• 한국군사과학기술학회지
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• 제13권5호
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• pp.941-949
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• 2010

The present study investigated the swimming pattern and appendage postures of a copepod species, Calanus sinicus, which prevails in the south-east sea of the Korean peninsula, by employing a digital holographic particle tracking velocimetry(PTV) technique. The results showed that the copepod Calanus sinicus had various swimming patterns such as hover, hop, sink, cruise, and downward cruise. Most frequent pattern was the 'hop and sink'. The average swimming speeds ranged from 1.1 to 45.7 body-lengths/s, and the corresponding flow Reynolds number ranged from $10^0$ to $10^2$.

• Ocean and Polar Research
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• 제44권3호
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• pp.261-267
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• 2022

We derived a length-weight relationship for Calanus sinicus off Busan, Korea in spring to estimate the biomass of the C. sinicus population around Korean waters, and compared it with the previously derived equations. The developmental stages and prosome length of C. sinicus used in the relationship ranged from 1,376-1,540 ㎛ for copepodite 4 (CIV), 1,753-1,971 ㎛ for copepodite 5 (CV), and 2,160-2,283 ㎛ for adults (CVI). Dry weight and carbon content were measured from a total of 26 replicates. Length-weight relationships derived in the present study are as follows: log C = 3.342 log PL - 9.449, log DW = 3.394 log PL -9.219, where C is carbon content (㎍), DW is dry weight (㎍), and PL is prosome length (㎛). When comparing the present regression equation of length-weight for C. sinicus with the previous one, our regression equation showed an average carbon estimate to a given range of mean prosome length. The length-weight relationship of C. sinicus in the present study can be used to better estimate the biomass of the C. sinicus population in the coastal waters of Korea.

• 한국수산과학회지
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• 제30권3호
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• pp.413-422
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• 1997

조간대에 서식하는 왜풀망둑의 서식지 환경과 섭식생태를 파악하여 연안 생물군집의 먹이사슬에 관한 기초지식을 얻고자, 1993년 7월부터 1994년 6월까지 군산연안의 내초도에서 매월 1회씩 왜풀망둑을 채집하면서 서식지 환경을 조사하고, 위내용물 분석을 통해 섭식생태를 조사하였다. 본 조사기간 동안 조간대의 수온은 $4.5\~33.2^{\circ}C$, 석온은 $3.5\~29.1^{\circ}C$, 염분은 $21.68\~27.41\%_{\circ}$, 해수 pH는 $7.6\~8.1$, 저질 pH는 $8.5\~9.2$, 저질함수량은 $48.5\~76.2\%$ 및 저질의 유기물함량은 $1.67\~2.81\%$의 범위를 나타내었다. 왜풀망둑의 위내용물 중량비는 $1.78\%$, 위만복도도 거의 비슷한 값을 나타내었으며, 위만복도는 하루 중 오전과 오후에 각각 한 차례씩 증가하는 경향을 보였다. 왜풀망둑의 위내용물에서 출현한 먹이생물 중 개체수가 가장 많은 것은 copepods로 $54\%$의 조성비를 나타내었다. 계절별 주요 먹이생물의 출현양상은 봄에 Paracalanus parvus, 여름에 Calanus sinicus, 가을에 Acartia sp., 겨울에 Calanus sinicus 등이 가장 많이 출현하였다. 계절간 먹이생물의 중복도는 봄과 여름 사이에서만 크게 나타났고 나머지 계절 사이에서는 그다지 크지 않았다. 체장별 먹이생물의 차이는 거의 볼 수 없었으며, 체장별 주요 먹이생물의 조성을 보면, 주로 copepods, decapods, molluscs 및 cirriped larvae 등의 순으로 많이 출현하였고, 체장이 커질수록 amphipods, polychaete larvae, isopods, cumaceans 및 stomatopods등의 출현율이 점점 증가하였다. 주요 먹이생물의 중요도지수는 Calanus sinicus, Corycaeus affinis 및 Acartia sp. 등의 순이었다.

• Journal of the korean society of oceanography
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• 제33권1-2호
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• pp.28-34
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• 1998

Variations in abundance, size and population structure of Calanus sinicus were studied in the southern waters of Korea in connection with hydrographic conditions during 1991-1992. Abundance was high in April and low in August. This species was concentrated inshore of a coastal temperature front, or around the temperature front in April. The 1st-3rd copepodites dominated in February and April, and adults in August. The mean population stages in February and April were younger than those in other survey months. This suggests that this species mainly reproduced during winter-early spring. In prosome length, the 1st-4th copepodites were larger in April than in other survey months, and the 5th copepodite and adult were the largest in February. Mean prosome length of C. sinicus showed weak inverse relationship with sea water temperature, but it was not statistically evidenced.

