Plant Diversity ›› 2025, Vol. 47 ›› Issue (05): 814-823.DOI: 10.1016/j.pld.2025.05.002
• Articles • Previous Articles Next Articles
Yu Xiao (肖俞)a,b,c, Xuecan Wu (吴学灿)c, Hexiang Duan (段禾祥)c, Zhengtao Ren (任正涛)c, Zhicheng Jiang (姜志诚)c, Tingfa Dong (董廷发)a,b, Yuran Li (李宇然)c, Jinming Hu (胡金明)a,d, Yupeng Geng (耿宇鹏)a,b
Received:
2024-11-28
Revised:
2025-05-09
Online:
2025-09-29
Published:
2025-09-29
Contact:
Jinming Hu,E-mail:hujm@ynnu.edu.cn;Yupeng Geng,E-mail:ypgeng@ynu.edu.cn
Supported by:
Yu Xiao (肖俞)a,b,c, Xuecan Wu (吴学灿)c, Hexiang Duan (段禾祥)c, Zhengtao Ren (任正涛)c, Zhicheng Jiang (姜志诚)c, Tingfa Dong (董廷发)a,b, Yuran Li (李宇然)c, Jinming Hu (胡金明)a,d, Yupeng Geng (耿宇鹏)a,b
通讯作者:
Jinming Hu,E-mail:hujm@ynnu.edu.cn;Yupeng Geng,E-mail:ypgeng@ynu.edu.cn
基金资助:
Yu Xiao (肖俞), Xuecan Wu (吴学灿), Hexiang Duan (段禾祥), Zhengtao Ren (任正涛), Zhicheng Jiang (姜志诚), Tingfa Dong (董廷发), Yuran Li (李宇然), Jinming Hu (胡金明), Yupeng Geng (耿宇鹏). Environmental drivers and future distribution of invasive alien plant species in the Gaoligong Mountains, southwestern China[J]. Plant Diversity, 2025, 47(05): 814-823.
Yu Xiao (肖俞), Xuecan Wu (吴学灿), Hexiang Duan (段禾祥), Zhengtao Ren (任正涛), Zhicheng Jiang (姜志诚), Tingfa Dong (董廷发), Yuran Li (李宇然), Jinming Hu (胡金明), Yupeng Geng (耿宇鹏). Environmental drivers and future distribution of invasive alien plant species in the Gaoligong Mountains, southwestern China[J]. Plant Diversity, 2025, 47(05): 814-823.
Alexander, J.M., Kueffer, C., Daehler, C.C., et al., 2011. Assembly of nonnative floras along elevational gradients explained by directional ecological filtering. Proc. Natl. Acad. Sci. U.S.A. 108, 656-661. Ampoorter, E., Baeten, L., Vanhellemont, M., et al., 2015. Disentangling tree species identity and richness effects on the herb layer: First results from a German tree diversity experiment. J. Veg. Sci. 26, 742-755. Beaury, E.M., Finn, J.T., Corbin, J.D., et al., 2020. Biotic resistance to invasion is ubiquitous across ecosystems of the United States. Ecol. Lett. 23, 476-482. Blackburn, T.M., Bellard, C., Ricciardi, A., 2019. Alien versus native species as drivers of recent extinctions. Front. Ecol. Environ. 17, 203-207. Breiner, F.T., Nobis, M.P., Bergamini, A., et al., 2018. Optimizing ensembles of small models for predicting the distribution of species with few occurrences. Methods Ecol. Evol. 9, 802-808. Chen, P.D., Shen, C.C, Tao, Z.B, et al., 2024. Deterministic responses of biodiversity to climate change through exotic species invasions. Nat. Plants 10, 1464-1472. Chen, X.L., Ning, D.D., Qian, X., et al., 2022. Factors affecting the geographical distribution of invasive species in China. J. Integr. Agric. 21, 1116-1125. Chu, C.J., Lutz, J.A., Kral, K., et al., 2019. Direct and indirect effects of climate on richness drive the latitudinal diversity gradient in forest trees. Ecol. Lett. 22, 245-255. Cui, X., Liu, Q.R, Wu, C.R., et al., 2022. The alien invasive plants in Beijing-Tianjin-Hebei. Biodiv. Sci. 30, 21497. Carboni, M., Gueguen, M., Barros, C., et al., 2018. Simulating plant invasion dynamics in mountain ecosystems under global change scenarios. Glob. Change Biol. 24, E289-E302. Cuthbert, R.N., Diagne, C., Hudgins, E.J., et al., 2022. Biological invasion costs reveal insufficient proactive management worldwide. Sci. Total. Environ. 