A Seasonal Study of the Microflora and Micro-Fauna of Florida Lake, Johannesburg, Transvaal

Schuurman, Johanna F. M.

doi:10.1080/00359193209518864

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…Pearsall. In South Africa, Schuurman (1932) followed plankton periodicity during 1926 -8 in a small artificial lake at Johannesburg; some of her results are replotted in Fig. 3.…”

Section: Historical Developmentmentioning

confidence: 99%

“…Florida Lake, Johannesburg, 1927: seasonal changes in relative abundance of 3 major phytoplankters, in relation to water surface temperature and rainy seasons. Constructed from data of Schuurman (1932).…”

Section: Seasonality At Higher Latitudes (20-350)mentioning

confidence: 99%

“…It is of interest to compare the earliest work by Schuurman (1932) on Florida Lake at Johannesburg (altitude 1 750 m) ( Fig. 3) with that of Gayral (1954) on two similarly elevated lakes in the Middle Atlas mountains of Morocco (Fig.…”

Section: Seasonality At Higher Latitudes (20-350)mentioning

confidence: 99%

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The seasonality of phytoplankton in African lakes

Talling

1986

Hydrobiologia

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Although some study of the subject began in 1899, wide-ranging information from African water-bodies has only become available since 1950. Important developments included the establishment of long-term centres of research, the adoption of improved methods for quantitative algal sampling, the more intensive study of environmental conditions, the beginnings of experimental testing, and the improvement of taxonomic knowledge.At higher latitudes (> 20 ) examples of pronounced algal seasonality are long-established; they are accompanied and influenced by marked changes in radiant energy income and so water temperature, and often by effects of seasonal water input. Illustrations are given from lakes in Morocco and South Africa.More generally in Africa, including the tropical belt, annual patterns of phytoplankton seasonality are usually either dominated by hydrological features (water input-output) or by hydrographic ones (watercolumn structure and circulation). Examples of both types are discussed, together with instances (e.g. L. Volta) of combined hydrological and hydrographic regulation. In both the seasonal abundance of diatoms is often distinct and complementary to that of blue-green algae, with differing relationships to vertical mixing and water retention.Horizontal variability in the seasonal cycle is especially pronounced in the larger or morphometrically subdivided lakes. Some inshore-offshore differentiation is also known to affect phytoplankton quantity (e.g. L. George) and species composition (e.g. L. Victoria). Longitudinal differentiation is common in elongate basins especially when with a massive or seasonal inflow at one end (e.g. L. Thrkana, L. Nubia, L. Volta); occasional terminal upwelling can also be influential (e.g. southern L. Tanganyika). Such examples grade into the longitudinally differentiated seasonality of flowing river-reservoir systems, as studied on the Blue and White Niles.The annual amplitude of population density, expressed in orders of magnitude logogo units), is one measure of seasonal variability. It can exceed 3 orders both in systems subject to hydrological wash-out (e.g. Nile reservoirs) and in the more variable species components of lakes of long retention (e.

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“…Pearsall. In South Africa, Schuurman (1932) followed plankton periodicity during 1926 -8 in a small artificial lake at Johannesburg; some of her results are replotted in Fig. 3.…”

Section: Historical Developmentmentioning

confidence: 99%

Section: Seasonality At Higher Latitudes (20-350)mentioning

confidence: 99%

See 1 more Smart Citation

The seasonality of phytoplankton in African lakes

Talling

1986

Hydrobiologia

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“…Their utility is determined by their construction date, while stratigraphic integrity is affected by management regimes linked to water level changes or interventions such as dredging. Some of the older, large dams in South Africa were studied as early as the 1920s and 1930s, (e.g., Hartbeespoort Dam; Allanson, 1988), while Schuurman (1932) and Weintroub (1933) described the flora and fauna of pans and dams such as Wemmer Pan, Brakpan and Florida Lake dam in Johannesburg during the 1920s. The South African national register of dams (wall height >5m) shows that large dam construction started in the 1800s, with a major acceleration in the 20 th century.…”

Section: Lacustrine Sedimentsmentioning

confidence: 99%

The chronostratigraphy of the Anthropocene in southern Africa: Current status and potential

Turner

Unger

Curtis

2021

South African Journal of Geology

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The process for the formal ratification of the proposed Anthropocene Epoch involves the identification of a globally isochronous stratigraphic signal to mark its starting point. The search for a Global Boundary Stratotype Section and Point (GSSP), a unique reference sequence that would be used to fix the start of the epoch, is in progress but none of the candidate sections are located in Africa. We assessed the currently available stratigraphic evidence for the possible markers of the Anthropocene in southern Africa and found that, although most markers have been identified in the region, the robustly dated, high resolution records required for the GSSP are very sparse. We then assessed the extent and stratigraphic resolution of a range of potential natural archives and conclude that a small number of permanent lakes, as well as marine sediments, corals and peats from selected locations in southern Africa could provide the temporal resolution required. With sufficient chronological control and multi-proxy analyses, one of these archives could provide a useful auxiliary stratotype thereby helping to confirm the global reach, and extending the utility, of the selected Anthropocene GSSP.

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“…Thus, prior to the 1930's, algal publications relating to southern Africa were almost entirely of a taxonomic nature, but increasing population and mining activity in the Transvaal with the consequent pressure on available water supplies led to some isolated investigations of a more ecological nature (Hutchinson et al, 1932;Schuurman, 1932;Weintroub, 1953). An exception to this is the publication of Harrison et al (1960), who investigated the purifying effects of a marsh lying adjacent to the polluted Klip and Klipspruit Streams, near Johannesburg.…”

Section: Introductionmentioning

confidence: 99%

Filamentous freshwater macroalgae in South Africa ? a literature review and perspective on the development and control of weed problems

Joska

Bolton

1996

Hydrobiologia

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Studies on freshwater filamentous algae have not been undertaken in South Africa for some thirty years. Early investigations were mainly of a taxonomic nature and ecological information is virtually non-existent. However, in the recent years the spread of urban settlement and increasing demand for both industrial and domestic water have highlighted the problems facing current water supplies. Irrigation systems in particular have suffered increasing interferences from filamentous algal blooms, mainly Cladophora glomerata. As nutrient loads have increased in impoundments and rivers, the presence of this alga has become more obvious, causing decreased water flow in canals and an escalation in costs associated with its control. Copper sulphate and predosing with commercial sulphuric acid to reduce pH are now the commonest control method in most of the irrigation systems. A synopsis of current conditions is presented and proposed avenues of research are discussed.

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A Seasonal Study of the Microflora and Micro-Fauna of Florida Lake, Johannesburg, Transvaal

Cited by 11 publications

References 17 publications

The seasonality of phytoplankton in African lakes

The seasonality of phytoplankton in African lakes

The chronostratigraphy of the Anthropocene in southern Africa: Current status and potential

Filamentous freshwater macroalgae in South Africa ? a literature review and perspective on the development and control of weed problems

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