• Ocean and Polar Research
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• 제38권4호
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• pp.303-314
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• 2016

We tested the combined effects of increased partial pressure of $CO_2$ ($pCO_2$) and temperature on the reproduction and survival of the copepod Calanus sinicus from Asan Bay, the Yellow Sea under laboratory conditions to understand the impact of acidification on copepods. Egg production rate, survival rate, and fecal pellet production of C. sinicus were not affected by 1305 ppm $pCO_2$ or with combined treatments of temperature and $pCO_2$, including $8^{\circ}C$ and 289 ppm $pCO_2$ (ambient), $8^{\circ}C$ and 753 ppm $pCO_2$ (high $pCO_2$), $12^{\circ}C$ and 289 ppm $pCO_2$ (high temperature), and $12^{\circ}C$ and 753 ppm $pCO_2$ (greenhouse), for 5 or 10 d of exposure. However, egg hatching success of C. sinicus decreased significantly in the greenhouse treatment compared with the ambient or the high $pCO_2$ treatments. These results suggest that a combined treatment ($pCO_2$ and temperature) affected egg viability more than a single treatment($pCO_2$).

• 한국해양학회지
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• 제27권1호
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• pp.11-18
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• 1992

요각들은 Calanus sinicus와 Acartia clausi(A. omorii)의 먹이섭취 양상을 파악 하기 위하여 식물 플랑크톤의 농도변화와 시간경과에 따른 먹이섭취율 및 여과율의 변 화를 실험실에서 조사하였다. 두종의 요각류들의 여과율은 먹이농도가 증가에 따라서 감소했으며, 평균 여과율은 C. sinicus가 2.42 ml/copepod/hr,이고, A. clausi가 3.37 ml/copepod/hr. 이였다. 먹이섭취율은 먹이농도의 증가에 따라 다소 변동은 있지만 수 평적으로 일정하게 유지되는 경향을 보였다. 시간에 따른 요각류들의 여과율은 주기성 을 보이지 않고 전반적으로 감소하는 경향을 보였으나 A. clausi 는 어떤 시간의 경과 후 증가하는 경향을 보였다. 결과적으로 신물플랑크톤의 농도변화에 따른 요각류의 먹 이섭취율과 여과율의 경향은 유사하게 나타났지만, 측정된 값들은 다소 차이를 보였 다. 그리고 시간경과에 따른 조사에서 두종의 요각류들은 불연속적인 포식활동을 전개 하는 것으로 나타났다.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 1998년도 수산관련공동학술대회발표요지집
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• pp.359.1-359
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• 1998

• 수산해양교육연구
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• 제29권3호
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• pp.869-877
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• 2017

The monthly variations of zooplankton community were investigated at 12 stations near Tongyeong and Namhaedo in the South Sea of Korea from April to July, 2012. Zooplankton samples were collected by a plankton net (RN80) from near the bottom to the surface. Zooplankton community consisted of 97 taxa, and the mean abundance ranged from $213inds.m^{-3}$ in July to $426inds.m^{-3}$ in April. Copepods constituted 38.98% of zooplankton abundance, and included 39 species. Calanus sinicus, Corycaeus affinis, Paracalanus parvus s.l., copepodids, Evadne nordmonni, Podon leuckarti, cirriped nauplii, Muggiacea sp., Diphyes sp., and Zonosagitta bedoti were dominant species. Of these, Calanus sinicus was the most abundant throughout the study period, being constituted 18.6% of total zooplankton abundance. The density variations of dominant species between stations and months were correlated with the environmental factors. Zooplankton community varied with by sampling months, being influenced by monthly oceanographic variations.

• 한국수산과학회지
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• 제24권6호
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• pp.472-482
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• 1991

아산만 동물 플랑크톤의 계절별 분포를 조사하였다. 년중 Labidocera euchaeta, Safitta crassa, Calanus sinicus, Acartia omorii 등이 계절에 따라 다른 점유율을 보이며 주요 우점종으로 나타났고, 기타 계절에 따라 이매패 유생(가을), 십각류 유생(봄, 여름) Paracalanus Parvus, Evadne tergestina(여름) 등이 주요 우점종에 포함되었다. 주요 우점종인 A. omorii는 계절에 따라 주야 수직분포가 다른 양상을 보였는데, 겨울철에는 정상적인 주야 수직이동, 봄철에는 역전된 주야 수직이동을 하는 것으로 여겨졌다. 대부분 표층에서는 야간과 비교하여 주간에 통상 같거나 적은 양의 개체수 분포를 보였다.

• Ocean and Polar Research
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• 제43권4호
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• pp.269-277
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• 2021

We investigated mesozooplankton community in the Yellow Sea in summer immediately after the typhoon passed. Total mesozooplankton density ranged from 1,323 to 6,397 ind. m^-3 and the biomass ranged from 3 to 28 mg C m^-3 by stations. The dominant species of the research area were Paracalanus parvus s.l., Oithona atlantica, Acartia omorii, Oikopleuridae, Sagittoidae juvenile and Calanus sinicus in that order. Mesozooplankton community was divided into two groups by cluster analysis : the stations located in coastal and open seas as one group, and the stations located in the middle into another group. The number of species, density and richness of mesozooplankton were significantly lower in the middle region. Mesozooplankton density and biomass were not significantly correlated with chl-a concentrations, unlike previous studies in spring and autumn. This community characteristic in summer may be due to the passing of the typhoon, or other environmental influences.