Abstract Detail



Population Genetics/Genomics

Chiang, Yu-Chung [1], Pan, Ching- Wen  [2], Hsu, Tsai-Wen  [3].

Population genetic differentiation and adaptive evolution between populations of different altitude of Juniperus formosana Hayata.

Juniperus formosana Hayata is distributed at different altitudes in Taiwan. There are huge populations at altitudes over 2500 meters in the Central Mountains and only a small population in the low-altitude regions around Chin-Shui Cliff. The difference in environment causes environmental selection, which may induce local adaption among these discontinuously distributed populations, and thus produces intraspecific differentiation. In this study, sequences of three chloroplast spacers and twenty nuclear loci were used to analyze 74 individuals of different populations from high altitude regions, low altitude regions and the WuYi Mountains (China). The topological demography is shown obvious divergence between high and low altitudes populations. The result of the analysis of population dynamics by Mismatch and Bayesian methods shows that both the high altitude and low altitude populations in Taiwan expanded in the past. The most recent common ancestor (TMRCA) was about 2.02-3.32mya (nrDNA) and 3.58-4.28 mya (cpDNA). Between WuYi Mountain and high-altitude populations has detected the divergence time of 0.14 mya. We concluded that that these populations invaded Taiwan during the glaciation periods, and they then hugely expanded. The high and low-altitude populations have kept the unique genes, when habitat fragmentation. While the low-altitude populations were trapped in the low altitude regions in Taiwan. Due to ecological adaptation, J. formosana Hayata developed into various lineages to adapt to environmental variety.


1 - National Sun Yat-sen University, Department Of Biological Sciences, No. 70, Lienhai Road,, Kaohsiung, Taiwan, 80424, Taiwan
2 - National Sun Yat-sen University, Department Of Biological Sciences, Department Of Biological Sciences, No. 70, Lienhai Road, Kaohsiung, 80424, Taiwan
3 - Taiwan Endemic Species Research Institute, Nantou, 552, Taiwan

Keywords:
genetic differentiation
Juniperus formosana
 adaptive evolution
Adaptation.

Presentation Type: Poster
Number: PPG004
Abstract ID:526
Candidate for Awards:None


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