Search this journal:     Advanced search
Original Research

Developing thresholds of potential concern for invasive alien species: Hypotheses and concepts

Llewellyn C. Foxcroft

Koedoe; Vol 51, No 1 (2009), 6 pages. doi: 10.4102/koedoe.v51i1.157

Submitted: 04 June 2008
Published:  26 March 2009


The Kruger National Park (KNP) has developed and refined a system of management called ‘strategic adaptive management’ (SAM), which rests on the concept of ‘threshold of potential concern’ (TPC). TPCs represent end-points in a continuum of change. When thresholds are reached – at which point concerns of negative impacts on biodiversity are raised – management options are explicitly considered and implemented. This paper describes the TPCs developed for monitoring and managing invasive alien species (IAS). More importantly, however, it describes the conceptual understanding, principles and hypotheses adopted as the foundations for setting these TPCs. In accordance with adaptive management practices, the TPCs will be revised as the ecological and conceptual understanding of invasions grows and information is gained through research in the KNP and elsewhere.

Conservation implication: In accepting that species and systems are variable, and that flux is inevitable and desirable, these TPCs developed for invasive alien species specifi cally, provide end points against which monitoring can be assessed. Once a threshold is reached, the cause of the threshold being exceeded is examined and management interventions recommended.

Full Text:  |  PDF  |  Table 2 (606KB)

Author affiliations

Llewellyn C. Foxcroft, South African National Parks, South Africa


adaptive management; control; exotic species; objectives hierarchy


Total abstract views: 3202
Total article views: 5471  


1. A critical assessment of adaptive ecosystem management in a large savanna protected area in South Africa
B.W. van Wilgen, H.C. Biggs
Biological Conservation  vol: 144  issue: 4  first page: 1179  year: 2011  
doi: 10.1016/j.biocon.2010.05.006

Comments on this article

Before posting your comment, please read our policy.
Post a Comment (Login required)

ISSN: 0075-6458 (print) | ISSN: 2071-0771 (online)

Connect on: Facebook, Twitter, Google+, LinkedIn and YouTube

Subscribe to our newsletter

All articles published in this journal are licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license, unless otherwise stated.

Website design & content: ©2017 AOSIS (Pty) Ltd. All rights reserved. No unauthorised duplication allowed.

AOSIS Publishing | Empowering Africa through access to knowledge
Postnet Suite #110, Private Bag X19, Durbanville, South Africa, 7551Tel: 086 1000 381 Tel: +27 21 975 2602 Fax: 086 5004 974

publishing(AT) replace (AT) with @

Please read the privacy statement.