Gómez José M
Dpto Biología Animal y Ecología, Universidad de Granada, 18071 Granada, Spain.
Oecologia. 2005 Apr;143(3):412-8. doi: 10.1007/s00442-004-1809-7. Epub 2005 Jan 28.
In this study, the non-additivity of effects of herbivores and pollinator on fitness of the plant Erysimum mediohispanicum (Cruciferae) has been experimentally tested. The abundance and diversity of the pollinator assemblage of plants excluded from and exposed to mammalian herbivores, and the combined effect of pollinators and herbivores on plant reproduction were determined over a period of 2 years. Pollinator abundance was higher and diversity was lower on plants excluded from herbivores. Furthermore, the experimental exclusions demonstrated that both pollinators and herbivores affected plant fitness, but their effects were not independent. Herbivores only had a detrimental effect on plant fitness when pollinators were present. Similarly, pollinators enhanced fitness only when herbivores were excluded. This outcome demonstrates that the importance of pollinators for plant fitness depends on the occurrence of herbivores, and suggests that herbivores may hamper pollinator-mediated adaptation in plants.
在本研究中，已通过实验测试了食草动物和传粉者对植物中西班牙沟子芥（十字花科）适合度影响的非加性效应。在两年时间里，确定了未遭受和遭受哺乳动物食草动物侵害的植物传粉者组合的丰度和多样性，以及传粉者和食草动物对植物繁殖的综合影响。未遭受食草动物侵害的植物上，传粉者丰度较高而多样性较低。此外，实验排除表明传粉者和食草动物均影响植物适合度，但它们的影响并非独立。只有在有传粉者存在时，食草动物才对植物适合度产生有害影响。同样，只有在排除食草动物时，传粉者才会提高适合度。这一结果表明传粉者对植物适合度的重要性取决于食草动物的存在，并表明食草动物可能会阻碍植物中传粉者介导的适应性。
