Journal article

Publication year: 2009

Pages: 2837-2846

Journal: Proceedings of the Royal Society B: Biological Sciences

Volume number: 276

Issue number: 1668

ISSN: 0962-8452

Open access status: Green

DOI Link: https://doi.org/10.1098/rspb.2009.0467

Publisher: The Royal Society

Abstract: 
Studies on environmental changes provide important insights into modes of speciation, into the (adaptive) reoccupation of ecological niches and into species turnover. Against this background, we here examine the history of the gastropod genus Lanistes in the African Rift Lake Malawi, guided by four general evolutionary scenarios, and compare it with patterns reported from other endemic Malawian rift taxa. Based on an integrated approach using a mitochondrial DNA phylogeny and a trait-specific molecular clock in combination with insights from the fossil record and palaeoenvironmental data, we demonstrate that the accumulation of extant molecular diversity in the endemic group did not start before approximately 600 000 years ago from a single lineage. Fossils of the genus from the Malawi Rift, however, are over one million years older. We argue that severe drops in the lake level of Lake Malawi in the Pleistocene offer a potential explanation for this pattern. Our results also challenge previously established phylogenetic relationships within the genus by revealing parallel evolution and providing evidence that the endemic Lanistes species are not restricted to the lake proper but are present throughout the Malawi Rift.

Harvard Citation style: Schultheiß, R., Van Bocxlaer, B., Wilke, T. and Albrecht, C. (2009) Old fossils - young species: evolutionary history of an endemic gastropod assemblage in Lake Malawi, Proceedings of the Royal Society B: Biological Sciences, 276(1668), pp. 2837-2846. https://doi.org/10.1098/rspb.2009.0467

APA Citation style: Schultheiß, R., Van Bocxlaer, B., Wilke, T., & Albrecht, C. (2009). Old fossils - young species: evolutionary history of an endemic gastropod assemblage in Lake Malawi. Proceedings of the Royal Society B: Biological Sciences. 276(1668), 2837-2846. https://doi.org/10.1098/rspb.2009.0467