819, 153404. Davis, M.A., Grime, J.P., Thompson, K., 2000. Fluctuating resources in plant communities: a general theory of invasibility. J. Ecol. 88, 528-534. Dawson, W., Moser, D., Van Kleunen, M., et al., 2017. Global hotspots and correlates of alien species richness across taxonomic groups. Nat. Ecol. Evol. 1, 0186. DeFerrari, C.M., Naiman, R.J., 1994. A multi-scale assessment of the occurrence of exotic plants on the Olympic Peninsula, Washington. J. Veg. Sci. 5, 247-258. Deng, H.N, Ju, W., Gao, Y., et al., 2020. The species composition and distributional characteristics of invasive alien plants along the new Sichuan-Tibet Railway (Yaan to Changdu section). Biodiv. Sci. 28, 1174-1181. Diagne, C., Leroy, B., Vaissiere, A.C., et al., 2021. High and rising economic costs of biological invasions worldwide. Nature. 592, 571-+. Dullinger, I., Wessely, J., Bossdorf, O., et al., 2017. Climate change will increase the naturalization risk from garden plants in Europe. Glob. Ecol. Biogeogr. 26, 43-53. Essl, F., Dawson, W., Kreft, H., et al., 2019. Drivers of the relative richness of naturalized and invasive plant species on Earth. AoB Plants 11, plz051. Evans, A.E., Jarnevich, C.S., Beaury, E.M., et al., 2024. Shifting hotspots: Climate change projected to drive contractions and expansions of invasive plant abundance habitats. Divers. Distrib. 30, 41-54. Fang, W.J., Cai, Q., Zhao, Q., et al., 2022. Species richness patterns and the determinants of larch forests in China. Plant Divers. 44, 436-444. Fourcade, Y., Besnard, A.G., Secondi, J., 2018. Paintings predict the distribution of species, or the challenge of selecting environmental predictors and evaluation statistics. Glob. Ecol. Biogeogr. 27, 245-256. Gallardo, B., Aldridge, D.C., Gonzalez-Moreno, P., et al., 2017. Protected areas offer refuge from invasive species spreading under climate change. Glob. Change Biol. 23, 5331-5343. Guisan, A., Thuiller, W., Zimmermann, N.E., 2017. Habitat suitability and distribution models: with applications in R. Cambridge University Press, Cambridge. Haider, S., Kueffer, C., Bruelheide, H., et al., 2018. Mountain roads and non-native species modify elevational patterns of plant diversity. Glob. Ecol. Biogeogr. 27, 667-678. Haider, S., Palm, S., Bruelheide, H., et al., 2022. Disturbance and indirect effects of climate warming support a plant invader in mountains. Oikos 2022, e08783. Hao, Q., Ma, J.S., 2023. Invasive alien plants in China: An update. Plant Divers. 45, 117-121. Hoque, F., Hu, B., Wang, J.G., et al., 2020. Use of geospatial methods to characterize dispersion of the Emerald ash borer in southern Ontario, Canada. Ecol. Inform. 55, 101037. Hu, D.M., Ye, H., Qiu, Y.X., et al., 2020. Invasive risk assessment of alien plants along Wolong subalpine highway. J. Sichuan Univ. (Nat. Sci. Edit.). 57, 1002-1008. Hulme, P. E., 2017. Climate change and biological invasions: evidence, expectations, and response options. Biol. Rev. Camb. Philos. Soc. 92, 1297-1313. Ibanez, T., Hart, P., Ainsworth, A., et al., 2019. Factors associated with alien plant richness, cover and composition differ in tropical island forests. Divers. Distrib. 25, 1910-1923. IPBES, 2023. Global assessment report on biodiversity and ecosystem services of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services. IPBES Secretariat, Bonn, Germany. Jayakumar, R., Nair, K.K.N., 2022. Invasion and distribution of exotic plants in the tropical forests of Western Ghats, India. Trop. Ecol. 63, 522-530. Jiang, G., Zeng, R. 2006. Harm and control of alien invasive plants. Anhui Agricultural Sci. 2, 273-274. Kumar Rai, P., Singh, J.S., 2020. Invasive alien plant species: Their impact on environment, ecosystem services and human health. Ecol. Indic. 