Community context mediates effects of pollinator loss on seed production
Community context mediates effects of pollinator loss on seed production
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社区背景介导传粉媒介丧失对种子生产的影响
DOI：
10.1002/ecs2.4569
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发表时间：
2023
期刊：
影响因子：
2.7
通讯作者：
Brosi, Berry J.
中科院分区：
文献类型：
--
作者：
Arrowsmith, K. C.;Reynolds, Victoria A.;Briggs, Heather M.;Brosi, Berry J.
生态学家的一个关键目标是了解正在进行的本地和全球物种损失将如何影响生态系统的功能和服务。多样性功能关系在初级生产者群落中有很好的特征，但在涉及两个或更多营养级的生态系统功能中，尤其是在一个营养级的多个物种影响另一个营养级的功能结果的情况下，其可预测性要差得多。考虑到传粉媒介的持续减少以及了解作物或受威胁植物等单一植物物种的传粉功能的价值，这与传粉功能尤其相关。在美国科罗拉多州落基山脉，我们采用空间复制、受控的单传粉者物种去除实验来评估大黄蜂物种丰富度的变化如何影响多年生草本植物飞燕草（delphinium barbeyi）的受精种子生产。为了提高可预测性，我们还评估了植物和大黄蜂群落的性状和丰度与d的关系。barbeyireproductive成功。我们假设传粉者的喙长与d。Barbeyi的花蜜刺会产生更多的受精种子，而花群落内部的形态相似性会稀释授粉服务。研究发现，去除传粉媒介的效果取决于传粉媒介的行为模式和植物和传粉媒介群落的组成特征。而传粉者花的保真度普遍增加。在实验中，当超过一半的树蜂群落被移除时，这种积极的影响主要是明显的。同样，主要由长舌蜜蜂组成的群落对d最有利。Barbeyiseed生产串联强去除。最后，我们观察了植物群落中形态相似性的对比效应，证明了植物之间的竞争和促进。这些结果为多营养系统生态系统功能的复杂动态提供了一个例子，并证明了群落背景可以影响营养水平之间的多样性功能关系。
A critical goal for ecologists is understanding how ongoing local and global species losses will affect ecosystem functions and services. Diversity–functioning relationships, which are well‐characterized in primary producer communities, are much less consistently predictable for ecosystem functions involving two or more trophic levels, particularly in situations where multiple species in one trophic level impact functional outcomes at another trophic level. This is particularly relevant to pollination functioning, given ongoing pollinator declines and the value of understanding pollination functioning for single plant species like crops or threatened plants. We used spatially replicated, controlled single‐pollinator‐species removal experiments to assess how changes in bumble bee species richness impacted the production of fertilized seeds in a perennial herb—Delphinium barbeyi—in the Rocky Mountains of Colorado, USA. To improve predictability, we also assessed how traits and abundances in the plant and bumble bee communities were related toD. barbeyireproductive success. We hypothesized that trait‐matching between pollinator proboscis length andD. barbeyi's nectar spurs would produce a greater number of fertilized seeds, while morphological similarity within the floral community would dilute pollination services. We found that the effects of pollinator removal differed depending on the behavioral patterns of pollinators and compositional features of the plant and pollinator communities. While pollinator floral fidelity generally increasedD. barbeyiseed production, that positive effect was primarily evident when more than half of theBombuscommunity was experimentally removed. Similarly, communities comprising primarily long‐tongued bees were most beneficial toD. barbeyiseed production in tandem with a strong removal. Finally, we observed contrasting effects of morphological similarity in the plant community, with evidence of both competition and facilitation among plants. These results offer an example of the complex dynamics underlying ecosystem function in multitrophic systems and demonstrate that community context can impact diversity–functioning relationships between trophic levels.
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