• International Journal of Industrial Entomology and Biomaterials
• /
• 제6권2호
• /
• pp.125-132
• /
• 2003

Uzi fly (Exorista bombycis Louis) is one of the major larval endo-parasitoid of silkworm (Bombyx mori). It causes extensive damage to sericulture industry. The application of synthetic organic pesticides has tremendous impact on minimizing pest population but their overuse and frequent misuse and high sensitivity towards the silkworms, has forced the entomologists to search for alternatives to chemical control, which is safe to silkworm, environment and farm workers. Biological control continues to offer exciting possibilities for the control of fly pest population. It is environmentally safe alternative to chemical control and offering a long-term protection. Several potential hymenopteran parasitoids have been screened. Among successful natural enemies, Nesolynx thymus, Trichomalopsis apanteloctena, Trichopria sp., Brachymeria lasus, Pediobius sp., Spalangia sp., Spilomicrus karnatakensis and Dhirhinus sp. are important. It is essential to predict accurately the efficacy of these natural enemies in a new habitat prior to its introduction. The important desirable attributes of these potential parasitoids viz., host searching capacity, specificity, power of increase and fitness and adaptability of the parasitoid in new environment has been recorded. Results of the host parasitoid interaction indicate that the aging of the host function as a factor that influence the host finding efficiency of the parasitoid. It is highly scored with 15-20 hrs old pupa of the host. However, aging of the parasitoid does not significantly affect it. The sex ratio is female biased which is advantageous from biological control point of view, Biological suppression methods involving conservation and utilization of natural enemies have been discussed in detail.

• Journal of Forest and Environmental Science
• /
• 제33권3호
• /
• pp.239-242
• /
• 2017

Although camera traps have been widely used to understand the abundance of wildlife in recent decades, the effort has been restricted to small sub-set of wildlife which can mark-and-recapture. The Random Encounter Model shows an alternative approach to estimate the absolute abundance from camera trap detection rate for any animals without the need for individual recognition. Our study aims to examine the feasibility and validity of the Random Encounter Model for the density estimation of endangered leopard cats (Prionailurus bengalensis) in Maekdo riparian park, Busan, South Korea. According to the model, the estimated leopard cat density was $1.76km^{-2}$ (CI 95%, 0.74-3.49), which indicated 2.46 leopard cats in $1.4km^2$ of our study area. This estimate was not statistically different from the previous leopard cat population count ($2.33{\pm}0.58$) in the same area. As follows, our research demonstrated the application and usefulness of the Random Encounter Model in density estimation of unmarked wildlife which helps to manage and protect the target species with a better understanding of their status.

• The Journal of Asian Finance, Economics and Business
• /
• 제10권1호
• /
• pp.57-66
• /
• 2023

There is a strong association between poverty levels and the probability of natural disasters. East Java, however, exhibits a distinct pattern. While the rate of poverty is declining, natural disasters are becoming more severe. Considering that East Java is an area with a high risk of natural disasters and a high poverty rate, this study aims to estimate the effect of environmental preservation and the magnitude of the impact of disasters as measured by the Disaster Risk Index (IRBI) on poverty. The 3SLS model is used on secondary data from 38 districts/cities from 2015 to 2021 as an analytical database. Based on the estimation results, there are 3 findings in this study: (i) the role of government, population development, and economic activity have a strong influence on nature conservation; (ii) nature conservation has a strong influence on disaster risk; and (iii) the disaster risk index has a strong effect on poverty. As a result, areas with a high level of disaster risk have a slower rate of poverty reduction. The role of this research is to show the need for the government's role in improving the quality of natural disaster mitigation anticipation, economic activity, and the role of the population in a sustainable manner.

• 한국환경과학회지
• /
• 제32권12호
• /
• pp.943-953
• /
• 2023

This study analyzed the ecological characteristics of the wetland protection area at tthe Nakdong River through vegetation and biota surveys, which showed that brackish water meets fresh water, a unique ecological environment has been created, biodiversity is high, and diverse habitats are distributed. Eleven plant communities, including four woody communities and seven grass communities, are distributed along the coast, and a total of 514 species, including 11 endangered wildlife species, were identified in terms of species diversity. Among them, the species diversity of the Eulsuk-do area was found to be relatively higher than that of other Barreir Islands areas. The presence of a population of Sterna albifrons on Sinja-do and a population of Eremias argus on Jinwo-do, an area outside the boundaries of the wetland protection area, confirmed the conservation value of the wetlands and the need to expand the boundaries of the wetland protection area. It is judged that this information can be used as basic information for a systematic conservation and management plan for the wetland protection area at the Nakdong River Estuary and as basic data to support the establishment of a policy.

