Tradescantia

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Peter A Williams - One of the best experts on this subject based on the ideXlab platform.

  • the impact of an invasive weed Tradescantia fluminensis on native forest regeneration
    Journal of Applied Ecology, 2001
    Co-Authors: Rachel J Standish, Peter A Williams, Alastair W Robertson
    Abstract:

    Summary 1 Tradescantiafluminensis is an invasive weed of New Zealand, eastern Australia and Florida, where it carpets the ground in canopy-depleted native forest remnants and prevents regeneration. The aim of our study was to determine the Tradescantia biomass levels at which this occurs. 2 At two podocarp/broad-leaved forest remnants in New Zealand, we showed that Tradescantia biomass increased logistically with available light, to a maximum at 10–15% full light. The maximum Tradescantia biomass was greater at the wetter site (819 g m−2) than at the comparatively dry site (695 g m−2). 3 Native forest seedling species richness and abundance decreased exponentially with increasing Tradescantia biomass, for example from 3·4 and 81·5 m−2, respectively, in the absence of the weed, to 0·37 and 6·28 m−2 at maximum Tradescantia biomass. We attributed this to decreasing light levels beneath Tradescantia. Under approximately 500 g m−2 of Tradescantia (c. 100% weed cover), available light was reduced to < 1% full light. 4 The compositions of the extant vegetation, seed rain and seed bank were consistent with our interpretation that light availability drives the differences in seedling species richness and abundance between Tradescantia and non-Tradescantia habitats. 5 We estimated the response of seedlings of six commonly occurring native woody species to Tradescantia biomass. Macropiper excelsum appeared to be the least tolerant, its LD50 (the biomass of Tradescantia at which its abundance is reduced to 50% of the maximum) being approximately 12 g m−2, whereas Dysoxylum spectabile was the most tolerant, with an LD50 of 40 g m−2. 6 Dysoxylum spectabile germination and early seedling establishment could occur in dense Tradescantia, but the probability of survival over 20 months decreased logistically with increasing Tradescantia biomass. The probability of survival at 100% weed cover was 6% compared with 84% for seedlings in non-Tradescantia habitat. We estimated that emergence above the weed occurs only where cover of Tradescantia is < 200 g m−2 (70–90% cover). 7 We predicted that increases in native species richness and abundance will accumulate with increasing suppression of the weed. Imposing shade by planting trees to improve the canopy cover is a potentially useful tool for restoration of Tradescantia-affected forest remnants.

  • impacts of the weed Tradescantia fluminensis on insect communities in fragmented forests in new zealand
    Biological Conservation, 2001
    Co-Authors: Richard Toft, R J Harris, Peter A Williams
    Abstract:

    Abstract The impact of the weed Tradescantia fluminensis on insect communities, as represented by Malaise-trapped beetles (Coleoptera) and fungus gnats (Diptera: Mycetophilidae s. l.), was studied in three forest fragments. Each fragment contained three plots with and without a dense weed cover. Data on vegetation and habitat variables were collected. Twinspan and Decorana analyses separated the plots by fragment for fungus gnat communities, and nearly so for the presence/absence of beetle species. The fungus gnat communities separated into plots with and without Tradescantia at two sites, and there were fewer species of fungus gnats and beetles in Tradescantia plots at the site with the simplest habitat structure. The richness of beetle and fungus gnat species was correlated with vascular plant richness. As Tradescantia is known to prevent regeneration of many native plants, we predict a corresponding decline in invertebrate diversity and fragment complementarity where the weed is established.

  • The impact of an invasive weed Tradescantia fluminensis on native forest regeneration
    Journal of Applied Ecology, 2001
    Co-Authors: Rachel J Standish, Alastair W Robertson, Peter A Williams
    Abstract:

    Summary 1 Tradescantiafluminensis is an invasive weed of New Zealand, eastern Australia and Florida, where it carpets the ground in canopy-depleted native forest remnants and prevents regeneration. The aim of our study was to determine the Tradescantia biomass levels at which this occurs. 2 At two podocarp/broad-leaved forest remnants in New Zealand, we showed that Tradescantia biomass increased logistically with available light, to a maximum at 10–15% full light. The maximum Tradescantia biomass was greater at the wetter site (819 g m−2) than at the comparatively dry site (695 g m−2). 3 Native forest seedling species richness and abundance decreased exponentially with increasing Tradescantia biomass, for example from 3·4 and 81·5 m−2, respectively, in the absence of the weed, to 0·37 and 6·28 m−2 at maximum Tradescantia biomass. We attributed this to decreasing light levels beneath Tradescantia. Under approximately 500 g m−2 of Tradescantia (c. 100% weed cover), available light was reduced to

Shona L. Lamoureaux - One of the best experts on this subject based on the ideXlab platform.

