Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
03 January 2020 | Story Leonie Bolleurs | Photo Leonie Bolleurs
Research read more
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

Media: Sunday Times
2006-05-20

Sunday Times, 4 June 2006

True leadership may mean admitting disunity
 

In this edited extract from the inaugural King Moshoeshoe Memorial Lecture at the University of the Free State, Professor Njabulo S Ndebele explores the leadership challenges facing South Africa

RECENT events have created a sense that we are undergoing a serious crisis of leadership in our new democracy. An increasing number of highly intelligent, sensitive and committed South Africans, across class, racial and cultural spectrums, confess to feeling uncertain and vulnerable as never before since 1994.

When indomitable optimists confess to having a sense of things unhinging, the misery of anxiety spreads. We have the sense that events are spiralling out of control and that no one among the leadership of the country seems to have a definitive handle on things.

There can be nothing more debilitating than a generalised and undefined sense of anxiety in the body politic. It breeds conspiracies and fear.

There is an impression that a very complex society has developed, in the last few years, a rather simple, centralised governance mechanism in the hope that delivery can be better and more quickly driven. The complexity of governance then gets located within a single structure of authority rather than in the devolved structures envisaged in the Constitution, which should interact with one another continuously, and in response to their specific settings, to achieve defined goals. Collapse in a single structure of authority, because there is no robust backup, can be catastrophic.

The autonomy of devolved structures presents itself as an impediment only when visionary cohesion collapses. Where such cohesion is strong, the impediment is only illusory, particularly when it encourages healthy competition, for example, among the provinces, or where a province develops a character that is not necessarily autonomous politically but rather distinctive and a special source of regional pride. Such competition brings vibrancy to the country. It does not necessarily challenge the centre.

Devolved autonomy is vital in the interests of sustainable governance. The failure of various structures to actualise their constitutionally defined roles should not be attributed to the failure of the prescribed governance mechanism. It is too early to say that what we have has not worked. The only viable corrective will be in our ability to be robust in identifying the problems and dealing with them concertedly.

We have never had social cohesion in South Africa — certainly not since the Natives’ Land Act of 1913. What we definitely have had over the decades is a mobilising vision. Could it be that the mobilising vision, mistaken for social cohesion, is cracking under the weight of the reality and extent of social reconstruction, and that the legitimate framework for debating these problems is collapsing? If that is so, are we witnessing a cumulative failure of leadership?

I am making a descriptive rather than an evaluative inquiry. I do not believe that there is any single entity to be blamed. It is simply that we may be a country in search of another line of approach. What will it be?

I would like to suggest two avenues of approach — an inclusive model and a counter-intuitive model of leadership.

In an inclusive approach, leadership is exercised not only by those who have been put in some position of power to steer an organisation or institution. Leadership is what all of us do when we express, sincerely, our deepest feelings and thoughts; when we do our work, whatever it is, with passion and integrity.

Counter-intuitive leadership lies in the ability of leaders to read a problematic situation, assess probable outcomes and then recognise that those outcomes will only compound the problem. Genuine leadership, in this sense, requires going against probability in seeking unexpected outcomes. That’s what happened when we avoided a civil war and ended up with an “unexpected” democracy.

Right now, we may very well hear desperate calls for unity, when the counter-intuitive imperative would be to acknowledge disunity. A declaration of unity where it manifestly does not appear to exist will fail to reassure.

Many within the “broad alliance” might have the view that the mobilising vision of old may have transformed into a strategy of executive steering with a disposition towards an expectation of compliance. No matter how compelling the reasons for that tendency, it may be seen as part of a cumulative process in which popular notions of democratic governance are apparently undermined and devalued; and where public uncertainty in the midst of seeming crisis induces fear which could freeze public thinking at a time when more voices ought to be heard.

Could it be that part of the problem is that we are unable to deal with the notion of opposition? We are horrified that any of us could be seen to have become “the opposition”. The word has been demonised. In reality, it is time we began to anticipate the arrival of a moment when there is no longer a single, overwhelmingly dominant political force as is currently the case. Such is the course of history. The measure of the maturity of the current political environment will be in how it can create conditions that anticipate that moment rather than seek to prevent it. We see here once more the essential creativity of the counter-intuitive imperative.

This is the formidable challenge of a popular post-apartheid political movement. Can it conceptually anticipate a future when it is no longer overwhelmingly in control, in the form in which it is currently, and resist, counter-intuitively, the temptation to prevent such an eventuality? Successfully resisting such an option would enable its current vision and its ultimate legacy to our country to manifest in different articulations, which then contend for social influence. In this way, the vision never really dies; it simply evolves into higher, more complex forms of itself. Consider the metaphor of flying ants replicating the ant community by establishing new ones.

We may certainly experience the meaning of comradeship differently, where we will now have “comrades on the other side”.

Any political movement that imagines itself as a perpetual entity should look at the compelling evidence of history. Few movements have survived those defining moments when they should have been more elastic, and that because they were not, did not live to see the next day.

I believe we may have reached a moment not fundamentally different from the sobering, yet uplifting and vision-making, nation-building realities that led to Kempton Park in the early ’90s. The difference between then and now is that the black majority is not facing white compatriots across the negotiating table. Rather, it is facing itself: perhaps really for the first time since 1994. Could we apply to ourselves the same degree of inventiveness and rigorous negotiation we displayed leading up to the adoption or our Constitution?

This is not a time for repeating old platitudes. It is the time, once more, for vision.

In the total scheme of things, the outcome could be as disastrous as it could be formative and uplifting, setting in place the conditions for a true renaissance that could be sustained for generations to come.

Ndebele is Vice-Chancellor of the University of Cape Town and author of the novel The Cry of Winnie Mandela

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept