期刊
ECOLOGY AND EVOLUTION
卷 9, 期 18, 页码 10176-10184出版社
WILEY
DOI: 10.1002/ece3.5520
关键词
biotic interactions; Datura stramonium; invasive species; selection of plant defence; tropane alkaloids
资金
- Direccion General de Asuntos del Personal Academico, Universidad Nacional Autonoma de Mexico [IG200717]
Theories of plant invasion based on enemy release in a new range assume that selection exerted by specialist herbivores on defence traits should be reduced, absent, or even selected against in the new environment. Here, we measured phenotypic selection on atropine and scopolamine concentration of Datura stramonium in eight native (Mexico) and 14 non-native (Spain) populations. Native populations produced between 20 and 40 times more alkaloid than non-native populations (atropine: 2.0171 vs. 0.0458 mg/g; scopolamine: 1.004 vs. 0.0488 mg/g, respectively). Selection on alkaloids was negative for atropine and positive for scopolamine concentration in both ranges. However, the effect sizes of selection gradients were only significant in the native range. Our results support the assumption that the reduction of plant defence in the absence of the plant's natural enemies in invasive ranges is driven by natural selection.
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