Protecting threatened Over-seas biodiversity

Results of the second monitoring of the treated Niaoulis!

On February 18, 2020, the GEPOG teams carried out the second monitoring follow-up on the 200 niaoulis treated in November 2019.

Seedling mat around a treated strain © Anna Stier / GEPOG

The Niaouli
The Niaouli is considered one of the most problematic invasive exotic plant species for the conservation of Guyana’s coastal savannas. Imported from Australia, this species darkens open spaces and invades savannahs. Its ability to resist fires and produce more than 20,000,000 seeds per year makes Niaouli a formidable and invasive species, threatening the Guyanese savannahs.

The protocol
In order to know the optimal management method to correctly manage this species, GEPOG carried out management tests in November 2019 on 200 individuals of Niaouli. Thus, all the trees identified were cut, annealed and treated with different herbicides. Follow-up is therefore carried out regularly to ensure the efficiency of the protocols in place. An initial inspection was carried out in December 2019.
This operation, carried out on Space Center grounds within the framework of Life BIODIV’OM, aims in 2020 to highlight the most effective methods for managing this invasive exotic species and limiting its expansion.

Second monitoring
According to the same monitoring protocol as previously, the number of shoots on the stumps and leaf cover of the crowns belonging to the ringed trees were noted and photographed.
The main result of this control is the observation for the first time of a recovery expressed by mats of seedlings under the treated trees. This phenomenon, regularly reported from other regions invaded by the species like Florida, is due to the massive release of seeds after stress.
To manage this, a master internship will work on this point using a protocol developed by Florida experts who came in 2019 to support GEPOG.