• The Korean Journal of Ecology
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• 제14권1호
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• pp.15-23
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• 1991

The early vegetational recovery and species diversity were investigaed in burned pine forest of Mt. Todoksn from 1986 to 1990. The changes of vegetation in the burned site occurred Miscanthus→Miscanthus-Lespedeza→Lespedeza community. The biological spectra based on SD(%) and SP(%) of the burned site were similar to the unburned site with H---e type. The degree of succession(DS) was gradually increased with succession in burned site. The species diversity index(H') and evenness index(e) were declining successional trend, nut dominance index(C) inclining successional trend in the burned site. The domiance-diversity curves of the burned site showed gradual decrease in diversity and evenness, and then slopes of them were progressively steep in early successional stage.

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2003년도 학술대회
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• pp.103-107
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• 2003

Spatial distribution of phytoplankton was investigated in the southwestern sea of Korea in May 2000 in terms of phytohydrography. The sampling was done at the 0m, 30m, 50m of 15 selected stations, and permanent slides of each samples were prepared by QPS method for quantitative and qualitative analyses. Phytoplankton standing crops ranged from 3.23${\times}$10$\^$-4/ to 1.09${\times}$10$\^$-7/ cellsㆍ$\ell$$\^$-1/ in the study area. Dominant species comprised of 9 diatoms and 2 phytoflagellates, showing higher dominance of diatom and most predominance of Skeletonema costatum in all layers of most stations. Phytohydrographic results indicate that the study area might be divided into 4 categories, that is, I area is designated as neritic area where occurrence of terrestrial and coastal species is frequent, II area as intermediate area, III area as offshore area where oceanic species dominate, and IV area as other's. Especially in the II area, Skeletonema costatum was most predominant at both surface and 30m layer in most stations and represent an characteristic of northward expansion with spring massive bloom.

• 화훼연구
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• 제17권1호
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• pp.52-61
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• 2009

우리나라 내륙습지 7곳의 식물상과 군락을 조사한 결과, 우리나라 내륙습지 7곳의 식물상은 32과 49속 69종이었으며 이 중 사초과가 16종으로 23%로 나타났으며 일년생 초본식물 군락 1개와 다년생 초본식물 군락 6개 등 총 7개 군락(큰고랭이군락, 갈대군락, 줄군락, 고마리군락, 부들군락, 비녀골풀군락, 골풀군락)을 보였다. 조사습지 전체의 중요도 값이 높게 나온 우점식물은 큰고랭이, 갈대, 줄, 고마리, 부들, 비녀골풀 및 가래였다.

• Journal of Plant Biology
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• 제32권2호
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• pp.109-119
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• 1989

Adhatoda vasica Nees is a shrubby component of tropical and subtropical vegetation in Pakistan. t harbours relatively few unhealthy associated species in and around its thickets. Aqueous extracts, rain leachates, litter from shoots and soil underneath it invariably reduced germination, early growth, biomass, moisture and chlorophyll contents of Pennisetum americanum, Setaria italica, Zea mays, Brassica campestris and Triticum vulgare in different laboratory expreiments. chromatographic analysis revealed the presence of caffeic, ferulic, vanillic, p-coumaric, p-OH-benzoic, and tannic acids in aqueous extracts. The phytotoxicity was related to the test species used, part assayed and parameter measured. It is suggested that the preclusion of the associated species and the dominance of A. vasica is primarily due to allelopathy. Negative grazing also provides better chances for its establishment.

• Mycobiology
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• 제43권2호
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• pp.93-106
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• 2015

Alternaria species are common saprophytes or pathogens of a wide range of plants pre- and post-harvest. This review considers the relative importance of Alternaria species, their ecology, competitiveness, production of mycotoxins and the prevalence of the predominant mycotoxins in different food products. The available toxicity data on these toxins and the potential future impacts of Alternaria species and their toxicity in food products pre- and post-harvest are discussed. The growth of Alternaria species is influenced by interacting abiotic factors, especially water activity ($a_w$), temperature and pH. The boundary conditions which allow growth and toxin production have been identified in relation to different matrices including cereal grain, sorghum, cottonseed, tomato, and soya beans. The competitiveness of Alternaria species is related to their water stress tolerance, hydrolytic enzyme production and ability to produce mycotoxins. The relationship between A. tenuissima and other phyllosphere fungi has been examined and the relative competitiveness determined using both an Index of Dominance ($I_D$) and the Niche Overlap Index (NOI) based on carbon-utilisation patterns. The toxicology of some of the Alternaria mycotoxins have been studied; however, some data are still lacking. The isolation of Alternaria toxins in different food products including processed products is reviewed. The future implications of Alternaria colonization/infection and the role of their mycotoxins in food production chains pre- and post-harvest are discussed.

• 한국수산과학회지
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• 제50권5호
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• pp.553-560
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• 2017

Fluctuations in the abundance and species composition of fishes in the coastal waters of Geumo-do, Yeosu, Jeollanam-do, Korea were investigated from 2002 to 2005. A gill net with entrances on both sides was used to collect a total of 469 individuals (55,180 g) of 3 orders, 18 families, and 28 species. The dominant species was Sebastes inermis (60 individuals, 5,670 g), followed by Neoditrema ransonneti (46 individuals, 2,290 g), and Pseudaesopia japonica (38 individuals, 3,080 g). The highest number of individuals was found in 2004, while the biomass was highest in 2005. The diversity index was highest in 2004 (H'=2.703) and lowest in 2002 (H'=2.580). The dominance index was highest in 2004 (D=3.983) and lowest in 2002 (D=3.404). The richness index was highest in 2003 (RI=0.337) and lowest in 2002 (RI=0.261). Changes in temperature and salinity affected the community structure and the location of spawning grounds. The number of individuals and total biomass increased with changes in temperature and salinity each year.

