거문군도 희귀식물 박달목서 개체군 특성과 보존생물학적 연구
Studies on the Characteristics and Conservation Biology of a Rare Tree, Osmanthus Insularis Koidz. Populations of Geomundo Archipelago in Korea
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초록
본 연구는 전남 여수시 소재 거문군도에 분포하는 박달목서의 개체군 분포특성과 개체군 동태, 보존생물학적 연구를 통해 박달목서 개체군의보전방안을 제시하기 위해 수행되었다. 거문군도 내 4개의 도서에 분포하는 박달목서는 고도에 31개체, 동백섬 41개체, 서도 49개체, 동도 1개체로총 122개체가 조사되었으며, 서도와 동백섬에서는 개체 수가 점차 증가할 것으로 추정되었다. 122개체 중 성숙목은 81개체였으며, 41개체는 미성숙목이었다. 성숙목 중 암나무는 39개체, 수나무 42개체로 성비는 1.08로 추정되었다. 유효집단크기는 23.0~30.9으로 성숙목 집단의 크기보다 작은것으로 나타났다. 암․수나무의 공간분포는 암나무가 수나무에 비해 집중분포하는 경향을 보였다. 박달목서의 유전적 다양성은 10개의 isozyme에서12개의 유전자좌가 산출되었고, Nei의 유전적 다양성은 평균 E=0.148로 다소 낮은 수준이었다. 그리고 아집단간 유전적 분화 정도는 Fst=0.078로서매우 낮은 수준이었으며, 유전자 이동(Nm)은 2.94로서 높은 결과를 보였다. 거문군도에 분포하는 박달목서의 분포특성과 개체군 동태 및 보존생물학적 연구결과를 종합하여 박달목서 개체군의 보전방안을 제시하였다.
Abstract
This study was to suggest a conservation plan for the Osmanthus insularis populations througha study on the population characteristics and conservation biology of O. insularis distributed in Geomun archipelago, Yeosu-si, Jeonnam- do. A total of 122 individuals of O. insularis distributed in Godo, Dongbaek, Seodo and Dongdo within Geomundo archipelago were investigated: 31 individuals in Godo, 41 individuals in Dongbaek, 49 individuals in Seodo, and 1 individual in Dongdo. It was estimated that the number of individuals in Seodo and Dongbaek would gradually increase. Among 122 individuals, 39 individuals were female and 42 individuals were male, with a sex ration of 1.08. The effective population size ranged from 23.0 to 30.9, and it was found to be smaller than the size of the mature population. Female trees tended to be more concentrated in the spatial distribution of O. insularis. As for genetic diversity of O. insularis, 12 loci were generated from 10 isozymes, and the genetic diversity of Nei was average E=0.148. The degree of genetic differentiation was very low as Fst=0.078, and the gene transfer (Nm) was high as 2.94. Conservation plan for the O. insularis population distributed in Geomundo archipelago was presented by synthesizing the results on distribution characteristics, population dynamics, and conservation biology research.
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