Fruit set ratio of flowers subjected to bagging treatment for 60 plant species inhabiting Obihiro and its vicinity

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  • Konno Yasuo
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • Sejima Megumi
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • Yasaka Michiyasu
    Hokkaido Forest Research Institute
  • Nishiwaki Yuki
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • Okayama Megumi
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • Tanabe Kazuko
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine

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Other Title
  • 帯広市近郊に生育する植物60種の袋掛け処理下における結実率
  • オビヒロシ キンコウ ニ セイイク スル ショクブツ 60シュ ノ フクロカケ ショリ カ ニ オケル ケツジツリツ

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To appreciate a local flora in terms of fragility caused by loosing pollinators in increasingly fragmented habitats, fruit set ratio of flowers was surveyed for 60 plant species between those subjected to excluding pollinators by bagging and those without treatment (control). 60 species include 8 annual and biennial, 36 perennial, and 16 woody plants. The ratio for 60 species under bagging treatment showed a bimodal distribution with the highest mode at the two extreme classes of 0-10% and 90-100% while under control half of the plants surveyed had >90% fruit set ratio. Plant groups with a longer life span had a lower fruit set ratio under both the bagging treatment and control. Under bagging treatment all annual and biennial plants had >90% fruit set ratio though woody and perennial plants exhibited bimodal distribution. Under control, the bimodal distribution demonstrated under bagging treatment shifted its shape to uniform for woody plants and to monomodal for perennial plants with the mode at the 90-100% class of fruit set ratio. Half of the herbaceous plants which mainly grow interior of forests significantly decreased the fruit set ratio by bagging compared with that for control while only 11% of the herbaceous plants which occur exterior of forest did. These results indicate a tendency for woody and perennial plants and for forest-interior-plants to suffer from pollinator limitation due to destroy and increasing isolation of their habitats.

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