• 수산해양기술연구
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• 제51권4호
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• pp.484-492
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• 2015

The purpose of this study is to compare the ichthyofauna between the eelgrass bed waters located in the open sea and the nearby sea free of eelgrass, and this study collected a total of 26 species. Comparing the fish collected on the eelgrass bed (St.2) of Geomun-do coast with the fish collected on the coastal waters (St.1) void of the nearby eelgrass bed, the fish collected from the eelgrass bed included 19 species, 413 individual with 16,110.6g in weight while the fish collected from the coastal waters void of the eelgrass bed included 19 species, 290 individuals with 12,961.5g in weight. Accordingly, it was found that the population size and biomass of the fish collected from the eelgrass bed were higher than the coastal waters void of the eelgrass. This study could identify that diversity, richness, evenness index except dominance were also much higher even in the result of cluster analysis.

• 한국자원식물학회지
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• 제21권3호
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• pp.216-221
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• 2008

The Purpose of this study was to offer the raw data for drawing up the conservation plan by analysing natural vegetation in Midongsan, Chungcheongbuk-do, Korea. The period of survey was from July to October, 2004 and the size of plot was 100$m^2$. In the results of analyzing the physical environments, the range of altitude was 303${\sim}$550m and soil pH was 5.4${\sim}$6.8. The angle of slope was 3${\sim}$57% and topographical factor was composed of ridgeline. In the results of analyzing a importance percentage, the dominant species in tree layer, Pinus rigida, P. densiflora, Quercus mongolica, Q. variabilis and Q. acutissima, P. rigida, Q. mongolica, Q. acutissima, Platycarya strobilacea and Q. variabilis in subtree layer, Rhododendron mucronulatum, Symplocos chinensis for pilosa, Lindera obtusiloba, L. erythrocarpa, Rhus trichocarpa and Weigela subsessilis in shrub layer. In the results of species diversity index, species diversity (H') was from 1.2401 to 2.5540, maximum species diversity (H'max), from 1.9459 to 2.8904, evenness (J'), from 0.5644 to 0.8836, dominance (D), from 0.1164 to 0.4356.

• Journal of Ecology and Environment
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• 제46권1호
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• pp.8-17
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• 2022

Background: Parthenium hysterophorus L. (Asteraceae; hereafter Parthenium) is an invasive alien species of global significance because of its' negative ecological and socioeconomic impacts. This species is spreading rapidly from lowland Tarai to Middle Mountain regions in Nepal. In the present study, we analyzed the impacts of Parthenium on plant community composition including their soil seedbank in subtropical grasslands located in central Nepal. Data was collected in a 10 m long transects passing through areas of high (> 90% cover), medium (40%-60%) and low (< 10%) levels of Parthenium cover using a plot of 1 m². Altogether, we sampled 90 plots in 30 transects. Seedling emergence method was used to estimate soil seedbank density in the soil samples (0-10 cm depth) collected from the plots with high Parthenium cover. Results: There was no significant difference in the plant species richness at different levels of Parthenium invasion whereas there was a significant change in the species composition of above ground flora due to Parthenium invasion. There was also a significant difference in species composition between soil seedbank and aboveground flora in the highly invaded plots. Parthenium was the most dominant in soil seedbank, contributing 65% to the total soil seedbank. Conclusions: Our study suggests that Parthenium has considerable negative impact on the native grassland flora, and the dominance of Parthenium in the soil seedbank means there is a challenge for its management. It also suggests the need of monitoring the soil seedbank dynamics while managing Parthenium weed.

• 한국어류학회지
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• 제19권4호
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• pp.332-342
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• 2007

이 연구는 경상북도 울진 연안 해역에서 2002년 1월, 4월, 7월 및 10월까지 계절별로 총 4회에 걸쳐 만조시에 채집된 부유성 난 자치어의 종조성, 양적변동을 연구하였다. 연구기간 동안 채집된 부유성 난은 총 7개 분류군이 출현하여 멸치, 정어리, 까나리, 참가자미속 어류, 앨퉁이, 보리멸, 기타 난 등으로 분류되었고, 출현량을 보면, 멸치 난이 연구기간 동안 출현한 부유성 난의 38.34%를 차지하여 가장 우점도가 높았으며, 보리멸 난이 25.84%를 차지하였다. 연구기간 동안 출현한 자치어는 총 7목 18과 25개의 분류군이 출현하였고, 멸치가 연구기간 동안 출현한 자치어의 90.46%를 차지하여 최우점종이었으며, 다음으로 조피볼락이 자치어의 2.04%를 차지하였다. 이들 2종이 차지한 비율은 92.49%이었으며, 나머지 23개 분류군은 7.51%를 차지하였다. 2002년 울진에서 계절별 종 다양도지수(H')는 0.0878~2.3855였고, 균등도지수는 0.0451~0.9300로 나타났다. 우점도의 경우는 0.3000~0.9914로 종 다양도지수와 균등도지수와는 반대 경향을 보였다. 정점별로 분석한 종 다양도지수는 0.3035~0.7440으로 정점 2에서 가장 낮은 값을 나타냈고, 정점 1에서 가장 높은 값을 보였다. 우점도의 경우는 0.8919~0.9669로 종 다양도지수와 균등도지수와는 반대 경향을 보였다. 계절별 군집의 유사도는 여름과 가을에 상대거리 차(0.010)가 가장 적어 군집상이 매우 유사하였고, 정점별로는 정점 1과 정점 4에서 가장 적은 상대거리 차(0.014)를 보여 군집상이 매우 유사하였다.