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05 August 2022 | Story Leonie Bolleurs | Photo Supplied
Marike Stander
For the first time in her life, Marike Stander accompanied a group of researchers for their annual relief expedition with the SA Agulhas II from Cape Town to Marion Island, where she assisted with fieldwork and data collection. Here she is pictured at the snow-covered Karookop.


The Prince Edward Islands are the most southerly part of South Africa’s official territory and consist of Marion Island and Prince Edward Island. On Marion Island, about 270 km² in size and situated in the sub-Antarctic Indian Ocean, 1 920 km from the South African shore, activities are restricted to research and conservation management. 

This is where Marike Stander, Lecturer in the Department of Geography at the University of the Free State (UFS), was granted the opportunity to assist a research group led by Prof Werner Nel (University of Fort Hare) and Prof David Hedding (Unisa) – based on her knowledge and experience in tracer sampling. 

Back home, Stander is working to complete her doctoral research, investigating the often-overlooked major issue of soil erosion. She believes the management of soil erosion, a global issue, is key. According to her, it impacts the storage of carbon and nutrients, and therefore the production of food, but it can also act as a pollutant in water sources.

Fieldwork and data collection

She was approached by the Sub-Antarctic Landscape-Climate Interactions (SANAP-LCI) Research Group, a project funded by the South African National Antarctic Programme-NRF. One of their research objectives is to explore the viability of using geochemical tracers in the substrate on Marion Island, the focus of Stander’s doctoral research. 

With the support of the UFS Faculty of Natural and Agricultural Sciences and the Department of Geography, she was released to accompany the research group for the first time in her life on their annual relief expedition with the SA Agulhas II from Cape Town to Marion Island, where she assisted with fieldwork and data collection. During this three-week field campaign, Stander collected sediment samples for the tracer project, as well as rock and peat samples.

With the SANAP-LCI group collaborating with research labs in the United Kingdom and France, she was able to bring her expertise to the table, while at the same time learning about other geochronological techniques and field methods.  

She was also excited about the exposure to the work of a myriad of researchers in various fields from around the world. Stander says in a time when the importance of interdisciplinary and multidisciplinary work is being emphasised, it was invaluable to meet and learn from various distinguished scientists.  “It changes your perspective and allows your mind to not only think outside the box, but also to think about all the interconnected boxes and how they affect each other.”

She believes being exposed to various sampling strategies from different scientists also broaden one’s skill set and experience. “Using your capabilities and skills in a different setting builds depth to your skill set and expands your horizon.”

Volcanoes and albatrosses 

Very few people get the opportunity to visit Marion Island. Thus, just the chance to visit and experience life on the island is described by many as one of their most memorable events. Always fascinated by volcanic features, Stander was completely captivated by this relatively young volcanic island. “There are so many interesting features, such as the pahoehoe and a’a lava flows, as well as the numerous scoria cones,” describes Stander, who cannot believe that she managed to cover the vast distances in gumboots, the only footwear that are effective to cross anything – from razor-sharp rocks to deep waterlogged mires.

She was also overwhelmed by the flora and fauna on the island.  “It is so very different from what we are used to and from what I’ve experienced before.  Seeing these animals in a relatively untouched remote location really captivated me,” she says. 

“More specifically, I fell in love with the albatrosses.  These remarkable seabirds cover vast distances over the ocean looking for food. They are unfortunately threatened by the invasive mice on Marion Island.” Stander invites people to help organisations such as Mouse-Free Marion to take on the difficult task of eradicating these mice. Find them at www.mousefreemarion.org.

On a lighter note, Stander also learnt a thing or two that was totally new to her. For instance, that there are radio telescopes installed on the radio-quiet Marion Island, searching for the universe’s first stars. And that male elephant seals that drive out all other male competitors during mating season are called ‘beachmasters’. She learned that these ‘beachmaster’ bulls have a harem of female elephant seals and can weight up to three tons.


• She wishes to thank Prof Werner Nel, Prof David Hedding, and Dr Liezel Rudolph (UFS) from the SANAP-LCI project for affording her the opportunity to join the expedition. She also thanks the SANAP-NRF and the Department of Forestry, Fisheries, and the Environment for making the expedition possible. 

News Archive

Sunflowers are satellite dishes for sunshine, or are they?
2016-07-20

Eighty-six percent of South Africa’s
sunflowers are produced in the
Free State and North West provinces.

Helen Mirren, the English actress, said “the sunflower is like a satellite dish for sunshine”. However, researchers at the University of the Free State (UFS) have found that too much of this sunshine could have a negative effect on the growth of sunflowers, which are a major source of oil in South Africa.

According to Dr Gert Ceronio from the Department of Soil, Crop, and Climate Sciences at the UFS, extremely high soil temperatures play a definite role in the sprouting of sunflower seedlings. Together with Lize Henning, professional officer in the department, and Dr André Nel from the Agricultural Research Council, he is doing research on biotic and abiotic factors that could have an impact on sunflowers.

Description: Sonneblom 2 Tags: Sonneblom 2

Various degrees of deformity (bad-left
to none-right) in seedlings of the same
cultivar at very high soil temperatures.
Photo: Dr Gert Ceronio

Impact of high temperatures on sunflower production

The Free State and North West provinces, which produce 86% of South Africa’s sunflowers, are afflicted especially by high summer temperatures that lead to extremely high soil temperatures.

Dr Ceronio says: “Although sunflower seeds are able to germinate at temperatures from as low as 4°C to as high as 41°C, soil temperatures of 35°C and higher could have a negative effect on the vegetative faculty of sunflower seedlings, and could have an adverse effect on the percentage of sunflowers that germinate. From the end of November until mid-January, this is a common phenomenon in the sandy soil of the Free State and North West provinces. Soil temperatures can easily exceed the critical temperature of 43°C, which can lead to poor germination and even the replanting of sunflowers.”

Since temperature have a huge impact not only on the germination of sunflower seeds, but also on the vegetative faculty and sprouting of sunflower seedlings, Dr Ceronio suggests that sunflowers should be planted in soil with soil temperatures of 22 to 30°C. Planting is usually done in October and early November. Unfortunately, this is not always possible, as soil moisture is not optimal for growth. Farmers are then compelled to plant sunflowers later.

Impact of herbicides on sunflower growth

“High soil temperatures, combined with the herbicide sensitivity of some cultivars, could lead to the poor development of seedlings," says Dr Ceronio.

The use of herbicides, such as ALACHLOR, for the control of weeds in sunflowers is common practice in sunflower production. It has already been determined that ALACHLOR could still have a damaging effect on the seedlings of some cultivars during germination and sprouting, even at recommended application dosages.

“The purpose of the continued research is to establish the sensitivity of sunflower cultivars to ALACHLOR when exposed to high soil temperatures,” says Dr Ceronio.

 

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