Recent emergence and worldwide spread of the red tomato spider mite, Tetranychus evansi: genetic variation and multiple cryptic invasions

被引:66
作者
Boubou, Angham [1 ]
Migeon, Alain [1 ]
Roderick, George K. [2 ]
Navajas, Maria [1 ]
机构
[1] INRA, UMR CBGP INRA IRD Cirad Montpellier SupAgro, F-34988 Montferrier Sur Lez, France
[2] Univ Calif Berkeley, Berkeley, CA 94720 USA
关键词
Tetranychus evansi; Mitochondrial DNA; Emerging pest; Multiple introductions; Cryptic invasions; BEMISIA-TABACI HEMIPTERA; RIBOSOMAL ITS2 SEQUENCES; LIFE-HISTORY; BIOLOGICAL-CONTROL; MITOCHONDRIAL-DNA; EVOLUTIONARY GENETICS; POPULATION-STRUCTURE; BAYESIAN-ANALYSIS; ACARI; DIVERSITY;
D O I
10.1007/s10530-010-9791-y
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Plant biosecurity is increasingly challenged by emerging crop pests. The spider mite Tetranychus evansi has recently emerged as a new threat to solanaceous crops in Africa and the Mediterranean basin, with invasions characterized by a high reproductive output and an ability to withstand a wide range of temperatures. Mitochondrial (868 bp of COI) and nuclear (1,137 bp of ITS) loci were analyzed in T. evansi samples spanning the current geographical distribution to study the earliest stages of the invasive process. The two sets of markers separate the samples into two main clades that are only present together in South America and Southern Europe. The highest COI diversity was found in South America, consistent with the hypothesis of a South American origin of T. evansi. Among the invaded areas, the Mediterranean region displayed a high level of genetic diversity similar to that present in South America, that is likely the result of multiple colonization events. The invasions of Africa and Asia by T. evansi are characterized by a low genetic variation associated with distinct introductions. Genetic data demonstrate two different patterns of invasions: (1) populations in the Mediterranean basin that are a result of multiple cryptic introductions and (2) emerging invasions of Africa and Asia, each likely the result of propagules from one or limited sources. The recent invasions of T. evansi illustrate not only the importance of human activities in the spread of agricultural pests, but also the limits of international quarantine procedures, particularly for cryptic invasions.
引用
收藏
页码:81 / 92
页数:12
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