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Genetic diversity and population structure of two Korean pond frog species, Rana nigromaculata and R. plancyi (Anura, Ranidae), with a survey of temporal genetic variation in R. nigromaculata

Animal Cells and Systems 1999년 3권 3호 p.275 ~ 283
양서영, 김종범, 민미숙, 서재화,
소속 상세정보
양서영 ( Yang Suh-Yung ) - Inha University College of Natural Sciences Department of Biology
김종범 ( Kim Jong-Bum ) - Inha University College of Natural Sciences Department of Biology
민미숙 ( Min Mi-Sook ) - Inha University College of Natural Sciences Department of Biology
서재화 ( Suh Jae-Hwa ) - Inha University College of Natural Sciences Department of Biology

Abstract


Korean R. plancyi occupies a restricted area in western South Korea and shows a relatively low level of genic variability (%P=15.2, Ho=0.052, He= 0.048). In contrast, R. nigromaculata is broadly distributed in South Korea. The observed low level of variability of R. nigromaculata (%P=14.3, Ho= 0.042, He=0.043) is probably due to its recent colonization. Populations of R. nigromaculata exhibited considerable genetic differentiation (FST=0.149) and low level of gene flow (Nm=1.427) among populations, compared to those of R. plancyi (FST=0.096, Nm=2.354), which occupies a restricted area. The observed levels of gene flow among populations of R. nigromaculata (Nm=1.427) over a broad geographic range is relatively higher than other amphibian species. The high level of gene flow is probably the result of the high dispersal abilities of R. nigromaculata. A survey of temporal genic variation of R. nigromaculata showed that there was no significant change on the overall average genetic diversity from 1978 (average He=0.044) to 1997 (average He=0.040). Wright's F?statistics also indicated no significant genetic differentiation from 1978 (FST=0.118) to 1997 (FST=0.108). This suggests that the environmental change appears to have had little influence on the genetic composition of R. nigromaculata in the study areas during the past 20 years. The low level of temporal variation might be due to the result of high dispersal abilities and wide migration range of this species.

키워드

Amphibia; Rana nigromaculata; Rana plancyi; Isozyme; Genetic variation; Genetic population structure; Temporal variation

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