111, 106020. Lai, J.S., Zhu, W.J., Cui, D.F., et al., 2023. Extension of the glmm. hp package to zero-inflated generalized linear mixed models and multiple regression. J. Plant Ecol. 16, rtad038. Lai, J.S., Zou, Y., Zhang, J.L., et al., 2022. Generalizing hierarchical and variation partitioning in multiple regression and canonical analyses using the rdacca. hp R package. Methods Ecol. Evol. 13, 782-788. Lamsal, P., Kumar, L., Aryal, A., et al., 2018. Invasive alien plant species dynamics in the Himalayan region under climate change. Ambio. 47, 697-710. Lembrechts, J.J., Pauchard, A., Lenoir, J., et al., 2016. Disturbance is the key to plant invasions in cold environments. Proc. Natl. Acad. Sci. U.S.A. 113, 14061-14066. Li, H., Li, R., Ma, W., et al., 2021. Plant resources and geography of the Gaoligong Mountains in Southeast Tibet. Hubei Science and Technology Press, Wuhan (Chinese). Lin, Q.W., Xiao, C., Ma, J.S., 2022a. A dataset on catalogue of alien plants in China. Biodiv. Sci., 30, 22127. Lin, R.Z, Xu, C.L., Ye, J.F., et al., 2022b. Assessment of invasive seed plants in Gaoligongshan National Nature Reserve, Yunnan Province, China. Terrestr. Ecosyst. Conserv. 2, 37-46. Lin, Z.Y., Xiao, Y., Rao, E.M., et al., 2020. Relationships among different types of ecosystem service in Southwest China. Chin. J. Appl. Ecol. 31, 978-986. Li, Y., Guan, Y. 2015. Invasive plants in the main farmlands of Jiangsu. Southeast University Press, Nanjing (Chinese). Liu, Y., 2008. Temporal-spatial variation in climatic variables and ecological implications in the longitudinal range-gorge region Southwest China. PhD dissertation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Xishuangbanna, Yunnan, China. Lozano, V., Di Febbraro, M., Brundu, G., et al., 2023. Plant invasion risk inside and outside protected areas: Propagule pressure, abiotic and biotic factors definitively matter. Sci. Total Environ. 877, 162993. Ma, J.S, Li, H.R, 2018. The checklist of the alien invasive plant in China. Higher Education Press, Beijing (chinese). Ma, Q.Q., 2020. Potential geographical distribution of Ambrosia artemisiifolia L. and Ambrosia trifida L. Master thesis, Shihezi University, Xinjiang. McFadden, I.R., Sandel, B., Tsirogiannis, C., et al., 2019. Temperature shapes opposing latitudinal gradients of plant taxonomic and phylogenetic β diversity. Ecol. Lett. 22, 1126-1135. Medvecka, J., Zaliberova, M., Majekova, J., et al., 2018. Role of infrastructure and other environmental factors affecting the distribution of alien plants in the Tatra Mts. Folia Geobot. 53, 349-364. Mi, C.R., Ma, L., Yang, M.Y., et al., 2023. Global protected areas as refuges for amphibians and reptiles under climate change. Nat. Commun. 14, 1389. Nelson, T.A., Boots, B., 2008. Detecting spatial hot spots in landscape ecology. Ecography 31, 556-566. Park, J.S., Lee, H., Choi, D., et al., 2021. Spatially varying relationships between alien plant distributions and environmental factors in South Korea. Plants 10, 1377. Peng, S.J., Zhang, J., Zhang, X.L., et al., 2022. Conservation of woody species in China under future climate and land-cover changes. J. Appl. Ecol. 59, 141-152. Pysek, P., Pergl, J., Essl, F., et al., 2017. Naturalized alien flora of the world: species diversity, taxonomic and phylogenetic patterns, geographic distribution and global hotspots of plant invasion. Preslia. 89, 203-274. Qin, F., Xue, T.T., Liang, Y.F., et al., 2023. Present status, future trends, and control strategies of invasive alien plants in China affected by human activities and climate change. Ecography. 