Abstract:

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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Selection on tropane alkaloids in native and non‐native populations of <em>Datura stramonium</em>

Guillermo Castillo

Adriana Calahorra‐Oliart

Rosalinda Tapia‐López

^{Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México (UNAM), Mexico City Mexico,}

^{Departamento de Biología, Universidad Autónoma Metropolitana‐Iztapalapa, Mexico City Mexico,}

^{Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Sevilla Spain,}

^{Present address: Facultad de Enología y Gastronomía, Universidad Autónoma de Baja California, Baja California México,}

Juan Núñez‐Farfán, Email: xm.manu@nafraf.

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^{Corresponding author.}

^{Correspondence}
Juan Núñez‐Farfán, Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México (UNAM), Apartado Postal 70‐275, Mexico 04510, Mexico City, Mexico.
Email: xm.manu@nafraf,
Pedro L. Valverde, Departamento de Biología, Universidad Autónoma Metropolitana‐Iztapalapa, Apartado Postal 55‐535, Mexico 09340, Mexico City, Mexico.
Email: xm.mau.munax@pvlp,

Received 2019 May 23; Revised 2019 Jun 21; Accepted 2019 Jul 2.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Notes

Castillo G, Calahorra‐Oliart A, Núñez‐Farfán J, et al. Selection on tropane alkaloids in native and non‐native populations of Datura stramonium. Ecol Evol. 2019;9:10176–10184. 10.1002/ece3.5520 [CrossRef] [Google Scholar]

G. Castillo and A. Calahorra‐Oliart are contributed equally.

Notes

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Juan Núñez‐Farfán, Email: xm.manu@nafraf.

Pedro L. Valverde, Email: xm.mau.munax@pvlp.

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