• 한국산학기술학회논문지
• /
• 제21권9호
• /
• pp.39-48
• /
• 2020

본 연구는 1960 ~ 1990년대라는 시간의 경과에 따라 나타나는 서울시 도심 계획 방식의 변화를 살펴보고 도시보전의 형성 과정을 살펴보는 것을 목적으로 한다. 분석결과, 먼저, 근대화와 도시화 등이 미친 서울시 도심 계획의 변화로 과잉 인구 문제로 인한 도심 기능의 분산 정책을 시도한 1960년대부터 강남 개발에 따른 도심의 기능 분산 정책을 추진한 1970년대, 국제이벤트와 경제성장을 이유로 기존의 도심에서 부도심으로 기능이 이전한 1980년대, 정도 600년 기념사업과 기존 도심의 역사성을 인식하게 된 1990년대까지 서울시 도심 계획의 변화를 중심으로 살펴보았다. 다음으로 시간의 경과에 따라 서울시 도심 계획에서 나타난 도시 보전의 형성 과정을 살펴보면 첫째, 기존의 건물과 가로시설물이라는 물리적 측면을 유지하였고 둘째, 문화재 주변 지역의 규제라는 공간적 측면의 유지를, 셋째, 북촌, 인사동 등 역사적 장소에 대상으로 한 공공 부문 참여인 공간적 측면의 관리를 시도하였으며, 넷째, 서울시민들에게 익숙한 장소들의 접근성을 개선한 사회적 측면의 관리 등으로 도시 보전의 개념이 물리적 - 공간적 - 사회적 측면의 순으로 형성되고 있음을 알 수 있었다.

• 식물분류학회지
• /
• 제37권2호
• /
• pp.115-129
• /
• 2007

제주도에 자생하는 희귀식물종인 황근(아욱과) 3개 집단을 대상으로 ITS 염기서열 변이와 ISSR 변이를 분석하는 방법으로 유전적 다양성을 조사하였다. 집단 1(북제주군 하도리 집단)에 포함된 18개체의 ITS 염기서열을 분석한 결과 총 14개 지점(다형 뉴클레오티드까지 포함하면 17개 지점)에서 뉴클레오티드 변이가 관측되었으며, 각 개체들은 최소 1개에서 최대 13개 뉴클레오티드 지점에서 염기서열의 차이를 보였다. 그러나 집단 2(남제주군 오조리 집단) 17개체와 집단 3(남제주군 세화리 집단) 17개체의 ITS 염기서열은 모두 동일한 것으로 확인되었다. ISSR 변이분석 방법에 의해 생산된 자료를 분석한 결과 역시, 집단 1이 집단 2와 3에 비해 상대적으로 더 높은 유전적 다양성 지표들을 나타내었다. 이와 같은 결과는 집단 2와 3의 형성 과정에서 극심한 유전적부동이 존재했었으며, 이후 인접 집단으로부터 이들 집단으로의 유전자 유입이 매우 제한적이었던 반면, 집단 1은 오랫동안 개체군이 안정적으로 유지되어왔기 때문으로 해석되었다. 우리나라에 자생하는 황근을 보존하기 위해서는 유전적 다양성이 월등히 더 높은 하도리 집단을 우선적으로 보존하는 것이 매우 중요하며, 만일 현지외 보존이 필요할 경우 하도리 집단에 포함된 개체를 집중적으로 활용하는 것이 더 효율적일 것으로 판단된다.

• 한국환경복원기술학회지
• /
• 제4권2호
• /
• pp.52-61
• /
• 2001

At least, there are intense pressures on the natural habitats from various disturbance, including urbanization, extension of industrial area, and road construction. These human land use result in fragmentation of landscape and natural habitat. The ecological consequences of habitat fragmentation include the direct effects of habitat loss and the indirect effects of reduced inter-patch dispersal. The decline of biological diversity has been rapidly declined by the habitat loss and fragmentation. Conservation strategists should consider not only the habitat amount of that must be preserved, but also the spatial configuration of habitat across the landscape. But, the paucity of available data for most species forces landscape ecologists to develop the concept, model, and theory. The developed theories are often misused in academic papers and practical applications. The development history, presumption of concept, model, theory is ignored. This tendency have leaded to failure of landscape restoration and the use of theory in conservation practice have come under increasing attacks. This paper will highlight the ecological theory that have proven the most influential in landscape ecology, restoration and conservation : the theory of island biogeography, the theory of nested subset analysis, minimum viable population(MVP), the theory of metapopulation dynamics. And, it find the problem and usefulness of four theory in application to real world. Consequently, the understanding of theoretical implication about landscape ecological theory is required. We must carefully apply the theory after examining the problem and availability of various theory because of no existence of only one general theory.

