• 한국환경과학회지
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• 제21권1호
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• pp.41-47
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• 2012

This study was carried out to investigate the distribution and their change of Pinus densiflora forests by climate change in Mt. Hallasan. The results showed that the areas of P. densiflora forests of Mt. Hallasan varied by region, with a total area of 1,324.3 ha, concentrated mostly in the region 1,000 m - 1,400 m above sea level. The temperate coniferous forest zone are distributed in the upper part of temperate forest zone composed of deciduous broad-leaved trees. Most of the P. densiflora forests in the lower parts were found not to be spreading because they are located close to the deciduous broad-leaved trees. However, the P. densiflora forests in the Sajebi and Pyeonggwe regions composed of the grasslands and shrub forests were found to be spreading. In addition, the altitude of the P. densiflora forests distribution increased by about 50 m and 90 m in the Sajebi and Pyeonggwe regions, respectively. The spread rate is expected to become faster than in the past due to the rate of climate change. The structure of the vegetation in Mt. Hallasan and the changes in the vegetation due to various factors need to be investigated from a long-term point of view.

• 농업과학연구
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• 제33권2호
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• pp.97-106
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• 2006

To strengthen the competitiveness of agricultural sector of the Korea, the direction of market trends on agriculture of the Malaysia was reviewed. The most dominating agricultural area in value is palm oil products, and forest products, sea products poultry products and rubber products is in order. The cultivated area of highest two top plants, oil palm and rubber, was about 4.4 million hectares in 2005, but it is decreasing year by year. Comparatively, rice field, pine apple and fruits tree cultivating area is increasing in tendency by the year. Among all the agricultural products, those items such as pork meat, poultry, egg were self-sufficient, rice, fruits, vegetables and sea products were about 70 to 80% self-sufficient, and beef meat, goat meat and milk were below 20% self-sufficient. Most of the grains, such as wheat, rice, barley, corn etc. and their processed food were imported. Also, temperate fruits such as apple, pear, and water cultivated as well as sprouting vegetables are imported. Ornamental products as cutting flowers and orchids are exported to mainly to the Singapore, but high quality temperate fruits and vegetables are imported from Australia. Oil palm exportation covers the balance of the other items imported and obtaining the foreign money as well in Malaysia.

• Ocean and Polar Research
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• 제34권1호
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• pp.65-71
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• 2012

Gambierdiscus toxicus, Adachi et. Fukuyo, is a benthic ciguatoxin-producing armored dinoflagellate, often attached to macroalgae. This organism is the primary causative agent of ciguatera fish poisoning which occurs in tropical and subtropical regions. However, regardless of the fact that the population of Gambierdiscus spp. has expanded to such temperate areas from sub-trophic and trophic areas, monitoring of G. toxicus has been lacking in the Korean coastal waters of temperate areas. This study was performed at the uninhabited Baekdo Islands off the southern coast of Korea and at Seopsom Island in the vicinity of Seogwipo, Jeju Province during April and May, 2011. Cell densities of Gambierdiscus spp. on macroalgae at Baekdo and Jeju Island ranged from zero to 56.4 cells $g^{-1}$. Maximum density was recorded on the brown alga Cladophora japonica at St. 3 of Jeju Island. In particular, the cell densities of Gambierdiscus spp. were influenced by the substrate characteristics of macroalgae. In the future, the continuous monitoring of toxic benthic dinoflagellate is necessary to predict and prevent ciguatera poisoning in Korean coastal waters.

• 한국수산과학회지
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• 제19권4호
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• pp.363-367
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• 1986

울릉도산 갯지렁이류 총 25과 53속 64종을 1) 갯지렁이의 세계적 분포를 참고로 범세계종, 북방종, 온대종 및 남방종의 4분포형으로 나누었다. 2) 범세계형이 25종으로 $39\%$였고, 북방형이 20종으로 $31\%$이고, 온대형이 19종으로 $30\%$의 순으로 나타나고 남방형은 출현되지 않았다. 3) 인접해역인 한국, 일본, 소련의 동해안 및 황해의 갯지렁이상과 비교한 결과 그 유사도는 일본${\cdot}$한국 소련 및 황해의 순이었다.

