Tufa stromatolite ecosystems on the South African south coast

Perissonotto, Renzo; Bornman, Tommy G; Steyn, Paul-Pierre; Miranda, Nelson A F; Dorrington, Rosemary A; Matcher, Gwynneth F; Strydom, Nadine A; Peer, Nasreen

Title: Tufa stromatolite ecosystems on the South African south coast
Creator: Perissonotto, Renzo
Creator: Bornman, Tommy G
Creator: Steyn, Paul-Pierre
Creator: Miranda, Nelson A F
Creator: Dorrington, Rosemary A
Creator: Matcher, Gwynneth F
Creator: Strydom, Nadine A
Creator: Peer, Nasreen
Date Issued: 2014
Date: 2014
Type: Article
Identifier: vital:6490
Identifier: http://hdl.handle.net/10962/d1014585
Identifier: http://dx.doi.org/10.1590/sajs.2014/20140011
Description: Following the first description of living marine stromatolites along the South African east coast, new investigations along the south coast have revealed the occurrence of extensive fields of actively calcifying stromatolites. These stromatolites have been recorded at regular distances along a 200-km stretch of coastline, from Cape Recife in the east to the Storms River mouth in the west, with the highest density found between Schoenmakerskop and the Maitland River mouth. All active stromatolites are associated with freshwater seepage streams flowing from the dune cordon, which form rimstone dams and other accretions capable of retaining water in the supratidal platform. Resulting pools can reach a maximum depth of about 1 m and constitute a unique ecosystem in which freshwater and marine organisms alternate their dominance in response to vertical mixing and the balance between freshwater versus marine inflow. Although the factors controlling stromatolite growth are yet to be determined, nitrogen appears to be supplied mainly via the dune seeps. The epibenthic algal community within stromatolite pools is generally co-dominated by cyanobacteria and chlorophytes, with minimal diatom contribution.
Format: 8 pages
Format: pdf
Language: English
Relation: Perissinotto, R. et al., 2014. Tufa stromatolite ecosystems on the South African south coast. South African Journal of Science, 110(9/10), pp.1–8. Available at: http://dx.doi.org/10.1590/sajs.2014/20140011

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Dorrington, Rosemary A (Prof)

Matcher, Gwynneth (Dr)

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