巴氏新小绥螨对同一栖息地枸杞瘿螨的捕食功能反应

Functional response of Neoseiulus barkeri to Aceria pallida from the same Goji habitat

枸杞瘿螨Aceria pallida Keifer(Acari:Eriophyoidae)是枸杞上为害最严重的有害生物之一。近期在内蒙古地区发现植绥螨巴氏新小绥螨Neoseiulus barkeri Hughes(Acari:Phytoseiidae)与枸杞瘿螨可同时发生在野生枸杞上。为评价巴氏新小绥螨对枸杞瘿螨的捕食潜力,本研究在室内25±1℃、RH 65%±10%、16 L∶8 D的条件下,研究了巴氏新小绥螨对不同密度枸杞瘿螨成螨(30、50、70、90、110、130、150、170头)的捕食功能反应及搜寻效应。结果表明,巴氏新小绥螨的雌、雄成螨对枸杞瘿螨成螨的捕食功能反应均为Holling-II型,即巴氏新小绥螨雌、雄成螨的捕食量随着猎物密度的增加而增加,一直到猎物密度较高时趋于稳定;而巴氏新小绥螨雌、雄成螨的搜寻效应随着猎物密度的增加而降低。巴氏新小绥螨雌成螨对相同密度下的枸杞瘿螨成螨的捕食量均高于雄成螨,而且雌成螨的搜寻效应也强于雄成螨。巴氏新小绥螨雌成螨的攻击率(α=4.4121)高于雄成螨(α=2.4403),而雌成螨的处理时间(T_(h)=0.0094 d)短于雄成螨(T_(h)=0.0196 d);雌、雄成螨的理论最大日捕食量(T/T_(h))分别为106.61头和51.02头。研究结果显示巴氏新小绥螨对枸杞瘿螨有较好的捕食潜力,性别对巴氏新小绥螨捕食枸杞瘿螨的功能反应有显著影响。

Aceria pallida Keifer is one of the most serious important pests of Lycium barbarum L.The phytoseiid mite,Neoseiulus barkeri Hughes,was recently found to co-occur with A.pallida on wild goji berry plants in Inner Mongolia.To evaluate the predation potential of N.barkeri against A.pallida,the functional response and searching efficiency of N.barkeri to adults of A.pallida with different densities(30,50,70,90,110,130,150,170 individuals)were studied under the conditions of 25±1℃,60%±5%RH and a photoperiod of 16L∶8 D in laboratory.The results showed that both female and male N.barkeri displayed a type Holling-II functional response to A.pallida.The consumption of female and male adults of N.barkeri increased with an increase in prey density until it stabilized at higher prey densities.The searching efficiency of female and male adults of N.barkeri decreased with an increase in prey density.The number of A.pallida consumed by female N.barkeri was higher than that by male N.barkeri at each prey density,whereas the searching efficiency of female N.barkeri was stronger than that of male N.barkeri.The female N.barkeri had a higher attack rate and a shorter handling time(α=4.4121;T h=0.0094 d)than male N.barkeri(α=2.4403;T h=0.0196 d).The theoretical maximum daily predation(T/T h)of female and male adults was 106.61 and 51.02,respectively.These results suggested that N.barkeri had a promising predation potential for the control A.pallida.The functional response of N.barkeri to A.pallida was significant difference between female and male N.barkeri.