Abstract
Dicyemida is a group of small-bodied marine parasites infecting cephalopods with many unknown life history details, such as their population structure and diversity, and their relation to sexual and asexual reproductive stages. To reveal (infra)population structure of Dicyema moschatum Whitman, 1883 in its host (Eledone moschata Lamarck, 1798), we isolated microsatellite sequences from a draft genome of D. moschatum and tested the loci for amplification success and genetic diversity. Eight microsatellite loci were selected for an analysis of D. moschatum populations from several octopus individuals sampled at two Mediterranean localities. The majority of microsatellite alleles were shared across the studied range, but several private alleles were also identified. Analysis of population structure identified two to four genetic clusters, mostly concordant with the geographic origin of the samples. Allelic patterns seen in individual dicyemid genotypes revealed that although dicyemids inside one host individual show low genetic variance, they do not represent genetically identical clones. These results suggest that infection is established by several dicyemid larvae within the lifetime of the host and sexual reproduction of dicyemids occurs inside the host.
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Acknowledgements
The authors are grateful to colleagues who helped with field sampling (mainly Tomáš Tyml) and also to colleagues abroad, namely Graziano Fiorito and Giovanna Ponte, who allowed us to use their facilities at Stazione Zoologica Naples.
Availability of data and material
Dataset produced in this study is available on the following link https://drive.google.com/file/d/1gLuZiwtriHedxyNkIv8bjmWmLBAUUTTF/view?usp=sharing.
Sequences produced in this study are available in Genbank under accession numbers MT703888-MT703900.
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Funding
This work was financially supported by grants from the Czech Science Foundation (GACR project nos. 15-08717S and 19-28399X).
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Drábková, M., Flegrová, T., Myšková, E. et al. Genetic analysis of dicyemid infrapopulations suggests sexual reproduction and host colonization by multiple individuals is common. Org Divers Evol 21, 437–446 (2021). https://doi.org/10.1007/s13127-021-00493-0
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DOI: https://doi.org/10.1007/s13127-021-00493-0