• The Korean Journal of Ecology
• /
• 제26권2호
• /
• pp.82-86
• /
• 2003

We investigated the variation in adaptation to growth for four ecotypically-differentiated population of Taraxacum officinale found naturally in temporal environmental heterogeneity. Seeds collected from the four seasons were germinated in incubators and were grown for four months in greenhouse to test genetic variation among biotypes. Biotypes, segregated by seeds collected seasonally, were the part of natural population in Mokpo, South Korea. Each biotype was different in total dry weight of seeds, biomass, and leaf area, confirming previous finding. Differences between biotypes grown under a common environment indicated a genetic basis to their distinct demographic rates. Therefore, biotypes with similar annual rates of growth and contrasting seasonal rates should persist in the population. This differential response suggests that temporal variation in environment may be responsible, in part, for the maintenance of genetic variation within populations.

• 수완나부미
• /
• 제8권2호
• /
• pp.51-77
• /
• 2016

This paper argues and shows how ethnic dimension is still very important in understanding political contestations in Malaysia. To do this, the paper reviews the political as well as population demography to back its assertion. And it is not necessarily improper to continue to use this ethnic lens, although the continued use of this approach has come under heavy criticism both within and from outside Malaysia. Raging debates in Malaysia and by Malaysians are still very much shaped by ethnicity and increasing regional differences. This is further compounded by other factors such as religion, language, and education. In fact, these tools have been more intensely used of late compared to any period before in history as they easily politicize and attract followers.

• 대한지리학회지
• /
• 제47권1호
• /
• pp.98-120
• /
• 2012

본 연구의 주된 목적은 다지역 코호트-요인법을 적용하여 우리나라의 시도별 장래 인구 추계를 실행하는 것이다. 마르코프 연쇄 모델과 Rogers의 다지역 인구 추계 모델에 대한 검토를 바탕으로 실행 가능한 다지역 코호트-요인법의 프레임워크를 설정하였다. 이 프레임워크를 우리나라 데이터에 적용하여 2005~2030년에 대한 5년 단위의 시도별 인구 추계를 실행하였으며, 그 결과에 대한 타당성을 검토하였다. 중요한 연구 결과는 다음과 같다. 첫째, 본 연구의 추계치를 기존 통계청의 추계치 및 경험 데이터와 비교해 본 결과 제안된 추계 기법의 방법론적 타당성이 매우 높은 것으로 드러났다. 둘째, 본 연구의 방법론은 미래의 지역간 인구이동 매트릭스를 산출한다는 측면에서 추계 결과의 유용성이 매우 높은 것으로 판단되었다. 미래의 지역간 인구이동에 대한 정보는 지역별 인구변동을 이해하고 실질적인 정책 대안을 제시하는데 핵심적인 역할을 할 수 있다. 본 연구는 국가 전체의 인구변동 보다는 인구 이동을 통해 상호 연결되어 있는 하위 지역 인구들의 진화 과정을 더욱 강조하는 다지역 관점의 중요성을 예증하고 있다.

• Proceedings of the National Institute of Ecology of the Republic of Korea
• /
• 제3권3호
• /
• pp.154-164
• /
• 2022

Understanding temporal variations in wildlife populations is a prerequisite for conservation planning of wide-ranging species such as tigers (Panthera tigris). We determined the temporal variation in abundance, population growth, and sex ratios at different age and sex stages for a tiger population in Ranthambhore Tiger Reserve, India from November 2007 to February 2011 using motion-sensing cameras. We identified 19 male and 21 female tigers from stripe patterns during 16,110 trap nights within an area covering 233 km². The annual abundance of the population varied from 34.9 (mean)±3.8 (SE) to 23.9±1.5, with a declining trend in the mean annual change of abundance (-12%). The density of adult females remained stable across the study duration, but the densities of adult males and non-breeding tigers fluctuated. The sex ratio was female-biased (0.58 males/female) for breeding tigers and male-biased (1.74 males/female) for non-breeding tigers. Our results reinforce the importance of long-term studies for monitoring the naturally occurring processes in populations to develop population indicators and identify reliable baseline information for conservation and management planning of populations.

