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Rate and pattern of bush encroachment in Eastern Cape savanna and grassland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T.G. O'Connor V.R.T. CrowThe rate and pattern of bush encroachment in the grasslands and savannas of the Kei Road-Komga region of the Eastern Cape were quantified by analysis of nine sets of aerial photographs taken between 1937 and 1986. Woody cover increased from... -
Soil erosion in the Herschel district of South Africa: changes over time, physical correlates and land users' perceptions
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: S VetterSoil erosion in rangelands is widely believed to be caused primarily by overgrazing. The aims of this study, conducted in a severely eroded district under communal tenure, were to establish (1) how the extent and severity of soil erosion have... -
Dynamics of woody vegetation in a semi-arid savanna, with a focus on bush encroachment
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M-L Britz D WardIncreases in the tree: grass ratio with accompanying changes in herbaceous composition, called bush or shrub encroachment, is a worldwide phenomenon in savanna regions. Although heavy grazing by livestock is often believed to be the cause, it is clear that... -
A century of woody plant encroachment in the dry Kimberley savanna of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: David Ward --- School of Life Sciences, South Africa M Timm Hoffman --- Plant Conservation Unit, Botany Department, South Africa Sarah J Collocott --- School of Life Sciences, South AfricaWoody plant encroachment is frequent in dry savannas. Grazing is often considered to be a major cause of encroachment in dry savannas because grasses are removed by livestock, leaving bare areas for trees to colonise in wetter years. Earlier experiments... -
Could the elongate yellow-orange nostrils of Anguilla bicolor McClelland, 1844 function as fishing lures?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Tweddle --- South African Institute for Aquatic Biodiversity, South Africa PH Skelton --- South African Institute for Aquatic Biodiversity, South AfricaThe shortfin eel Anguilla bicolor has elongate, yellow nostrils tipped with orange that protrude forward above the mouth. They are a striking, highly visible feature and it is hypothesised that they function as lures to attract prey, analogous to the... -
Using action cameras to estimate the abundance and habitat use of threatened fish in clear headwater streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Hannweg --- , South Africa SM Marr --- , South Africa LE Bloy --- , South Africa OLF Weyl --- , South AfricaSnorkel and electrofishing surveys are the traditional baseline methods for fish surveys in clear headwater streams. However, action cameras provide a non-harmful alternative to monitor freshwater fish populations to develop informed conservation management initiatives. In this paper, estimates from photographs...