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03 January 2020 | Story Leonie Bolleurs | Photo Leonie Bolleurs
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Dr Sandy Steenhuisen conducts research on invasive alien plants and the effect they have on the environment.

South Africa, and more specifically the Free State, is known as a drought-stricken area. Invasive alien plants are gulping up much-needed water resources, draining our land. 

Pollination ecologist, Dr Sandy-Lynn Steenhuisen, who is also expanding into invasive alien research, is conducting research on the reproductive ecology of exotic plant species in montane grasslands. As an affiliate of the Afromontane Research Unit (ARU) and Senior Lecturer in the Department of Plant Sciences at the University of the Free State (UFS), this research is conducted with her students and a host of collaborators from Rhodes University (Centre for Biological Control), Stellenbosch University (Centre for Invasion Biology), and the University of KwaZulu-Natal.  

She says substantial funding is being made available for research on invasive species due to the extent of the problem nationally and globally. Their research is being funded and conducted in collaboration with plant ecology experts, Dr Kim Canavan (Rhodes University), Dr Grant Martin (Rhodes University), Prof David Richardson (Stellenbosch University), and Prof Colleen Downs (University of KwaZulu-Natal), as well as UFS postgraduate students Anthony Mapaura and Lehlohonolo Donald Adams, and UFS postdoctoral fellow, Dr Nicholas Le Maitre. 

Besides working with a host of collaborators, the ARU was this year also invited to join the prestigious Mountain Invasion Research Network (MIREN), a global network of academics who are passionate about understanding the invasion of mountains by non-native species and its impact on local mountain ecologies.  

Black Wattle makes rivers run dry 

Alien plant species that often escape from planted gardens or plantations, thrive in disturbed, mismanaged and eroded areas. One of the biggest issues regarding alien plant invasion is that many people are not aware of the harmful effects it has on the environment, and that they continue to plant it or allow invaders to spread. 

A large percentage of trees in urban South Africa are invasive alien trees. They dry out the soil and displace our native plants. Coming from other countries and without their former enemies or competitors, they flourish. Our indigenous plants are not used to these plants and are easily displaced.  

An example of a very aggressive invasive alien plant in the region, and in South Africa as a whole, is Black Wattle. It uses excessive water, so bad that rivers run dry and riverbanks become eroded. It also chemically excludes many native plants from growing among them. 

Research content 1
Anthony Mapaura’s research focuses on Nassella, an invasive alien grass in the elevated areas of the Eastern Cape mountains.
This plant is extremely difficult to control and is the cause of a large number of  cattle dying. (Photo: Leonie Bolleurs)

This species is very hard to control. If you burn it or cut it off, it will grow back. In addition, it drops a great number of seeds into the soil, spreading without any difficulty.  

Another invader, Yellow Firethorn, which is being investigated by master’s student Adams, invades high-elevation grassland areas, reducing grazing potential and ultimately leading to unproductive farmland and choked rivers.  

“Our mountain grassland systems are not adapted to compete with the invasion of these alien trees. Since they are using excessive water resources, natural streams should return in many instances if they are removed,” says Dr Steenhuisen. 

Nassella displacing indigenous plants 

Mapaura focuses his doctoral study on an invasive grass genus, Nassella, originating from the Americas. Growing in the elevated areas of the Eastern Cape mountains, this species is the cause of a large number of cattle dying.  

The plant, which is not palatable and consists mostly of fibre, is eaten by cattle – especially during dry seasons when there is not much natural grazing available. It is difficult to digest, forming a ball in the stomach of the animals that ultimately results in death.  

“It is extremely difficult and costly to control, and natural grasses cannot compete with it. In Australia, many farmers have had to abandon their farms once these plants invaded, as the cost of control was higher than the value of the land. A similar situation could unfold in South Africa, and it’s a race to learn all we can about the ecology of this genus to inform policy and practice,” says Dr Steenhuisen. 

The solution, fighting for survival 

She said to effectively address these invasions, we need to understand everything about the reproductive ecology of the plants to develop specific biological or chemical control methods to target and destroy the plant at an appropriate life stage. We also need to know if the plants are using native animals (if not just wind and water) to pollinate their flowers and spread their seeds. “Organisations investigating the effectiveness of biological control agents and chemical products will be able to use our research data on the plants’ ecology to focus efforts on specific life stages,” she adds. 