2024, e06919. Renteria, J.L., Darin, G.M.S., Grosholz, E.D., 2021. Assessing the risk of plant species invasion under different climate change scenarios in California. Invas. Plant Sci. Manage. 14, 172-182. Richardson, D.M., Pyek, P., Marcel Rejmanek, et al., 2000. Naturalization and invasion of alien plants: concepts and definitions. Divers. Distrib. 6, 93-107. Rossi, F., Becker, G., 2019. Creating forest management units with Hot Spot Analysis (Getis-Ord Gi*) over a forest affected by mixed-severity fires. Aust. For. 82, 166-175. Seebens, H., Bacher, S., Blackburn, T.M., et al., 2021. Projecting the continental accumulation of alien species through to 2050. Glob. Chang. Biol. 27, 970-982. Shaker, R.R., Yakubov, A.D., Nick, S.M., et al., 2017. Predicting aquatic invasion in Adirondack lakes: a spatial analysis of lake and landscape characteristics. Ecosphere. 8, e01723. Shi, Z., Zhou, Y., 2020. Theory and practice of spatial analysis. Science Press, Beijing (China). Shrestha, U.B., Sharma, K.P., Devkota, A., et al., 2018. Potential impact of climate change on the distribution of six invasive alien plants in Nepal. Ecol. Indic. 95, 99-107. Shrestha, U.B., Shrestha, B.B., 2019. Climate change amplifies plant invasion hotspots in Nepal. Divers. Distrib. 25, 1599-1612. Simberloff, D., 2010. Invasion biology (review). Ecol. Restorat. 28, 101-103. Song, H., Ordonez, A., Svenning, J.C., et al., 2021. Regional disparity in extinction risk: Comparison of disjunct plant genera between eastern Asia and eastern North America. Glob. Chang. Biol. 27, 1904-1914. Stohlgren, T.J., Binkley, D., Chong, G.W., et al., 1999. Exotic plant species invade hot spots of native plant diversity. Ecol. Monogr. 69, 25-46. Sun, Z.H., Peng, S.J., Ou, X.K., 2007. Rapid assessment and explanation of tree species abundance along the elevation gradient in Gaoligong Mountains, Yunnan, China. Chin. Sci. Bull. 52, 225-231. Taheri, S., Naimi, B., Rahbek, C., et al., 2021. Improvements in reports of species redistribution under climate change are required. Sci. Adv. 7, eabe1110. Wallingford, P.D., Morelli, T.L., Allen, J.M., et al., 2020. Adjusting the lens of invasion biology to focus on the impacts of climate-driven range shifts. Nat. Clim. Chang. 10, 398-405. Walther, G.R., Roques, A., Hulme, P.E., et al., 2009. Alien species in a warmer world: Risks and opportunities. Trends Ecol. Evol. 24, 686-693. Wang, A., Melton, A.E., Soltis, D.E., et al., 2022. Potential distributional shifts in North America of allelopathic invasive plant species under climate change models. Plant Divers. 44, 11-19. Wang, C.Y., Cheng, H.Y., Wang, S., et al., 2021a. Plant community and the influence of plant taxonomic diversity on community stability and invasibility: A case study based on Solidago canadensis L. Sci. Total Environ. 768, 144518. Wang, Z.H., Chen, A.P., Piao, S.L., et al., 2004. Pattern of species richness along an altitudinal gradient on Gaoligong Mountains, Southwest China. Biodiv. Sci. 12, 82-88. Wang, Y., Li, H.X., Wang, H.J., et al., 2021b. Evaluation of CMIP6 model simulations of extreme precipitation in China and comparison with CMIP5. Acta Meteorologica Sinica. 79, 369-386. Wu, Z.Y., Zhu, Y.C., Jiang, H.Q., 1987. Vegetation of Yunnan. Science Press, Beijing (Chinese). Xiao, Y., Li, Y.R, Duan, H.X, et al., 2023. Invasion status and control measures for alien plants within the Gaoligong Mountains. Biodiv. Sci. 31, 23011. Xiao, Z.Q., Liang, S.L., Wang, L.D., et al., 2014. Use of General Regression Neural. Networks for Generating the GLASS Leaf Area Index Product from Time Series MODIS Surface Reflectance. IEEE Trans. Geosci. Remote Sensing. 