• 한국환경생태학회지
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• 제28권4호
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• pp.385-392
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• 2014

본 연구는 국내 멸종위기식물인 개가시나무의 분포 범위와 국내 자생지 내에서의 생육 특성을 파악하고자 실시하였다. 개가시나무는 참나무과에 속하는 상록활엽 교목으로서 일본, 대만, 중국, 한국 등의 따뜻한 지방에 자라는 난대성 수종이다. 국내에서는 제주도의 해발 80~350 m 내에 분포하였으며, 대부분 제주도 서남부지역의 해발 100~200m에 집중 분포하였다. 개가시나무의 수고는 평균 $9.8{\pm}1.9m$로 9~12 m 사이의 개체가 가장 많았으며, 흉고직경은 평균 $22.6{\pm}6.8$로 20~30cm의 개체가 가장 많았다. 또한 맹아지의 발생으로 다수의 분지가 형성 되었으며, 평균 $3.8{\pm}2.1$개의 맹아로 이루어졌다. 자생지 내에 분포하는 개가시나무의 96.2%에 덩굴식물이 부착되어있으며, 덩굴식물은 15과 18종으로 상록성 덩굴식물인 마삭줄의 비율이 가장 높았다. 덩굴식물이 개가시나무의 수관 형성에 미치는 영향의 정도를 분석한 결과, 9~12 m의 개가시나무에서 수관형성에 영향을 주어 고사된 가지가 확인된 개체가 가장 많았으며, 부착된 덩굴식물의 종 수가 많을수록 높은 영향을 주는 것으로 판단되었다. 따라서 자생지 내에서 개가시나무의 보존을 위해서는 이들 덩굴식물의 생육에 대한 지속적인 모니터링과 관리가 이루어져야 할 것이다.

• 한국작물학회지
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• 제31권3호
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• pp.277-285
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• 1986

인도네시아의 8개품종과 한국의 8개품종을 선정하여 계 16개품종을 인도네시아 발리(115$^{\circ}$ 14'E, 8$^{\circ}$42'S, 해발 l0m지점)와 한국 수원(126$^{\circ}$19'E, 37$^{\circ}$16'N, 해발 37m)에서 반복시험한 결과 공시품종의 출수기 및 생육형질의 변리는 아래와 같이 요약된다. 1. 16개 공시품종중 Japonica 4개품종 (레이메이, 삼남. 수원 313, 섬진)은 발리지역에서 이앙후 14~15일에 모두 출수하였으며 품종간에 조만성을 구분할 수 없었다. 2. Indica/Japonica품종(태백, 만석, 한강찰, 금강)은 수원에서 보다 발리에서 26~31일 출수가 촉진되었으며 품종간의 조차성은 양지역에서 동일한 경향을 보였다. 3. Indica의 4개품종중 3개품종(IR 36, IR 50, Semeru)은 수원에서 발리보다 출수가 26~29일정도 늦게 출수하였으며 품종간의 조만성도 양지역에서 동일한 경향을 보였으나 만생종인 Cisadane 품종은 수원에서 47일 이나 늦게 출수하여 (수원지방출수일 : 9.27일) 성숙치 못하였다. 4. Bulu 4개품종중 3개품종(Putih Gangsar, Kesambi, Putih, Jamu)은 수원에서는 출수치 않았으며 조생종인 Untup 품종은 Cisadane와 비슷한 시기에 수원에서 출수하였으나 역시 성숙치 못하였다. 5. 발리지성에서 Japonica 품종은 출수이후 수확까지 계속하여 초장이 자라났으며 수원에서 출수하지 못한 Bulu 3개 공시품종의 초장은 수원에서 예취시까지 계속하여 자랐다. Indies 공시품종은 수원과 발리에서 초장의 차리가 없었으나 Indica/Japonica및 Bulu 품종은 수원보다 발리에서 초장이 크게 나타났으며 Japonica는 수원에서 초장이 크게 자랐다. 6. 건물중은 발리지성에서 품종군간에 차리가 두드러지게 나타났으나 수원지방에서는 그 차이가 적었다.

