2016
DOI: 10.1007/s10750-016-2939-8
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A separate lowstand lake at the northern edge of Lake Tanganyika? Evidence from phylogeographic patterns in the cichlid genus Tropheus

Abstract: In Lake Tanganyika, lake level fluctuations were shown to have had a major impact on the evolution of littoral species. Many species are subdivided into arrays of populations, geographical races and sister species, each colonizing a particular section of the shore. Their often limited dispersal abilities promoted geographic isolation and, on the long run, allopatric speciation. With more than 120 distinct populations, the genus Tropheus represents the most spectacular and best-studied example of this phenomeno… Show more

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Cited by 10 publications
(17 citation statements)
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References 67 publications
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“…During the Late Pleistocene glaciations (≈106 Ka), lake levels dropped by ≈435 m, and while the size of LT was considerably reduced, it remained a large and mostly connected water body (McGlue et al, 2008). These lake-level fluctuations have been shown to influence distributions and diversification in multiple cichlid species (e.g., Rüber, Verheyen, & Meyer, 1999;Sefc, Mattersdorfer, Hermann, & Koblmüller, 2017;Sturmbauer, Börger, van Steenberge, & Koblmüller, 2017;Verheyen, Rüber, Snoeks, & Meyer, 1996) primarily through altered habitat barriers and repeated periods of isolation followed by secondary contact (e.g., Egger, Koblmüller, Sturmbauer, & Sefc, 2007;Nevado, Mautner, Sturmbauer, & Verheyen, 2013). Lake-level rises also correlate with population expansions allowing the colonization of new habitats (Koblmüller et al, 2011;Winkelmann, Rüber, & Genner, 2017).…”
mentioning
confidence: 99%
“…During the Late Pleistocene glaciations (≈106 Ka), lake levels dropped by ≈435 m, and while the size of LT was considerably reduced, it remained a large and mostly connected water body (McGlue et al, 2008). These lake-level fluctuations have been shown to influence distributions and diversification in multiple cichlid species (e.g., Rüber, Verheyen, & Meyer, 1999;Sefc, Mattersdorfer, Hermann, & Koblmüller, 2017;Sturmbauer, Börger, van Steenberge, & Koblmüller, 2017;Verheyen, Rüber, Snoeks, & Meyer, 1996) primarily through altered habitat barriers and repeated periods of isolation followed by secondary contact (e.g., Egger, Koblmüller, Sturmbauer, & Sefc, 2007;Nevado, Mautner, Sturmbauer, & Verheyen, 2013). Lake-level rises also correlate with population expansions allowing the colonization of new habitats (Koblmüller et al, 2011;Winkelmann, Rüber, & Genner, 2017).…”
mentioning
confidence: 99%
“…Using mitochondrial and nuclear DNA sequences, they found (a) that divergence between these two species was fairly recent (approximately 100 kya) and proceeded with little if any gene flow, (b) that a geographically restricted divergent haplogroup originated from ancient introgression, and (c) that habitatinduced population fragmentation contrasts with weak phylogeographic structure, a pattern consistent with low levels of periodic gene flow mediating genetic connectivity across large geographic distances. The studies by Sturmbauer et al (2017) and Sefc et al (2017) focus on cichlids of the genus Tropheus, highly stenotopic rock-dwellers of the shallow littoral zone from the north and south of the lake, respectively. Both studies found, based on a combination of mitochondrial and nuclear markers, that the present population genetic structure is highly complex and shaped primarily by past and current habitat fragmentation and recurrent Pleistocene lake-level fluctuations.…”
Section: East African Great Lakesmentioning
confidence: 99%
“…In Sefc et al (2017), the observed pattern of unidirectional introgression across a large habitat barrier in the south of the lake is best explained by habitat changedriven population extinctions that truncated a previously symmetric admixture zone. At the opposite (northern) end of the *700-km-long lake, Sturmbauer et al (2017) related repeated introgression between genetic lineages and lake-level fluctuations.…”
Section: East African Great Lakesmentioning
confidence: 99%
“…; Sturmbauer et al . ), but show only little if any genetically determined eco‐morphological differentiation (Kerschbaumer et al . ).…”
Section: Introductionmentioning
confidence: 99%
“…In Lake Tanganyika, cichlid fish of the endemic genus Tropheus are common, highly stenotopic inhabitants of the shallow rocky littoral (typically in depths of 1-10 m). Populations display distinct genetic and colour pattern differentiation even across minor habitat barriers (Schupke 2003;Egger et al 2007;Sefc et al 2007Sefc et al , 2017Koblm€ uller et al 2011;Konings 2013;Nevado et al 2013;Sturmbauer et al 2017), but show only little if any genetically determined eco-morphological differentiation (Kerschbaumer et al 2011). The rapid genetic differentiation across small barriers, which took place since the establishment of the present high-stand shoreline following the LGM, and the absence of differentiation in the absence of barriers (Koblm€ uller et al 2011) suggest that gene flow is controlled by barriers rather than by distance.…”
Section: Introductionmentioning
confidence: 99%