• Title/Summary/Keyword: population biology

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Genetic Diversity and Population Structure of Pseudobagrus fulvidraco in the Nakdong River (낙동강에 분포하는 동자개 집단의 유전적 다양성과 집단구조)

  • Huh, Man-Kyu;Choi, Joo-Soo;Heo, Youn-Seong;Lee, Bok-Kyu
    • Journal of Life Science
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    • v.17 no.7 s.87
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    • pp.882-888
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    • 2007

  • Enzyme electrophoresis was used to estimate genetic diversity and population genetic structure of Pseudobagrus fulvidraco in Korea. Nine of the 14 loci (64.3%) showed detectable polymorphism. Genetic diversity at the population and species levels were 0.286 and 0.277, respectively. Analysis of fixation indices, calculated for all polymorphic loci in each population, showed a substantial deficit of hetero-zygotes relative to Hardy-Weinberg expectations. This deficit is expected that it is due to a limited effective number of individuals per population. The average $G_{ST}$ for polymorphic loci was 0.064, indicating that most (93.6%) of the genetic diversity occurred within populations. The indirect estimate of gene flow based on mean $G_{ST}$ was 3.67. Given limited gene flow is expected to diverge genetically due to drift and reduced populations. Most populations in our study experience annual, severe demo-graphic bottlenecks due to drought and floods.

  • https://doi.org/10.5352/JLS.2007.17.7.882 인용 PDF KSCI

Morphological and Ecological Aspects on the Population of Cobitis koreensis KIM (Pisces, Cobitidae) in the Begehon Stream, Puan-gun, Cholla-bugdo, Korea (백천에 서식하는 참종개Cobitis koreensis KIM 개체군의 형태와 생태)

  • Kim, Ik-Soo;Wan-Ok Lee
    • The Korean Journal of Ecology
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    • v.6 no.4
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    • pp.10-20
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    • 1983

  • Morphological and ecological comparions are made between specimens of Cobitis koreensis KIM and the geographically restricted population of the Cobitid fish which is found along the Begchon stream, Puangun, Cholla-bugdo province over a 12-month period of 1982 and 1983. The Begchon population is tentatively identified as Cobitis koreensis, but the color patterns and two morphometric proportions differ widely fromthose reported previously for this species. In addition to these character, it is easily distinguished from C. koreensis by the smaller body size, by having the larger egg size and the less egg number in female during the breeding season. As the differentiation of this population is primarily due to geographically isolation, it is supposed that Begchon cobitid population may be an undescribed distinct subspecies of K. koreensis or above the conventional subspecies level.

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Morphometric variation, genetic diversity and allelic polymorphism of an underutilised species Thaumatococcus daniellii population in Southwestern Nigeria

  • Animasaun, David Adedayo;Afeez, Azeez;Adedibu, Peter Adeolu;Akande, Feyisayo Priscilla;Oyedeji, Stephen;Olorunmaiye, Kehinde Stephen
    • Journal of Plant Biotechnology
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    • v.47 no.4
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    • pp.298-308
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    • 2020

  • Genetic diversity among Thaumatococcus daniellii populations in the southwestern region of Nigeria were assessed using morphometric and molecular markers to determine the population structure and existing genetic relationship for its improvement, conservation and sustainable utilisation. Populations from five locations in each of the six states were used for the study. Morphometric data were collected on folia characters and analysed for variability. Genome DNA was isolated from the plant leaf and amplified by polymerase chain reaction with inter-simple sequence repeat markers (ISSR) to determine the allelic polymorphism, marker effectiveness and genetic relationship of the population. The results showed significant variations in petiole length and leaf dimensions of the populations within and across the states. These morphometric traits are the major parameters that delimit the populations and they correlated significantly at P≤0.05. Analysis of the electrophoregram showed that the ISSR markers are effective for the diversity study. A total of 136 loci were amplified with an average of 7.16 loci per marker, 63.2% of the loci were polymorphic. The Principal Coordinate Analysis revealed that seven factors accounted for 81.6% of the variation and the dendrogram separated the populations into two major groups at a genetic distance of 10 (about 90% similarity) with sub-groups and clusters. Most populations within the state had a high degree of similarity, nonetheless, strong genetic relationship exists among populations from different states. The close relationship between populations across the states suggests a common progenitor, which are likely separated by ecological or geographical isolation mechanisms.

  • https://doi.org/10.5010/JPB.2020.47.4.298 인용 PDF KSCI