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05 June 2018 Photo Supplied
Digging up truth South Africa was way different to what you thought
Archaeological excavations in the Wonderwerk Cave, north of Kuruman in the Northern Cape.

Research fellow Dr Lloyd Rossouw from the Department of Plant Sciences at the University of the Free State (UFS) recently published an article in the Nature Ecology and Evolution journal with Dr Michaela Ecker from the University of Toronto as lead author, and Dr James Brink, research fellow at the UFS Centre for Environmental Management. The findings described in “The palaeoecological context of the Oldowan-Acheulean in southern Africa” provides the first extensive paleoenvironmental sequence for the interior of southern Africa by applying a combination of methods for environmental reconstruction at Wonderwerk Cave, which have yielded multiple evidence of early human occupation dating back almost two million years ago.

Where water once was
The Wonderwerk Cave is found north of the Kuruman hills (situated in Northern Cape) a 140m long tube with a low ceiling. The surroundings are harsh. Semi-arid conditions allow for the survival of only hardy bushes, trees, and grasses. But during the Early Pleistocene, stepping out of the Wonderwerk Cave you would have been greeted by a completely different site, the researchers found. Using carbon and oxygen stable isotope analysis on the teeth of herbivores (Dr Ecker), fossil faunal abundance (Dr Brink), as well as the analysis of microscopic plant silica remains (phytoliths) excavated from fossil soils inside the cave (Dr Rossouw), the results show that ancient environments in the central interior of southern Africa were significantly wetter and housed a plant community unlike any other in the modern African savanna. 

What difference does it make?
While East African research shows increasing aridity and the spread of summer-rainfall grasslands more than a million years ago, the results from this study indicate an interesting twist. During the same period, shifts in rainfall seasonality allowed for alternating summer and winter-rainfall grass occurrences coupled with prolonged wetlands, that remained major components of Early Pleistocene (more or less the period between one and two million years ago) environments in the central interior of southern Africa. That means our human ancestors were also living and evolving in environments other than the generally accepted open, arid grassland model.

News Archive

Early nutrition impacts on burden of disease
2017-11-15


 Description: Corinna Walsh read more Tags: Corinna Walsh read more

Prof Corinna Walsh during her inaugural lecture on ‘Nutrition in Transition’.
Photo: Stephen Collett 

“The first 1 000 days, from conception to two years, is a critical time to ensure that the early environment is optimal to guarantee the best outcomes,” Prof Corinna Walsh, Professor in the Department of Nutrition and Dietetics at the University of Free State (UFS), said. She delivered her inaugural lecture on Nutrition in Transition on 30 October 2017. 

During her lecture, Prof Walsh explained how an unfavourable early environment impacts on the health and well-being of both children and adults. She gave an overview of the prevalence of hunger and food insecurity in the Free State, and described the shift that has occurred from healthier traditional diets to more unhealthy Western diets accompanied by sedentary lifestyles. These patterns are closely linked to the triple burden of malnutrition, including undernutrition, micro-nutrient malnutrition, and obesity. Finally, Prof Walsh highlighted the double burden of disease, focusing on chronic lifestyle diseases on the one hand, and infectious diseases such as HIV/AIDS and TB on the other hand.

“Preparing for this lecture has given me the opportunity to reflect on the almost thirty years of my research journey, a process that I thoroughly enjoyed,” said Prof Walsh.

“It was a privilege to share the work of my research team with fellow colleagues as well as with family and friends,” she said. Prof Walsh is a National Research Foundation C-rated researcher and also served on the Board of the Medical Research Council from 2005 to 2010.

Foundations for health, growth established early
The first 1 000-day window focuses on the time between conception and the second birthday. “This is a critical period for growth and development,” Prof Walsh said. It is a unique period, as the foundations for health, growth, and neuro-development are established. It also focused on the implications of malnutrition, which is the biggest risk factor contributing to the global burden of disease.


Research identifies burden of disease
Her research has made a considerable contribution to identifying the burden of disease in the Free State. “It focuses on both malnutrition and infectious diseases such as HIV and TB on the one hand, and chronic lifestyle diseases such as obesity, diabetes, and hypertension on the other,” she said. The research team have also implemented a number of interventions to address these challenges, including programmes that have assessed the impact of nutrition-education programmes, household food gardens, and nutrition supplementation.

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