• 한국수산과학회지
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• 제53권4호
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• pp.479-485
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• 2020

We evaluated the hatchability of fertilized eggs from six hybrid combinations of highly valued grouper species inhabiting temperate and warm waters, with the goal of establishing a novel hybrid with enhanced growth and viability during the culturing period in the temperate waters of Korea. Hybrid combinations with red-spotted grouper females exhibited high hatchability with high a fertilization and hatching rate of fertilized eggs and a low deformity rate of hatched larvae. Conversely, hybrid combinations with kelp grouper females had very low hatching rates and very high deformity rates; commercial production of seed from such crosses would be difficult without improving hatchability. The hatchabilities of convict grouper ♀×giant grouper ♂ and kelp grouper ♀×red-spotted grouper ♂ were lower than those of maternal purebreds, but these two hybrid combinations were expected to produce potentially large quantities of hatched larvae. In the above evaluation, promising hybrid combinations were identified for commercial production of seed. For these hybrids to contribute to the development of Korea's mariculture industry, mass production of fertilized eggs and seeds is necessary, along with the development of advanced rearing techniques, such as the identification of a suitable rearing temperature.

• ALGAE
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• 제28권3호
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• pp.267-280
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• 2013

The marine algal flora of the Keret Archipelago ($66^{\circ}$ N, $33^{\circ}$ E) in the White Sea, Russia was investigated during 2008. Over 250 algal records from more than 15 islands and several sites on the adjoining mainland produced a total of 62 algal species. This raised the total from 56 to 88 species of Chlorophyta (23 species), Phaeophyceae (31 species), Rhodophyta (33 species), and Tribophyceae (1 species) of which seven were new records or verifications of ambiguous records for the White Sea and 11 species are new for the Keret Archipelago. The new or confirmed records included species of Blidingia, Eugomontia, Prasiola, Rosenvingiella, and Ulothrix (Chlorophyta), Acrochaetium, Colaconema (Rhodophyta), and Vaucheria (Tribophyceae). Five species of flowering plants (Aster, Plantago, Triglochin, and Zostera) were associated with the macrophytic algal vegetation of the region. Five fucoid algae in Pelvetia, Fucus, and Ascophyllum provide a picture of a temperate flora. Regardless, the overall species richness is consistent with an arctic nature to the flora. This discrepancy is attributed to the 'filter' provided by the Barents Sea of the Arctic Ocean for post-glacial colonization of the White Sea.

• Ocean and Polar Research
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• 제23권3호
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• pp.279-284
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• 2001

The natural high productivity of temperate coastal waters in Korea can be used in advantage to reduce the feed costs for the cage-cultured marine carnivorous fish species. By using the night-lights methods an alternative of supplementary feeding strategy can be offered to the cage farmers and maintain sound environmental conditions that could enhance maximum sustainable yields. The aim of this study was to investigate the effects of night-lights which shown positive results on feeding and growth in sea cage cultured rockfish, Sebastes schlegeli. The study showed that for the water around overhead illuminated sea cage, higher zooplankton density was observed at night than during the daytime. Increased amounts of for-age, evidenced by stomach content analyses were observed in the early evening, but decreased amounts were observed in the morning and afternoon. That is, feeding activities of the fish were most intensive from midnight to dawn. In a three month feeding experiment, the results showed that night-lighted groups were superior to groups with the highest feeding efficient. This study suggested that the evidence that night-lights superimposed on only day-lights enhance growth of rockfish in sea cages during summer and winter, with timing of exposure affecting growth of juvenile fish. The capability to control the feeding behavior of marine life via manipulation and external stimuli could considerably benefit the advancement of sea cage aquaculture in coastal areas.

• Animal Systematics, Evolution and Diversity
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• 제8권2호
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• pp.243-258
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• 1992

1980년 4월부터 1992년 4월까지 우리나라의 남해연안과 여러 도서 지방의 총 69개 지역에서 채집된 해성류를 동정하였다. 그 결과 5목 8과 23종이 밝혀졌고, 이들 중 Mediaster brachiatus와 Stellaster equestris 2종은 한국 미기록종이었으며 Asterina pecitinifera는 43개 지역에서 채집되어 가장 흔한 종이었다. 대한해협과 제주도 해역에는 각각 15종의 해성류가 있었으며 온대종 15종, 열대종 7종, 한대종 3종이 분포하고 있었다. 현재까지 밝혀진 해성류는 43종이 된다.