Lake Tanganyika, East Africa, is the oldest and deepest African Great Lake and harbours one of the most diverse fish assemblages on earth. Two clupeid fishes, Limnothrissa miodon and Stolothrissa tanganicae, constitute a major part of the total fish catch, making them indispensable for local food security. Parasites have been proposed as indicators of stock structure in highly mobile pelagic hosts. We examined the monogeneans Kapentagyrus limnotrissae and Kapentagyrus tanganicanus (Dactylogyridae) infecting these clupeids to explore the parasites' lake-wide population structure and patterns of demographic history. Samples were collected at seven sites distributed across three sub-basins of the lake. Intraspecific morphological variation of the monogeneans (n = 380) was analysed using morphometrics and geomorphometrics of sclerotised structures. Genetic population structure of both parasite species (n = 246) was assessed based on a 415 bp fragment of the mitochondrial cytochrome c oxidase subunit I (COI) gene. Overall, we observed a lack of clear geographical morphological differentiation in both parasites along a north-south axis. This lack of geographical population structure was also reflected by a large proportion of shared haplotypes, and a pattern of seemingly unrestricted gene flow between populations. Significant morphological and genetic differentiation between some populations might reflect temporal differentiation rather than geographical isolation. Overall, the shallow population structure of both species of Kapentagyrus reflects the near-panmictic population structure of both host species as previously reported. Morphological differences related to host species identity of K. tanganicanus were consistent with incipient speciation at the genetic level. Both parasite species experienced a recent demographic expansion, which might be linked to paleohydrological events. Finally, interspecific hybridisation was found in Kapentagyrus, representing the first case in dactylogyrid monogeneans.

Centre de Recherche en Hydrobiologie Département de Biologie B P 73 Uvira Democratic Republic of the Congo

Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic

Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic; Hasselt University Centre for Environmental Sciences Research Group Zoology Biodiversity and Toxicology Agoralaan Gebouw D B 3590 Diepenbeek Belgium; Laboratory of Biodiversity and Evolutionary Genomics Department of Biology KU Leuven Ch Deberiotstraat 32 B 3000 Leuven Belgium

Department of Botany and Zoology Faculty of Science Masaryk University Kotlářská 2 611 37 Brno Czech Republic; Hasselt University Centre for Environmental Sciences Research Group Zoology Biodiversity and Toxicology Agoralaan Gebouw D B 3590 Diepenbeek Belgium; Laboratory of Biodiversity and Evolutionary Genomics Department of Biology KU Leuven Ch Deberiotstraat 32 B 3000 Leuven Belgium; Zoology Unit Finnish Museum of Natural History University of Helsinki P O Box 17 Helsinki FI 00014 Finland

Faculty of Biosciences and Aquaculture Nord University N 8049 Bodø Norway

Faculty of Sciences University of Burundi PO Box 2700 Bujumbura Burundi

Hasselt University Centre for Environmental Sciences Research Group Zoology Biodiversity and Toxicology Agoralaan Gebouw D B 3590 Diepenbeek Belgium

Institute of Biology University of Graz Universitätsplatz 2 A 8010 Graz Austria

Laboratory of Biodiversity and Evolutionary Genomics Department of Biology KU Leuven Ch Deberiotstraat 32 B 3000 Leuven Belgium

Laboratory of Biodiversity and Evolutionary Genomics Department of Biology KU Leuven Ch Deberiotstraat 32 B 3000 Leuven Belgium; Capacities for Biodiversity and Sustainable Development Operational Directorate Natural Environment Royal Belgian Institute of Natural Sciences Vautierstraat 29 B 1000 Brussels Belgium

Laboratory of Biodiversity and Evolutionary Genomics Department of Biology KU Leuven Ch Deberiotstraat 32 B 3000 Leuven Belgium; Institute of Biology University of Graz Universitätsplatz 2 A 8010 Graz Austria; Operational Directorate Taxonomy and Phylogeny Royal Belgian Institute of Natural Sciences Vautierstraat 29 B 1000 Brussels Belgium; Biology Department Royal Museum for Central Africa Leuvensesteenweg 13 B 3080 Tervuren Belgium

Citace poskytuje Crossref.org

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