保护加州圣克莱门特岛特有珍稀植物的重要传粉物种

Q3 Agricultural and Biological Sciences Journal of Pollination Ecology Pub Date : 2023-11-14 DOI:10.26786/1920-7603(2023)729
Jenny Hazlehurst, Stephanie Calloway, Denise Knapp
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引用次数: 0

摘要

在加利福尼亚植物区,人们花了很多精力来保护稀有、受威胁和濒临灭绝的植物,但对它们的传粉者的身份知之甚少。本文首次对加利福尼亚海峡群岛最南端的圣克莱门特岛5种珍稀特有岛屿植物Delphinium variegatum ssp kinkiense、Lithophragma maximum、Malacothamnus clementinus、Malva asgentiflora ssp glabra和Sibara filifolia的无脊椎传粉者身份进行了正式研究。采用定时扫网法调查了各焦点植物种群中植物与传粉者的相互作用。利用传粉者捕获数据构建各植物种群的双部相互作用网络,并计算传粉者的中心性指数(度、中间中心性和接近中心性),以确定对网络稳定性重要的物种。研究发现,传粉者分类群(苍蝇、蜜蜂、黄蜂和鳞翅目)对相互作用网络中传粉者中心性的一些指标有显著影响,并且在不同地点之间传粉者中心性的变化也有显著影响。食蚜蝇、飞蛾和蝴蝶是重要的通才,在所有植物种群中具有较高的网络中心性,而蜜蜂在其网络中倾向于更专业,除了Malva asgentiflora ssp glabra网络,蜜蜂的平均中心性高于苍蝇。我们建议在未来的研究中采取有针对性的恢复措施,这些措施可以直接或间接地支持传粉,从而在植物种群中重点保护稀有植物物种。这些做法可以加强一般的传粉媒介保护最佳做法,如减少农药使用和种植本地植物物种,以增加对濒危植物的授粉。
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Important pollinator species for conserving rare plant species endemic to San Clemente Island, California
Much effort has been spent on the conservation of rare, threatened, and endangered plants in the biodiversity hotspot of the California Floristic Province, however little is known about the identity of their pollinators. In this study we provide the first formal study on the identity of the invertebrate pollinators of five rare endemic island plant species from San Clemente Island, the southernmost of the California Channel Islands: Delphinium variegatum ssp kinkiense, Lithophragma maximum, Malacothamnus clementinus, Malva assurgentiflora ssp glabra, and Sibara filifolia. We surveyed plant-pollinator interactions at populations of each focal plant species using timed sweep-netting. We used pollinator capture data to compile bipartite interaction networks for each plant population, and calculated centrality indices (degree, betweenness centrality, and closeness centrality) of pollinators to identify species important to network stability. We found a significant effect of pollinator taxonomic group (fly, bee, wasp, or Lepidopteran) on some indices of pollinator centrality in interaction networks, and variation in pollinator centrality between different locations. Hoverflies, moths, and butterflies were important generalists with higher network centrality across all plant populations, while bees tended to be more specialists within their networks, except for the Malva assurgentiflora ssp glabra network, where bees were on average of higher centrality than flies. We recommend targeted restoration practices for future study that could support pollination both directly and indirectly to focal rare plant species of conservation interest across plant populations. These practices could augment general pollinator conservation best practices such as reducing pesticide use and planting native plant species to provide increased pollination to endangered plants.
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来源期刊
Journal of Pollination Ecology
Journal of Pollination Ecology Environmental Science-Ecology
CiteScore
1.50
自引率
0.00%
发文量
17
审稿时长
17 weeks
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