Tertiary Sea-Level Movements around Southern Africa

Siesser, William G.; Dingle, R. V.

doi:10.1086/628618

Cited by 48 publications

(44 citation statements)

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“…Our most recent surveys and results from the surveys done by Russell & Impson (2006), however, suggest that populations of this lineage survive in the Grashoek, Kars and Nuwejaars catchments of the Heuningnes River system, where they have been recorded before (Barnard, 1943;Skelton, 1988). Divergence time estimates suggest that the split of the Tradou lineage from the Heuningnes and Breede lineages occurred during the late Pliocene-early Pleistocene, a period characterised by elevated sea levels in southern Africa (Siesser & Dingle, 1981). Marine incursions during this period could have facilitated fragmentation of river systems (Fig.…”

Section: Historical Causes Of Genetic Differentiationmentioning

confidence: 99%

“…de Bruyn et al, 2004;Wong et al, 2004). Southern Africa experienced major sea-level fluctuations throughout the Tertiary Period (Siesser & Dingle, 1981). The last major transgression occurred during the middle Miocene and lasted until the late Pliocene when sea levels ranged from ?200 m to over ?300 m along the south coast of South Africa (Butzer & Helgren, 1972;Siesser & Dingle, 1981).…”

Section: Introductionmentioning

confidence: 99%

“…Southern Africa experienced major sea-level fluctuations throughout the Tertiary Period (Siesser & Dingle, 1981). The last major transgression occurred during the middle Miocene and lasted until the late Pliocene when sea levels ranged from ?200 m to over ?300 m along the south coast of South Africa (Butzer & Helgren, 1972;Siesser & Dingle, 1981). During this time, lowland areas and smaller river systems would have drowned, while larger river systems would have been severely fragmented ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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The genetic legacy of lower sea levels: does the confluence of rivers during the last glacial maximum explain the contemporary distribution of a primary freshwater fish (Pseudobarbus burchelli, Cyprinidae) across isolated river systems?

et al. 2013

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The primary freshwater fish Pseudobarbus burchelli (Smith 1841) occurs across four presently isolated river systems in the south-western cape floristic region of South Africa. Mitochondrial DNA cytochrome b (701 base pairs) and control region (601 base pairs) genes were sequenced to assess the evolutionary history of P. burchelli and evaluate the role of climatic and landscape changes in shaping patterns of genetic variation in this species. We identified three historically isolated lineages in P. burchelli: a widespread lineage that occurs across three isolated river systems and two geographically restricted lineages. The results were evaluated against predictions of the confluence of river systems during low sea levels of the last glacial maximum. Occurrence of the widespread Breede lineage in the Duiwenhoks River system is consistent with reconstructed palaeoriver systems. However, the occurrence of this lineage in the Goukou river system that formed part of the eastern Gourits-Goukou palaeoriver system can only be explained by translocation or a recent river capture or episodic inundation of low drainage divides. Extreme ecological gradients or the potential presence of instream physical barriers could have prevented an exchange of lineages between the Breede and Heuningnes river systems.

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Section: Historical Causes Of Genetic Differentiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The genetic legacy of lower sea levels: does the confluence of rivers during the last glacial maximum explain the contemporary distribution of a primary freshwater fish (Pseudobarbus burchelli, Cyprinidae) across isolated river systems?

et al. 2013

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“…A major Neogene transgression began in the middle Miocene and probably reached its greatest extent in the late Miocene or early Pliocene (Siesser and Dingle, 1981). This relative rise in sea level could explain the pelagic deposits of unit SCB-2 as well its prograding shape.…”

Section: Sea Level Risementioning

confidence: 96%

“…Another reason for a high impedance contrast can be the input of different material because of erosion caused by sea level fluctuations or continental uplift. Relative sea level dropped briefly during the middle Eocene, followed by a major regression during the Oligocene and early Miocene (Siesser and Dingle, 1981). In addition, significant uplift of South Africa occurred during the Cenozoic (e.g., Partridge and Maud, 1987).…”

Section: Unit Scb-4mentioning

confidence: 99%

Sediment deposits in the Cape Basin: Indications for shifting ocean currents?

Weigelt¹,

Uenzelmann-Neben²

2004

Bulletin

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Historical abiotic events or human‐aided dispersal: inferring the evolutionary history of a newly discovered galaxiid fish

Chakona

Swartz

Chakona

2015

Ecology and Evolution

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Range expansion of obligate freshwater fishes in the Cape Floristic Region (CFR) of South Africa has mostly been attributed to river capture events and confluence of rivers following sea-level regression. The role of low drainage divides and interbasin water transfers has received less attention. This study analyzed mitochondrial and nuclear DNA sequences to assess the processes that could have influenced the phylogeographic patterns of a newly discovered lineage of Galaxias zebratus (hereafter Galaxias zebratus “Joubertina”) that occurs across two currently isolated river systems close to the Joubertina area in the eastern CFR. Results from both analyses revealed that observed genetic differentiation cannot be explained by isolation between the two river systems. No genetic differentiation was found between the Krom River system and a population from one of the Gamtoos tributaries. Shallow genetic differentiation was found between the Krom and the other Gamtoos populations. Historical river capture events and sea-level changes do not explain the present distribution of Galaxias zebratus “Joubertina” across the Krom and Gamtoos River systems. Interbasin dispersal during pluvial periods, recent river capture, or recent human-mediated translocation seems to be the most plausible explanations.

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Tertiary Sea-Level Movements around Southern Africa

Cited by 48 publications

References 0 publications

The genetic legacy of lower sea levels: does the confluence of rivers during the last glacial maximum explain the contemporary distribution of a primary freshwater fish (Pseudobarbus burchelli, Cyprinidae) across isolated river systems?

The genetic legacy of lower sea levels: does the confluence of rivers during the last glacial maximum explain the contemporary distribution of a primary freshwater fish (Pseudobarbus burchelli, Cyprinidae) across isolated river systems?

Sediment deposits in the Cape Basin: Indications for shifting ocean currents?

Historical abiotic events or human‐aided dispersal: inferring the evolutionary history of a newly discovered galaxiid fish

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