• 한국환경생태학회지
• /
• 제18권4호
• /
• pp.351-358
• /
• 2004

본 연구는 서울 강북지역 중 중구, 용산구, 성동구, 서대문구, 마포구의 5개구. 총면적 90.15$\textrm{km}^2$를 대상으로 우리나라 도시지역에서 번성하는 귀화종인 서양등골나물(Ageratina altissima)군락 분포현황 및 특성을 규명하고자 수행하였다. 연구대상지내 서양등골나물군락의 총 분포면적은 1,860,805$m^2$이었으며 남산을 포함하고 있는 용산구(23.7%)와 중구(13.7%)에 가장 넓게 분포하고 있었다. 현존식생유형별 분포현황을 살펴보면 서양등골나물군락은 아까시나무림 하부에 주로 분포하였으나 남산만은 소나무림에서 분포면적이 넓은 것이 특징이었다. 단위면적 당 분포비율은 전체지역에서는 잣나무림이 가장 높았으나 남산을 제외하면 아까시나무림과 조경수식재지가 대부분을 차지하고 있었다. 수관피복율에 따른 분포경향은 교목층과 아교목층은 수관피복률이 높아질수록 분포비율이 높았고 특히 수관피복률 50% 이상인 지역에서 분포 비율이 높았다. 경사향과의 관계에서는 전반적으로 서향에서 넓게 분포하고 있는 것으로 분석되었다. 따라서 서양등골나물군락은 수관형성이 양호한 서사면 아까시나무림의 하부에서 주로 분포하고 있는 것으로 분석되었고 단층구조 소나무림으로의 식생관리지역에서는 서양등골나물군락이 확산되는 것으로 분석되었다. 추후 서양등골나물군락의 생육을 억제하기 위해서는 장기적으로 아까시나무림을 자생의 다층구조 낙엽활엽수군락으로 개선하는 시도가 이루어져야 할 것으로 판단되었다.

• 식물분류학회지
• /
• 제49권3호
• /
• pp.261-264
• /
• 2019

서양등골나물은 우리나라에서 생태계 교란 생물로 지정된 외래 침입종이다. 북아메리카 동부지역이 원산지인 이 외래 식물에 대해 각각 2개의 학명(Eupatorium rugosum Houtt., Ageratina altissima (L.) R. M. King & H. Rob.)과 국명(서양등골나물 및 미국등골나물)이 혼용되고 있어 분류학적 혼란을 초래하고 있다. 이 논문에서는 이들의 분류학적 실체와 내력을 밝혀 분류학적 혼란을 해결하고자 하였다. 조사 결과, 미국등골나물과 서양등골나물은 동일한 분류군으로서 린네가 Species Plantarum에 Ageratum altissimum으로 처음 기재한 종이다. 이 종은 Eupatorium속으로 전이되어 대체명이 공표되고 이후 Ageratina속으로 전이되었다. 즉, Eupatorium속에서는 전혀 다른 기준표본에 근거해 이미 존재하였던 E. altissimum L. 때문에 대체명으로 E. rugosum이 공표되었고, Ageratina속에서는 종소명 'altissima'를 사용하고 있던 종이 없었기 때문에 원명에 근거해 A. altissima의 학명이 공표되었다. 이러한 과정에서 발표된 이름들이 국내에서는 서로 다른 분류군으로 인식되면서 분류학적 혼란이 야기된 것으로 사료된다. 형태 및 분자 형질을 분석한 연구 결과에 근거해 서양등골나물의 정명은 A. altissima이다.

• Animal cells and systems
• /
• 제5권4호
• /
• pp.309-312
• /
• 2001

Allozyme studies have been widely used to estimate genetic variation and to describe genetic structure in natural populations. In many cases, the genetic diversity of recently established populations is generally lower than that of central populations. In addition, the genetic composition of an invasive species is influenced by its History of introduction as well as its ecological characters. Ageratina altissima (L.) R. King & H. Robinson (white snakeroot) is a perennial herb native to the eastern United States and Canada, and is currently receiving much attention for its rapid invasion of the Korean forests. Starch gel electrophoresis was used to assess the genetic variability at 11 putative loci in seven introduced populations of A. altissima in Seoul. Populations of A. altissima maintained lower levels of allozyme diversity (expected heterozygosity = 0.063) than those reported for other taxa with similar ecological traits. The degree of differentiation observed among A. altissima populations was considerably low. It is suggested that the populations were recently established from only a few founders via dispersal by human activities, resulting in the loss of genetic variation.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 2001년도 한국생물과학협회 학술발표대회
• /
• pp.153.1-153
• /
• 2001

