Lipids and fatty acids in Calanus sinicus during oversummering in the southern Yellow Sea

Wang, Yanqing; Li, Chaolun; Liu, Mengtan; Jin, Xin

doi:10.1007/s00343-017-5351-y

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…Labyrinthulea have been frequently observed to attach to aggregations in the environment (Li et al 2013;Bochdansky et al 2017); therefore, these aggregations may be consumed by zooplankton. Calanus sinicus uses DHA in lipid metabolism (Wang et al 2017), suggesting that aplanochytrids may act as important sources of DHA for C. sinicus. Finally, we recommend investigating the role of aplanochytrid prey in larvae of commercially important fish, including Japanese sardine and Pacific round herring.…”

Section: Rankmentioning

confidence: 99%

Possible aplanochytrid (Labyrinthulea) prey detected using 18S metagenetic diet analysis in the key copepod species <i>Calanus sinicus</i> in the coastal waters of the subtropical western North Pacific

Hirai

Hamamoto

Honda

et al. 2018

Plankton Benthos Res

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Metagenetic diet analyses of the 18S V9 region were conducted in 40 adult female Calanus sinicus during winter in Tosa Bay (Japan). The majority of prey items were small crustaceans (of Copepoda and Cirripedia) and diatoms, taxa that are dominant in the environment and have been previously reported as important prey items of Calanus. The abundance of sequences attributable to Dinophyta and Chlorophyta was significantly lower in C. sinicus gut contents than in environmental plankton communities, suggesting that C. sinicus avoids prey from these groups. Hydrozoans were also observed, and aplanochytrids (Labyrinthulea) were detected for the first time as a major prey of C. sinicus. Additionally, high proportions of unclassified eukaryote material were observed, suggesting undetected predator-prey relationships in key copepod species in marine ecosystems. The dietary importance of aplanochytrids, heterotrophic protists that accumulate unsaturated fatty acids such as docosahexaenoic acid, has been overlooked in previous research. Calanus sinicus is a key copepod species in the subtropical coastal regions of the western North Pacific, and a major food source for the larvae of commercially important fish; therefore, further investigation into novel prey items such as aplanochytrids is recommended to understand the complex food web structures in marine ecosystems.

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Section: Rankmentioning

confidence: 99%

Possible aplanochytrid (Labyrinthulea) prey detected using 18S metagenetic diet analysis in the key copepod species <i>Calanus sinicus</i> in the coastal waters of the subtropical western North Pacific

Hirai

Hamamoto

Honda

et al. 2018

Plankton Benthos Res

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“…As the surface temperature increases from spring to summer, copepods, which are enhanced in abundance during spring, might submerge themselves to avoid the water masses with high temperatures in the northern part of the offshore area (Hirakawa et al, 1999). These submerging copepods often contain high lipid contents (Wang et al, 2017) with reduced metabolic rates in association with the lower water temperatures (Kattner & Hagen, 2009). Latitudinal variations have also been reported with respect to zooplankton abundance (Morioka, 1985; Hirota & Hasegawa, 1999) and phytoplankton production (Chiba et al, 2005) in the Sea of Japan.…”

Section: Discussionmentioning

confidence: 99%

Cold offshore area provides a favorable feeding ground with lipid‐rich foods for juvenile Japanese sardine

Yasuda

Kitajima

Hayashi

et al. 2021

Fisheries Oceanography

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Japanese sardine (Sardinops melanostictus) in the Sea of Japan expanded their distribution from the coast to offshore with an increase in population biomass; however, little is known about the suitability of the offshore habitat for this species. Using lipid analysis, this study compared the body condition of juvenile sardine between an area off the Noto Peninsula (offshore) and the Tsushima Strait (coast), with respect to habitat conditions during the summer, from 2015 to 2017. Sardine in the offshore area had larger bodies and higher lipid contents than those in the coastal area. Regarding the sardine diet, lipid content of the offshore zooplankton was clearly higher than that of the coastal zooplankton. Hence, we found a positive effect of this dietary lipid content on sardine lipid content, suggesting that these lipid measurements could explain the trophic relationship between sardine and zooplankton. The higher lipid content in offshore zooplankton was mainly attributed to the abundance of large‐sized copepods and lower water temperatures. Such lipid measurements might involve habitat‐specific characteristics of zooplankton assemblage. In conclusion, compared to the coastal area, the offshore area is considered a more favorable habitat for the sardine in terms of lipid availability.

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“…Numerous C. sinicus individuals reside in the Yellow Sea Cold Water Mass (YSCWM) to survive through the hot summer, which is regarded as an over-summering strategy (Zhang et al, 2005). The fifth copepodite stage (C5) and female individuals dominate the population during the over-summering process, exhibiting low ingestion and metabolic rates, suspended development, confined diel vertical migration (DVM), a well-developed oil sac, and a low RNA:DNA ratio (Li et al, 2004;Wang et al, 2017). In autumn, C. sinicus in the YSCWM serve as the parental individuals for population development and can be transported southward by monsoon-driven currents (Hwang and Wong, 2005;Yin et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Vertical Fine-Scale Distribution of Calanus sinicus in the Yellow Sea Cold Water Mass During the Over-Summering Process

Cheng

Shi

et al. 2021

Front. Mar. Sci.

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Calanus sinicus, a temperate copepod with a lethal temperature >27°C, is one of the key species in Chinese coastal marine ecosystems. The C. sinicus population increases in spring and declines in early summer annually due to increasing water temperature. Numerous C. sinicus individuals then congregate in the Yellow Sea Cold Water Mass (YSCWM) and remain under the thermocline from early summer to early autumn. Development and reproduction is halted in this cold and foodless bottom water and they avoid ascending to the hot surface water, which is regarded as an over-summering strategy. Based on discrete water sampling approaches, previous studies demonstrated that higher chlorophyll a (Chl a) levels appeared in the mixed hot surface water layer; however, the subsurface chlorophyll a maximum layer (SCML) has seldom been described. In the present study, various probes and a visual plankton recorder (VPR) were used to determine the fine vertical distributions of environmental factors and C. sinicus. VPR observations showed the ecological responses in fine scale and indicated that few C. sinicus individuals ascend at night, the main population preferred to remain below the SCML all day long. The results demonstrated that a constant thin SCML existed in the YSCWM area, and that the SCML location coincided with or was beneath the thermocline and halocline layers, where the temperature was suitable for C. sinicus. The relationship between abundance and Chl a, showed the diel vertical migration trend of C. sinicus to feed at night in the YSCWM area. In addition to temperature as a main influencing factor, dissolved oxygen concentrations and column depth were also influencing factors. Therefore, in addition to avoiding high surface temperature, energy supplement may be an important driving force confining the diel vertical migration of C. sinicus in the Yellow Sea in summer.

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Lipids and fatty acids in Calanus sinicus during oversummering in the southern Yellow Sea

Cited by 4 publications

References 23 publications

Possible aplanochytrid (Labyrinthulea) prey detected using 18S metagenetic diet analysis in the key copepod species <i>Calanus sinicus</i> in the coastal waters of the subtropical western North Pacific

Possible aplanochytrid (Labyrinthulea) prey detected using 18S metagenetic diet analysis in the key copepod species <i>Calanus sinicus</i> in the coastal waters of the subtropical western North Pacific

Cold offshore area provides a favorable feeding ground with lipid‐rich foods for juvenile Japanese sardine

Vertical Fine-Scale Distribution of Calanus sinicus in the Yellow Sea Cold Water Mass During the Over-Summering Process

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