NDLI: Estimation of the Genetic Composition of a Near-Threatened Tidal Marsh Plant, Carex rugulosa, in Japan

Content Provider	Springer Nature Link
Author	Ohbayashi, Kako Hodoki, Yoshikuni Kunii, Hidenobu
Copyright Year	2012
Abstract	As human alterations such as riverbed excavation and harbor improvements have diminished natural littoral regions and estuarine basins, the numbers of organisms living in tidal marsh have declined. The tidal marsh halophyte Carex rugulosa has been commonly observed along the Japanese coastline over the past centuries; however, this species has recently been designated as near threatened. To determine the genetic structure of C. rugulosa, we examined the genetic composition within and among populations and attempted to clarify habitat salinity. Large populations along the Pacific Ocean exhibit relatively high clonal diversity and repeated seedling recruitment, which maintain the genotypic diversity in those populations. Conversely, lower clonal diversity is observed at the distributional margins, suggesting that marginal populations have low seedling recruitment. In terms of habitat salinity, high genetic diversities were observed between 5 and 15 psu in the Hii River watershed. The extant populations in Japan comprise three genetically distinct clusters whose population divisions correspond to the geological distribution and direction of ocean currents around Japan. Our results suggest that most C. rugulosa populations have relatively high inbreeding coefficients or low clonal diversities due to low seed recruitment or fragmentation and that reduction of genetic connectivity among populations is one causality for this low genetic diversity.
Starting Page	175
Ending Page	184
Page Count	10
File Format	PDF
ISSN	02775212
Journal	Wetlands
Volume Number	32
Issue Number	1
e-ISSN	19436246
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-11
Publisher Institution	Society of Wetland Scientists
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Clonal diversity Management unit Microsatellite markers Near-threatened species Ecology Coastal Sciences Landscape Ecology Environmental Management Freshwater & Marine Ecology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry

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