盗蜜行为在植物繁殖生态学中的意义

doi:10.17521/cjpe.2006.0091

摘要/Abstract

摘要：

在动植物的相互关系中,盗蜜行为被认为是一种不同于普通传粉者的非正常访花行为。动物之所以要采取这种特殊的觅食策略,有假说认为是由访花者的口器和植物的花部形态不匹配造成的,也有认为是盗蜜行为提高了觅食效率从而使盗蜜者受益。在盗蜜现象中,盗蜜者和宿主植物之间的关系是复杂的。盗蜜对宿主植物的影响尤其是对其繁殖适合度的影响归纳起来有正面、负面以及中性3类。与此同时,盗蜜者的种类, 性别及其掠食行为差异不仅与生境因素密切相关,而且会对宿主植物的繁殖成功产生直接或间接的影响。另外,盗蜜者的存在无疑对其它正常传粉者的访花行为也产生一定的影响,从而间接地影响宿主植物的繁殖成功, 而植物在花部形态上也出现了对盗蜜现象的适应性进化。作者认为, 盗蜜是短嘴蜂对长管型花最有效的一种掠食策略, 它不仅增加了盗蜜者对资源的利用能力, 而且由于盗蜜对宿主植物繁殖成功的不同的影响使其具有调节盗蜜者和宿主之间种群动态的作用, 两者的彼此适应是一种协同进化的结果。

关键词: 植物繁殖生态学, 盗蜜现象, 宿主植物, 正常传粉者, 繁殖适合度

Abstract:

The relationship between plant and pollinator is considered as a mutualism because plant benefits from the pollinator's transport of male gametes. Nectar robbers are frequently described as cheaters in the plant-pollinator mutualism, because it is assumed that they obtain a reward (nectar) without providing a service (pollination). Nectar robbers are birds, insects, or flower visitors that remove nectar from flowers through a hole pierced or bitten in the corolla. Nectar robbing represents a complex relationship between animals and plants. Whether plants benefit from the relationship is always the controversial part in earlier studies. This paper is to review the recent literatures on nectar robbing and attempt to acquire an expanded understanding of the ecological and evolutionary roles that robbers play. Understanding the effects of nectar robbers on the plants that they visited and other flower visitors is especially important when one considers the high rates of robbing that a plant population may experience and the high percentage of all flower visitors that nectar robbers make to some species.
There are two standpoints in explaining why animals forage on flowers and steal nectar in an illegitimate behavior. One is that animals can only get food in illegitimate's way because of the mismatch of the morphologies of animals' mouthparts and floral structure. The other point of view argues that nectar robbing is a relatively more efficient, thus more energy-saving way for animals to get nectar from flowers. This is probably associated with the difficulty of changing attitudes that have been held for a long time. In the case of positive effect, the bodies of nectar robbers frequently touch the sex organs of plants during their visiting to the flowers and causing pollination. The neutral effect, nectar robbers' behavior may destruct the corollas of flowers, but they neither touch the sex organs nor destroy the ovules. Their behavior don't affect the fruit sets or seed sets of the hosting plant. Beside the direct impacts on plants, nectar robbers may also have an indirect effect on the behavior of the legitimate pollinators. In some circumstances, the change in pollinator behavior could result in improved reproductive fitness of plants through increased pollen flow and out-crossing.

Key words: Plant reproductive ecology, Nectar robbing, Host, Legitimate pollinator, Reproductive fitness

张彦文, 王勇, 郭友好. 盗蜜行为在植物繁殖生态学中的意义. 植物生态学报, 2006, 30(4): 695-702. DOI: 10.17521/cjpe.2006.0091

ZHANG Yan-Wen, WANG Yong, GUO You-Hao. THE EFFECTS OF NECTAR ROBBING ON PLANT REPRODUCTION AND EVOLUTION. Chinese Journal of Plant Ecology, 2006, 30(4): 695-702. DOI: 10.17521/cjpe.2006.0091

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