Grazing Impact of the Copepod Calanus sinicus on Phytoplankton in the Northern East China Sea in Late Spring

Kım, Garam; Kang, Hyung-Ku

doi:10.1007/s12601-018-0010-6

Cited by 2 publications

(1 citation statement)

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“…Calanus sinicus is a warm-temperate copepod species widely distributed in the shelf ecosystems of the Northwest Pacific Ocean (Chen, 1964;Li et al, 2016), and plays an important role in the marine food web (Uye, 2000;Sun et al, 2010). It is a key species in China's marine pelagic ecosystems, contributing 73-99% of the biomass of the large copepod functional group all year round in the Yellow Sea (Sun et al, 2010;Kim and Kang, 2018). The C. sinicus population usually disappears during summer in most parts of southern China seas due to increased water temperature (Li et al, 2016).…”

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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