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Towards assessing impacts of alien plant infestations on river systems in the Southern Cape using cost-benefit analyses
Expanded Title:The rivers in the Garden Route Initiative area of southern Cape are characterised by relatively similar thermal regimes, and by extension all likely to exhibit similar thermal changes in response to global climate change. However, the same species across different rivers exhibit different thermal tolerances, such that ecological responses are likely to differ between rivers. The site-specific densities of alien riparian vegetation appear to have less of an impact on river ecology than major natural land cover types – fynbos forest. Site-specific levels of alien riparian vegetation density is likely to act as a surrogate for overall upstream catchment transformation, and this is reflected in exceedances of biological thresholds based on mean daily water temperatures. Based on the findings of this study, there is promise towards developing cost-benefit models incorporating targets for thermal reference conditions. This is a key step towards prioritizing areas for clearing of alien invasive vegetation. These findings could be applied not only in the study area, but also at a national scale
Date Published:01/04/2015
Document Type:Research Report
Document Subjects:Ecosystem - Biodiversity protection
Document Keywords:Guidelines, Policy and regulation
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2264/1/15
ISBN No:978-1-4312-0661-2
Authors:Rivers-moore N; Dallas H
Project No:K5/2264
Originator:WRC
Organizations:The Freshwater Research Centre; Nelson Mandela Metropolitan University
Document Size:2 862 KB
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