Water quality and faunal studies in the Umzimvubu catchment, Eastern Cape, with particular emphasis on species as indicators of environmental change
- Madikizela, B R, Dye, Arthur H, O'Keeffe, Jay H
- Authors: Madikizela, B R , Dye, Arthur H , O'Keeffe, Jay H
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , report
- Identifier: http://hdl.handle.net/10962/437730 , vital:73405 , ISBN 1 86845 705 2 , https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/716-1-01.pdf
- Description: The primary aim of the project was to establish a water quality database and an in-ventory of aquatic fauna for the Umzimvubu River and its four main tributaries. The identification of species that are sensitive to environmental threats and that might be used as future indicators of environmental change, was the secondary aim. The results are outlined in Chapters 2, 3 and 4, while Chapter 5 reflects on conclusions and recommendations for further research. Based on the water quality data in Chapter 2 and macro-invertebrate scores (SASS4 and ASPT) in Chapter 3, the quality of water is good, suggesting that the catchment is not significantly degraded, ex-cept threats by soil erosion (Fig.2.15) leading to very high TSS loads (see Appendices 1- 3).
- Full Text:
- Date Issued: 2001
- Authors: Madikizela, B R , Dye, Arthur H , O'Keeffe, Jay H
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , report
- Identifier: http://hdl.handle.net/10962/437730 , vital:73405 , ISBN 1 86845 705 2 , https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/716-1-01.pdf
- Description: The primary aim of the project was to establish a water quality database and an in-ventory of aquatic fauna for the Umzimvubu River and its four main tributaries. The identification of species that are sensitive to environmental threats and that might be used as future indicators of environmental change, was the secondary aim. The results are outlined in Chapters 2, 3 and 4, while Chapter 5 reflects on conclusions and recommendations for further research. Based on the water quality data in Chapter 2 and macro-invertebrate scores (SASS4 and ASPT) in Chapter 3, the quality of water is good, suggesting that the catchment is not significantly degraded, ex-cept threats by soil erosion (Fig.2.15) leading to very high TSS loads (see Appendices 1- 3).
- Full Text:
- Date Issued: 2001
Spatial and temporal variability in recruitment of intertidal mussels around the coast of southern Africa
- Harris, Jean M, Branch, George M, Elliot, Bridget L, Currie, Bronwen, Dye, Arthur H, McQuaid, Christopher D, Tomalin, Bruce J, Velasquez, Claudio
- Authors: Harris, Jean M , Branch, George M , Elliot, Bridget L , Currie, Bronwen , Dye, Arthur H , McQuaid, Christopher D , Tomalin, Bruce J , Velasquez, Claudio
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447579 , vital:74658 , https://www.ajol.info/index.php/az/article/view/154717
- Description: Intensity of intertidal mussel recruitment was compared across a range of different spatial and temporal scales around the coast of southern Africa between June 1995 and October 1996. Comparison of the east and west coasts revealed significantly higher recruit densities on the west coast, corresponding to larger adult densities. This difference between the two coasts reflects biogeographic disparities in mussel species composition, growth rates and spawning intensities, oceanographic conditions and productivity. Significant spatial variations in recruitment were recorded between regions 100–1000 km apart and between localities 1–25 km apart. Results suggest that the influence of dispersal processes on recruitment patterns acts at a relatively small scale, and may affect the distribution and abundance of adults among shores only a few kilometres apart.
- Full Text:
- Date Issued: 1998
- Authors: Harris, Jean M , Branch, George M , Elliot, Bridget L , Currie, Bronwen , Dye, Arthur H , McQuaid, Christopher D , Tomalin, Bruce J , Velasquez, Claudio
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447579 , vital:74658 , https://www.ajol.info/index.php/az/article/view/154717
- Description: Intensity of intertidal mussel recruitment was compared across a range of different spatial and temporal scales around the coast of southern Africa between June 1995 and October 1996. Comparison of the east and west coasts revealed significantly higher recruit densities on the west coast, corresponding to larger adult densities. This difference between the two coasts reflects biogeographic disparities in mussel species composition, growth rates and spawning intensities, oceanographic conditions and productivity. Significant spatial variations in recruitment were recorded between regions 100–1000 km apart and between localities 1–25 km apart. Results suggest that the influence of dispersal processes on recruitment patterns acts at a relatively small scale, and may affect the distribution and abundance of adults among shores only a few kilometres apart.
- Full Text:
- Date Issued: 1998
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