Adaptive restoration of Nymphoides peltata populations in Lake Kasumigaura from the soil seed bank

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  • 霞ヶ浦における土壌シードバンクからのアサザ個体群再生のための順応的な実践
  • カスミガウラ ニ オケル ドジョウ シードバンク カラ ノ アサザ コタイグン サイセイ ノ タメ ノ ジュンノウテキ ナ ジッセン

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Abstract

Conservation measures have been implemented in Lake Kasumigaura, Japan, to restore the population of an endangered floating-leaf plant, Nymphoides peltata, from the seed bank remaining in lakeshore soil. Adaptive management was undertaken to elucidate the life history of this plant and restore the restricted environmental conditions needed for seedling establishment and subsequent vegetative growth. First, the lakeshore topography was rehabilitated using civil engineering techniques to create the hypothesized condition of "safe sites" for seedling establishment, i.e., bare ground exposed during lower water levels in spring. This led to the successful establishment of 267 seedlings in 2002. However, these seedlings retained their terrestrial form instead of adopting the floating-leaf form. As the next steps, the established seedlings were cultivated under shallow water and then reintroduced into the lake in 2004. Vegetative growth occurred and was followed by flowering, seeding, and emergence of new seedlings. By 2007, a population consisting of at least ten genets had been restored in a 488m^2 area. This study reveals that recovering the original water regime of the lake through spring drawdown and subsequent raising of the water level is essential to restore a self-sustainable population of N. peltata.

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