The vegetation of the Boskop Dam Nature Reserve, Potchefstroom

Bredenkamp, G.J.; Bezuidenhout, H.; Joubert, H.P.R.; Naude, C.

doi:10.4102/koedoe.v37i1.323

Cited by 7 publications

(4 citation statements)

References 0 publications

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“…None of the species gained are new additions to the area. Species were either recorded in the alternate habitat in 1995 (e.g., if recorded in the 2012 woody grasslands it was present in the 1995 open grasslands) or listed in older literature of the Potchefstroom area Bredenkamp 1990, 1991;Bezuidenhout et al 1994b;Bredenkamp et al 1994;Retief and Herman 1997;, 2000. Both habitats in 1995 had 20 % rare species (recorded in a single site and habitat only).…”

Section: Vegetation Change Between 1995 and 2012mentioning

confidence: 99%

Landscape history, time lags and drivers of change: urban natural grassland remnants in Potchefstroom, South Africa

2016

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Context The history of the landscape directly affects biotic assemblages, resulting in time lags in species response to disturbances. In highly fragmented environments, this phenomenon often causes extinction debts. However, few studies have been carried out in urban settings. Objectives To determine if there are time lags in the response of temperate natural grasslands to urbanization. Does it differ for indigenous species and for species indicative of disturbance and between woody and open grasslands? Do these time lags change over time? What are the potential landscape factors driving these changes? What are the corresponding vegetation changes? Methods In 1995 and 2012 vegetation sampling was carried out in 43 urban grassland sites. We calculated six urbanization and landscape measures in a 500 m buffer area surrounding each site for 1938, 1961, 1970, 1994, 1999, 2006, and 2010. We used generalized linear models and model selection to determine which time period best predicted the contemporary species richness patterns. Results Woody grasslands showed time lags of 20-40 years. Contemporary open grassland communities were, generally, associated with more contemporary landscapes. Altitude and road network density of natural areas were the most frequent predictors of species richness. The importance of the predictors changed between the different models. Species richness, specifically, indigenous herbaceous species, declined from 1995 to 2012. Conclusions The history of urbanization affects contemporary urban vegetation assemblages. This indicates potential extinction debts, which have important consequences for biodiversity conservation planning and sustainable future scenarios.

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Section: Vegetation Change Between 1995 and 2012mentioning

confidence: 99%

Landscape history, time lags and drivers of change: urban natural grassland remnants in Potchefstroom, South Africa

2016

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“…Showing resemblance to this community is the Combretum erythrophyllum -Celtis africana Major Community described by Behr & Bredenkamp (1988) from the Witwatersrand Botanic Garden in Roodepoort and the Celtis africana -Ziziphus mucronata community (Bredenkamp 1997b) from the Fort Klapperkop area in Pretoria and the Lonehill Nature Reserve (Bredenkamp 1992). Bredenkamp (1992) conducted a more detailed assessment on the small Lonehill Nature Reserve and described more communities.…”

Section: Acacia Caffra -Rhus Pyroidesmentioning

confidence: 99%

“…Bredenkamp (1992) conducted a more detailed assessment on the small Lonehill Nature Reserve and described more communities. Bredenkamp & Brown (1998a, 1998b) described vegetation to the west and north of Johannesburg indicating resemblance to this community.…”

Section: Acacia Caffra -Rhus Pyroidesmentioning

confidence: 99%

“…Limited vegetation studies, mostly unpublished, have been done on small areas in the urban Gauteng (Behr & Bredenkamp 1988;Ellery 1992Ellery , 1994Bredenkamp 1991Bredenkamp , 1992Bredenkamp , 1997aBredenkamp , 1997bBredenkamp & Brown 1998a, 1998b. Surveys of similar natural woodland vegetation in the Gauteng Province outside urban areas, include those of Bredenkamp & Theron (1978, 1980 and Coetzee et.al.…”

Section: Introductionmentioning

confidence: 99%

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Natural woodland vegetation and plant species richness of the urban open spaces in Gauteng, South Africa

Grobler

Bredenkamp

Brown

2002

Koedoe

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It is estimated that approximately 60 % of the world's population will be living in urban areas by 2025. In Gauteng, the most densely populated province in South Africa, the natural open spaces are continually under threat from development. Vegetation is the most physical representation of the environment on which all animals are ultimately dependent. In order to evaluate an areas potential for development or conservation it is necessary to make a thorough inventory of the plant communities and their associated habitats. A survey of the natural woodlands was undertaken as part of a project describing the vegetation of the natural open spaces within the Gauteng region. Relevés were compiled in 73 stratified random sample plots in selected open spaces within the study area. A TWINSPAN classification, refined by Braun-Blanquet procedures, indicated six woodland communities that can be grouped into two major woodland communities. A classification and description of these communities as well as their species richness are presented. The results indicate that there are still patches of well-preserved natural vegetation within the study area and contribute to the limited knowledge that presently exists for the vegetation of the area.

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