Hirai, J. (2022). [Resolving taxonomic problems of copepods in the North Pacific Ocean and its application to a marine biomonitoring.]. Grant-Supported Research Report to The Asahi Glass Foundation. 82:1-7.. [In Japanese; English abstract].
[Resolving taxonomic problems of copepods in the North Pacific Ocean and its application to a marine biomonitoring.]
Grant-Supported Research Report to The Asahi Glass Foundation
82:1-7.. [In Japanese; English abstract]
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Molecular and morphological analyses were used to resolve the taxonomy of the copepod Metridia pacifica species complex in the North Pacific. Phylogenetic analysis of mitochondrial cytochrome c oxidase subunit I (COI) revealed two lineages of M. lucens and M. pacifica , and M. pseudopacifica in the eastern Pacific was included in M. lucens . The presence of M. lucens and M. pacifica was confirmed across the North Pacific, and genetic structures were observed in M. lucens between eastern and western North Pacific. The morphological identification character of length of setae on the fifth pair of legs was not useful for classifying adult female M. pacifica and M. lucens . However, combinations of prosome length and head angle successfully classified >98.2% of M. pacifica and M. lucens specimens from the North Pacific. Because M. lucens and M. pacifica have different distribution patterns and ecologies, accurate classification of these two species leads to improving detection of ecosystem change in the oceans.