• 한국응급구조학회지
• /
• 제28권1호
• /
• pp.63-76
• /
• 2024

Purpose: To analyze trends related to demography and EMS and to provide supporting data for the appropriate deployment of EMS providers. Methods: In this cross-sectional study, data on patients transported by 119 EMS, demographics, and EMS factors were collected using the Korean Statistical Information Service (KOSIS) and the National Fire Agency annual report from 2017 to 2021. Results: During the study period, the total number of patients and those with severe disorders transported via 119 EMS showed an increasing trend. The total fertility rate and population during the same period tended to decrease, and the population density and number of households increased; however, there was a disparity between regions. The main demographic factors affecting the number of patients transported were population density and total fertility rate, while the main EMS factors were the number of ambulances and provision of emergency medical information services(hospital guidance, pharmacy information, and first aid guidance). Conclusion: From the perspective of EMS providers' force deployment, it is necessary to consider population density, population, number of households, total fertility rate, and number of emergency medical institutions and to strengthen the role of diverting the use of 119 EMS by minor patients by providing emergency medical information.

• 한국인구학
• /
• 제28권2호
• /
• pp.219-243
• /
• 2005

이 글은 1977-2004년의 기간 동안 한국인구학회의 공식학술지에 수록된 총 367편 게재물의 특성을 분석하여 그 동안 한국인구학의 발전과 연구경향의 변화를 살펴보고 있다. 초창기의 학회지에는 연구논문 이외에도 심포지엄 발표논문, 권두언, 특별기고, 동정 등 다양한 유형의 글이 실렸지만 점차 연구논문이 주류를 이루는 방향으로 변화되었다. 그리고 1985년부터는 연 2회로 발간횟수가 증가함에 따라 게재물의 수가 급격히 증가하는 추세를 보인다. 게재된 논문들의 주제를 시기별로 나누어 살펴보면, 초기에는 인구정책, 출산 사망, 인구이동 등의 전통적 연구 주제들이 높은 비중을 차지하였으나 점차 인구규모와 특징, 노동력, 혼인, 가족, 노인, 고령화, 지역연구 등 다양하고 복합적인 주제의 연구논문들이 많이 게재되고 있다. 또한 게재논문의 저자들을 분석한 결과, 초창기에는 연구기관과 통계 관련 국가기관에 속한 연구자들이 상대적으로 많았으나, 1980년대 중반 이후부터는 대학 소속의 연구자들이 급격하게 증가하는 추세를 보인다. 그리고 활동적인 몇몇 연구자들의 기여도가 매우 높은 것으로 드러났다. 분석에 사용된 자료는 각종 사회조사자료 인구센서스와 문헌자료가 과반수를 점유하는 것으로 나타났다. 아울러 초기의 분석방법은 주로 정책분석, 빈도와 교차표분석, 평균차분석이 주류를 이루었으나, 1980년대 중반 이후부터는 회귀분석이, 그리고 1990년대 이후에는 로지스틱분석, 생존분석 등 정교한 기법들의 비중이 급격하게 증가하는 추세를 보인다.

• Journal of Ecology and Environment
• /
• 제48권1호
• /
• pp.49-59
• /
• 2024

Background: The present study aims to identify the pattern and size of Juniperus species (Juniperus phoenicea and J. procera) in the natural forests in terms of tree dimension, size structure and density, discussing the existing both species in Sarrawat Mountains for suggesting the preservation, conservation, and sustainable development. For achieving this, the height and mean crown diameter of each individual was measured based on 2-4 diameter measurements per ind. (506 ind. for J. phoenicea and 322 ind. for J. procera). Results: The size index of both species was classified into 7 classes: the first (< 100 cm) and the second (100-200 cm) classes were chosen to represent the juvenile stage. The total mean of the J. phoenicea population increased with the increase of altitude, while the whole population decreased after altitude of 2,000 m. The total mean of the J. procera population increased with the increase of altitude till altitude of 2,000-2,100 m. Conclusions: The present study indicated that both of species grow at low altitudes, they only grow at altitude above 1,700 m above sea level. The present study indicated that the study area has the two Juniperus spp. (J. phoenicea and J. procera) associated together all over the area. The results were discussed and compared with other related studies.

