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Tao Y, Wang Z, Ma C, He H, Xu J, Jin Y, Wang H, Zheng X. Soil Mesofauna Respond to the Upward Expansion of Deyeuxia purpurea in the Alpine Tundra of the Changbai Mountains, China. PLANTS 2019; 8:plants8120615. [PMID: 31861181 PMCID: PMC6963277 DOI: 10.3390/plants8120615] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 12/16/2019] [Accepted: 12/16/2019] [Indexed: 11/26/2022]
Abstract
Deyeuxia purpurea, a low-altitude species, has been expanding upwards into alpine tundra, and this upward expansion is causing serious ecological consequences. However, few studies have been performed regarding its effects on soil faunal communities. We examine how the upward expansion of D. purpurea affects the abundance, richness, and diversity of soil mesofauna, and evaluate how different taxa of soil mesofauna respond to the upward expansion of D. purpurea in the alpine tundra of Changbai Mountains, northeast China. A total of 128 soil mesofaunal samples were collected from four treatments, namely high upward expansion (HU), medium upward expansion (MU), low upward expansion (LU), and native plant habitats (NP). The results revealed that the abundance of soil mesofauna was increased with the rise of D. purpurea upward expansion, and the taxonomic composition varied with the different levels of D. purpurea upward expansion in the alpine tundra of the Changbai Mountains. No unique taxa were collected in the native plant habitats, and the upward expansion of D. purpurea promoted the colonization of predatory invertebrates. Isotomidae and Gamasida responded positively to the herbaceous plant upward expansion, and thus they were considered to be a positive indicator of upward expansion. Hypogastruridae and Enchytraeidae responded relatively negatively, while Oribatida, Actinedida, and Pseudachorutidae had ambivalent responses to the upward expansion. Overall, the abundance of soil mesofauna can indicate the levels of the upward expansion of D. purpurea. Soil mesofaunal guild characteristics were altered by the upward expansion. The different taxa of soil mesofauna responded to herbaceous plants’ upward expansion to various degrees. Therefore, this study provide evidence supporting the fact that the abundance of soil mesofauna can indicate the levels of upward expansion of D. purpurea, but the responses of soil mesofauna to the upward expansion of D. purpurea differ among their taxa.
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Affiliation(s)
- Yan Tao
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
| | - Zhongqiang Wang
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
| | - Chen Ma
- School of Public Administration and Law, Northeast Agricultural University, Harbin 150030, Heilongjiang Province, China
- Correspondence: ; Tel.: +86-185-0431-4175
| | - Hongshi He
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
- School of Natural Resources, University of Missouri, Columbia, MO 65211, USA
| | - Jiawei Xu
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
| | - Yinghua Jin
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
| | - Haixia Wang
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
| | - Xiaoxue Zheng
- Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun 130024, Jilin Province, China; (Y.T.); (Z.W.); (H.H.); (J.X.); (Y.J.); (H.W.); (X.Z.)
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Thomson JD, Fung HF, Ogilvie JE. Effects of spatial patterning of co-flowering plant species on pollination quantity and purity. ANNALS OF BOTANY 2019; 123:303-310. [PMID: 29947735 PMCID: PMC6344345 DOI: 10.1093/aob/mcy120] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 06/10/2018] [Indexed: 05/22/2023]
Abstract
BACKGROUND AND AIMS If two plant species share pollinators, it has been proposed that the interaction between them may range from competitive to facilitative, depending on the way in which they intermingle. In particular, the presence of a rewarding plant species may increase the rate of pollinator visitation to a less rewarding species in its vicinity, but the beneficial increase in visitation may be counteracted by a detrimental increase in heterospecific pollen transfer. We assessed this trade-off using bumble-bees foraging over a gradual spatial transition between two plant species in an indoor cage experiment. METHODS We used two 'species' of artificial flowers - one more rewarding than the other - in arrays that varied in the degree of species intermingling. The flowers dispensed and received powdered food dyes serving as pollen analogues. Captive bumble-bees visited to collect sucrose solution. We quantified dye delivery to the adhesive-tape 'stigmas' in flowers by spectrophotometry. KEY RESULTS Across the spatial transition between species, the less attractive species received more dye (more bee visits) when in proximity to the more attractive species than it did when alone, but the larger dye loads were less pure (more heterospecific pollen transfer). The decline in purity cancelled out the gain in acquisition, so conspecific pollen receipt by the less attractive species was neutrally affected. The more attractive species received fewer visits when surrounded by the less attractive species, so the interaction between the two species was amensalism when considering conspecific pollen reception. CONCLUSIONS Pollinator-mediated interactions between plant species depend on pollination quantity and purity, both of which can depend on spatial intermingling.
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Affiliation(s)
- James D Thomson
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
- Rocky Mountain Biological Laboratory, Crested Butte, CO, USA
- For correspondence. E-mail:
| | - Hannah F Fung
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
| | - Jane E Ogilvie
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada
- Rocky Mountain Biological Laboratory, Crested Butte, CO, USA
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