An in vitro assessment of the potential antidiabetic activity and cytotoxic effects of ethanolic and aqueous extracts from three invasive Australian acacias DOI Creative Commons
Daniel Buttner, Shanika Reddy, Trevor Koekemoer

et al.

South African Journal of Botany, Journal Year: 2021, Volume and Issue: 141, P. 1 - 11

Published: May 12, 2021

Acacia cyclops, saligna and mearnsii are characterized as prolific invasive alien plants (IAPs) presenting a substantial ecological economic burden on South Africa. While conventionally these species perceived weeds having little value, this study attempts to demonstrate their respective potential phytomedicinal resource in the treatment of type 2 diabetes – thereby incentivizing eradication. Moreover, aimed assess antidiabetic cytotoxic effects extracts from three Australian acacias vitro. The α-glucosidase ɑ-amylase activities ethanolic aqueous derived aerial tissues A. saligna, were investigated, followed by cytotoxicity assessment using Hoechst 33342-Propidium Iodide (PI) dual staining quantitative fluorescence microscopy human colon (Caco-2) cell line. Of screened, bark demonstrated highest inhibitory activity against α-amylase with an IC50 10.45 ± 3.79 μg/ml 2.35 0.61 leaf extract depicting strong (IC50 3.64 1.59 μg/ml) moderate 17.67 3.84 inhibition. values all significantly (p < 0.05) lower than Acarbose 330.71 28.36 Epigallocatechin gallate 68.2 8.34 μg/ml). All found be nontoxic at test concentrations Caco-2 cells confirmed Hoescht 33342-PI staining. Overall, findings presented provide first concurrent account Acacias Africa reporting alternative therapeutic option for diabetes.

Language: Английский

Biological Invasions in South Africa: An Overview DOI Creative Commons
Brian W. van Wilgen, John Measey, David M. Richardson

et al.

Springer eBooks, Journal Year: 2020, Volume and Issue: unknown, P. 3 - 31

Published: Jan. 1, 2020

Language: Английский

Citations

82
A global perspective on the influence of the COVID-19 pandemic on freshwater fish biodiversity DOI Open Access
Steven J. Cooke, William M. Twardek, Abigail J. Lynch

et al.

Biological Conservation, Journal Year: 2020, Volume and Issue: 253, P. 108932 - 108932

Published: Dec. 19, 2020

Language: Английский

Citations

72
The Biogeography of South African Terrestrial Plant Invasions DOI Creative Commons
David M. Richardson, Llewellyn C. Foxcroft, Guillaume Latombe

et al.

Springer eBooks, Journal Year: 2020, Volume and Issue: unknown, P. 67 - 96

Published: Jan. 1, 2020

Language: Английский

Citations

69
Secondary invasion and weedy native species dominance after clearing invasive alien plants in South Africa: Status quo and prognosis DOI Creative Commons
Mlungele M. Nsikani, Sjirk Geerts, Sheunesu Ruwanza

et al.

South African Journal of Botany, Journal Year: 2020, Volume and Issue: 132, P. 338 - 345

Published: June 14, 2020

Clearing invasive alien plants often facilitates secondary invasion and/or weedy native species dominance instead of biodiversity recovery. Secondary in turn can present significant barriers to restoration by hindering the recovery key species. The problem and is ubiquitous well appreciated globally, but poorly understood context ecology South Africa. This study uses a two-pronged approach – literature review plus an expert workshop evaluate knowledge on after clearing Focus placed definition, habits, biomes, target invaders, factors leading to, effects management dominance. Results suggest that are observed invaders seldom reported, focused on, identified name correctly defined. occurrence not biome specific mediated such as soil physico-chemical legacies availability propagules seed bank surrounding areas, side technique used clear invaders. Ferns, grasses, herbs, sedges, shrubs, trees be Few or no interventions currently Given paucity Africa, there clearly need for more research. Practitioners should integrate with their overall plant efforts. Relevant steps taken include mechanisms incentives dealing policy

Language: Английский

Citations

33
The invasion threat of the emerging alien cactus Cylindropuntia pallida (Rosa), F.M. Knuth in South Africa and the potential for control using herbicides DOI Creative Commons
Thabiso Michael Mokotjomela, Takalani Nelufule, Zimbini Scott

et al.

Environmental Monitoring and Assessment, Journal Year: 2024, Volume and Issue: 196(7)

Published: June 28, 2024

The emerging alien cactus Cylindropuntia pallida (Rose) F.M. Knuth originates from northern Mexico and introduced into South Africa in 1940s as an ornamental plant. Multiple populations of C. have been detected various areas Africa. has effective propagule dispersal rapid recruitment making it a likely key future invader, thus, is target for eradication To eradicate populations, foliar spray (i.e. using 2% concentration herbicide with fluroxypyr triclopyr) applied to plants nine population sizes ranging between 535 2701 covering 100 -1000 ha. aims the study were investigate efficacy method used pallida; impacts invasions on native vegetation integrity; apply species distribution models (SDMs) identify suitable climates Africa; document biomes vulnerable negative impact Results show that killed many (mean percentage dead ± SE, 83.3 6.4; n = 9; range, 70-96%), adult taking about 2 months die completely. was not affected by plant size or used. invaded site had significantly greater cover which persisted across winter compared uninvaded site, but latter site's dropped winter. Also, lower diversity than dominated Poaceae Asteraceae families. Additionally, normalised difference index (NDVI) analysis shows higher health wherein notable decline observed 2019 2022. A large area (> 15 million hectares) predicted be invasion provinces arid warm temperate - fynbos grassland are most vulnerable. Because impacts, high environmental compatibility, cost clearing infestations, we advocate considering biocontrol effectively managing

Language: Английский

Citations

4
Minimal Soil Impacts of Caesalpinia decapetala Invasion in South Africa's Vhembe Biosphere Reserve DOI Creative Commons
Luambo Jeffrey Ramarumo, Gladman Thondhlana, Sheunesu Ruwanza

et al.

