Abstract
Despite the ecological importance of copepods Pseudocalanus spp., no genetic analyses have been carried out for these species in the western North Pacific. This study investigated the genetic structures of Pseudocalanus spp. in the Okhotsk Sea using mitochondrial cytochrome c oxidase subunit I (mtCOI) and single nucleotide polymorphism data obtained using multiplexed inter-simple sequence repeat genotyping by sequencing (MIG-seq). Pseudocalanus acuspes was detected based on mtCOI for the first time in the Okhotsk Sea, along with the common species P. minutus and P. newmani in the western North Pacific. The coastal species, P. acuspes and P. newmani, showed unique populations in the Okhotsk Sea, distinct from those in the Bering, Chukchi, Beaufort Seas, and the Atlantic Ocean. However, P. minutus with oceanic distribution patterns showed high gene flow and no clear population in the North Pacific and Pacific Arctic regions. The higher genetic diversity observed in P. newmani compared to P. acuspes and P. minutus was likely due to the wider distribution of P. newmani tolerant to warm waters. A different genetic population structure between the Okhotsk Sea and the Arctic Ocean in P. acuspes was not detected by mtCOI but by MIG-seq analysis. Thus, ecological differences strongly influence the genetic population structures of three Pseudocalanus species in the Okhotsk Sea; these results suggest the need for genome-wide methods to reveal the detailed population structures of marine zooplankton.
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Acknowledgements
We thank the captains, crews, and all members of Garinko-II and RV Hakuho-maru for assisting with field sampling during the cruises. We thank H. Yoshida for assisting with sampling at the Okhotsk Tower in Okhotsk Sea. We are also grateful to M. Noda for her assistance in performing molecular analyses at the laboratory. We also thank the anonymous reviewers for suggestions on the manuscript.
Funding
This study was supported by grants from the Japan Society for the Promotion of Science (grant number: 20H03057) and Asahi Glass Foundation.
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All applicable international, national, and/or institutional guidelines for animal testing, animal care, and use of animals were followed by the authors.
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The mtCOI sequences obtained in this study are publicly available from GenBank (accession numbers LC705904–LC706198). Raw MIG-seq sequence data are available from the NCBI/EBI/DDBJ Sequence Read Archive (BioProject accession number PRJDB13375).
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JH, SK, and NS conceived and designed the study. Sampling was performed by JH and SK. JH conducted the experiments in a laboratory with the assistance of SN. JH analyzed the data. JH wrote the draft of the manuscript; SK and NS contributed to reviewing and editing the manuscript.
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Hirai, J., Katakura, S. & Nagai, S. Comparisons of genetic population structures of copepods Pseudocalanus spp. in the Okhotsk Sea: the first record of P. acuspes in coastal waters off Japan. Mar. Biodivers. 53, 12 (2023). https://doi.org/10.1007/s12526-022-01323-y
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DOI: https://doi.org/10.1007/s12526-022-01323-y