里山のスギ林内に生じたギャップで生活するノシメトンボの採餌飛翔  [in Japanese] Foraging flights of Sympetrum infuscatum (Selys) adults inhabiting cedar forest gaps of satoyama (Odonata: Libellulidae)  [in Japanese]

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Author(s)

    • 加藤 賢太 KATO Kenta
    • 筑波大学大学院生命環境科学研究科 Graduate School of Life and Environmental Sciences, University of Tsukuba
    • 渡辺 守 WATANABE Mamoru
    • 筑波大学大学院生命環境科学研究科 Graduate School of Life and Environmental Sciences, University of Tsukuba

Abstract

冷温帯の里山に生息するノシメトンボSympetrum infuscatum(Selys)は,水田で羽化した後,周囲のスギ林のギャップへ移動し,生涯を過ごしている.水田へは,産卵のために短時間飛来するに過ぎない.ギャップでは,繁殖行動を示さず,休息と採餌行動を行なっている.採餌は待ち伏せ型で,ハエやハチなどの小昆虫を餌としている.繁殖期に入ったノシメトンボの採餌行動を,8月下旬から9月初めにかけて観察した.ノシメトンボは,地上から約2mの高さで静止し,正午にピークをもつ一山型の採餌行動を示した.ピーク時の採餌飛翔は,雌で約36回/時間,雄は約24回/時間であった.採餌飛翔の成功率は雌で34%,雄で33%と,雌雄で有意な差はなかった.その結果,1日当たりの採餌成功回数は,雌で102回,雄で64回となった.林内ギャップにおける餌となる小昆虫の平均乾燥重量は0.17mg/個体であったので,ノシメトンボの1日当たりの摂食量は雌で17mg,雄で10mgとなり,これらの値は室内実験の結果と一致した.

After emergence, adults of the dragonfly Sympetrum infuscatum (Selys) moves from rice paddy fields to cedar forests of satoyama in Japan. They stay in the forest gaps throughout their lives, with intermittent visits to rice paddy fields to oviposit there. The forest gaps are used not for mating but for foraging, resting and roosting. They adopt sit-and-wait tactics for foraging to flying small insects such as Diptera and Hymenoptera. The foraging flights of sexually mature adults were observed from late August to early September. The height of perching site was about 2 m in the forest gaps. Each observation was continued until the adult dragonfly left the gap. The foraging flight occurred with a diurnal rhythm, peaking around noon. Females showed 36 foraging flights on average per hour, while males 24 per hour. The number of daily foraging flights was significantly higher in females than in males. About 34% and 33% of flights in females and males, respectively, were successful to capture the target prey. The daily number of captured prey insects was 102 per female and 64 per male. Since the average dry weight of a prey insect flying in forest gaps was 0.17 mg, the daily food intake of a female and a male was calculated 17 mg and 11 mg, respectively, both of which were similar to the amount of food intake estimated in laboratory-reared adults.

Journal

  • Japanese Journal of Entomology (New Series)

    Japanese Journal of Entomology (New Series) 14(3), 177-186, 2011

    Entomological Society of Japan

Codes

  • NII Article ID (NAID)
    110009860025
  • NII NACSIS-CAT ID (NCID)
    AA11248127
  • Text Lang
    JPN
  • ISSN
    1343-8794
  • NDL Article ID
    11154262
  • NDL Source Classification
    ZR4(科学技術--生物学--動物)
  • NDL Call No.
    Z74-B297
  • Data Source
    NDL  NII-ELS  J-STAGE 
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