Only true pelagics mix : comparative phylogeography of deepwater bathybatine cichlids from Lake Tanganyika

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http://hdl.handle.net/10138/302812

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Koblmüller , S , Zangl , L , Börger , C , Daill , D , Vanhove , M P M , Sturmbauer , C & Sefc , K M 2019 , ' Only true pelagics mix : comparative phylogeography of deepwater bathybatine cichlids from Lake Tanganyika ' , Hydrobiologia , vol. 832 , no. 1 , pp. 93-103 . https://doi.org/10.1007/s10750-018-3752-3

Title: Only true pelagics mix : comparative phylogeography of deepwater bathybatine cichlids from Lake Tanganyika
Author: Koblmüller, Stephan; Zangl, Lukas; Börger, Christine; Daill, Daniel; Vanhove, Maarten P. M.; Sturmbauer, Christian; Sefc, Kristina M.
Contributor: University of Helsinki, Finnish Museum of Natural History
Date: 2019-04
Language: eng
Number of pages: 11
Belongs to series: Hydrobiologia
ISSN: 1573-5117
URI: http://hdl.handle.net/10138/302812
Abstract: In the absence of dispersal barriers, species with great dispersal ability are expected to show little, if at all, phylogeographic structure. The East African Great Lakes and their diverse fish faunas provide opportunities to test this hypothesis in pelagic fishes, which are presumed to be highly mobile and unrestricted in their movement by physical barriers. Here, we address the link between panmixis and pelagic habitat use by comparing the phylogeographic structure among four deepwater cichlid species of the tribe Bathybatini from Lake Tanganyika. We show that the mitochondrial genealogies (based on the most variable part or the control region) of the four species are very shallow (0.8–4% intraspecific divergence across entire distribution ranges) and that all species experienced recent population growth. A lack of phylogeographic structure in the two eupelagic species, Bathybates fasciatus and B. leo, was consistent with expectations and with findings in other pelagic cichlid species. Contrary to expectations, a clear phylogeographic structure was detected in the two benthopelagic species, B. graueri and Hemibates stenosoma. Differences in genetic diversity between eupelagic and benthopelagic species may be due to differences in their dispersal propensity, mediated by their respective predatory niches, rather than precipitated by external barriers to dispersal.
Subject: 1181 Ecology, evolutionary biology
Cichlidae
Bathybates
Hemibates
Panmixis
Pelagic fishes
Phylogeography
GENETIC POPULATION-STRUCTURE
MITOCHONDRIAL-DNA ANALYSIS
BREEDING GROUNDS
TWILIGHT ZONE
FISH
EVOLUTION
DIVERGENCE
PHYLOGENY
AFRICAN
PATTERNS
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