Sources, sinks, and the zone of influence of refuges for managing insect resistance to Bt crops
Sources, sinks, and the zone of influence of refuges for managing insect resistance to Bt crops
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DOI：
10.1890/03-5268
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发表时间：
2004-12-01
影响因子：
5
通讯作者：
Tabashnik, BE
中科院分区：
文献类型：
--
作者：
Carrière, Y;Dutilleul, P;Tabashnik, BE
避难所策略是推迟昆虫对产生苏云金芽孢杆菌(Bt)毒素的转基因作物的抗性的核心，但确定有效的避难所空间布局一直是个问题。我们开发了一种空间上明确的、基于人口统计学的方法来估计避难所的影响区域，即避难所增加昆虫种群密度的区域。该方法依赖于全球定位系统(GPS)和地理信息系统(GIS)技术，并结合空间统计。我们连续两年将其应用于亚利桑那州的粉红铃虫种群，这是一种主要的棉花害虫。在所研究的两年中，距离转Bt基因棉0.75公里或更少的避难所具有最大的延缓抗性的潜力。然而，避难所的影响范围在不同年份和不同地点之间有所不同。与非Bt棉相比，Bt棉高丰度地感虫密度显著低于低丰度地。因此，Bt作物相对于非Bt作物的丰度可能会影响避难所的有效性。我们的空间显式方法考虑了这种源-汇动态，因此非常适合于帮助确定应该如何部署避难所。
The refuge strategy is central for delaying insect resistance to transgenic crops that produce Bacillus thuringiensis (Bt) toxins, but determining an effective spatial configuration of refuges has been problematic. We developed a spatially explicit, demographically based method for estimating the zone of influence of refuges, the area over which refuges increase an insect's population density. The method relied on global positioning system (GPS) and geographic information system (GIS) technologies combined with spatial statistics. We applied it in two successive years to Arizona populations of pink bollworm, a major cotton pest. Refuges at 0.75 km or less from Bt cotton had the greatest potential for delaying resistance in both years studied. However, the zone of influence of refuges varied between years and among sites. The density of susceptible moths was significantly lower at sites with high compared to low abundance of Bt cotton relative to non-Bt cotton. Thus, abundance of a Bt crop relative to a non-Bt crop may influence the effectiveness of refuges. Our spatially explicit approach takes such source-sink dynamics into account and hence is well suited to help determine how refuges should be deployed.