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Revealing the distinct habitat ranges and hybrid zone of genetic sub-populations within Pseudo-nitzschia pungens (Bacillariophyceae) in the West Pacific area

Title
Revealing the distinct habitat ranges and hybrid zone of genetic sub-populations within Pseudo-nitzschia pungens (Bacillariophyceae) in the West Pacific area
Author
한명수
Keywords
Diatom; Ecotype; Genotype; Habitat range; Hybrid zone; qPCR; Speciation; Species biogeography; Sub-population; West Pacific
Issue Date
2018-01
Publisher
ELSEVIER SCIENCE BV
Citation
HARMFUL ALGAE, v. 73, page. 72-83
Abstract
Genetic sub-populations (clades) of cosmopolitan marine diatom Pseudo-nitzschia pungens might have distinct habitats, and their hybrid zone is suspected in higher latitude area of the West Pacific area, however, it is still unrevealed because of technical difficulties and lack of evidences in natural environments. The aim of this study is to investigate the habitat characteristics of each Glade of P. pungens on geographical distribution with the habitat temperature ranges of each Glade and to reveal their hybrid zone in the West Pacific area. We employed the 137 number of nucleotide sequences of P. pungens and its sampling data (spatial and temporal scale) originated from the West Pacific area, and used field application of qPCR assay for intra-specific level of P. pungens. Only two genotypes, Glade I and III, were identified in the West Pacific area. Clade I was distributed from 39 to 32.3 degrees N, and Glade Ill were from 1.4 to 34.4 degrees N. The estimated habitat temperature for the Glade I and Glade III ranges were 8.1-26.9 degrees C and 24.2-31.2 degrees C, respectively. The latitudinal distributions and temperature ranges of each clade were significantly different. The qPCR assay employed, and results suggested that the hybrid zone for Glade I and III has been observed in the southern Korean coasts, and Glade Ill might be introduced from the Southern Pacific area. The cell abundances of clade Ill were strongly related with the higher seawater temperature and warm current force. This study has defined distinct habitat characteristics of genetically different sub populations of P. pungens, and revealed its hybrid zone in natural environment for the first time. We also provided strong evidences about dispersion of the population of Glade III to higher latitude in the West Pacific area. (C) 2018 Published by Elsevier B.V.
URI
https://www.sciencedirect.com/science/article/pii/S1568988318300131?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/117130
ISSN
1568-9883; 1878-1470
DOI
10.1016/j.hal.2018.01.007
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > LIFE SCIENCE(생명과학과) > Articles
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