JUser: :_load: Unable to load user with ID: 504


Thank you for visiting our website.

Please note that the site is not fully functional at the moment as we are in the process of re-developing. We hope that you will find the available resources helpful in the meantime.

German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

1 2 3 4 5 6 7

Environmental Programmes

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

Invasive potential of Melaleuca parvistaminea in South Africa and the need to assess invasive potential of dry-seeded Myrtaceae

Invasive potential of Melaleuca parvistaminea in South Africa and the need to assess invasive potential of dry-seeded Myrtaceae
Llewellyn Jacobs1,2,3, Dave Richardson2, John Wilson2,3
1 Scientific Services, CapeNature, Private Bag X5014, Stellenbosch, 7599
2Centre of Excellence for Invasion Biology, Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, 7602
3Invasive Species Programme, South African National Biodiversity Institute, Private Bag X7, Claremont, 7735

Melaleuca parvistaminea Byrnes (Rough-barked Honey myrtle) was first brought to SANBI's ISP attention in 2009. Here we describe the survey and management of the population (the first record of an invasion for this species in the world). As yet not all areas have been searched exhaustively. We have found over 13 000 plants spread over 372 ha (condensed canopy area of ~0.73 ha) at 3 sites between Tulbagh and Wolseley, in the Western Cape. Population structure indicates considerable spread by seed with at least 63% of plants being seedling or juvenile. Clearing and fire trigger seed release causing prolific recruitment (up to ~18 000 seedlings/m2) after winter rain. No evidence for a soil stored seed bank was found. Risk assessment shows significant invasive potential, while bioclimatic niche modelling indicates high suitability in the southern Cape region. Plants however only reproduce at 5 years or older, allowing for sustained clearing efforts before juveniles can set seed.

Initially, this serotinous reseeder was identified as Melaleuca ericifolia Sm. (Swamp paperbark), a sister taxon, but examination of morphology and reproductive characters led to revised identification, highlighting the need for taxonomic work on new detections.

Given the potential for the species to dominate wetland habitats, we propose that this species should be listed as a target for compulsory control (i.e. eradication). We estimate eradication would currently cost ~R1.6 million.

There are several other invasive melaleucas in South Africa, and we briefly discuss current management and research efforts on each. Building on this work, we propose an MSc- project looking at a detailed assessment of dry-seeded Myrtaceae—assessing the factors that determine success at each stage of invasion at a global scale; evaluating which species are present in South Africa and which pathways these are associated with; and exploring the mechanisms underlying invasiveness in the ornamental genera Melaleuca and Callistemon.

Read 4250 times

General News Updates

2019 National Symposium on Biological Invasio…


This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training


During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group


Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?


On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released


Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised


The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more