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首页> 外文期刊>Plant Ecology and Evolution >Comparative study of the reproductive ecology of two co-occurring related plant species: the invasive Senecio inaequidens and the native Jacobaea vulgaris
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Comparative study of the reproductive ecology of two co-occurring related plant species: the invasive Senecio inaequidens and the native Jacobaea vulgaris

机译：两种同时存在的相关植物物种的入侵生态学的比较研究：入侵千里光inaequidens和本地雅可比寻常型

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摘要

Background and aims - A previous study showed that the visitation rate by pollinators and the seed set of the exotic invasive Senecio inaequidens (Asteraceae) were higher compared to the native relative, Jacobaea vulgaris. The first aim of the presentstudy was to assess if these results could be explained by differences in self-fertility, nectar rewards or floral display between the two species. Moreover, in a second step, we examined if the higher visitation rate on S. inaequidens has a negative effect on the reproductive success of J. vulgaris. Methods - Self-fertility was estimated after self- and cross-hand pollinations. Nectar volume, total sugar concentration and sugar composition were analysed on plants cultivated under controlled conditions. In the field, in order to assess the effect of floral display and impact of the invasive on the pollination success of the native, insect behaviour was assessed by comparing visitation rates, number of visitors per 10 min observation and individual censuses. Floral display (density of capitula per unit area) was artificially modified by clipping or grouping inflorescences in both species. Key results - In terms of self-fertility, seed sets were similarly low after self-pollination (11-12%) for both species. S. inaequidens produced lower amounts of nectar with lower sugar concentration compared to J. vulgaris. No influence of floral display was detected on insect visitation rates. The presence of S. inaequidens did not alter pollinator visits and seedset of J. vulgaris. Conclusions - Other traits need to be investigated to explain the different visitation rates and reproductive success between the two species. The higher seed set of S. inaequidens could be due to a higher outcrossing rate, or more frequent pollinator movements between individuals.
机译：背景和目的-一项先前的研究表明，传粉昆虫和外来入侵千里光科（Asteraceae）的传粉者的访果率比本地亲缘种寻常（Jacobaea vulgaris）高。本研究的首要目的是评估这些结果是否可以通过两个物种之间的自我繁殖力，花蜜奖励或花饰差异来解释。此外，在第二步中，我们检查了较高的对拟南芥的探视率是否对寻常型沙门氏菌的繁殖成功产生了负面影响。方法-自我授粉和交叉授粉后估计自己的生育力。分析了在受控条件下种植的植物的花蜜量，总糖浓度和糖成分。在野外，为了评估花卉展示的效果和侵染剂对本地植物授粉成功的影响，通过比较探访率，每10分钟观察的访客数量和个人普查评估昆虫的行为。通过剪裁或分组花序在两个物种中人为地修饰了花卉展示（每单位面积capitula的密度）。关键结果-就自我繁殖力而言，两个物种自花授粉后的结实率同样较低（11-12％）。与寻常型J. J.相比，S。inaequidens产生的花蜜量和糖浓度更低。没有检测到花饰对昆虫的访视率有影响。 inaequidens的存在并没有改变寻常的J.的授粉媒介访问和种子集。结论-需要研究其他特征来解释两个物种之间不同的探视率和生殖成功。拟南芥的较高种子集可能是由于较高的异交率，或个体之间更频繁的传粉媒介移动。

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