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28 November 2019 | Story Leonie Bolleurs
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Dr Sandy-Lynn Steenhuisen and Ruth Cozien at a spot high up in the Maloti-Drakensberg World Heritage Site, close to Sentinel Peak, photographing a Drakensberg crag lizard underneath the leaves of the ‘Hidden Flower’.

Flowers high up in the Maloti-Drakensberg World Heritage Site made world news when it was discovered that the Drakensberg Crag Lizard is their sole pollinator. 

This first for continental Africa – a plant being pollinated by a lizard – is a discovery by a research group including Dr Sandy-Lynn Steenhuisen, Senior Lecturer in the Department of Plant Sciences and affiliate of the Afromontane Research Unit (ARU) at the Qwaqwa Campus of the University of the Free State (UFS), in collaboration with Dr Timo van der Niet, Prof Steven Johnson, and project leader Ruth Cozien, all from the Pollination Ecology Research Laboratory and Centre for Functional Biodiversity at the University of KwaZulu-Natal.

Besides their work being published in popular news here in South Africa (including an isiZulu article), it has also received coverage in, among others, Belgium, Canada, the Netherlands, and the United States of America. 

Is it a bee, a bird, perhaps a mouse?

‘Hidden Flower’, true to its name, is a plant species with flowers hidden at ground level, underneath the leaves of the plant. Like the leaves, the flowers are also green. With the flowers filled with nectar (up to 1 ml per plant) and strongly scented, one concludes that, just as with other flowers, these flowers must be visited by a pollinator. Is it a bee, is it a bird, perhaps a mouse/non-flying mammal?

According to Dr Steenhuisen, who was brought into the project because of her experience with rodents pollinating proteas, many plants are adapted to attract and be pollinated by a specific animal. They attract their pollinators using particular scents and colours and reward them for their service with, for example, nectar, oil, fragrance, and sometimes even shelter. 

The ‘Hidden Flower’ initially had the group of researchers thinking that it was being pollinated by a non-flying mammal. “Everything about the plant made it look like it should be mammal-pollinated,” Dr Steenhuisen said. 

They investigated all options, using several techniques to assess the contribution of different possible animals to set seed. To further assist them in their quest to find the true pollinator, the team put up motion cameras that recorded activity in the area of the ‘Hidden Flower’. 

Great was their surprise when studying the video material after a week of fieldwork in the mountains, finding shy lizards dipping their snouts in the ‘Hidden Flower’ and lapping up the nectar.

Dr Steenhuisen described this discovery as completely bizarre, exciting, and fascinating. 

To make 100% sure that lizards are pollinating the ‘Hidden Flower’, these animals were excluded from the plants. Results published in a paper in Ecology showed that when the lizards were experimentally excluded from the plants, the number of seeds produced dropped dramatically by almost 95%. This finding helped to further prove their discovery. 

Strong scent and bright orange colour attract

The team researched the new phenomenon and found that although flower visitation by lizards is not unknown, it occurs almost exclusively on oceanic islands. Cozien says one should keep in mind that mountains are like sky islands and might therefore have similarities with oceanic islands in terms of their ecology.

The strong scent and the touch of orange at the base of the inside of the flowers is believed to play an important role in attracting lizards. The little lizard may recognise the spots of orange inside the flowers which resemble the orange colour of a male lizard in mating season, attracting females. Lured by the strong scent and the orange spots, the reptiles stick their snouts into the flower in search of nectar, pollinating the ‘Hidden Flower’; thus, making sure that this flower will continue to grow on the slopes of Sentinel Peak in the Maloti Drakensberg range. 

This research finding on lizard pollination, which reads almost like a fairy tale with its islands, hidden flowers, nectar from the gods, and little dragons, shows that there are still many unknown and surprising interactions that need to be discovered and conserved to ensure a healthy ecological system. 

The research findings of this study were published in April 2019. 

News Archive

Young researchers shine during Afromontane Colloquium
2016-12-01

Description: Afromontane Colloquium  Tags: Afromontane Colloquium  

From the left are Drs Reetu Sogani (India),
Greg Greenwood (US-Switzerland), Teboho Manchu
(Acting Campus Principal), Drs Jianchu Xu (China),
Henri Rueff (Switzerland), Glen Taylor (Senior Director:
Research Development), and Elsa Crause
(Campus Vice-Principal: Academic and Research).

The University of the Free State’s Afromontane Research Unit (ARU), which is situated on the Qwaqwa Campus, has the potential to produce some of the world’s best and dynamic young researchers. This is the view of Dr Henri Rueff, who was one of the keynote speakers during the recent ARU Colloquium hosted at Golden Gate in the Eastern Free State.

Dr Rueff, a geographer and environmental economist from the Universities of Basel and Bern in Switzerland, was referring to no less than ten Qwaqwa Campus postgraduate students who made oral and poster presentations during the inaugural international colloquium.

“You have some of the world’s most motivated and highly skilled students who have the courage to stand in front of extremely critical scientists from all over the globe – and that must be commended,” he said.

Also talking about the students at the colloquium, was Dr Reetu Sogani from India, who said that her first trip to South Africa did not disappoint. “This colloquium was a very good learning experience for me as I had the opportunity to interact with brilliant and young scientists from this part of the world,” she added. In closing the colloquium, the Senior Director: Research Development, Dr Glen Taylor, committed the UFS to the success of the unit.

“The ARU will strengthen the research output of the campus. But most critically, it is setting the research agenda for the Qwaqwa Campus, and for the institution at large, to address the challenges that the surrounding mountain communities are faced with,” he said.

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