4.7 Article

Mosaic or melting pot: The use of monogeneans as a biological tag and magnifying glass to discriminate introduced populations of Nile tilapia in sub-Saharan Africa

Journal

GENOMICS
Volume 114, Issue 3, Pages -

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygeno.2022.110328

Keywords

Introduced Nile tilapia; Stocking history; Monogenean dactylogyrids; Biological tag; Magnifying glass; Mitogenomes

Funding

  1. Special Research Fund of Hasselt University [7NI02, BOF19OWB02, BOF20TT06]
  2. Research Foundation-Flanders (FWO-Vlaanderen) [1513419 N]
  3. European Marine Biological Research Centre (EMBRC) Belgium, FWO-Vlaanderen project [GOH3817N]
  4. Stichting ter Bevordering van het Biodiversiteitsonderzoek in Afrika (SBBOA) fund

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This study explored the origin of introduced Nile tilapia stocks in sub-Saharan Africa and tested the potential of monogeneans as biological tags and magnifying glasses. The results showed that dactylogyrids can be used as biological tags, and the magnifying glass hypothesis was confirmed only for certain dactylogyrid species. The study carried out a phylogeographic analysis based on the mitochondrial genomes of monogeneans, providing unprecedented diagnostic resolution.
The origin of introduced Nile tilapia stocks in sub-Saharan Africa is largely unknown. In this study, the potential of monogeneans as a biological tag and magnifying glass is tested to reveal their hosts' stocking history. The monogenean gill community of different Nile tilapia populations in sub-Saharan Africa was explored, and a phylogeographic analysis was performed based on the mitogenomes of four dactylogyrid species (Cichlidogyrus hani, C. sclerosus, C. thurstonae, and Scutogyrus longicornis). Our results encourage the use of dactylogyrids as biological tags. The magnifying glass hypothesis is only confirmed for C. thurstonae, highlighting the importance of the absence of other potential hosts as prerequisites for a parasite to act as a magnifying glass. With the data generated here, we are the first to extract mitogenomes from individual monogeneans and to perform an upscaled survey of the comparative phylogeography of several monogenean species with unprecedented diagnostic resolution.

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