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Haplotypic differentiation between seasonal populations of Sargassum horneri (Fucales, Phaeophyceae) in Japan
Author(s) -
Watanabe Kohei,
Homma Yuri,
Karakisawa Hideyuki,
Ishikawa Ryoko,
Uwai Shinya
Publication year - 2019
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.12355
Subject(s) - biology , fucales , genetic diversity , reproductive isolation , ecology , seasonality , zoology , algae , population , demography , sociology
SUMMARY Conspecific populations with different life‐cycle seasonality, particularly of their reproductive season, have been reported for many seaweed species. However, the number of genetic analyses of such seasonal populations is limited. Herein, based on the mitochondrial cytochrome oxidase subunit 3 gene ( cox 3) haplotype, we evaluated the genetic diversity of winter (January–March) and spring (April–June) fertile populations of the brown alga Sargassum horneri in Sado Island, Japan. Obviously, dominant cox 3 haplotypes were different between seasons (even at a single site), and the N ST values indicated the presence of a strong genetic differentiation between the two seasonal populations. AMOVA analyses confirmed that most of the genetic diversity was between seasons rather than between regions. Herein, the possibility of allochronic isolation is discussed. Considering the phylogeny of the mitochondrial cox 3 DNA sequence, autumn or winter seasonal populations such as those in this investigation have evolved independently at least twice in the species. The present study shows that a shift in breeding season could be expected to conserve the genetic diversity of S. horneri in a certain region.