CEMAGREF - UR HYAX, 3275, route de Cézanne - Le Tholonet, CS 40061, 13182 Aix-en-Provence cedex 5, France.
Evolution. 2011 Feb;65(2):591-8. doi: 10.1111/j.1558-5646.2010.01134.x. Epub 2010 Oct 7.
Self-fertilization is classically thought to be associated with propagule dispersal because self-fertilization is a boon to colonizers entering environments devoid of pollinators or potential mates. Yet, it has been theoretically shown that random fluctuations in pollination conditions select for the opposite association of traits. In nature, however, various ecological factors may deviate from random variations, and thus create temporal correlation in pollination conditions. Here, we develop a model to assess the effects of pollination condition autocorrelation on the joint evolution of dispersal and self-fertilization. Basically, two syndromes are found: dispersing outcrossers and nondispersing (partial) selfers. Importantly, (1) selfers are never associated with dispersal, whereas complete outcrossers are, and (2) the disperser/outcrosser syndrome is favored (resp. disfavored) by negative (resp. positive) autocorrelation in pollination conditions. Our results suggest that observed dispersal/mating system syndromes may depend heavily on the regime of pollination condition fluctuations. We also point out potential negative evolutionary effects of anthropic management of the environment on outcrossing species.
自体受精通常与繁殖体散布有关，因为对于进入缺乏传粉者或潜在配偶的环境的殖民者来说，自体受精是一种恩赐。然而，理论上已经表明，授粉条件的随机波动选择了相反的特征关联。然而，在自然界中，各种生态因素可能偏离随机变化，从而在授粉条件中产生时间相关性。在这里，我们开发了一个模型来评估授粉条件自相关对散布和自体受精联合进化的影响。基本上，发现了两种综合征：散布的异花授粉者和不散布的（部分）自体受精者。重要的是，（1）自体受精者从不与散布有关，而完全的异花授粉者有，并且（2）授粉条件的负（正）自相关有利于（不利于）散布者/异花授粉者综合征。我们的结果表明，观察到的散布/交配系统综合征可能严重依赖于授粉条件波动的规律。我们还指出了人为管理环境对异交物种的潜在负面进化影响。
