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Systematics, distribution, and sexual compatibility of six Scytosiphon species (Scytosiphonaceae, Phaeophyceae) from Japan and the description of four new species.

Authors
  • Hoshino, Masakazu1
  • Tanaka, Atsuko2
  • Kamiya, Mitsunobu3
  • Uwai, Shinya4
  • Hiraoka, Masanori5
  • Kogame, Kazuhiro6
  • 1 Department of Natural History Sciences, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan. , (Japan)
  • 2 Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Nishihara, 903-0213, Japan. , (Japan)
  • 3 Department of Ocean Sciences, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo, 108-8477, Japan. , (Japan)
  • 4 Research Center for Inland Seas, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501, Japan. , (Japan)
  • 5 Usa Marine Biological Institute, Kochi University, 194 Inoshiri, Usa, Tosa, Kochi, 781-1164, Japan. , (Japan)
  • 6 Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan. , (Japan)
Type
Published Article
Journal
Journal of phycology
Publication Date
Apr 01, 2021
Volume
57
Issue
2
Pages
416–434
Identifiers
DOI: 10.1111/jpy.13089
PMID: 33098679
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The brown alga Scytosiphon lomentaria (Scytosiphonaceae, Ectocarpales) has been reported from cold and warm waters worldwide. Although previous molecular phylogenetic studies and crossing experiments have shown that it is a complex of multiple distinct species, the taxonomic position and accurate distribution of each species have remained largely unclear. For the S. lomentaria complex from Japan, our cox1 and rbcL phylogenetic analyses detected six species. In addition to five previously detected species (species Ia-Va), one species (species VI) was newly found in the subtropical area, Okinawa Island. Species VI was recovered as a sister to species Ia-Va in rbcL. Based on the morphological and phylogenetic data, we concluded that species Ia is S. lomentaria, species IIIa is S. promiscuus, and the other four species are newly described: S. shibazakiorum for species IIa, S. tosaensis for species IVa, S. arcanus for species Va, and S. subtropicus for species VI. The cox1-based analysis also showed that S. lomentaria, S. shibazakiorum, and S. promiscuus have worldwide distributions, while the other three species were not found outside of Japan. In Japan, except for S. subtropicus, distributions of these species overlapped. Our crossing experiments showed that gametic incompatibility (pre-zygotic barrier) was less developed between the allopatric species (i.e., S. subtropicus and others) compared with the sympatric species. It may suggest that pre-zygotic barriers have evolved among the sympatric species due to reinforcement. © 2020 Phycological Society of America.

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