Aspects of the biology of Tilapia mossambica Peters (Pisces: Cichlidae) in a natural freshwater lake (Lake Sibaya, South Africa)

1975 ◽  
Vol 7 (4) ◽  
pp. 423-445 ◽  
Author(s):  
M. N. Bruton ◽  
R. E. Boltt
Keyword(s):  
South Africa ◽  
Freshwater Lake ◽  
Tilapia Mossambica

An Estuarine Fauna in a Freshwater Lake in South Africa

Nature ◽  
1966 ◽  
Vol 209 (5022) ◽  
pp. 532-533 ◽  
Author(s):  
B. R. ALLANSON ◽  
B. J. HILL ◽  
R. E. BOLTT ◽  
V. SCHULTZ
Keyword(s):  
South Africa ◽  
Freshwater Lake

The growth of Tilapia mossambica Peters (Pisces: Cichlidae) in Lake Sibaya, South Africa

1974 ◽  
Vol 6 (6) ◽  
pp. 701-715 ◽  
Author(s):  
M. N. Bruton ◽  
B. R. Allanson
Keyword(s):  
South Africa ◽  
Tilapia Mossambica

Recent trends in sediment and nutrient accumulation rates in coastal, freshwater Lake Sibaya, South Africa

2013 ◽  
Vol 64 (11) ◽  
pp. 1087 ◽  
Author(s):  
Marc S. Humphries ◽  
Claudia R. Benitez-Nelson
Keyword(s):  
South Africa ◽  
Sediment Cores ◽  
Sediment Accumulation ◽  
Freshwater Lake ◽  
Total Carbon ◽  
Nutrient Concentrations ◽  
Bulk Sediment ◽  
Accumulation Rates ◽  
Nitrogen And Phosphorus ◽  
Recent Trends

Eutrophication of aquatic systems has emerged as one of the most pressing issues confronted by scientists and environmental managers. In this study, we used two sediment cores from Lake Sibaya, a coastal freshwater lake in South Africa, to infer historical variations in bulk sediment accumulation and nutrient (C, N and P) biogeochemistry. Cores were dated using 210Pb, 137Cs and 14C, and dates were used to calculate bulk sediment accumulation rates and nutrient concentrations over the last 250 years. In the western section of the lake, stratigraphic variations in total carbon, nitrogen and phosphorus increased abruptly to near-constant levels around the beginning of the 20th century, a trend that appears to be consistent with the onset of human settlement and land clearance in the catchment. In contrast, sedimentation rates have remained relatively constant over this period, despite recent land use change in the catchment. Results of this study suggest that recent increases in development pressure have yet to further influence sedimentation in Lake Sibaya, thus providing values against which future monitoring efforts can be compared. This study represents the first report on recent trends in sedimentation and nutrient biogeochemistry in Lake Sibaya. The results have broad implications for other ecologically sensitive areas within the Maputaland ecoregion of coastal southern Africa.

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

Indirect Rule in South Africa

2009 ◽  
Author(s):  
J. C. Myers
Keyword(s):  
South Africa ◽  
Indirect Rule

Combining Professional Interests and Travel: People to People Citizen Ambassador Program

2011 ◽  
Vol 1 (2) ◽  
pp. 47-54
Author(s):  
Alex Johnson ◽  
Amanda Hitchins
Keyword(s):  
South Africa ◽  
Health Education ◽  
Communication Disorders ◽  
Social Conditions ◽  
Speech Language Pathologists ◽  
Exchange Program

Abstract This article summarizes a series of trips sponsored by People to People, a professional exchange program. The trips described in this report were led by the first author of this article and include trips to South Africa, Russia, Vietnam and Cambodia, and Israel. Each of these trips included delegations of 25 to 50 speech-language pathologists and audiologists who participated in professional visits to learn of the health, education, and social conditions in each country. Additionally, opportunities to meet with communication disorders professionals, students, and persons with speech, language, or hearing disabilities were included. People to People, partnered with the American Speech-Language-Hearing Association (ASHA), provides a meaningful and interesting way to learn and travel with colleagues.

Code of best practice on HIV and pregnancy in South Africa

1998 ◽  
Vol 6 (12) ◽  
pp. 174
Keyword(s):  
South Africa ◽  
Best Practice
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