Distribution and life history of two planktonic copepods, Rhincalanus nasutus and Rhincalanus rostrifrons, in the northwestern Pacific Ocean

Shimode, Shinji; Takahashi, Kazutaka; Shimizu, Yoshihisa; Nonomura, Takumi; Tsuda, Atsushi

doi:10.1016/j.dsr.2012.03.008

Cited by 14 publications

(4 citation statements)

References 34 publications

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“…Among the Copepoda collected in this study, the three Neocalanus species, Eucalanus bungii and Rhincalanus nasutus, which undergo ontogenetic vertical migration during their life histories, are all larger than 1 mm in body size from stage C5 to adult (Bradford-Grieve,1994;Tsuda et al, 2001b;Shimode et al, 2012a). There were no copepod species smaller than 1 mm in our swimmer samples.…”

Section: Carbon Export Through Neocalanus Active Fluxmentioning

confidence: 72%

“…Therefore, the smaller percentage of N. flemingeri and E. bungii in the flux in this study compared to N. cristatus and N. plumchrus is probably because their ontogenetic vertical migrations rarely reached the depth of the sediment trap. Rhincalanus nasutus, also rarely collected in the sediment trap, is a relatively common species in the Kuroshio Current and is known to be a species showing ontogenetic vertical migration, with adults inhabiting the mesopelagic depths (Shimode et al, 2012a). Other than R. nasutus, four Kuroshio species, Eucalanus californicus, Eucalanus hyalinus, Pleuromamma xiphias, and Paraeuchaeta elongate, were observed very rarely in the sediment trap (Supplementary Table S1).…”

Section: Swimmers Collected In Deep Trapmentioning

confidence: 99%

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Neocalanus cristatus (Copepoda) From a Deep Sediment-Trap: Abundance and Implications for Ecological and Biogeochemical Studies

et al. 2022

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We studied seasonal variations of the mesozooplankton swimmer community collected by a sediment trap moored at 873 m in the Kuroshio–Oyashio Transition region off the east coast of Japan from 5 August 2011 to 23 June 2013, with sampling bottles rotating at 26-day intervals. The total flux of mesozooplankton swimmers varied between 0 and 11.1 individuals m–2 d–1, with a mean of 3.1 individuals m–2 d–1 during the sampling period. In total, 89 taxa were found in the trap material, of which copepods comprised 87.1% of all swimmers on average. Among the Copepoda, Neocalanus cristatus was the most dominant taxon (76.2% of copepods on average during the sampling period), and all of them were stage C5 copepodite to adult. The species composition of the swimmers closely reflected the mesopelagic mesozooplankton of the Oyashio region. Because all N. cristatus observed in the trap were stage C5 to adult, its flux represents a time series of variations in life history and response to environmental changes at the depth of the sediment trap. The fluxes of Neocalanus species (N. cristatus, N. flemingeri, and N. plumchrus) reflected ontogenetic vertical migration, but may have been overestimates of active fluxes if they included dormant individuals that accidentally entered the sediment trap. The apparent active carbon flux of Neocalanus species ranged from 0 to 22.3 mg C m–2 d–1 during the sampling period, with a mean value of 4.9 mg C m–2 d–1.

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Section: Carbon Export Through Neocalanus Active Fluxmentioning

confidence: 72%

Section: Swimmers Collected In Deep Trapmentioning

confidence: 99%

Neocalanus cristatus (Copepoda) From a Deep Sediment-Trap: Abundance and Implications for Ecological and Biogeochemical Studies

et al. 2022

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“…Thus, the proportion of GS4 adult females, i.e., RI (reproductive index, %), has been considered as a good indicator for the prediction of EPR (Runge 1987). Similarly, these four stages of GS have been confirmed in other broadcast calanoid families such as Eucalanidae (e.g., Smith & Lane 1991, Shimode et al 2012a) and Rhicalanidae (e.g., Schnack-Schiel et al 2008, Shimode et al 2012b. To increase the accuracy of EPR prediction for C. finmarchicus, Niehoff & Runge (2003) refined and subdivided GS4 into three categories, which were defined as high, intermediate, and low numbers of matured oocytes indicating pre-spawned clutch sizes.…”

Section: Introductionmentioning

confidence: 77%

Empirical prediction model for egg production rate of a planktonic copepod, <i>Calanus sinicus</i>, estimated from reproductive index using formalin-preserved samples in Sagami Bay, Japan

