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Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed / CALISTA COLLINS

Swansea University Author: CALISTA COLLINS

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Abstract

Reynoutria japonica (Japanese knotweed) is an invasive species that negatively impacts local biodiversity and ecosystems globally. Control methods are inefficient and laborious, and long-term restoration data is sparse. One of the characteristics that contributes to the invasiveness of a plant is al...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Master of Research
Degree name: MRes
Supervisor: Eastwood, Dan
URI: https://cronfa.swan.ac.uk/Record/cronfa60292
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first_indexed 2022-06-22T10:40:17Z
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spelling 2022-06-22T11:51:14.0001621 v2 60292 2022-06-22 Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed a7f4621db0f364e52ec83ba7890bb27c CALISTA COLLINS CALISTA COLLINS true false 2022-06-22 Reynoutria japonica (Japanese knotweed) is an invasive species that negatively impacts local biodiversity and ecosystems globally. Control methods are inefficient and laborious, and long-term restoration data is sparse. One of the characteristics that contributes to the invasiveness of a plant is allelopathy, which has been recorded in Solidago canadensis (Canadian goldenrod). Allelochemicals can reduce the fitness of native species, outlined by the native weapons hypothesis, and therefore may negatively impact other invasive species, such as R. japonica. To test this, a pot trial was set up, which firstly aimed to determine whether S. canadensis negatively affected the health of R. japonica aboveground growth. The two species were grown together with and without isolation treatments. The weekly growth rates and chlorophyll fluorescence were measured and compared to single species controls. Secondly, the pot trial aimed to assess the interactions between R. japonica, S. canadensis, and Impatiens glandulifera and growth rate and chlorophyll fluorescence were measured weekly. S. canadensis had higher mean chlorophyll fluorescence in its pairwise and tripartite treatments than the R. japonica and I. glandulifera (p =0.0016 and p < 0.0111, respectively). I. glandulifera had the highest mean growth rate in the tripartite treatment (p = 0.0001). S. canadensis had higher chlorophyll fluorescence than R. japonica when grown together or separately.To understand the long-term effects of using native plant functional traits in habitat restoration, I continued the data collection of Hocking, 2021, to measure the restorative success of various specific seed mixes sown on land previously dominated by R. japonica and treated with glyphosate. Plants was selected due to functional traits which aided land restoration and prevented secondary invasions. Community and seedbank analyses of plots with the tailored restorative seed mixes were carried out to assess the subsequent species diversity and richness. High and low functional diversity seed mixes provided the highest species diversity and richness within treatments. E-Thesis Swansea Invasive plants, Reynoutria japonica, Impatiens glandulifera, Solidago canadensis, Japanese knotweed, Himalayan balsam, Canadian balsam, secondary invasions, restoration data 17 6 2022 2022-06-17 COLLEGE NANME COLLEGE CODE Swansea University Eastwood, Dan Master of Research MRes 2022-06-22T11:51:14.0001621 2022-06-22T11:35:15.0112199 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences CALISTA COLLINS 1 60292__24352__9333c454ec8f4bee9df4f63e6c718ac5.pdf Collins_Calista_MRes_Thesis_Final_Redacted_Signature.pdf 2022-06-22T11:46:13.8999350 Output 3262155 application/pdf E-Thesis – open access true Copyright: The author, Calista Collins, 2022. true eng
title Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
spellingShingle Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
CALISTA COLLINS
title_short Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
title_full Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
title_fullStr Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
title_full_unstemmed Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
title_sort Observing the tripartite interaction between three invasive plant species, alongside the ecological restoration of biodiversity in habitats invaded by Japanese knotweed
author_id_str_mv a7f4621db0f364e52ec83ba7890bb27c
author_id_fullname_str_mv a7f4621db0f364e52ec83ba7890bb27c_***_CALISTA COLLINS
author CALISTA COLLINS
author2 CALISTA COLLINS
format E-Thesis
publishDate 2022
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 1
active_str 0
description Reynoutria japonica (Japanese knotweed) is an invasive species that negatively impacts local biodiversity and ecosystems globally. Control methods are inefficient and laborious, and long-term restoration data is sparse. One of the characteristics that contributes to the invasiveness of a plant is allelopathy, which has been recorded in Solidago canadensis (Canadian goldenrod). Allelochemicals can reduce the fitness of native species, outlined by the native weapons hypothesis, and therefore may negatively impact other invasive species, such as R. japonica. To test this, a pot trial was set up, which firstly aimed to determine whether S. canadensis negatively affected the health of R. japonica aboveground growth. The two species were grown together with and without isolation treatments. The weekly growth rates and chlorophyll fluorescence were measured and compared to single species controls. Secondly, the pot trial aimed to assess the interactions between R. japonica, S. canadensis, and Impatiens glandulifera and growth rate and chlorophyll fluorescence were measured weekly. S. canadensis had higher mean chlorophyll fluorescence in its pairwise and tripartite treatments than the R. japonica and I. glandulifera (p =0.0016 and p < 0.0111, respectively). I. glandulifera had the highest mean growth rate in the tripartite treatment (p = 0.0001). S. canadensis had higher chlorophyll fluorescence than R. japonica when grown together or separately.To understand the long-term effects of using native plant functional traits in habitat restoration, I continued the data collection of Hocking, 2021, to measure the restorative success of various specific seed mixes sown on land previously dominated by R. japonica and treated with glyphosate. Plants was selected due to functional traits which aided land restoration and prevented secondary invasions. Community and seedbank analyses of plots with the tailored restorative seed mixes were carried out to assess the subsequent species diversity and richness. High and low functional diversity seed mixes provided the highest species diversity and richness within treatments.
published_date 2022-06-17T04:18:17Z
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score 11.035786

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