• Journal of the korean society of oceanography
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• 제33권1-2호
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• pp.8-17
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• 1998

Paleoceanographic history of the East Sea is reconstructed based on several environmental parameters (coarse fraction content, planktonic foraminifera/benthic foraminifera ratio, fragmentation and assemblages of planktonic foraminifera, and coiling ratio of Neogloboquadrina pa-chyderma, etc,) of the late Quaternary sediments obtained from the Ulleung Basin. N. pa-chydeyma and Globigerina bulloides are dominant species (greater than 90% in abundance)among the total planktonic foraminifera assemblages in the late Quaternary sediments. The benthic foraminifera rarely occurred throughout the cores. Sinistrally-coiled specimens of N. pa-chyderma representing cold water temperature are observed more abundantly than dextrally-coil-ed ones. In addition, the sinistrally-coiled N, pachydeyma showed more the amount at the lower part of the cores than at the upper part suggesting the restriction of the Tsushima Warm Current into the East Sea during glacial period. G. bulloides, a species representative of upwelling condition, shows more abundant occurrence in the sediments of Core 941013 than those of Core 941006. This implies that Core 941013 is more influenced by upwelling than Core 941006. The upper part of the two cores contain more fragmentation of planktonic foraminifera suggesting significant dissolution by corrosive bottom wafer. Ascending CCD also played an important role for the absence of planktonic foraminifera at the upper part of the cores.

• 한국제4기학회지
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• 제19권2호
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• pp.35-37
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• 2005

Sediment samples from five stations at the Shihwa Lake sewage outfall, west coast of Korea, were collected to evaluate the effect of the outfall on benthic foraminifera. Heavy metal (Cu and Zn) polluted eastern part of the Shihwa Lake, adjacent to the Shihwa-Banwol Industrial Complexes, shows barren or nearly barren of benthic foraminifera, and the lowest number of species both at the core top and downcore. Excepting for the barren zone, pyritized benthic foraminifera abundantly occur both at the surface and downcore sediments in the western part of the Shihwa Lake, suggesting that foraminiferal disease by anoxic bacteria. Recent intrusion of pollutants from the Shihwa-Banwol Industrial Complexes and adjacent six major streams severely polluted the Shihwa Lake as shown by the low abundance (number/10 g) of benthic foraminifera, low number of A. beccarii, low species diversity, and absence of both Elphidium spp. and ostracodes at the surface sediments compared to the downcore. Except the barren zone, both pyritized and non-pyritized Ammonia beccarii occur dominantly in the surface sediments and downcore. Elphidium spp. (either pyritized or non-pyritized) do not occur in the surface sediments of whole stations. However, they occur from the entire downcore sediments except in the eastern part of Shihwa Lake. Arenaceous foraminifera do not inhabit in the heavily polluted areas as evidenced by the occurrence of relatively deep core depth (11-50 cm). Ostracodes occur at the downcore sediments, but they do not occur at the surface sediments. Ostracodes also do not occur at the heavily polluted areas in the eastern part of the Shihwa Lake both at the surface and downcore sediments, indicating that the abundance of ostracodes also can be used for a pollution indicator.

• 한국해양학회지:바다
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• 제1권1호
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• pp.32-45
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• 1996

광양만 동부해역의 퇴적과정의 변화를 이해하기 위하여 표층퇴적물 분포 및 시추코어에 대한 저서성 유공충 분석을 실시하였다. 사주지역에 대한 음향측심기를 이용한 결과 POSCO의 준설과 매립으로 인하여 해저지형이 변화되고 사주가 남동 방향으로 확대된 것으로 나타났다. 표층퇴적물의 분포는 섬진강 퇴적물 유입의 영 향을 받는 사주지역에서 사질퇴적상이 우세하고 만의 북동쪽으로 갈수록 세립한 퇴적양상을 보인다. 사주 경계 지역의 저서성 유공충 분포는 온대종인 Ammonia beccarii, Elphidium excavatum, Quinqueloculina lamarckiana우세하게 나타났으며 시추코어의 깊이별 유공충의 개체수 및 균등도의 변화가 적은 것으로 나타났다.