  • Tradescantia management in a New Zealand National Park.
    Ecological Management & Restoration, 2012
    Co-Authors: Geoff A. Hurrell, Tom Belton, C. S. Lusk, Shona L. Lamoureaux
    Abstract:

    Summary The invasive plant species, Tradescantia fluminensis, first appeared in the Whakapohai Reserve in South Westland, New Zealand, during the 1960s, and by 2002, it had spread throughout the 43-ha riparian reserve. It was presumed at high risk of spreading to neighbouring National Parks because of its ability to spread by floodwaters. A restoration project with the aim of eradicating Tradescantia in the reserve began in May 2002, at which time eight transects were established. The cover of Tradescantia was measured before control, and after on six subsequent occasions. The initial cover of Tradescantia was estimated to be about 17% of the entire reserve in 2002 and declined with annual control to

  • Tradescantia management in a new zealand national park
    Ecological Management and Restoration, 2012
    Co-Authors: Geoff A. Hurrell, Tom Belton, C. S. Lusk, Shona L. Lamoureaux
    Abstract:

    Summary The invasive plant species, Tradescantia fluminensis, first appeared in the Whakapohai Reserve in South Westland, New Zealand, during the 1960s, and by 2002, it had spread throughout the 43-ha riparian reserve. It was presumed at high risk of spreading to neighbouring National Parks because of its ability to spread by floodwaters. A restoration project with the aim of eradicating Tradescantia in the reserve began in May 2002, at which time eight transects were established. The cover of Tradescantia was measured before control, and after on six subsequent occasions. The initial cover of Tradescantia was estimated to be about 17% of the entire reserve in 2002 and declined with annual control to <0.1% in 2011. The effects of this management regime on the forest community are described along with documentation of the costs and time put into achieving these outcomes.

  • Native plant and weed diversity in forest remnants affected by Tradescantia fluminensis management.
    New Zealand Plant Protection, 2012
    Co-Authors: C. S. Lusk, G. A. Hurrell, Shona L. Lamoureaux
    Abstract:

    This study aimed to determine the effects of different management practices for Tradescantia fluminensis in lowland podocarp/broadleaf forest remnants in the lower North Island. Fourteen 50 m line transects, across eight sites, were established in April 2009 and assessed annually until 2012. Management practices prior to and during the study period were documented. Over the four assessments, changes in the numbers of native plant seedlings and species differed greatly between management practices as did the percent cover of Tradescantia and other weeds. Native species diversity improved more and the abundance of Tradescantia and other weeds increased less, in forests that were less disturbed and where careful on-going control was carried out, than in forests with more disturbance prior to or during control operations. Effective monitoring of both weeds and native plants is essential to enable the outcome of weed management practices to be measured.

Amanda B. Cemper - One of the best experts on this subject based on the ideXlab platform.

Geoff A. Hurrell - One of the best experts on this subject based on the ideXlab platform.

  • Tradescantia management in a New Zealand National Park.
    Ecological Management & Restoration, 2012
    Co-Authors: Geoff A. Hurrell, Tom Belton, C. S. Lusk, Shona L. Lamoureaux
    Abstract:

    Summary The invasive plant species, Tradescantia fluminensis, first appeared in the Whakapohai Reserve in South Westland, New Zealand, during the 1960s, and by 2002, it had spread throughout the 43-ha riparian reserve. It was presumed at high risk of spreading to neighbouring National Parks because of its ability to spread by floodwaters. A restoration project with the aim of eradicating Tradescantia in the reserve began in May 2002, at which time eight transects were established. The cover of Tradescantia was measured before control, and after on six subsequent occasions. The initial cover of Tradescantia was estimated to be about 17% of the entire reserve in 2002 and declined with annual control to

  • Tradescantia management in a new zealand national park
    Ecological Management and Restoration, 2012
    Co-Authors: Geoff A. Hurrell, Tom Belton, C. S. Lusk, Shona L. Lamoureaux
    Abstract:

    Summary The invasive plant species, Tradescantia fluminensis, first appeared in the Whakapohai Reserve in South Westland, New Zealand, during the 1960s, and by 2002, it had spread throughout the 43-ha riparian reserve. It was presumed at high risk of spreading to neighbouring National Parks because of its ability to spread by floodwaters. A restoration project with the aim of eradicating Tradescantia in the reserve began in May 2002, at which time eight transects were established. The cover of Tradescantia was measured before control, and after on six subsequent occasions. The initial cover of Tradescantia was estimated to be about 17% of the entire reserve in 2002 and declined with annual control to <0.1% in 2011. The effects of this management regime on the forest community are described along with documentation of the costs and time put into achieving these outcomes.

James R. Manhart - One of the best experts on this subject based on the ideXlab platform.

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