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Phylogeography of Asparagopsis taxiformis revisited: Combined mt DNA data provide novel insights into population structure in J apan
Author(s) -
Kurihara Akira,
Horiguchi Hanna,
Hanyuda Takeaki,
Kawai Hiroshi
Publication year - 2016
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1111/pre.12126
Subject(s) - biology , population , phylogenetic tree , phylogeography , evolutionary biology , intraspecific competition , genetics , mitochondrial dna , genetic relationship , botany , zoology , genetic diversity , gene , demography , sociology
SUMMARY Six intraspecific lineages ( L ineages 1–6) of Asparagopsis taxiformis have been previously established based on mitochondrial cox 2‐ cox 3 intergenic spacer and a partial cox 1 sequences. ‘ L ineage 2’ ( L 2) was suggested to be a recent introduction to the M editerranean S ea, but its source population has not yet been identified. In order to clarify the nature of northwestern P acific populations, we performed extensive sampling in J apan (60 individuals from 16 locations) and molecular phylogenetic analyses based on mitochondrial sequences. Sixteen additional individuals, collected from eight locations in the I ndo‐ P acific, C aribbean, and M editerranean regions, were also analyzed. Combined sequence analyses revealed that the J apanese populations only consisted of L 2. Out of 19 combined haplotypes identified within L 2, two are shared between J apan and the M editerranean S ea and the H awaiian I slands, and 12 were identified as endemic to J apan. Genetic analyses of population differentiation suggested that J apanese populations are genetically isolated from the M editerranean and the H awaiian populations. A genetic disjunction appears to separate two subpopulations within J apan: one between T oi and K agoshima and the other between O jikajima I sland and K agoshima in the K yushu area.