• Animal Systematics, Evolution and Diversity
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• 제24권1호
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• pp.115-127
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• 2008

A taxonomic study on the genus Nitakra (Ameiridae) is accomplished. A total of five species are collected from coastal marshes, lagoons, and estuaries in South Korea. Among them, the latter three species are newly recorded from Korea: N. spinipes Boeck, N. affinis califarnica Lang and N. pietschmanni (Chappuis). Taxonomic accounts and a key to the species from Korea are given.

• 한국습지학회지
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• 제9권2호
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• pp.21-31
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• 2007

하구습지는 육지생태계와 해양생태계가 만나는 전이적 특성으로 인해 다른 생태계에 비해 겨울철새를 비롯한 많은 생물종이 도래 서식하고 있음에도 불구하고, 지금까지 하구습지에 대한 공간적 분포나 시간에 따른 하구습지 변동추이를 분석한 연구는 미흡한 실정이다. 이에 본 연구에서는 지리정보시스템을 이용하여 한강, 섬진강, 가화천의 하구습지를 파악하였으며, 이때 구한말 이후 일관되게 제작되는 국가기본지형도를 이용함으로서 표준화된 방법으로 하구습지의 시대별 변화추이를 분석하였다. 특히 1910년대 제작된 고지형도와 1970년대, 그리고 2000년대에 제작된 지형도를 획득하여, 하구 내 갯벌, 습지, 모래에 대한 공간분포와 하구별 하구습지의 훼손실태를 파악하였다. 한강 및 영산강 하구와 같이 대하천 하구는 1910년대부터 1970년대까지 지속적으로 습지면 적이 감소되었으나, 감소율은 크지 않았다. 그러나 1970년대 이후 하구둑 건설과 영산강유역종합개발계획 등 각종 개발사업이 이루어진 영산강의 하구습지는 급격히 감소하였으며, 한강 하구도 남북긴장 완화와 접경지역 개발지원에 따라 습지훼손이 심화되고 있다. 반면 하구둑이나 주변 개발사업으로부터 비교적 자유로운 가화천은 하구습지의 훼손이 낮은 상태인데, 아직도 1910년대와 비슷한 형태의 갯벌과 갯골을 간직하고 있다.

• 농촌계획
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• 제7권1호
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• pp.61-76
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• 2001

During the performance of large scale tidal land reclamation project along the coast line, the construction of large scale structures such as sea-dikes, closing estuaries will induce big changes of near-shore hydraulic behavior. In this paper, its is aimed to verify the change of tide and currents after the construction of sea-dike of the Saemangeum project along the coast line. Numerical scale model "TRISULA" which development by Delft Hydraulics in the Netherlands was used. "TRISULA" is adopting the finite difference numerical scheme, and mostly using for hydro-dynamic solution along the sea and estuaries. Model boundary is covering $100{\times}170$ Km and constructed with $133{\times}337$ grids. Outer side boundary is divided 48 sections, and input 37 tidal components are gained from another big scale numerical "Yellow Sea" model. Model calibrations & verifications were performed th field tide & current datas which were measured along sea-dike alignment during Aug. $1997{\sim}Apr$. 1999. And then, numerical simulation with the tide condition dated 17 Apr. 1999 was performed with & without sea-dike construction condition for the comparison. Evaluated boundary is 20 km out-side from sea-dike alignment. Four cross lanes were set up, each of lane contains 3 points, for the comparison of sea-dike construction effects. Results showing the tidal amplitude is reducing approximately 20 cm after the construction of sea-dike during spring tide condition, amplitude 6.9m. Currents after construction of sea-dikes along the alignment, the northern part shows 50%(inner), 90%(outer) and the southern part shows 10%(inner) 50%(outer) of the currents before construction.

• ALGAE
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• 제29권3호
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• pp.227-235
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• 2014

