Sequential Sympatric Speciation Across Trophic Levels
Sequential Sympatric Speciation Across Trophic Levels
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DOI：
10.1126/science.1166981
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发表时间：
2009-02-06
期刊：
影响因子：
56.9
通讯作者：
Feder, Jeffrey L.
中科院分区：
文献类型：
--
作者：
Forbes, Andrew A.;Powell, Thomas H. Q.;Feder, Jeffrey L.
生物多样性的一个主要原因可能是生物多样性本身。随着新物种的形成，它们可能会为其他物种创造新的生态位，从而可能催化跨营养级的物种形成事件的连锁反应。我们测试了这样的顺序辐射在Rhagoletis pomonella（双翅目：实蝇科）复杂，同域物种形成通过宿主植物转移的模型。本文报道了寄生蜂Diachasma alloeum（膜翅目：茧蜂科）由于专化寄主的多样性而形成了新的初期种，其中包括最近衍生的苹果害虫小蜂R.苹果属此外，我们表明，差异适应R。苹果蠹蛾飞向它们的寄主植物也迅速进化，并成为繁殖的生态屏障，隔离了黄蜂。因此，随着新生态位构建的影响跨越营养级，物种形成级联。
A major cause for biodiversity may be biodiversity itself. As new species form, they may create new niches for others to exploit, potentially catalyzing a chain reaction of speciation events across trophic levels. We tested for such sequential radiation in the Rhagoletis pomonella ( Diptera: Tephritidae) complex, a model for sympatric speciation via host plant shifting. We report that the parasitic wasp Diachasma alloeum ( Hymenoptera: Braconidae) has formed new incipient species as a result of specializing on diversifying fly hosts, including the recently derived apple- infesting race of R. pomonella. Furthermore, we show that traits that differentially adapt R. pomonella flies to their host plants have also quickly evolved and serve as ecological barriers to reproduction, isolating the wasps. Speciation therefore cascades as the effects of new niche construction move across trophic levels.