阿蘇地方および中国地方におけるヒゴタイEchinops setifer Iljinの現状(保全情報)

概要

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Echinops setifer is an endangered perennial herb found in semi-natural grassland in the Tokai, Chugoku, and Kyushu regions of Japan. To elucidate the status of E. setifer populations on Aso Mountain and Chugoku Mountain regions, we conducted field surveys and genetic analysis using microsatellite markers for all known populations in these two regions. Field surveys revealed the existence of only several tens of mature individuals in each population and a decrease in the number of mature individuals in most populations. Analysis of genetic diversity showed that the diversity of the remnant population was relatively low on Aso Mountain. In nearly half of all cases, the vegetation in E. setifer habitats has dramatically changed due to a change in, or abandonment of, traditional grassland management systems in recent decades. The change in grassland vegetation threatens the continued existence of E. setifer individuals. Thus, maintenance and monitoring of vegetation in the habitats of this plant are essential for E. setifer conservation programs.
2009-05-30