Distribution of invasive alien Tithonia (Asteraceae) species in eastern and southern Africa and the socio-ecological impacts of T. diversifolia in Zambia

Bothalia - African Biodiversity & Conservation

Field Value
Title Distribution of invasive alien Tithonia (Asteraceae) species in eastern and southern Africa and the socio-ecological impacts of T. diversifolia in Zambia
Creator Witt, Arne B.R. Shackleton, Ross T. Beale, Tim Nunda, Winnie van Wilgen, Brian W.
Subject Invasion biology; ecology Biological invasions; benefits; costs; invasive species; human well-being; livelihoods; Tithonia; weed
Description Background: Many alien plant species, such as Tithonia diversifolia, T. rotundifolia and T. tubaeformis, have been introduced to areas outside of their natural distribution range to provide benefits, but have subsequently become invasive, threatening biodiversity and agricultural productivity.Objectives: The aim of this study was to determine the current distribution and dates of introduction of invasive Tithonia species in eastern and southern Africa and to document the effects of T. diversifolia on rural livelihoods in Zambia.Method: Roadside surveys, and other sources of information, were used to determine the distribution of invasive Tithonia species in eastern and southern Africa. Household interviews were conducted to gauge perceptions and understand the impacts of T. diversifolia on local livelihoods in Zambia’s Copperbelt province.Results: Tithonia diversifolia is widespread in Uganda, Kenya, Tanzania, South Africa, Malawi and parts of Zambia but less so in Zimbabwe. Tithonia rotundifolia was comparatively uncommon in eastern Africa but common in some southern African countries, while T. tubaeformis was invasive in Swaziland, South Africa, Zambia and possibly also Zimbabwe. According to the majority of respondents in Zambia, T. diversifolia has negative impacts on native vegetation, mobility or access, water availability, crop yields and animal health.Conclusion: Invasive Tithonia species are widespread and spreading throughout much of Africa. Livelihood and biodiversity costs have not been considered by those actively promoting the use and further dissemination of T. diversifolia. We therefore recommend that detailed cost–benefit studies should be undertaken to support informed decisions on the future management of these species.
Publisher AOSIS
Contributor DST-NRF Centre of Excellence for Invasion Biology National Research Foundation Stellenbosch University DFID, ACIAR, DGIS SDC
Date 2019-01-10
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Surveys; Interviews
Format text/html application/epub+zip application/xml application/pdf
Identifier 10.4102/abc.v49i1.2356
Source Bothalia; Vol 49, No 1 (2019); 11 pages 2311-9284 0006-8241
Language eng
Relation https://journals.abcjournal.aosis.co.za/index.php/abc/article/view/2356/2570 https://journals.abcjournal.aosis.co.za/index.php/abc/article/view/2356/2569 https://journals.abcjournal.aosis.co.za/index.php/abc/article/view/2356/2571 https://journals.abcjournal.aosis.co.za/index.php/abc/article/view/2356/2568
Coverage Savanna — —
Rights Copyright (c) 2019 Arne Witt https://creativecommons.org/licenses/by/4.0