African Journal of Ecology, Journal Year: 2025, Volume and Issue: 63(2)

Published: March 1, 2025

ABSTRACT We assessed the effects of Caesalpinia decapetala (Roth) Alston invasion on soil physical properties over 3 summer months in Vhembe Biosphere Reserve, South Africa. Topsoils were collected beneath replicated invaded and uninvaded conditions for moisture, water repellency, penetration resistance, infiltration hydraulic conductivity. Results showed no significant ( p > 0.05) differences between resistance levels rates, but monthly variations observed moisture It appears C. affects some not all properties; therefore, ecosystem recovery after removal can be spontaneous.

Language: Английский

Citations

0
Soil seed banks after Acacia dealbata Link invasion and removal: implications for restoration DOI Creative Commons
Sheunesu Ruwanza

Ecological Processes, Journal Year: 2025, Volume and Issue: 14(1)

Published: March 14, 2025

Abstract Background Acacia dealbata Link is a problematic invasive alien tree in South Africa, with severe environment effects such as native plant displacement and soil nutrient manipulation (nitrogen fixation). Most studies on A. invasion are aboveground vegetation effects, few belowground seed bank impacts associated both removal for restoration purposes. This study assessed the impact of banks grasslands targeted ecological upper Tsitsana communal area Eastern Cape Province, Africa. Soils were collected from invaded, cleared, uninvaded treatments germinated an ambient greenhouse over 11 months. We measured species diversity, density, frequency occupancy, identified all seedlings that trays measuring 20 cm wide × long 15 deep. Results Species richness abundance significantly ( P < 0.001) lower cleared invaded compared to treatment, this trend being more pronounced forbs graminoids than trees shrubs, indicating growth-form specific. density was treatment treatments. The increased composition woody Diospyrus Searsia occurring treatment. Conclusions concludes reduces community diversity grasslands. However, appear adequate facilitate grassland recovery following .

Language: Английский

Citations

0
Knowing-Doing Continuum or Knowing-Doing Gap? Information Flow Between Researchers and Managers of Biological Invasions in South Africa DOI Creative Commons
Llewellyn C. Foxcroft, Brian W. van Wilgen, Brent Abrahams

et al.

Springer eBooks, Journal Year: 2020, Volume and Issue: unknown, P. 831 - 853

Published: Jan. 1, 2020

Language: Английский

Citations

20
Prioritisation of targets for weed biological control III: a tool to identify the next targets for biological control in South Africa and set priorities for resource allocation DOI
Kim Canavan, Iain D. Paterson, Philip Ivey

et al.

Biocontrol Science and Technology, Journal Year: 2021, Volume and Issue: 31(6), P. 584 - 601

Published: April 29, 2021

Biological control is an effective and sustainable method for management of invasive alien plants (IAPs), has been implemented on 68 the 367 plant species that are listed as legally requiring strategies under South Africa's National Environmental Management: Biodiversity Act (10/2004): Alien Invasive Species Regulations. With limited resources funding available, it can realistically only be considered a subset remaining which biocontrol not yet implemented. Considerable allocated towards in African past, principally through Working Water Programme Nature Resource Management Programmes (Department Environment, Forestry Fisheries), this support expected to continue with intention increasing number IAPs approach future. To ensure appropriate targets selected, Control Target Selection (BCTS) system was applied list (299 species). This paper presents resultant top priority represent good investments when funds available.

Language: Английский

Citations

17
Perceptions of Acacia dealbata invasion and clearing in Upper Tsitsana villages in the Eastern Cape Province of South Africa DOI Creative Commons

Nwabisa Coka,

Gladman Thondhlana, Sheunesu Ruwanza

et al.

Forests Trees and Livelihoods, Journal Year: 2024, Volume and Issue: 33(2), P. 101 - 117

Published: Jan. 17, 2024

Tree holdings provide important socio-economic and environmental benefits, but invasive alien trees can constrain these benefits. However, some plants both costs making management complex due to varied stakeholder perceptions. Using household surveys, the study explored local people's perceptions of Acacia dealbata invasion clearing in six villages located upper Tsitsana communal areas, Eastern Cape Province South Africa. The results suggest that most respondents are aware A. not its status. valued for service provision including firewood, construction poles shade also cited negative impacts such as loss grazing land water. were Working Water programme reported employment, income, awareness restored increased water availability key Although cleared their homesteads, a small percentage opposed perceived Overall, shows conflicting on clearing, highlighting value considering social dimensions plant species avoid conflict generation.

Language: Английский

Citations

2