Status of avian mortality by bird nets to keeping birds from feeding cultivated lotus and effects to living birds by nets

DOI

Bibliographic Information

Other Title
  • ハス田に敷設された防鳥ネットに羅網した野鳥の被害状況と防鳥ネット敷設が鳥類の生息に与える影響

Description

Mortality of birds by entanglement in protective nets for agricultural lotus fields has been reported for such species as Green-winged Teals (Anas crecca), Eurasian Wigeons (A. penelope) and Common Coots (Fulica atra) in Ibaraki Prefecture, Japan. Monthly surveys were conducted on five days in lotus plantations at Lake Kasumigaura in the winter of 2010-2011. Fifteen species of birds were recorded entangled in nets, and a total of 185 individuals were observed to have died after entanglement. The rate of entanglement recorded during the survey was 7.5 +- 1.8 birds (mean +- SD) per 1 ha each day. The mode of entanglement in duck species (Anas sp.) was to be caught by the wings, while Common Coots were mainly caught by the legs and/or toes. The major agricultural periods during which bird were entangled were pre-harvest for Green-winged Teals, and post-harvest for Common Coots. Of 145 carcasses found entangled in the nets, 98 were not observed during the next surveillance day, so this suggests that the bird carcasses were likely to remain caught in the net, and therefore observable, for less than one month. Abundance of Ardeidae and shorebirds were negatively affected by the presence of nets, but Passeriformes did not show any reduction.

Journal

  • Bird Research

    Bird Research 8 (0), A11-A18, 2012

    Japan Bird Research Association

Details 詳細情報について

  • CRID
    1390282680210511872
  • NII Article ID
    130002074938
  • DOI
    10.11211/birdresearch.8.a11
  • ISSN
    18801595
    18801587
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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