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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
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Taxonomy and ecology of the fossil freshwater molluscs from a Late Miocene palaeo-lake in the Albertine Basin (Uganda)
Musalizi, S. (2014). Taxonomy and ecology of the fossil freshwater molluscs from a Late Miocene palaeo-lake in the Albertine Basin (Uganda). MSc Thesis. Universiteit Antwerpen/Universiteit Gent/VUB: Antwerpen, Gent, Brussel. 12, 46 pp.
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| Beschikbaar in | Auteur |
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Documenttype: Doctoraat/Thesis/Eindwerk
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| Abstract |
From Late Miocene (Toronian, 8 - 9Ma) till Late Pliocene (Piacenzian, 2.5 Ma) times, a gigantic lake, Palaeolake Obweruka, extended in the Albertine Basin. This palaeolake was geomorphologically identical to Modern L. Tanganyika and in addition shares the occurrence of thallasoid (marine-like) molluscan faunas. Former research on this palaeolake revealed that evolution gave rise to 3 different thalassoid malacofauna’s, each preceded by an extinction. Over the last years fossil bearing deposits were discovered north of L. Albert, dating from the earliest lake stage (8-9 Ma), from which evidence had been missing. In the present study, the fossil molluscan assemblages from these deposits were treated. They yielded a diverse mollusk community (15 species) dominated by viviparids (Neothauma) and unionids (Coelatura), that lived in a vast but relatively shallow lake. About half of the species are new to science. Assemblages from the subsequent deeper lake stage (7 – 4.5Ma) contain species that were also found during earlier investigations in other parts of the basin. The major scientific importance of the earliest assemblages is that they consist for a large part of thalassoid endemics, new to science, representing evidence for a first thalassoid evolutionary escalation at the very onset of the lake. It is clear that the four thalassoid molluscan faunas of L. Obweruka represent rapid escalatory punctuations, each preceded by a major environmental shift and an extinction. |
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