Shimode

Yamaguchi

Hidaka

2022

Plankton Benthos Res

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Calanus sinicus is one of the most dominant planktonic copepods and plays a key role as a secondary producer in the mid-latitude coastal shelf areas of the Northwestern Pacific. In this study, we investigated seasonal changes in in situ egg production rate (EPR) of C. sinicus collected from March 2014 to February 2015 in Sagami Bay, Japan. Simultaneously, we collected formalin-preserved samples to measure reproductive index (RI), which was calculated as the proportion of individuals with matured gonad to total females in each sample. Monthly averages of EPR and RI varied from 2.4 to 44.9 eggs female −1 day −1 and 0% to 75.9%, respectively. RI showed a significant positive effect on EPR. Moreover, EPR decreased with increasing temperature, which was the inverse of the effect of temperature on EPR reported in a previous study in the Seto Inland Sea. The difference between the studies suggests that the local population may adapt to different temperature environments in each location. Using a stepwise multiple regression model, EPR estimates for C. sinicus in Sagami Bay were explained by the average water temperature and RI with high probability (R 2 =0.71). Although local water temperature ranges must be considered before applying our model to other areas, the model would be useful to reconstruct past secondary production of C. sinicus from preserved samples collected in other neighboring coastal areas.

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“…Some large copepods like Eucalanus californicus, Rhincalanus nasutus, R. rostrifrons , and Neocalanus gracilis are known to appear in copepod community around the Kuroshio region (Hirota, ). These species appear at the surface and increase in biomass during the spring to early summer (Shimode, Hiroe, Hidaka, Takahashi, & Tsuda, ; Shimode, Takahashi, Shimizu, Nonomura, & Tsuda, ,). In summary, mesozooplankton biomass and productivity in the ECS‐Kuroshiro are likely to undergo seasonal fluctuations.…”

Section: Discussionmentioning

confidence: 99%

Geographic variability in taxonomic composition, standing stock, and productivity of the mesozooplankton community around the Kuroshio Current in the East China Sea

Kobari

Makihara

Kawafuchi

et al. 2018

Fisheries Oceanography

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Despite the low productivity that has been thought to characterize plankton communities in the western boundary current of the North Pacific Subtropical Gyre, many migratory fishes risk encountering low food availability during crucial life history stages by reproducing and recruiting in the Kuroshio region (i.e., the Kuroshio Paradox). Here, we report on geographic variability in taxonomic composition, biomass, and productivity of the mesozooplankton community in the Kuroshio Current and neighboring waters in the East China Sea. Calanoid copepods were the most abundant mesozooplankton taxon throughout our sampling stations. Small copepods, which include nauplii and poecilostomatoids, and gelatinous metazoans were the next most abundant. Seasonal variability in mesozooplankton standing stock (i.e., abundance and biomass) and productivity (i.e., production rate and protein synthetase activity) exceeded spatial variability across the stations and regions. The mesozooplankton community was characterized by high biomass and production rates in the summer, as well as high abundance and protein synthetase activity in the fall. No significant differences were found for mesozooplankton standing stock and productivity in the Kuroshio Path relative to those on the continental shelf or on the outside of the Kuroshio Path. Our results indicate that the standing stock and productivity of the mesozooplankton community in the Kuroshio Path are equivalent to those on the continental shelf, and that these communities are supported by small copepods and gelatinous zooplankton. We suggest that the mesozooplankton standing stocks and productivity provide adequate food availability for migratory fishes in the Kuroshio and neighboring waters in the East China Sea.

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Distribution and life history of two planktonic copepods, Rhincalanus nasutus and Rhincalanus rostrifrons, in the northwestern Pacific Ocean

Cited by 14 publications

References 34 publications

Neocalanus cristatus (Copepoda) From a Deep Sediment-Trap: Abundance and Implications for Ecological and Biogeochemical Studies

Neocalanus cristatus (Copepoda) From a Deep Sediment-Trap: Abundance and Implications for Ecological and Biogeochemical Studies

Empirical prediction model for egg production rate of a planktonic copepod, <i>Calanus sinicus</i>, estimated from reproductive index using formalin-preserved samples in Sagami Bay, Japan

Geographic variability in taxonomic composition, standing stock, and productivity of the mesozooplankton community around the Kuroshio Current in the East China Sea

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