Importance of assessing population genetic structure before eradication of invasive species: Examples from insular Norway rat populations
Importance of assessing population genetic structure before eradication of invasive species: Examples from insular Norway rat populations
复制标题
DOI：
10.1111/j.1523-1739.2005.00206.x
复制
发表时间：
2005-10-01
影响因子：
6.3
通讯作者：
Samadi, S
中科院分区：
文献类型：
--
作者：
Abdelkrim, J;Pascal, M;Samadi, S
确定有害生物物种的岛屿间迁移能力和划定根除单位，使更可行的长期根除运动，因为从邻近岛屿的经常性殖民化是避免的。我们研究了入侵挪威大鼠（Rattus norvegicus）的遗传结构，以确定岛屿之间的基因流，并在不同的地理尺度上划分种群单位。我们调查了来自18个岛屿的大鼠种群中8个微卫星位点的变异，这些岛屿代表了布列塔尼海岸（法国）外的5个群岛。虽然大多数岛屿是相互隔离的，短的遗传距离，较弱的F-ST值之间的密切岛屿，和高水平的交叉分配表明，在不同的岛屿收集的个人可以代表一个单一的人口单位。贝叶斯聚类方法也支持一些邻近岛屿之间存在大量基因流动。因此，当岛屿之间的距离小于几百米时，“一个岛屿等于一个人口”的说法可能是错误的。遗传学研究使人们能够确定其中可能发生移民的岛屿群，这些岛屿群应被视为根除单位。为了避免再次入侵，并尽量减少生态和经济成本，在一个消灭单位的所有岛屿上的老鼠应该同时消灭。我们建议，我们在这里进行的遗传监测可以应用于任何害虫的管理。
Determining the inter-island migration abilities of pest species and delimiting eradication units enable more viable long-term eradication campaigns because recurrent colonization from neigbboring islands is avoided. We examined the genetic structure of the invasive Norway rat (Rattus norvegicus) to identify gene flow between islands and delimit population units at different geographical scales. We investigated variation in eight microsatellite loci in rat populations from 18 islands, representing five archipelagos off the Brittany coast (France). Although most of the islands are isolated from each other, short genetic distances, weak F-ST values between close islands, and a high level of cross-assignments showed that individuals collected on different islands could represent a single population unit. A Bayesian clustering method also supported the existence of big levels of gene flow between some neighboring islands. Thus, the statement "one island equals one population" can be false when inter-island distances are less than a few hundred meters. Genetic studies enable the definition of island clusters among which migration may occur that should be considered eradication units. To avoid reinvasion and to minimize ecological and economic costs, rats on all islands in an eradication unit should be eradicated simultaneously. We suggest that the genetic monitoring we performed here can be applied for management of any pest.