52, 209-223. Xiao, Z.Q., Liang, S.L., Wang, J.D., et al., 2016. Long Time-Series Global Land Surface. Satellite (GLASS) Leaf Area Index Product Derived from MODIS and AVHRR Data. IEEE Trans. Geosci. Remote Sensing. 54, 5301-5318. Xing, D.H., 2019a. Projecting the distribution of the suitable area of conyza sumatrensis in China and its spatial shift under changing climate. Master thesis, Yunnan University, Kunming. Xing, W.W., 2019b. Numerical simulation of local circulation of complex toporaphy on the Gaoligong Mountains. Master thesis, Yunnan University, Kunming. Yang, M.Y., Lu, Z., Fan, Z.Y., et al., 2018. Distribution of non-native plant species along elevation gradients in a protected area in the eastern Himalayas, China. Alp. Bot. 128, 169-178. Yan, J., Yan, X.L., Wang, Z.H., et al., 2017. Distribution pattern and rating of alien invasive plants in Anhui Province. Plant Sci. J. 35, 679-690. Yang, B., Cui, M.M., Du, Y.Z., et al., 2022a. Influence of multiple global change drivers on plant invasion: Additive effects are uncommon. Front. Plant Sci. 13, 1020621. Yang, M.X., Xiao, T.G., Li, Y., et al., 2022b. Evaluation and Projection of Climate Change in Southwest China Us-ing CMIP6 Models. Plateau Meteorology 41, 1557-1571. Yang, Q., Jin, B.C., Zhao, X.C., et al., 2022c. Composition, distribution, and factors affecting invasive plants in grasslands of Guizhou Province of Southwest China. Diversity 14, 167. Yang, Y.B., Bian, Z.H., Ren, W.J., et al., 2023. Spatial patterns and hotspots of plant invasion in China. Glob. Ecol. Conserv. 43, e02424. Zhao, C.Y., Jian, Z.X., Yan, L.X., et al., 2019. Relationships between invasive alien grasses and native plants across different national nature reserves, Yunnan Province. J. Plant Protect. 46, 122-129. Zhang, F.X., Wang, C.J., Wan, J.Z., 2022. Using consensus land cover data to model global invasive tree species distributions. Plants 11, 981. Zenni, R.D., Essl, F., Garcia-Berthou, E., et al., 2021. The economic costs of biological invasions around the world. Neobiota 67, 1-9. Zhou, Y., 2020c. Influences of vegetation types and habitat heterogeneity on community invasibility in the Pearl River Delta. PhD dissertation, South China Agricultural University, Guangzhou. Zhou, J., Li, R., Jiang, X., et al., 2023. Comprehensive scientific research on Gaoligong Mountain in Yunnan. Science Press, Beijing (Chinese). Zhou, Q.L., Wang, L.X., Jiang, Z.Y., et al., 2020a. Effects of climatic and social factors on dispersal strategies of alien species across China. Sci. Total Environ. 749, 141443. Zhou, Q.L., Wang, Y.C., Li, X.H., et al., 2020b. Geographical distribution and determining factors of different invasive ranks of alien species across China. Sci. Total Environ. 722, 137929. Zheng, M.M., Pysek, P., Guo, K., et al., 2024. Clonal alien plants in the mountains spread upward more extensively and faster than non-clonal. Neobiota 91, 29-48. Zuur, A.F., Ieno, E.N., Walker, N.J., et al., 2009. Mixed effect models and extensions in ecology with R. Springer, New York. |
[1] | Hong Qian, Shenhua Qian. Global patterns of taxonomic and phylogenetic endemism in liverwort assemblages [J]. Plant Diversity, 2025, 47(01): 82-88. |