Invasive alien plants also contribute to South Africa losing the genetic integrity of certain native plants with which they hybridise. For example, pure genetic lines of native white stinkwood trees are potentially mixing with exotics and hybrids, adding to a loss of diversity and genetic purity – a project being undertaken by postdoctoral fellow, Dr Le Maitre.  

Dr Steenhuisen urges South Africans to plant the genetically pure South African white stinkwood trees, especially since alien species and hybrids are often sold by garden centres as if they were the indigenous species.  

Dr Vincent Ralph Clark, Head of the Afromontane Research Unit at the UFS, has a vision to start a nursery for high-elevation indigenous plants. “A great number of nurseries do not supply pure indigenous trees, but hybrids,” says Dr Steenhuisen.  

 

News Archive

Kovsie Sportsman and Sportswoman of the Year
2011-10-19

 

Thuso Mpuang en Gabisile Hlumbane
Foto: Leonie Bolleurs

KovsieSport honoured its top achievers at a glamorous gala dinner in the Centenary Complex on our Bloemfontein Campus on 13 October 2011.

The KovsieSportsman and KovsieSportswoman of the year were Thuso Mpuang and Gabisile Hlumbane respectively.

Gabisile is a member of the Banyana Banyana National Soccer Team. The team obtained a bronze medal at the African Women’s Championships during October 2010, a gold medal at the Unity Cup Hosted during December 2010, a silver medal at the COSAFA Women’s Championship hosted during July 2011 and qualified for the London Olympics in 2012.

Thuso represented South Africa during the World Athletic Championships in Deague, Korea. He obtained the silver medal in the 200m during the World Student Games in Shenzhen, China and a gold medal as a member of the 4 x 100m relay team.

Pieter Rademan (rugby) and Karla Mostert (netball) were named as the Junior Sportman and Sportwoman of the year, respectively.

Other nominations for this year in the women’s category were:

  • Lesley Ann George (hockey) – Represented the Protea Women’s Hockey Team during the series against China, Belgium and Azerbajan. She was also a member of the Protea Women’s Hockey Team during the Champs Challenge in Ireland. The team finished fifth.
  • Nicole de Vries (hockey) – Represented the Protea Women’s Hockey Team during the series against China, Belgium and Azerbajan. She was also a member of the Protea Women’s Hockey Team during the Africa Cup in Bulawayo.  The team obtained a gold medal.
  • Hettie Oosthuizen (hockey) – Represented the Protea Women’s Hockey Team during the series against China, Belgium and Azerbajan.
  • Izelle Lategan (hockey) – Represented the Protea Women’s Hockey Team during the series against China, Belgium and Azerbajan.
  • Nicole Kemp (hockey) – Member of the Protea Women’s Hockey Team during the Africa Cup in Bulawayo. The team obtained a gold medal.
  • Nelmaré Loubser (triathlon) – Represented the SA Elite Team during the World Championships in Spain.
  • Janette Siebert (athletics) – Represented South Africa during the Southern Africa Championships in Maputo, Mozambique.
  • Elsabe le Roux (karate) – Member of Protea JKA Shotokan Karate team that participated in the Africa Zone 6 Championships in Maputo where she obtained a gold and silver medal.

Other nominations for this year in the men’s category were:

  • Boy Soke (athletics) - Represented South Africa during the Africa Cross Country Championships in Cape Town. He also represented South Africa during the World Cross Country Championships in China.
  • Boom Prinsloo (rugby) – He represented the Springboks in the HSBC Sevens World Series 2010 – 2011.
  • Bruno Schwalbach (karate) – Member of the Protea JKA Shotokan Karate team that participated in the Africa Zone 6 Championships in Maputo where he obtained two gold medals. He was also a member of the Protea JKA Shotokan Karate team that participated in the Common Wealth Karate Championship in Australia where he obtained one silver and two bronze medals. He was a member of the Protea JKA Shotokan Karate team that participated in the All Africa Games in Maputo Mozambique where he obtained a bronze medal.
  • Paul Rodrigues (squash) – He represented the South African U/ 23 team at the All Africa Squash Championships in Johannesburg.
  • Balungile Nchofe (karate) – He was a member of Protea JKA Shotokan Karate team that participated in the Africa Zone 6 Championship in Maputo where he obtained a gold medal.
     

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