• 한국해양학회지
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• 제22권3호
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• pp.153-167
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• 1987

현생 저서공충의 연수방법, 특히 연구재료의 채집에서부터 유공충개체수의 계수과정까지를, 소홀히 하기 쉬운 처리과정에 유의하면서, 상세히 설명하였다. 아울 러서 표준으로 쓸 만한 방법을 제시하였다. 훈련된 솜씨에 의한 일관적인 방법의 적용은 연구결과에 비교해 대단히 중요하다. 기초적인 연구재료 분석항목 즉 유공 충의 절대 개체수와 보존상태, 다양성, 피각의 조성에 따르는 구성비율, 우점도, 향 사도 및 저서유공충 군집에서 부유유공충의 산출을 적절한 예를 들어 가면서 설명 하였다.

• Journal of Species Research
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• 제6권spc호
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• pp.75-93
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• 2017

As a part of a survey of indigenous biological resources of Korea, 30 marine benthic foraminiferal species belonging to 24 genera and seven orders (Astrorhizida, Lagenida, Lituolida, Miliolida, Robertinida, Rotaliida and Textulariida) were identified. Bottom sediment samples were collected from eight stations on the west and east coast of South Korea, in April 2015 and May 2016, respectively. Ten species belonging to nine genera and five orders (Lagenida, Lituolida, Robertinida, Rotaliida, Textulariida) were identified in the Yellow Sea. Among these taxa, Rotaliida was the dominant order, represented by four species: Evolvocassidulina tenuis (Phleger & Parker, 1951), Cibicides mabahethi Said, 1949, Cibicides pseudolabatulus Perelis & Reiss, 1975 and Cibicidoides barnetti Bermudez, 1949. Twenty species belonging to 15 genera and five orders (Astrorhizida, Lagenida, Lituolida, Miliolida, and Rotaliida) were identified from the East Sea and the Lagenida was the dominant order, represented by 11 species: Lagena strumosa Reuss, 1858, Lagena nebulosa (Cushman, 1923), Lagena striata var. semiornata Reuss, 1863, Procerolagena cylindrocostata Albani & Yassini, 1989, Fissurina bispinata $Ujii{\acute{e}}$, 1963, Oolina laevigata d'Orbigny, 1839, Polymorphina amplissima McCulloch, 1977, Polymorphina subelliptica McCulloch, 1977, Guttulina succincta McCulloch, 1977, Guttulina neoproblema McCulloch, 1977 and Lagenosolenia obtecta McCulloch, 1977. The findings described here increased the number of foraminiferal species in Korea to approximately 1060, and contribute to our understanding of the diversity of foraminifera in Korean waters.

• 한국지구과학회지
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• 제30권4호
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• pp.409-426
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• 2009

남해 여자만에서 홀로세 후기 해수면 변화에 상응하는 저서성 유공충 변화를 알아보기 위하여 4개의 주상시료를 채취하고, 입도분석, 유공충 종 분류 및 군집 설정, 통계 분석을 실시하였다. 주상시료의 구성퇴적물은 주로 세립질의 실트와 점토로 구성된다. 저서성 유공충은 Core YC-1에서 16속 27종, YC-2에서는 21속 30종, YC-3에서는 29속 50종 그리고 Core YC-4에서는 29속 52종이 분류되었다. 집괴분석 결과 Core YC-1과 YC-2의 Group 1은 A. beccarii 군집이 대표군집으로서 만 상부 퇴적환경, Core YC-3과 YC-4의 Group 2는 E. clavatum-A. beccarii 군집이 대표군집으로서 외해수의 영향을 상대적으로 많이 받는 하부 내만 환경 하에서 퇴적된 것을 지시하고 있다. 종 구성 분석 결과, 하부로부터 상부로 향하여 A. beccarii의 산출빈도는 점점 감소하였고, E. clavatum과 P.F./T.F.의 산출빈도는 점점 증가하였다. 저서성 유공충과 부유성 유공충에서 나타난 이러한 변화 형태는 여자만내에서 홀로세 후기 해수면 상승을 반영하고 있는 것으로 생각된다.

• Journal of Species Research
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• 제8권4호
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• pp.389-394
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• 2019

Foraminifera are protists that inhabit diverse marine environments and show high abundance and diversity. However, previous studies on foraminifera in Korea mostly focused on geological and paleoecological fields and were conducted in a limited area. Therefore, there is a high possibility for discovering new and unrecorded species. Here we describe three newly recorded foraminiferal species from the southwestern part of Jeju Island during a survey on the meiofaunal community, which belongs to three different genera (Ammobaculites, Cylindroclavulina, Saracenaria), three families (Lituolidae, Vaginulinidae, Valvulinidae), and three orders (Lituolida, Textulariida, Vaginulinida): Ammobaculites formosensis Nakamura, 1937, Cylindroclavulina bradyi (Cushman, 1911), and Saracenaria hannoverana (Franke, 1936). These species have been reported from Chinese region in the East China Sea, however this is the first report from Korean waters. Particularly, Cylindroclavulina bradyi is the first report of the genus Cylindroclavulina in Korean waters. The present study supports the diversity of foraminiferal species in Korea, and the necessity of further surveys in Korean waters.