[2] | Hai-Yao Chen, Zhi-Rong Zhang, Xin Yao, Ji-Dong Ya, Xiao-Hua Jin, Lin Wang, Lu Lu, De-Zhu Li, Jun-Bo Yang, Wen-Bin Yu. Plastid phylogenomics provides new insights into the systematics, diversification, and biogeography of Cymbidium (Orchidaceae) [J]. Plant Diversity, 2024, 46(04): 448-461. |
[3] | Wanwalee Kongjarat, Lu Han, Amy Ny Aina Aritsara, Shu-Bin Zhang, Gao-Juan Zhao, Yong-Jiang Zhang, Phisamai Maenpuen, Ying-Mei Li, Yi-Ke Zou, Ming-Yi Li, Xue-Nan Li, Lian-Bin Tao, Ya-Jun Chen. Hydraulic properties and drought response of a tropical bamboo (Cephalostachyum pergracile) [J]. Plant Diversity, 2024, 46(03): 406-415. |
[4] | Hong Qian, Brent D. Mishler, Jian Zhang, Shenhua Qian. Global patterns and ecological drivers of taxonomic and phylogenetic endemism in angiosperm genera [J]. Plant Diversity, 2024, 46(02): 149-157. |
[5] | Vincent Okelo Wanga, Boniface K. Ngarega, Millicent Akinyi Oulo, Elijah Mbandi Mkala, Veronicah Mutele Ngumbau, Guy Eric Onjalalaina, Wyclif Ochieng Odago, Consolata Nanjala, Clintone Onyango Ochieng, Moses Kirega Gichua, Robert Wahiti Gituru, Guang-Wan Hu. Projected impacts of climate change on the habitat of Xerophyta species in Africa [J]. Plant Diversity, 2024, 46(01): 91-100. |
[6] | Lin Lin, Xiao-Long Jiang, Kai-Qi Guo, Amy Byrne, Min Deng. Climate change impacts the distribution of Quercus section Cyclobalanopsis (Fagaceae), a keystone lineage in East Asian evergreen broadleaved forests [J]. Plant Diversity, 2023, 45(05): 552-568. |
[7] | Gang Feng, Ying-Jie Xiong, Hua-Yu Wei, Yao Li, Ling-Feng Mao. Endemic medicinal plant distribution correlated with stable climate, precipitation, and cultural diversity [J]. Plant Diversity, 2023, 45(04): 479-484. |
[8] | Qin Liu, Tian-Tian Xue, Xiao-Xia Zhang, Xu-Dong Yang, Fei Qin, Wen-Di Zhang, Lei Wu, Rainer W. Bussmann, Sheng-Xiang Yu. Distribution and conservation of near threatened plants in China [J]. Plant Diversity, 2023, 45(03): 272-283. |
[9] | Boniface K. Ngarega, John M. Nzei, Josphat K. Saina, Marwa Waseem A. Halmy, Jin-Ming Chen, Zhi-Zhong Li. Mapping the habitat suitability of Ottelia species in Africa [J]. Plant Diversity, 2022, 44(05): 468-480. |
[10] | Zhang-Jian Shan, Jian-Fei Ye, Da-Cheng Hao, Pei-Gen Xiao, Zhi-Duan Chen, An-Ming Lu. Distribution patterns and industry planning of commonly used traditional Chinese medicinal plants in China [J]. Plant Diversity, 2022, 44(03): 255-261. |
[11] | Atefeh Ghorbanalizadeh, Hossein Akhani. Plant diversity of Hyrcanian relict forests: An annotated checklist, chorology and threat categories of endemic and near endemic vascular plant species [J]. Plant Diversity, 2022, 44(01): 39-69. |
[12] | Jun-Nan Wan, Ndungu J. Mbari, Sheng-Wei Wang, Bing Liu, Brian N. Mwangi, Jean R. E. Rasoarahona, Hai-Ping Xin, Ya-Dong Zhou, Qing-Feng Wang. Modeling impacts of climate change on the potential distribution of six endemic baobab species in Madagascar [J]. Plant Diversity, 2021, 43(02): 117-124. |
[13] | Richard T. Corlett. Safeguarding our future by protecting biodiversity [J]. Plant Diversity, 2020, 42(04): 221-228. |
[14] | Santosh Kumar Rana, Hum Kala Rana, Krishna Kumar Shrestha, Suresh Sujakhu, Sailesh Ranjitkar. Determining bioclimatic space of Himalayan alder for agroforestry systems in Nepal [J]. Plant Diversity, 2018, 40(01): 1-18. |
[15] | Timothy J. Entwisle, Chris Cole, Peter Symes. Adapting the botanical landscape of Melbourne Gardens (Royal Botanic Gardens Victoria) in response to climate change [J]. Plant Diversity, 2017, 39(06): 338-347. |
Viewed | ||||||
Full text |
|
|||||
Abstract |
|
|||||