中国-喜马拉雅三种黄耆植物与传粉熊蜂的空间分布预测

	中国-喜马拉雅三种黄耆植物与传粉熊蜂的空间分布预测; Predicting the spatial distribution of three Astragalus species and their pollinating bumblebees in Sino-Himalayas
	施雨含
导师	王红
摘要	Species distribution is constrained by biotic and abiotic factors. For plant species which relying on animal pollination for reproduction, their spatial distribution is influenced by the geographical distribution of their pollinators. Climate warming has caused different changes in the geographical distribution of plants and pollinators, which could result in decrease or loss of spatial overlap in some regions for interacting partners. Predicting the impact of future climate change on the geographical distribution of plant and insect interacting species has important significance for biodiversity conservation. In this study, we conducted a field investigation of three Astragalus species and their dominant pollinating bumblebees, and we collected 543 species distribution points of Astragalus (A. camptodontus, A. pullus and A. strictus) and Bombus and 13 environmental factors from the historical database. We used MaxEnt to simulate the suitable distribution change of three Astragalus species and two pollinating bumblebees (B. friseanus and B. rufofasciatus) at near current and 2100s two greenhouse gas concentrations scenarios (ssp245 and ssp585) combined with two possible migration situations, i.e. full dispersal and no dispersal. The main results and conclusions are as follows. 1. Pollinating insects of three Astragalus species and diversity of pollinators The three Astragalus species have a generalist pollination system with multiple species of Bombus and Apis cerana as pollinators. The main pollinators are bumblebees, accounting more than 80% of the total number of pollinators. There was no significant difference in the diversity of pollinating bumblebees among different Astragalus populations. The similarity coefficient of species composition between two populations of A. camptodontus and A. pullus was generally high. For A. strictus, the species composition of pollinating bumblebees was different among different populations. With the increased of elevation, species turnover increased gradually, and there was species turnover among populations. Based on the species abundance, the cluster analysis of pollinating bumblebees among different populations of A. strictus showed that the pollinating bumblebees were more likely to be clustered into one group among populations with similar elevations of A. strictus. The results showed that the pollinating bumblebees richness and species composition of A. strictus was related to elevation. . Bag mark experiment showed that the seed setting rate of A. camptodontus and A. pullus under natural condition were significantly higher than bagging treatment ( ), and the seed setting rate of bagging treatment was lower, which indicated that the fruit and seed production of A. camptodontus and A. pullus depended on pollination of pollinators, and they might have self incompatible breeding system. For Astragalus which depend on pollinators to reproduce successfully, the geographical distribution of pollinators shou
	2020-08
文献类型	学位论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74172
专题	昆明植物所硕博研究生毕业学位论文
推荐引用方式 GB/T 7714	施雨含. 中国-喜马拉雅三种黄耆植物与传粉熊蜂的空间分布预测, Predicting the spatial distribution of three Astragalus species and their pollinating bumblebees in Sino-Himalayas[D],2020.

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