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Morphological and Genetic Divergence in a Gill Monogenean Parasitizing Distant Cichlid Lineages of Lake Tanganyika: Cichlidogyrus nshomboi (Monogenea: Dactylogyridae) from Representatives of Boulengerochromini and Perissodini

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Abstract

As hosts constitute the resource for parasites, an adaptive radiation in a host can drive one in a parasite. In Lake Tanganyika, the diversification of cichlids has often led to a diversification of their Cichlidogyrus monogeneans. Hitherto, Cichlidogyrus nshomboi was known only from Boulengerochromis microlepis, the sole member of Boulengerochromini. Surprisingly, we retrieved this monogenean from Perissodus microlepis, P. straeleni and Haplotaxodon microlepis, belonging to Perissodini. We sequenced the nuclear 18S, 28S, ITS1 rDNA, and the mitochondrial COI genes and studied the morphology of the male copulatory organ (MCO) and the anchors of the attachment organ. This confirmed the conspecificity of the specimens. The occurrence of C. nshomboi on unrelated host lineages could be explained by inheritance from a common ancestor, or by host-switching. We further investigated the genetic and morphological variation across taxonomic (host tribes and species) and geographical scales. Results revealed divergence in ITS1 and COI between parasites infecting different tribes, which could indicate incipient speciation. Additionally, morphological differentiation in the shape and size of anchors was found between these groups, which could be attributed to phenotypic plasticity or to adaptation. Monogeneans from large-bodied B. microlepis had significantly larger anchors, whereas only two of the four measurements differed for the MCO. Unexpectedly, no morphological variation was observed between specimens infecting different species of Perissodini from nearby localities. However, differences were found between C. nshomboi infecting P. microlepis from different parts of the lake, which could be linked to the population genetic structure of the host.

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Data Availability

Genetic sequence data is publicly available from the NCBI database or from the author upon request. The voucher specimens of monogeneans are housed in the Royal Museum for Central Africa (RMCA, Belgium) (see ‘Materials and Methods’ for details on repositories and accession numbers).

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Acknowledgements

The authors are grateful to C. Sturmbauer and S. Koblmüller (University of Graz, Austria), W. Salzburger (University of Basel, Switzerland), D. Muzumani Risasi (CRH-Uvira, DR Congo) for their precious help with cichlid collection and identification; M. Reichard and R. Blažek (Czech Academy of Sciences, Czech Republic) for their help with fish collection, dissection and providing us the photographs of cichlid species during the field trip; A. Meyer (University of Konstanz, Germany), G. Banyankimbona (University of Burundi), the Schreyen-Brichard family (Fishes of Burundi) and T. Veall and O.R. Mangwangwa (Rift Valley Tropicals) for the sample collection and fish identification; P. Masilya Mulungula, T. Mulimbwa N’sibula, V. Lumami Kapepula, E. Bahane Byaragi, S. Kambale Mukeranya and F. Muterezi Bukinga (CRH-Uvira, DR Congo) for co-organising the field work and their scientific contribution on Tanganyikan cichlids; Š. Mašová, V. Michálková, E. Řehulková, I. Přikrylová, L. Raisingerová, N. Kmentová, K. Civáňová, E. Jirounková, K. Koukalová, and M. Seifertová (Masaryk University, Brno, Czech Republic) for their help with fish dissection, parasite isolation and fixation and genetics. Finally, the authors would like to thank E. Verheyen, T. Backeljau, and all the colleagues working at the Royal Belgian Institute of Natural Sciences (RBINS, Brussels), M. Parrent from the Royal Museum for Central Africa (RMCA, Tervuren), T. Artois and his team (Hasselt University, Diepenbeek, Belgium) for their kind hospitality and for the precious help they provided during the stay in Belgium. This research was funded by the Czech Science Foundation Project No. P505/12/G112—European Centre of Ichtyoparasitology (ECIP) and further supported by standard project GA19-13573S (to M.V.S. and M.P.M.V.) and the Special Research Fund of Hasselt University (BOF20TT06, to M.P.M.V.). Fieldwork was partly supported by the Research Foundation—Flanders (FWO-Vlaanderen) (travel grants V.4.096.10.N.01 and K.2.032.08.N.01 to M.P.M.V., Research Programme G.0553.10) and two travel grants from the King Leopold III Fund for Nature Conservation and Exploration (to M.P.M.V. and M.V.S.). Sampling happened in accordance with research Permit No. 2007-258-CC-2006-151 from the Tanzania Commission for Science and Technology (COSTECH), and Mission Statement No. 013/MNRST/CRHU/2010 from the Ministère de la Recherche Scientifique et Technologique–CRH-Uvira. The funders had no role in study design, data collection and analyses, decision to publish, or preparation of the manuscript.

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CR, MVS, MPMV and AŠ designed the study. MVS, MPMV and AŠ supervised the work. MPMV co-organised the fieldtrips, parasite collection, preparation of specimens and provided scientific background in the field. CR performed the lab work and data analysis, CR and MVS wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Chahrazed Rahmouni.

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Rahmouni, C., Vanhove, M.P.M., Šimková, A. et al. Morphological and Genetic Divergence in a Gill Monogenean Parasitizing Distant Cichlid Lineages of Lake Tanganyika: Cichlidogyrus nshomboi (Monogenea: Dactylogyridae) from Representatives of Boulengerochromini and Perissodini. Evol Biol 49, 221–238 (2022). https://doi.org/10.1007/s11692-022-09564-2

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