Biodiversity Science ›› 2019, Vol. 27 ›› Issue (3): 306-313.doi: 10.17520/biods.2018269

• Original Papers • Previous Article     Next Article

Status of invasive plants on local pollination networks: A case study of Tagetes minuta in Tibet based on pollen grains from pollinators

Tu Yanli1, Wang Liping2, 3, Wang Xilong1, Wang Linlin2, 3, *(), Duan Yuanwen2   

  1. 1 Tibet Plateau Institute of Biology, Lhasa 850001
    2 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201
    3 University of Chinese Academy of Sciences, Beijing 100049
  • Received:2018-10-11 Accepted:2019-03-02 Online:2019-03-20
  • Wang Linlin E-mail:wanglinlin0328@mail.kib.ac.cn

Invasive plants that use local pollinators would better ensure their expansion in the new environment, but the role and status of the invasive plants on local pollination network is still unclear. In this paper, we analyzed the pollen grains of Tagetes minuta carried by pollinators and constructed a plant-pollinator network, to explore the roles and impacts of T. minuta in local pollination network. The results showed that pollination system of T. minuta was generalized, and there were 13 insect species visiting its flowers, 12 of which carried pollen grains of T. minuta, and the pollen grains of T. minuta accounted for 89.89%. Among the 12 pollinator species of T. minuta, one species of bees, two species of scorpion flies and one species of flies are the main pollinators. This study reveals that T. minuta has successfully used a variety of local pollinators for pollination in a relatively short period of time, indicating that T. minuta has strong adaptability and diffusion ability, and it is necessary to pay more attentions to the prevention and control of T. minuta in the future.

Key words: Qinghai-Tibet Plateau, Tagetes minuta, invasive plants, pollination network, pollen

Fig. 1

Population of Tagetes minuta in Tibet and its pollinators. (A) T. minuta population; (B) Colletidae sp.; (C) Anthomyiidae sp.; (D) Calliphoridae sp.; (E) Lycaena phlaeas; (F) Tenebrionidae sp."

Table 1

Community level parameters of pollination network of Tagetes minuta population"

特征 Traits 网络参数 Parameters
植物种类数 No. of plant species 12
访花昆虫种类数 No. of visiting species 13
植物与昆虫的连接数量 No. of interactions 63
连接度 Connectance 0.404
嵌套度 Nestedness temperature 14.57
加权嵌套度 Weighted nestedness 0.683
特化水平 Specialization level (H°2) 0.147

Table 2

Several parameters of plants at the species levels in the pollination network of Tagetes minuta population"

代码
Codes
植物
Plant species
传粉者种类
Degree
传粉昆虫比例
Normalised degree
物种强度
Species strength
特化水平
Specialization level ()
A 印加孔雀草 Tagetes minuta 12 0.923 10.312 0.034
B 狭叶荆芥 Nepeta souliei 8 0.615 0.85 0.095
C 无心菜 Arenaria serphyllifolia 5 0.385 0.086 0.11
D 马先蒿属一种 Pedicularis sp. 6 0.462 0.054 0.085
E 龙胆属一种 Gentiana sp. 4 0.308 0.779 0.467
F 紫草科一种 Boraginaceae sp. 6 0.462 0.107 0.046
G 蓝钟花属一种 Cyananthus sp. 5 0.385 0.328 0.289
H 唇形科一种 Lamiaceae sp. 4 0.308 0.197 0.099
I 唇形科一种 Lamiaceae sp. 1 0.077 0.002 0.045
J 唇形科一种 Lamiaceae sp. 3 0.231 0.037 0.332
K 百合科一种 Liliaceae sp. 3 0.231 0.352 0.563
L 甘青老鹳草 Geranium pylzowianum 6 0.462 0.063 0.117

Fig. 2

A scan of pollens carried by pollinators of Tagetes minuta. (A) Tagetes minuta; (B) Nepeta souliei; (C) Arenaria serphyllifolia; (D) Pedicularis sp.; (E) Gentiana sp.; (F) Boraginaceae sp.; (G) Cyananthus sp.; (H-J) Lamiaceae spp.; (K) Liliaceae sp.; (L) Geranium pylzowianum."

Fig. 3

Pollen network carried by pollinators of Tagetes minuta. Upper bars represent insect species and lower bars represent plant species. Bar width is proportional to the frequency of interactions. Lines are relative to the interaction between plants and insects. The codes of species are shown in Table 2 and Table 3."

Table 3

Several parameters of pollinators at the species level in the pollination network of the Tagetes minuta population"

代码
Codes
传粉者
Pollinators
昆虫数量
Samples
植物物种
Degree
植物物种比例
Normalised degree
物种强度
Species strength
特化水平
Bee sp. 分舌花蜂科Colletidae 32 11 0.917 1.611 0.006
Syr sp.1 长尾管蚜蝇Eristalis tenax 5 10 0.833 2.194 0.102
Syr sp.2 黑带蚜蝇属Episyrpus 3 7 0.583 0.64 0.024
Syr sp.3 黑带蚜蝇属Episyrpus 3 7 0.583 1.319 0.012
Syr sp.4 食蚜蝇科Syrphidae 1 2 0.167 0.013 0
Fly sp.1 丽蝇科Calliphoridae 2 8 0.667 4.072 0.016
Fly sp.2 丽蝇科Calliphoridae 1 2 0.167 0.299 0.139
Fly sp.3 蝇科Muscidae 1 1 0.083 0.014 0.017
Fly sp.4 花蝇科Anthomyiidae 1 4 0.333 0.303 0.034
Sar sp. 麻蝇科Sarcophadidae 2 4 0.333 0.823 0.056
Pier sp.1 东方菜粉蝶Pieris canidia 1 2 0.167 0.501 0.803
Pier sp.2 红灰蝶Lycaena phlaeas 2 1 0.083 0.003 0.005
Col sp. 拟步甲科Tenebrionidae 1 4 0.333 0.229 0.119
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