Occurrence of the &lt;i&gt;Paracalanus parvus&lt;/i&gt; species complex in offshore waters south of Japan and their genetic and morphological identification to species

Hidaka, Koichi; Itoh, Hiroshi; Hirai, Junya; Tsuda, Atsushi

doi:10.3800/pbr.11.131

Cited by 12 publications

(4 citation statements)

References 27 publications

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“…Paracalanus parvus is another common coastal species found in this study. The precise taxonomy of this species is still in debate, with 'major' and 'minor' morphological forms described by earlier investigator (e.g., Hirota, 1964), and more recent genetic analysis has suggested a P. parvus species complex in Japanese water that comprises of multiple species (Hidaka et al, 2016). This species sensu lato was abundant in Seto Inland Sea in our study, similar to previous reports (Yamazi, 1952;Hirota, 1969).…”

Section: Discussionsupporting

confidence: 89%

Dead heat: copepod carcass occurrence along the Japanese coasts and implications for a warming ocean

Tang

Ivory

Shimode

et al. 2019

ICES Journal of Marine Science

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Understanding global warming effects on marine zooplankton is key to proper management of marine resources and fisheries. This is particularly urgent for Japan where the coastal water temperature has been increasing faster than the global average over the past decade. Conventional sampling and monitoring programmes, by ignoring the in situ vital status of the zooplankton, produce incomplete information about the state of the ecosystem. We showed that marine copepod carcasses were ubiquitous along a latitudinal gradient of 34–39°N of the Japanese coasts. On average, 4.4–18.1% of the individuals of the main copepod genera (Acartia, Paracalanus, Oithona, and Pseudocalanus) were carcasses, equivalent to 19–250 µg C m−3. Higher fractions of dead copepods tended to occur at higher water temperatures, implicating temperature-dependent non-predation mortality. Carcass occurrence may represent a loss of copepod production for the traditional predation-based food chain. On average, 49.5% of the carcass carbon would be remineralized in the water column via bacteria respiration, with the remainder potentially exported to the seafloor. Continuous warming in the Japanese coasts is expected to accelerate non-predation copepod mortality, with unknown consequences for the local marine food web.

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Section: Discussionsupporting

confidence: 89%

Dead heat: copepod carcass occurrence along the Japanese coasts and implications for a warming ocean

Tang

Ivory

Shimode

et al. 2019

ICES Journal of Marine Science

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“…(Slope and Kuroshio) or P . tropicus (Subtropical) in the metagenetic analysis, according to Hidaka et al [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…For example, the morphological species Paracalanus parvus s.l. was composed of at least three reproductively isolated species in the study area [ 35 ], and Paracalanus sp. and P .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of metagenetic community analysis of planktonic copepods using Illumina MiSeq: Comparisons with morphological classification and metagenetic analysis using Roche 454

2017

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Metagenetics is a rapid and taxonomically comprehensive method for revealing community structures within environmental samples, based on large amounts of sequence data produced by high-throughput sequencers. Because community structures of planktonic copepods are important in the ocean owing to their high diversity and abundance, a metagenetic analysis of the 28S D2 region using Roche 454 was previously developed. However, the Illumina MiSeq platform with a high sequence output is being used more frequently in metagenetics, and non-calanoid copepods have not previously been fully evaluated. Here, we evaluated an Illumina MiSeq-based metagenetic analysis using a mock community and field-collected samples that were examined in a previous study using Roche 454, and the community structure, including non-calanoid copepods, was compared among morphological and metagenetic analyses. We removed a singleton read and applied an appropriate abundance threshold to remove erroneous Molecular Operational Taxonomic Units (MOTUs) with low-abundance sequences in the MiSeq-based analysis. Results showed that the copepod community was successfully characterized using Illumina MiSeq. Higher-quality sequences were obtained using MiSeq than by Roche 454, which reduced the overestimation of diversity, especially at a strict 99% similarity threshold for MOTU clustering. Taxonomic compositions in terms of both biomass and presence/absence of species, including non-calanoids, were more appropriately represented in the MiSeq- than in Roche 454-based analysis. Our data showed that metagenetic analysis using Illumina MiSeq is more useful for revealing copepod communities than Roche 454, owing to the lower cost and higher quality.

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“…The common calanoid copepod known as Paracalanus parvus (Claus, 1863) s.l. in Japan has recently been reported to consist of three species (Hidaka et al 2016) and the most common of these has been described as the new species P. orientalis (Ueda et al 2022). However, the name P. parvus s.l.…”

Section: Methodsmentioning

confidence: 99%

Copepod community structure in the highly turbid innermost part of Ariake Bay in the 2000s with special reference to high abundances of <i>Oithona davisae</i>

Beltrão

Monde

Mine

et al. 2023

Plankton Benthos Res

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Ariake Bay has Japanʼs biggest nori seaweed farming field in the innermost part and has suffered from environmental degradation since the late 1990s. To elucidate the seasonal patterns in the copepod community structure in the inner bay, we examined monthly plankton-net samples collected in the top 2-m layer at 11 stations for 5 years from April 2002 to March 2007. Of the 11 stations, 7 were at the high-turbidity site (HTS) representing the nori farming field and 4 in the offshore low-turbidity site (LTS) for comparison. The copepod community in the HTS was dominated almost year round by Oithona davisae, whose 5-year mean abundance of 203 ind. L −1 comprised 84% of copepods and was more than double that in the LTS. O. davisae became extremely abundant in summer with the maximum monthly mean abundance in the HTS of 2756 ind. L −1 and the maximum sample-specific abundance of 10116 ind. L −1 . The following predominant copepods in the HTS were Parvocalanus crassirostris in summer-autumn, Microsetella norvegica in summer, Acartia omorii in spring, and Paracalanus parvus s.l. irregularly. Possible causes for high abundance of O. davisae in the HTS are assumed to be sufficient food resources, water temperature over 21°C, and a wide salinity tolerance range of the species.

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Occurrence of the <i>Paracalanus parvus</i> species complex in offshore waters south of Japan and their genetic and morphological identification to species

Cited by 12 publications

References 27 publications

Dead heat: copepod carcass occurrence along the Japanese coasts and implications for a warming ocean

Dead heat: copepod carcass occurrence along the Japanese coasts and implications for a warming ocean

Evaluation of metagenetic community analysis of planktonic copepods using Illumina MiSeq: Comparisons with morphological classification and metagenetic analysis using Roche 454

Copepod community structure in the highly turbid innermost part of Ariake Bay in the 2000s with special reference to high abundances of <i>Oithona davisae</i>

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