• Ocean and Polar Research
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• 제29권3호
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• pp.233-244
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• 2007

Nine surface sediments from Masan Bay and Gadeog Channel were taken for grain size and geochemical and foraminiferal analyses in August 2002. The sediments consist of mud with 7.29-8.54 $\phi$ in mean grain size. Average concentrations of Al, Fe and Mn are higher in Gadeog Channel than those in Masan Bay. On the other hand, average concentrations of Pb, Cu, Zn, Cd, Cr, Ni and V are higher in Masan Bay than those in the channel. The latter group of elements show the highest concentration at station M4, off the outfall of treated wastewater disposal. Eighty-one foraminiferal species are identified in total assemblages, including 21 species of living populations. The number of individuals, species number, species diversity and equitability in Masan Bay have lower values than those in Gadeog Channel. The foraminiferal fauna off the outfall is relatively poor. Compared to geochemical and foraminiferal data obtained in 1996, heavy metals are more enriched, and the characteristics of foraminifera are little changed. These features indicate that the pollution of Masan Bay has not been reduced.

• 한국해양생명과학회지
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• 제8권1호
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• pp.8-31
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• 2023

북동중국해 대륙붕 표층 퇴적물에서 산출하는 저서성 유공충의 군집 분포와 형성 기작을 파악하기 위하여 32개 정점에서 표층 퇴적물을 채취하고, 입도조성, 저서성 유공충 군집분석, ¹⁴C 연대측정을 실시하였다. 표층 퇴적물은 사질(평균: 52.04%)의 잔류 퇴적물과 니질(평균: 47.92%)의 현생 퇴적물과의 혼합 퇴적상이다. 저서성 유공충은 총 48속 104종(사질 유공충, 석회질 유리상 및 석회질 자기상 유공충)이 분류되었다. 사질 유공충은 양쯔강 앞 해역으로 산출빈도(30%)가 증가하며, 부유성 유공충은 제주 남서해역에서 높은 산출빈도를 보인다. 우점종은 Ammonia ketienziensis, Bolivina robusta, Eggella advena, Eilohedra nipponica, Pseudorotalia gaimardii, Pseudoparrella naraensis 총 6종이다. 이들 중 가장 높은 산출빈도를 보이는 Bolivina robusta와 Pseudorotalia gaimardii의 ¹⁴C 연대측정 결과 각각 2,360±40 B.P., 2,450±40 B.P.로 나타났다. 군집분석 결과, P. gaimardii 군집, B. robusta 군집 및 A. ketienziensis-P. naraensis 군집으로 대별된다. 양쯔강 담수 유입 영향을 받는 양쯔강 앞 해역에는 P. gaimardii 군집, 쿠로시오 해류의 영향을 받는 제주도 남서해역에서 B. robusta 군집 그리고 북서측 황해 중앙부 니질대 해역에 A. ketienziensis-P. naraensis 군집이 분포한다. 이러한 저서성 유공충 군집 조성 및 분포는 약 2.5 ka BP 부터 형성되기 시작하였으며, 홀로세 후기 해수면 상승에 의한 저서 생태계 서식지 환경 변화를 반영하고 있는 것으로 생각된다.

• Ocean and Polar Research
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• 제28권2호
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• pp.67-78
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• 2006

Six surface sediments from two offshore transects of Ulsan and Gampo, on the southeastern margin of Korea were taken for sediment and foraminiferal analyses. Sedimentary processes are dominated by reworking and resedimentation from storms in the area off Ulsan and hemipelagic suspension settling in the area off Gampo. Eighty-four foraminiferal species were identified in total assemblages, including 33species of living populations and 9 species of planktonic foraminifera. The characteristics of foraminifera showed differences of offshore environments between Ulsan and Gampo. The number of living species, species diversity and equitability in Gampo offshore area had higher values than those in Ulsan offshore area. However, planktonic/benthic(P/B) ratio showed higher in the Ulsan offshore area. The species diversity indices and P/B ratio indicated that environmental stability and surface-ocean productivity in the Gampo offshore area were relatively higher than the Ulsan offshore area. The difference of species compositions is useful for interpreting the paleoenvironments in mud deposits of the southeastern margin of Korea.