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首页> 外文期刊>Plant Systematics and Evolution >Ambophily, not entomophily: the reproduction of the perennial Discaria chacaye (Rhamnaceae: Colletieae) along a rainfall gradient in Patagonia, Argentina
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Ambophily, not entomophily: the reproduction of the perennial Discaria chacaye (Rhamnaceae: Colletieae) along a rainfall gradient in Patagonia, Argentina

机译：伏击，没有诱人：沿着巴塔哥尼亚巴塔哥尼亚的降雨梯度繁殖常年溃疡性Chacaye（rhamnaceae：colletieae）的繁殖

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摘要

Geographical gradients are useful tools for studying how changing environmental conditions affect communities' structure and function, and any perceived general pattern can be tested by examining the response of different populations of a given species widely distributed along the focal gradient. We studied populations of the perennial, putatively entomophilous plant Discaria chacaye located along a strong east-west rainfall gradient in the north-west of Patagonia, Argentina, where a significant community-level eastwards replacement of Diptera by Hymenoptera as main flower visitors takes place. Discaria chacaye showed an invariant set of traits (flowers rewarding with nectar and pollen a fly-dominated pollinator assemblage, combined with protandry, incomplete dichogamy and self-incompatibility) which were modulated by site-dependent factors (availability of pollinators, wind strength, and perhaps abundance of seed predators). The interplay between all factors resulted in an increase in fruit set from the wet to the dry end of the gradient. Unexpectedly, wind was found to be an important pollen transporter, while (a) the plant's use of pollinator groups was mostly uncorrelated with their local abundances along the gradient, and (b) both pre-and postzygotic fecundity losses occurred, mostly attributable to geitonogamy. The finding of ambophily in D. chacaye suggests that this pollination strategy could be more frequent than previously suspected along the studied gradient.
机译：地理梯度是研究改变环境条件如何影响社区结构和功能的有用工具，并且可以通过检查不同群体广泛分布沿着焦梯度的不同群体的响应来测试任何感知一般图案。我们研究了沿着阿根廷巴塔哥尼亚西北部的强大的东西雨坡，在巴塔哥尼亚西北部的强大的东西降雨梯度，在那里追求近世的社区一级，以便在大型鲜花游客举行时，以东大的社区层面替代Diptera。 Discaria Chacaye展示了一套不变的特征（花花粉奖励，花粉是捕捞占据的粉碎机组合，与Pollinator，风力强度的可用性，风力的可用性也许丰富的种子掠食者）。所有因素之间的相互作用导致从梯度的湿到干末端的水果组增加。出乎意料地，被发现风是一个重要的花粉转运蛋白，而（a）植物沿着梯度的局部丰富的局部丰富的植物群体的使用大多是不相关的，并且（b）发生前后繁殖力损失，主要归因于Geitonogamy 。在D.Chacaye中的寻找构成，这种授粉策略比以前沿着研究的梯度涉嫌更频繁。

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