The red seaweed, Gracilaria tikvahiae McLachlan, was cultivated in open water farms in urbanized estuaries of Long Island Sound (26-30 psu of salinity) and New York City (20-25 psu), USA in 2011. Plants were harvested monthly from summer (August, $24^{\circ}C$) to fall (November, $13^{\circ}C$) and analyzed for total nitrogen, protein, and amino acid content. On a dry matter (DM) basis, nitrogen and protein significantly increased over the harvest period until October and then plateaued. Nitrogen increased from $22{\pm}1g\;kg^{-1}$ DM in August to $39{\pm}3g\;kg^{-1}$ DM in October (p < 0.001). Protein increased from $107{\pm}13g\;kg^{-1}$ DM in August to $196{\pm}5g\;kg^{-1}$ DM in November (p < 0.001). With two exceptions, amino acid concentrations expressed on a crude protein (CP) basis were similar over the harvest period. Essential amino acids accounted for $48{\pm}1%$ of all amino acids present with lysine and methionine averaging $56{\pm}2g\;kg^{-1}$ CP and $18{\pm}1g\;kg^{-1}$ CP, respectively. Histidine was underrepresented among essential amino acids and averaged $13{\pm}1g\;kg^{-1}$ CP. Taurine ranged from 2.1 to $3.2g\;kg^{-1}$ DM. With its moderate levels of lysine, methionine and taurine, ocean farmed G. tikvahiae has the potential of overcoming many nutrient deficiencies currently associated with terrestrial plant ingredients in alternative feeds for fish and shrimp.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2001년도 춘계 수산관련학회 공동학술대회발표요지집
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• pp.437-438
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• 2001

Species of the genus Pseudodiaptomus are reported as the major constituents in the fresh or brackish waters in the northeastern Asia (Suh et al., 1991; Oka et al., 1991). Of these species, P. inopinus (Burckhardt) and P. poplesia (Shen) are particularly numerous in spring and autumn (Suh et al., 1991; Shen and Song, 1979). Recently. we found a presence of two types of Pseudodiaptomus inopinus during the course of investigation on zooplankton from Korean estuaries. (omitted)

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.319-322
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• 2003

Integrated coastal management (ICM) requires robust indicators that gauge the 'health' of the coast in relation to environmental, social and economic activities. Biological indicators(bio-indicators) offer a signal of the biological condition in an ecosystem. Using bio-indicators as an early warning of pollution or degradation in an ecosystem can help sustain critical resources. This review examines the rationale and value of selecting species as bio-indicators of human induced changes within estuaries, using examples from both the western and southern coast. It include a range of biological parameters relating to particular species, groups of species and biological processes. The use of these indicators is critically reviewed and the presence or absence of a relevant framework for their use in Korean ICM programs is discussed.

• Fisheries and Aquatic Sciences
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• 제11권1호
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• pp.32-35
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• 2008

The Suminoe oyster, Crassostrea ariakensis, occurs in estuaries where rivers meet seawater. In Korea, it is one of the most popular fisheries resources in the Nam River and Sumjin River. However, the genetic identification of this species has been questioned, because specimens are often mis-identified as other species. To identify the species, we conducted polymerase chain reaction (PCR) amplification of the internal transcribed spacer-1 (ITS-1) region, followed by digestion with the restriction enzyme HaeIII. Restriction profiles for oysters collected from Korea, Japan, and China (north and south) were determined by comparing the PCR-restriction fragment length polymorphism (RFLP) patterns of the ITS-1 regions. Our study verified that the oysters collected from Korea were C. ariakensis based on the PCR-RFLP patterns. These results emphasize the value of molecular markers for identifying morphologically uncertain species.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2000년도 추계수산관련학회 공동학술대회발표요지집
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• pp.169-170
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• 2000

Phytoplankton communities are generally dominated by diatoms in spring and changed to nano- and picoplankton or dinoflagellates groups in summer (Anderson et al., 1994). Many phytoplankton investigators have been used to chlorophyll a as a phytoplankton biomass, as all the phytoplankton contain (Cullen, 1982). The studies of population compositions, primary productivity, chlorophyll a of phytoplankton in the Yellow Sea have been conducted mainly in bays and estuaries with a few studies in the central area of Yellow Sea. This study is to understand the relationship between the environmental factors and cholrophyll a concentration of phytoplnakton in terms of the area and depth in the Yellow Sea and also to identify the characteristics of phytoplankton populations occurring at the most productive periods throughout the yera.

• Animal Systematics, Evolution and Diversity
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• 제23권2호
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• pp.135-154
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• 2007

Eight calanoid species of 4 genera in 4 families are reported from the various brackish waters such as estuaries, brackish-water lakes, and coastal marshes in South Korea. Among them, Eurytemora affinis (Poppe) and Acartia (Acanthacartia) tsuensis Ito are newly added to Korean copepod fauna. Collection data, brief descriptions, illustrations and distribution maps for the eight species are prepared. A key to the genera and species of the brackish-water calanoids from Korea is also presented.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2002년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.191-197
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• 2002

The prediction of the dynamic behaviors of buoyant water discharges into a large volume of water bodies, the flows of water accompanying the density differences due to temperature differences and sometimes also to salinity differences, have attracted great concern over several decades. Heated water surface discharges from power plants and freshwater discharges in estuaries are typical examples of the buoyant flows. (omitted)