HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >

Two Kinorhynch Species (Cyclorhagida, Echinoderidae,Echinoderes) Show Different Distribution Patterns Across Tsugaru Strait, Northern Japan

Files in This Item:
ZS31-7 421-429.pdf1.77 MBPDFView/Open
Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/62756

Title: Two Kinorhynch Species (Cyclorhagida, Echinoderidae,Echinoderes) Show Different Distribution Patterns Across Tsugaru Strait, Northern Japan
Authors: Yamasaki, Hiroshi Browse this author
Hiruta, Shimpei F. Browse this author
Kajihara, Hiroshi Browse this author →KAKEN DB
Dick, Matthew H. Browse this author →KAKEN DB
Keywords: dispersal barrier
Kinorhyncha
phylogeography
intertidal organism
COI
population history
Issue Date: 1-Jul-2014
Publisher: Zoological Society of Japan
Journal Title: Zoological Science
Volume: 31
Issue: 7
Start Page: 421
End Page: 429
Publisher DOI: 10.2108/zs140011
Abstract: We investigated the geographic population structures of two intertidal kinorhynch species, Echinoderes sensibilis and Echinoderes sp. A, in the vicinity of Tsugaru Strait between Honshu and Hokkaido Islands, Japan, to examine whether the distribution or connectivity of populations of either species has been constrained by the strait. For each species, we examined the geographic distribution of COI haplotypes, constructed a median-joining haplotype network, and calculated statistics of genetic variation and connectivity. Tsugaru Strait is the northern range limit for E. sensibilis, which comprises a large, evolutionarily stable metapopulation that appears to have undergone a reduction in size followed by expansion; connectivity is low among most local populations, including across Tsugaru Strait. A divergent haplotype lineage showing no variation occurred only at Horozuki, suggesting recent immigration there from outside the study area. Echinoderes sp. A underwent a severe population bottleneck followed by rapid expansion. It occurred at all sampling sites on both sides of the strait, with high connectivity between populations across the strait. There is a zone of secondary contact between moderately divergent, presumably previously allopatric lineages in eastern Hokkaido. Present-day conditions in the strait have existed only for the past 8000 years, and differences in these species’ distributions and apparent connectivity across the strait may relate to conditions existing in the strait when the species underwent population expansions or shifts in range; these historical events were not necessarily concurrent between the species, and occurred more than 8000 years ago. We discuss dispersal mechanisms for kinorhynchs, which could include suspension transport or rafting.
Type: article
URI: http://hdl.handle.net/2115/62756
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Matthew Hill Dick

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 

 - Hokkaido University