No Abstract, See Full Text

• Animal cells and systems
• /
• 제7권3호
• /
• pp.197-205
• /
• 2003

White snakeroot (Ageratina altissima (L.) R. King & H. Robinson) as an invasive alien plant appeared more abundantly at lower elevations where frequent artificial interferences prevailed than at higher elevations where such impacts were less. They appeared abundantly in introduced forests such as black locust plantation but they did not appear or were rare in natural forests such as oak forest. But an exceptional phenomenon where white snakeroot did not appear was found in a Korean pine stand with dense cover afforested recently. Appearance status of white snakeroot in each section of trampling path depended on breadth of the path and relative light intensity. Growth of white snakeroot measured as the number of ramet per genet, height, and biomass was better near the trampling path and was reduced toward the forest interior. The growth was proportionate to the relative light intensity measured according to distance from the trampling path. Such results support the fact generally known in relation invasion and expansion of the invasive alien plants. From this viewpoint, we suggest a management plan that applies ecological restoration principles to address ecosystems infected with white snakeroot by restoring the integral feature of the degraded nature and more thoroughly conserving the remaining nature.

• 한국농림기상학회지
• /
• 제16권3호
• /
• pp.227-232
• /
• 2014

서양등골나물(Ageratina altissima)은 우리나라의 육상생태계를 교란시키는 외래종으로 알려져 있다. 교란 지역으로부터 그늘이 지는 숲 속으로 침입하는 것으로 알려져있으나, 한국에서 나타나는 서양등골나물의 분포 특성에 대해서는 양지와 음지에 대한 다양한 보고가 있다. 본 연구는 서울 우면산을 대상으로 광도 및 토양 특성과 서양등골나물의 분포의 관계, 등산로 주변 서양등골나물 분포 양상을 살펴보았다. 서양등골나물의 분포는 상대광도가 증가함에 따라 증가하고, 낙엽층이 깊어지면 감소하는 것으로 나타났다(p < 0.001). 서양등골나물은 우면산에서 주로 등산로 주변에서 분포하고 있었으며, 특히 등산로로부터 숲으로 10m 이내에 대부분이 분포하고 있었는데(p < 0.01), 이 지역은 빛과 임상 상태가 서양등골나물에게 유리한 지역이었다. 서양등골나물은 계곡보다는 능선에서 더 많이 분포하였으며, 지형에 따른 차이는 등산로로부터의 거리 10m를 전후로 한 9m, 12m 위치에서 가장 컸다(p < 0.05). 토양의 수분함량, 석력함량, pH 등은 서양등골나물의 분포와 뚜렷한 상관관계를 보이지 않는 것으로 나타났으며, 이는 서양등골나물이 다양한 토양 환경에 대한 적응성을 가지고 있다는 것을 알려주었다. 본 연구는 등산로가 외래종의 침입에 취약한 지역임을 보여주었으며, 향후 등산로 관리에서 외래종의 침입에 대한 대책의 필요성을 알려주었다.

• 한국자원식물학회지
• /
• 제34권6호
• /
• pp.616-632
• /
• 2021

We performed taxonomic reviews and habitat circumstances survey for 41 un-introduced environmentally harmful plants (as designated by the Ministry of Environment, Korea in 2016). And we investigated plant specimens from several herbaria and performed a field survey in the southeastern region of the United States. Based on the result, we presented the most comprehensive results of weed risk evaluation and taxonomic description up to now as well as classification keys for 11 species to apply the regulation management of putative invasive alien species - Senecio madagascariensis Poir., Sphagneticola trilobata (L.) Pruski, Ageratina riparia (Regel) R.M. King & H. Rob. (Asteraceae), Andropogon gayanus Kunth (Poaceae), Echinocystis lobata (Michx.) Torr. & A. Gray (Cucurbitaceae), Salvinia minima Baker (Salviniaceae), Vincetoxicum rossicum (Kleopow) Barbar. (Asclepiadaceae), Asparagus asparagoides (L.) Druce (Asparagaceae), Alternanthera pungens Kunth (Amaranthaceae), Salpichroa origanifolia (Lam.) Thell., and Lycium ferocissimum Miers (Solanaceae).

