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Non-native plants and nitrogen addition have little effect on pollination and seed set in 3-year-old restored woodland
Austral Ecology ( IF 1.5 ) Pub Date : 2020-08-31 , DOI: 10.1111/aec.12949
Bridget Johnson 1 , Rachel Standish 2 , Richard Hobbs 1
Affiliation  

Human activities can disrupt the insect pollination process, which can trigger a decline in pollination and plant reproductive output. Floral visitors are not equally effective pollinators, and it is unknown how multiple changes to an environment further change the effectiveness of insect pollination for native plants. We investigated how herbicide treatment, the presence of non‐native plants and addition of nitrogen fertiliser change the relative importance of different species of floral visitors to four native plant species: Callistemon phoeniceus, Calothamnus quadrifidus, Hakea lissocarpha and Banksia sessilis. Our field site was a large‐scale revegetation site in south‐west Western Australia in which the presence of non‐native plants and nitrogen deposition were experimentally manipulated. Experimental exclusion of floral visitors revealed pollinators were likely required for the seed set of three of the native species, and none of the four plant species were pollen‐limited. We observed 8936 floral visitors of 249 morphospecies from 14 insect orders on four native and two non‐native plant species. From PIV calculations, 57% of floral visitors were potential pollinators, with the remainder considered just visitors due to their low Pollinator Importance Value (PIV). The introduced Apis mellifera (European honey bee, Apidae) was the most frequent floral visitor and the most effective pollinator of all four native plant species. The presence of two non‐native plant species and addition of nitrogen fertiliser did not affect the effectiveness of the potential pollinators, or the viable seeds produced by the four native plant species.

中文翻译:

非本地植物和氮添加对 3 年生恢复林地授粉和结籽影响不大

人类活动会扰乱昆虫的授粉过程,从而导致授粉和植物繁殖能力下降。花卉访客并不是同样有效的传粉者,并且不知道环境的多重变化如何进一步改变昆虫对本地植物传粉的有效性。我们调查了除草剂处理、非本地植物的存在和氮肥的添加如何改变不同种类的花卉访客对四种本地植物物种的相对重要性:Callistemon phoeniceus、Calothamnus quadrifidus、Hakea lissocarpha 和 Banksia sessilis。我们的野外场地是西澳大利亚西南部的一个大规模重新植被场地,其中非本地植物的存在和氮沉积被实验操纵。对花卉访客的实验排除表明,三种本地物种的种子组可能需要传粉媒介,并且四种植物物种中没有一种是花粉限制的。我们观察了来自 14 个昆虫目的 249 个形态种的 8936 名花卉访客,这些访问者来自四种本地植物和两种非本地植物物种。根据 PIV 计算,57% 的花卉访客是潜在的传粉媒介,其余的由于传粉媒介重要性值 (PIV) 较低而仅被视为访客。引入的Apis mellifera(欧洲蜜蜂,Apidae)是所有四种本地植物物种中最常见的花卉访客和最有效的传粉者。两种非本地植物物种的存在和氮肥的添加不会影响潜在传粉媒介的有效性,或四种本地植物物种产生的有活力的种子。
更新日期:2020-08-31
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