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Curiosity about environmental changes drives Dr Katlego Mashiane’s PhD research

21 April 2023 | Story Leonie Bolleurs | Photo Supplied

Striving to make a difference in the field of biodiversity conservation, Dr Katlego Mashiane decided to pursue a PhD in Geography, focusing on the spatial modelling of grassland diversity and nutrients in subalpine environments. He received his PhD during the recent April graduation ceremonies on the Qwaqwa Campus.

In the small village of Ga-Mabotia about 25 km outside of Polokwane, Dr Katlego Mashiane grew up, surrounded by rocky mountains characterised by boulder outcrops, where he interacted with nature from an early age.

He recently obtained his PhD, majoring in Geography, from the University of the Free State (UFS), which was conferred on him during the April graduation ceremonies that took place on the UFS Qwaqwa Campus. The title of his dissertation is Grass nutrients estimation as an Indicator of rangeland quality using satellite remote.

Predicting the presence of biodiversity and nutrients in an area

Based on the principle that diverse grasslands tend to perform better, environmental changes threaten the resilience and services these grassland ecosystems provide. The study examined how many different types of plants and animals can be found at a particular place to enhance our understanding of the ecosystem’s value to humans, and that biodiversity loss will reduce these ecosystem services. Focusing on spatial modelling of grassland diversity, Dr Mashiane specifically investigated the influence of topography and remotely sensed satellite data on species richness and diversity in subalpine environments, and how they are affected by the availability of grass species. To determine this, he used a random forest machine-learning algorithm to find the best information in the data that could be used to estimate the levels of species richness, diversity, and nitrogen in a protected national conservation park.

His study discovered that some data types – such as the near-infrared variable and certain vegetation data (EVI and SAVI) – were especially useful for determining the number and variety of species in a certain area. With this information, scientists can create models that predict the presence of different types of biodiversity and nutrients in an area.

Playing a key role in protecting our natural assets

Equipped with this knowledge, one will be able to understand how to protect and preserve different types of biodiversity and promote the nutritional value of both plants and animals in the environment. “Land managers could use this information for conservation strategies,” states Dr Mashiane, who decided to pursue this study because he was curious about how environmental changes will affect species.

“Grasslands provide important ecosystem services underpinning human well-being, and therefore warrant our protection; I would like to play a role in protecting our natural assets and contribute to understanding our biomes, especially in the context of global change,” he says.

In the next five years, Dr Mashiane plans to pursue further research and mentor other students in his field of study.

News Archive

Kovsie trailblazing track runner sets South African 200 m record

2015-07-16

Photo: IAAF

Wayde van Niekerk became the only South African, and the fourth athlete in the world, to clock sub-20-seconds in a 200 m race on Tuesday 14 July 2015. With this winning time, he became the fourth member of the prestigious quartet, consisting of Michael Johnson, LaShawn Merritt, Isaac Makwala and himself.

The Kovsie gold medallist’s ground-breaking performance saw him beat world-class 200 m specialist and last year's Diamond League race winner, Alonso Edward of Panama. Van Niekerk crossed the finish line half a metre ahead of Edward, who was followed by Fujmitsu Kenji of Japan in the third place.

Van Niekerk's 19.94-time at the Diamond League meeting in Lucerne (Switzerland) set a national record, and improved on his personal best. In 2010, he claimed the World Junior Championship title in Moncton, Canada, by covering 200 m in 21.02 seconds.

Recently, he made history by defeating the London 2012 Olympic Games champion, Kirani James, of Grenada in the Caribbean.

On 4 July 2015, he surged 0.79 seconds ahead of Kirani in his number five lane, becoming the first African to cover 400m in less than 44 seconds. The Kovsie student won the race at 43.96, occupying 10th place on the International Association of Athletics Federations (IAAF) Diamond League all-time list.

Kovsies were still celebrating the gold medalist’s South African record-setting time of 44.24 on 13 June 2015 when he dominated the Diamond League meeting. At the previous race in New York, Van Niekerk improved on his own national record of 44.38. With an impressive dash to the finish line at that particular event, he surpassed Christopher Brown’s 400 m record.

In addition to the country’s record, Van Niekerk made his name as one of the continent’s record-breakers. On 7 June 2015, he broke the 1986 African 300 m record. Van Niekerk replaced Ivorian Gabriel Tiacoh’s best time of 31.74 with a 31.63 championship win at the Birmingham Diamond League meeting. Simultaneously, he bettered Morné Nagel’s 2006 South African national record.

Following his outstanding performance, he was positioned in 10th place on the world list in the men’s 300 m.

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