• Journal of Ecology and Environment
• /
• 제47권3호
• /
• pp.75-84
• /
• 2023

Background: Knowledge of the spatial trends of plant invasions in different habitats is essential for a better understanding of the process of these invasions. We examined the variation in invasive alien plant species (IAS) richness and composition at two spatial scales defined by elevation and habitat types (roadside, forest, and cultivated lands) in the Makawanpur district of Nepal. Following an elevation gradient ranging from 500 to 2,400 m asl along a mountain road, plant species cover was recorded within sample plots of size 10 m × 5 m. Systematic random sampling was adopted in every 100 m elevation intervals on three habitat types. Results: Altogether 18 invasive alien plants belonging to eight families were recorded within 60 plots, of which 14 species (representing 80%) were from tropical North and South America. The most common plants by their frequency were Ageratina adenophora, Chromolaena odorata, Bidens pilosa, Lantana camara, and Parthenium hysterophorus. We found a significant relationship between species composition and elevation in the study area. Low-elevation regions had a higher number of alien species as compared to high-elevation regions within different habitat types. Conclusions: The species richness and density of IAS were higher in the road site followed by the cultivated land and forest sites. This pattern occurred throughout the elevation range and habitats. IAS were found mostly in the open land with high sunlight availability. Information from such scientific assessment of invasive alien plants will assist in developing appropriate management plans in the Makawanpur district.

• Journal of Microbiology and Biotechnology
• /
• 제19권12호
• /
• pp.1628-1634
• /
• 2009

Small heat shock proteins (sHSPs) function as molecular chaperones that protect cells against environmental stresses. In the present study, the genes of hsp17.6 and hsp17.7, cytosolic class I sHSPs, were cloned from a tropical plant, Ageratina adenophorum. Their C-terminal domains were highly conserved with those of sHSPs from other plants, indicating the importance of the C-terminal domains for the structure and activity of sHSPs. The recombinant HSP17.6 and HSP17.7 were applied to determine their chaperone function. In vitro, HSP17.6 and HSP17.7 actively participated in the refolding of the model substrate citrate synthase (CS) and effectively prevented the thermal aggregation of CS at $45^{\circ}C$ and the irreversible inactivation of CS at $38^{\circ}C$ at stoichiometric levels. The prior presence of HSP17.7 was assumed to suppress the thermal aggregation of the model substrate CS. Therefore, this report confirms the chaperone activity of HSP17.6 and HSP17.7 and their potential as a protectant for active proteins.

• Journal of Forest and Environmental Science
• /
• 제39권2호
• /
• pp.105-117
• /
• 2023

Climate change and invasive alien plant species (IAPs) are having a significant impact on mountain ecosystems. The combination of climate change and socio-economic development is exacerbating the invasion of IAPs, which are a major threat to biodiversity loss and ecosystem functioning. Species distribution modelling has become an important tool in predicting the invasion or suitability probability under climate change based on occurrence data and environmental variables. MaxEnt modelling was applied to predict the current suitable distribution of most noxious weed A. adenophora (Spreng) R. King and H. Robinson and analysed the changes in distribution with the use of current (year 2000) environmental variables and future (year 2050) climatic scenarios consisting of 3 representative concentration pathways (RCP 2.6, RCP 4.5 and RCP 8.5) in Bhutan. Species occurrence data was collected from the region of interest along the road side using GPS handset. The model performance of both current and future climatic scenario was moderate in performance with mean temperature of wettest quarter being the most important variable that contributed in model fit. The study shows that current climatic condition favours the A. adenophora for its invasion and RCP 2.6 climatic scenario would promote aggression of invasion as compared to RCP 4.5 and RCP 8.5 climatic scenarios. This can lead to characterization of the species as preferring moderate change in climatic conditions to be invasive, while extreme conditions can inhibit its invasiveness. This study can serve as reference point for the conservation and management strategies in control of this species and further research.