Effects of Short-term High-temperature Exposure on Survival and Reproduction of Adult Assara inouei Yamanaka
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摘要:
目的 研究短时高温对井上蛀果斑螟Assara inouei Yamanaka成虫存活及繁殖的影响,明确该虫对高温的适应性,为准确预测预报该害虫发生提供依据。 方法 以25℃恒温为对照,将井上蛀果斑螟羽化12 h内成虫在35、38、41℃高温下,分别处理1、2、4、6 h后移至25℃适温继续饲养,观察短时高温处理后成虫的存活、寿命、产卵及卵孵化情况。 结果 成虫期短时高温处理的温度和持续时间对井上蛀果斑螟成虫的存活及繁殖有显著影响。随处理温度的升高及处理时间的延长,成虫存活率逐渐降低,寿命和产卵期逐渐缩短,单雌平均产卵量和产卵高峰期产卵量亦逐渐减少,卵孵化率下降,但产卵前期无明显变化。其中,35℃处理1、2 h成虫的存活率、寿命、产卵前期、卵孵化率和对照无显著差异,而产卵期和单雌平均产卵量与对照差异显著。41℃处理4、6 h成虫的存活率、寿命、产卵前期、产卵期、单雌平均产卵量、卵孵化率较对照及35℃相同时间处理差异显著。 结论 短时高温对井上蛀果斑螟成虫的存活及繁殖有不利影响,且随温度的升高和处理时间的延长,影响程度加剧。 Abstract:Objective Effects of short-term high-temperature exposure on survival and reproduction of adult Assara inouei Yamanaka were studied to determine the thermal adaptation of the insect for population control. Method Within 12 h of emergence, adult A. inouei were exposed to 25℃ (CK), 35℃, 38℃, or 41℃ for 1 h, 2 h, 4 h, or 6 h, then moved to a 25°C chamber for feeding and observation. The survival rate, lifespan, fecundity, and egg hatching rate of the insects were monitored. Result Both temperature and duration of the exposures significantly affected the survival and reproduction of A. inouei. The increased temperature and prolonged exposure caused a gradual decline on the survival rate, lifespan, and oviposition of the insects. The average number of eggs laid per female and that at the peak egg-laying period decreased gradually, and the egg hatching rate decreased as well. But the pre-oviposition period was not significantly altered. Exposure to 35°C for 1 h and 2 h did not cause significant differences on the survival rate, lifespan, pre-oviposition period or egg hatching rate, as compared to CK. But it significantly affected the female oviposition period and average number of eggs laid per individual insect. On the other hand, after being exposed to 41°C for 4 h or 6 h, the insects sustained a significantly lower survival rate, lifespan, pre-oviposition and oviposition periods, number of eggs laid per female, and egg hatching rate than those of CK. Conclusion Exposure to a rising temperature up to 41°C in a duration of 4 h to 6 h could be significantly detrimental to the survival and fecundity of adult A. inouei. -
图 1 成虫期短时高温处理后井上蛀果斑螟的产卵前期和产卵期
注:图中数据为平均值±标准误;同一类型柱上不同小写字母表示差异显著(P<0.05)。图2和图4同。
Figure 1. Pre-oviposition and oviposition periods of adult A. inouei after high-temperature exposures
Note: Data are means±SE. Data followed by different letters in a same category indicate significant difference at 0.05 level. Same for Fig. 2 and 4.
表 1 成虫期短时高温处理后井上蛀果斑螟成虫的存活率和寿命
Table 1. Survival rate and lifespan of adult A. inouei after high-temperature exposures
温度
Temperature/℃处理时间
Exposure duration/h存活率 Survival rate/% 成虫寿命 Longevity of adult/d ♀ ♂ ♀ ♂ 35 1 96.31±2.56 a 90.59±1.78 a 14.67±0.87 a 15.62±1.52 a 2 95.25±3.43 a 89.23±0.35 a 14.54±0.65 a 15.30±0.70 a 4 94.67±1.52 a 85.28±2.15 a 13.33±1.53 a 12.64±0.16 b 6 92.39±3.04 ab 78.59±1.57 b 11.45±1.46 b 11.67±0.55 bc 38 1 93.27±2.54 ab 88.57±2.32 a 11.67±0.79 b 12.06±0.32 b 2 90.13±1.83 b 86.24±1.35 a 12.15±1.00 b 11.33±0.55 bc 4 86.52±2.9 bc 80.59±1.54 b 11.08±0.43 b 10.83±0.62 c 6 85.29±1.45 bc 81.48±1.6 b 8.67±0.58 c 7.52±0.43 d 41 1 87.13±2.02 bc 79.35±2.16 b 6.20±0.26 cd 5.64±0.16 e 2 83.33±1.37 c 80.17±1.47 b 5.04±0.10 d 5.17±0.58 e 4 74.25±2.43 d 75.49±1.05 bc 4.63±0.38 d 6.18±0.21 de 6 70.17±1.84 d 71.58±2.31 c 5.37±0.60 d 4.33±0.38 e 25(CK) 96.23±2.56 a 94.68±2.56 a 14.32±0.74 a 15.39±0.24 a 注:表中数据为平均值±标准误;同列数据后不同小写字母表示差异显著(P<0.05)。
Note: Data are means ± SE. Data followed by different letters within a column idicate significant difference at 0.05 level. -
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