found at 25℃.And,the highest mean number of eggs(57.60 eggs per female)occurred at 25℃.
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