1 Feeding the enemy: Loss of nectar and nectaries to herbivores reduces tepal 2 damage and increases pollinator attraction in Iris bulleyana 3 4 5 Ya-Ru Zhu1, Min Yang1, Jana C. Vamosi2, W. Scott Armbruster3,4, Tao Wan5 and 6 Yan-Bing Gong1 7 1 State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, 8 Wuhan 430072, China 9 2 Department of Biological Sciences, University of Calgary, Calgary T2N1N4, Canada 10 3School of Biological Sciences, University of Portsmouth, Portsmouth PO1 2DY, 11 United Kingdom 12 4Institute of Arctic Biology, University of Alaska, Fairbanks, AK 99775 USA 13 5Key Laboratory of Southern Subtropical Plant Diversity, Fairylake Botanical Garden, 14 Shenzhen 518004, China 15 16 17 Author for correspondence: Yan-Bing Gong 18 e-mail:
[email protected] 19 Floral nectar usually functions as a pollinator reward, yet it may also attract herbivores. 20 However, the effects of herbivore consumption of nectar or nectaries on pollination 21 have rarely been tested. We investigated Iris bulleyana, an alpine plant that has showy 22 tepals and abundant nectar in the Hengduan Mountains of SW China. In this region 23 flowers are visited mainly by pollen-collecting pollinators and nectarivorous herbivores. 24 We test the hypothesis that, in I. bulleyana, sacrificing nectar and nectaries to 25 herbivores protects tepals and thus enhances pollinator attraction. We compared rates 26 of pollination and herbivory on different floral tissues in plants with flowers protected 27 from nectar and nectary consumption with rates in unprotected control plants. We 28 found that nectar and nectaries suffered more herbivore damage than did tepals in 29 natural conditions.