coaltech upper olifants river catchment wetland inventory ...

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The databases were combined into a single layer and then split into a wetland database and dam layer. Verification of the wetland database and dam layer were done by comparing the layers to the 1:50 000 topographical maps and then the georeferenced aerial photographs of the site. Field verification of the wetlands was undertaken from July to October 2006, and the database was updated accordingly. The entire wetland database was reviewed against the aerial photographs after conducting the field verification site visits. The attributes included in the wetland database were derived from the aerial photographs, as well as existing data and observations during the field verification site visits. Characteristics of the wetlands and surrounding areas that are visible on the aerial photographs were taken into account. Where wetlands were included in the field verification the attributes as observed on site were included. The following fields were included in the wetland attribute table: • Type • Threats • Connectivity • Status • Red Data species • Important species • Functions • Bird number • Observed Red Data species • Observed important species • Dominant vegetation Results and Discussion Wetlands and dams in the UORC were delineated based on the aerial photographs. Field verification of the wetlands took place from July 2006 to October 2006. Due to the large extent of the catchment and wetlands occurring on private properties, not all wetlands were surveyed during the field verification. Wetland Database for UORC - 4 -
The most common wetland types in the catchment are seepage and non-floodplain riparian wetlands with approximately 34% of the total wetland area falling into each of these wetland types. The floodplain riparian wetlands comprise 28 % of the total wetland area. The riparian wetlands (floodplain riparian and non-floodplain riparian combined) are, therefore, the largest percentage contribution to wetlands in total. Although numerous pans occur in the catchment the pans only cover a small area of the total area. The non-perennial and perennial pans comprise 2.5 % and 1.5 % of the total wetland area of the catchment, respectively. Less than 0.2 % of the total wetland area has been classified as artificial wetlands. Comparison to the National Landcover wetland layer The final Landcover wetland layer, completed in June 2006, was compared to the completed UORC wetland database. The Landcover wetland layer compared very well to the UORC wetland database, since all of the Landcover wetlands were located in the areas already indicated as wetlands in the UORC wetland database. The UORC wetland database has more extensive wetland areas, probably as a result of the differences in scale of the studies. The National Landcover wetland layer has a total wetland area of 16 303ha, whereas the UORC wetland database has a total wetland area of 214 731ha. The National Landcover wetland layer therefore only covers 1% of the total catchment area and 7.6% of the total wetland area indicated in the UORC wetland database. It seems as if the Landcover layer includes the seasonal and permanent zones of some of the wetlands and not all the temporary zones. Areas of open water in the wetlands are also excluded from the Landcover layer. The pans are poorly represented, possibly because they contain areas of open water, and were identified as such. Wetland Database for UORC - 5 -
Page 1 and 2: COALTECH UPPER OLIFANTS RIVER CATCH
Page 3: The following aspects are included
Page 7 and 8: The attributes allocated based on t
Page 9 and 10: 6. DATABASE CONSTRAINTS............
Page 11 and 12: Addendums Addendum A - Plant specie
Page 13 and 14: Figure 1. Extent of the UORC (refer
Page 15 and 16: The aim of the wetland layer is to
Page 17 and 18: 3.3 Wetland biodiversity Wetlands p
Page 19 and 20: Table 1: Species of concern Species
Page 21 and 22: Species name Common name Hottentot
Page 23 and 24: Species name Common name Cordylus g
Page 25 and 26: 3.3.2 Birds Various bird species ut
Page 27 and 28: 3.3.6 Fish The UORC has a low diver
Page 29 and 30: Figure 2. Schematic illustration of
Page 31 and 32: 3.4.1.2 Floodplain riparian Floodpl
Page 33 and 34: 3.4.4 Other non-riparian wetlands O
Page 35 and 36: 3.5.1.2 Groundwater recharge Variou
Page 37 and 38: More important in the removal of me
Page 39 and 40: The flow velocity in the channel of
Page 41 and 42: The most important fishing activity
Page 43 and 44: 3.5.6.3 Livestock Diseases Various
Page 45 and 46: 3.6.2 Mining and Quarrying There is
Page 47 and 48: • Dwars-in-die-wegspruit at the l
Page 49 and 50: 3.6.4 Burning Wetlands are burnt on
Page 51 and 52: 3.6.9 Alien Fauna and Flora 3.6.9.1
Page 53 and 54: Category 3 plant invaders are plant
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o The Fish Assemblage Integrity Ind
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Figure 4. The ecoregions of the Oli
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Sixteen fish species (four of which
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Figure 5. Extent of the UORC accord
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3.9 Common wetland types in UORC Ac
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In a wetland assessment conducted a
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In a wetland study at Douglas Colli
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Figure 8. Status of assessed wetlan
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Figure 9. Portion of the wetland la
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Figure 11. Portion of the water bod
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Figure 13. Portion of the separated
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Figure 15. Portion of the wetland l
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Since the field verification site v
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Figure 18. Portion of the final wet
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Upon a request from DWAF the status
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5.8 Functions The functions likely
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5.11 Wetland types The entire catch
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6. DATABASE CONSTRAINTS The greates
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Figure 21. The wetland in the UORC
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8.2 Mapping o Small wetlands (of le
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The attributes in the attribute tab
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10. REFERENCES Abbott Grobicki (Pty
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Goudie, A.S. & Thomas, D.S.G. 1985.
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Merot, P., Squividant, H., Aurousse
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Wilson, R.T. 2003. Animal health an
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Addendum A - Plan species list Wetl
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var. lachnantha Lamiaceae Ajuga oph
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Asteraceae Berkheya onopordifolia B
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Poaceae Chloris pycnothrix Chloroph
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Poaceae Boraginaceae incompletus Cy
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Poaceae Echinochloa cruspavonis * *
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Asteraceae Gamochaeta subfalcata Y
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Sterculiaceae Sterculiaceae Poaceae
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Cyperaceae Kyllinga erecta Kyllinga
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Asteraceae Nidorella anamola Nympho
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Polygonaceae Apiaceae Poaceae Apiac
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Brassicaceae Rorippa nudiuscula * *
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Poaceae Setaria verticillata * Malv
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Asteraceae Ursinia nana * * * Lenti
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Addendum B - Mammal species list We
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Cynictis Yellow Carnivora penicilla
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Addendum C - Bird species list Wetl
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Actitis hypoleucos Actophilornis Co
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Ceryle rudis Nectarinia Pied Kingfi
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Eremopterix verticalis Estrilda ast
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Netta erythrophthalma Numida meleag
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Spizocorys conirostris Pinkbilled L
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Addendum D - Reptile species list W
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Elapidae Naja haje Egyptian cobra X
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Group Species name Common name Pipi
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Addendum F - Fish species list Wetl
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Austroglansis sclateri X X Barbus a
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Phylum Group Species name Common na
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Arachnida Tanycypris obtusa Hydroze
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gibba Daphnia pulex Simocephalus ca
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Ischnura senegalensis Pseuddgrion s
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Micronecta sp. Micronecta piccanin
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Hydraenidae Hydrophilida e Berosus
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MOLLUSCA Simulium adersi Simulium ?
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