• 한국습지학회지
• /
• 제11권2호
• /
• pp.99-106
• /
• 2009

물거미(Argyroneta aquatica Clerck)는 전세계적으로 희귀한 거미로 물속에서 생활사를 보낸다. 우리나라에서는 경기도 연천군 은대리의 소규모 습지에서만 발견되고 이곳은 천연기념물로 지정되어 보호되고 있다. 본 연구에서는 물거미 서식 습지에서 개체군 밀도를 측정하고, 식생을 비롯한 생태학적 특성을 밝히고, 보전 방안과 관광자원화 방안을 제안하고자 시도되었다. 그 결과 물거미 밀도는 1마리/$m^2$, 총 개체수는 약 8,000마리/ha이었다. 물거미가 사는 곳의 습지는 수위변동이 심하였고, 현존식생은 나도겨풀과 갈대가 우점하였고, 물속에는 통발이 공통적으로 출현하였다. 본 지역은 현재 육화가 진행되고 있고, 서식지가 단절되어 있어 물거미를 보전하기 위해서는 건기에 물을 공급하고, 서식지를 상호 연결하는 생태통로가 필요하다. 또한 물거미 서식지를 활용한 생태관광화를 위한 방안에 대하여 제안하였다.

• ALGAE
• /
• 제33권3호
• /
• pp.269-278
• /
• 2018

Ocean warming can have significant negative impacts on population genetic diversity, local endemism and geographical distribution of a wide range of marine organisms. Thus, the identification of conservation units with high risk of extinction becomes an imperative task to assess, monitor, and manage marine biodiversity for policy-makers. Here, we surveyed population structure and genetic variation of the red seaweed Gracilaria vermiculophylla along the coast of China using genome-based amplified fragment length polymorphism (AFLP) scanning. Regardless of analysis methods used, AFLP consistently revealed a south to north genetic isolation. Populations at the southern coast of China showed unique genetic variation and much greater allelic richness, heterozygosity, and average genetic diversity than the northern. In particular, we identified a geographical barrier that may hinder genetic exchange between the two lineages. Consequently, the characterized genetic lineage at the southern coast of China likely resulted from the interplay of post-glacial persistence of ancestral diversity, geographical isolation and local adaptation. In particular, the southern populations are indispensable components to explore evolutionary genetics and historical biogeography of G. vermiculophylla in the northwestern Pacific, and the unique diversity also has important conservation value in terms of projected climate warming.

• 생태와환경
• /
• 제51권4호
• /
• pp.365-372
• /
• 2018

The Wintering Waterbird Census of Korea was started in 1999 and monitors 200 major migratory sites in South Korea. Waterfowl counts have been undertaken for more than 20 years since; however, a limited number of studies have analyzed the temporal patterns of waterfowl population. In this study, we analyzed population size changes of wintering whooper swan (Cygnus cygnus) at 112 monitoring sites from 2001 to 2018. The average number of whooper swans was $4,296{\pm}42.66$ and there was a trend for an increase in population size across the survey period. We found that the population in the Nakdong River Estuary, one of the major wintering sites over 18 years (26.22% of the national population), had rapidly decreased (-0.77% per year). Conversely, the whooper swan population in the Junam Reservoir and Sihwa Lake increased (+1.64%, +0.54% per year, respectively). Estuaries showed the highest dominance of whooper swans among the five different habitat types, accounting for 32.13% of the population. Reservoir/lakes had 30.60% of the total population and reclaimed lakes(18.24%), river (13.11%), and coast (5.93%) followed. The annual distribution of the whooper swan population in South Korea has been affected by various habitat conditions resulting from human activities and urbanization. To better understand the complex factors that can cause rapid changes in wintering waterfowl populations, it is necessary to integrate the data from the bird census program with environmental conditions to conduct in-depth pattern analyses over longer time periods.