• 한국인구학
• /
• 제9권2호
• /
• pp.30-41
• /
• 1986

It is worthwhile to compare the major social indicators between Korea the and Taiwan particularly focusing on population because two countries share close similarities in many aspects and gave access to the advanced level among the developing countries in recent years. Similarities or dissimilarities presented in this paper will be helpful to the researchers and the policy makers of the two countries by giving them insight on the situation. The similarities and dissimilarities between the two countries in the field of demography and social indicators are summarized as follows : 1. Similarity indicators can be found in fertility. One of them is Net Reproduction Rate and it was less than one in both countries in 1985. The past trend of fertility, in fact level and pattern of it, of the two countries from 1960 to 1985 has been very similar. 2. Level and pattern of mortality is quite different between two countries. Mortality level of Taiwan is lower than that of Korea. 3. The close similarity between two countries was shown in population structure and aging index. 4. On future population projection, the population structure and the level and pattern of fertility of the two countries are very similar. During fourty years, the period from the current population growth rate which is a little more than 1% to the zero growth rate, the annual population growth rate of the two countries is approximately 0.6% and that is similar to those of the current industrialized countries. According to the medium variant of the projection, Korean population will reach Zero Growth Rate between 2020 and 2025 whereas Taiwan between 2025 and 2020 5. Current level of contraceptive prevalence of both countries is very similar showing above 70% of the eligible women in 1985 and one of the valuable factors of achieving this high rate within short period must be the national program of the family planning. A close cooperation in the field of population policy formulation and its implementation is indispensable because Korea and Taiwan have similarity in many population indicators.

• Animal Systematics, Evolution and Diversity
• /
• 제28권4호
• /
• pp.279-290
• /
• 2012

Plecoglossus altivelis (ayu) is an amphidromous fish widely distributed in Northeastern Asia from the East China Sea to the northern Japanese coastal waters, encompassing the Korean Peninsula within its range. The shore lines of northeastern region in Asia have severely fluctuated following glaciations in the Quaternary. In the present study, we investigate the population genetic structure and historical demographic change of P. altivelis at a population level in East Asia. Analysis of molecular variance (AMOVA) based on 244 mitochondrial control region DNA sequences clearly showed that as the sampling scope extended to a larger geographic area, genetic differentiation began to become significant, particularly among Northeastern populations. A series of hierarchical AMOVA could detect the genetic relationship of three closely located islands between Korea and Japan that might have been tightly connected by the regional Tsushima current. Neutrality and mismatch distribution analyses revealed a strong signature of a recent population expansion of P. altivelis in East Asia, estimated at 126 to 391 thousand years ago during the late Pleistocene. Therefore it suggests that the present population of P. altivelis traces back to its approximate demographic change long before the last glacial maximum. This contrasts our a priori expectation that the most recent glacial event might have the most crucial effect on the present day demography of marine organisms through bottleneck and subsequent increase of effective population size in this region.

• Animal Bioscience
• /
• 제37권4호
• /
• pp.591-599
• /
• 2024

Objective: Sumba Ongole (SO) cattle are valuable breed due to their important role in the development of Indonesian cattle. Despite rapid advances in molecular technology, no genomic studies on SO cattle have been conducted to date. The aim of this study is to provide genomic profile related to the population diversity, admixture, and demographic trends of SO cattle. Methods: Genomic information was gathered from 79 SO cattle using the Illumina Bovine SNP50 v3 Beadchip, and for comparative purposes, additional genotypes from 209 cattle populations worldwide were included. The expected and observed heterozygosity, inbreeding coefficient, pairwise fixation indices between-population, and Nei's genetic distance were examined. Multidimensional scaling, admixture, and treemix analyses were used to investigate the population structure. Based on linkage disequilibrium and effective population size calculations, the demographic trend was observed. Results: The findings indicated that the genetic diversity of SO cattle was similar to that of other indicine breeds. SO cattle were genetically related to indicines but not to taurines or Bali cattle. The study further confirmed the close relationship between SO, Ongole, and Nellore cattle. Additionally, a small portion of the Ongole mixture were identified dominant in the SO population at the moment. The study also discovered that SO and Bali cattle (Bos javanicus) could have been ancestors in the development of Ongole Grade cattle, which corresponds to the documented history of Ongolization. Our finding indicate that SO cattle have maintained stability and possess unique traits separate from their ancestors. Conclusion: In conclusion, the genetic diversity of the SO cattle has been conserved as a result of the growing significance of the present demographic trend. Consistent endeavors are necessary to uphold the fitness of the breed.