Yu H, Frommer M, Robson M K, Meats A W, Shearman D C, Sved J A
Fruit Fly Research Centre, School of Biological Sciences A12, University of Sydney, NSW 2006, Australia.
Bull Entomol Res. 2001 Apr;91(2):139-47.
The population structure of a tephritid pest species, the Queensland fruit fly Bactrocera tryoni (Froggatt), has been analysed over a five year period (1994-1998), using six microsatellites. Adult fly samples were collected to cover most regions of eastern and central Australia where the flies are regularly found. Tests for heterogeneity indicated that flies within geographically defined regions were homogeneous. The samples were allocated into five regions, including one very large region, Queensland, which encompasses that portion of the fly's range where breeding can occur year-round. With one exception, the collections from different regions were homogeneous between years, showing a fairly static distribution of the species. However, differences between regions were highly significant. The one case of a change in frequency between years indicated a gradual replacement of flies in a marginal region by flies from the main part of the range. The finding of stability in the distribution of a highly mobile insect is of interest, potentially also for other species which have expanded beyond their native range. It is argued that a contributing reason for this stability may be adaptation to different climatic regimes, and that strategies for control based on this hypothesis afford a reasonable chance of success.
在五年期间（1994 - 1998年），利用六个微卫星对一种实蝇害虫——昆士兰果蝇Bactrocera tryoni（弗罗加特）的种群结构进行了分析。采集了成年果蝇样本，覆盖了澳大利亚东部和中部果蝇经常出现的大部分地区。异质性测试表明，地理界定区域内的果蝇是同质的。样本被划分为五个区域，其中包括一个非常大的区域——昆士兰，该区域涵盖了果蝇全年都可繁殖的分布范围。除了一个例外，不同区域的采集样本在年份之间是同质的，表明该物种分布相当稳定。然而，区域之间的差异非常显著。年份之间频率变化的一个案例表明，边缘区域的果蝇逐渐被分布范围主要部分的果蝇所取代。对于一种高度移动的昆虫，其分布具有稳定性这一发现很有意思，对于其他已扩散到其原生范围之外的物种可能也具有潜在意义。有人认为，这种稳定性的一个促成原因可能是对不同气候条件的适应，并且基于这一假设的控制策略有合理的成功机会。
