ニホンライチョウにおける Leucocytozoon lovati 感染の地域性および季節性 Geographical Distribution and Seasonality of the Prevalence of Leucocytozoon lovati in Japanese Rock Ptarmigans (Lagopus mutus japonicus) found in the Alpine Regions of Japan

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Abstract

我が国の高山地帯に生息する特別天然記念物ニホンライチョウ(Lagopus mutus japonicus)におけるロイコテトゾーン(Leucocytozoon lovati)感染の地域性および季節性について調査した.2002年から2005年の3年間にわたり,南北アルプスの頚城山脈,飛騨山脈および赤石山脈において73個体(雄:42,雌:19,性別不明:12)から採取した血液を供試した.南北アルプス個体群におけるロイコチトゾーン感染率は78.1%であり,広範囲に感染個体が分布していることが確認された.感染率に性差は認めなかった.本血液原虫の血中出現率は,春から夏にかけて上昇し,夏から秋にかけて低下することが観察された.ほとんどの地域個体群にロイコテトゾーン感染が確認されたが,常念岳および前常念岳の個体群には感染を認めなかった.ニホンライチョウの生息域内保全の観点から,本種の個体群動態と本血液原虫の媒介昆虫に村する継続的調査が求められる.

In this study, we investigated the geographical distribution and seasonality of <i>Leucocytozoon lovati</i> infection in the Japanese rock ptarmigan (<i>Lagopus mutus japonicus</i>); this bird is one of the special natural monuments of Japan that inhabits the Japanese alpine regions. We examined blood samples from birds captured in the Kubiki, Hida, and Akaishi mountain ranges for three years from 2002 to 2005. Seventy-three blood samples from 42 males, 19 females, and 12 birds of unknown sex were used for this study. The rate of infection with <i>L. lovati </i>was 78.1% in the 73 birds examined. We demonstrated that the <i>L. lovati</i> infection was distributed across wide ranges of ptarmigan populations from the northern to the southern alpine zones. There was no sex bias in the prevalence ratio. The prevalence of <i>L. lovati</i> and the level of parasitization of the blood cells tended to increase from spring through summer; in contrast, a decrease was observed from summer through autumn. Although <i>L. lovati</i> infection was observed in a number of local populations inhabiting three mountainous regions, no infected birds were found in Mt. Johnen-dake and Mt. Maejohnen-dake. It is necessary to continue surveying the relationship between the population dynamics of the ptarmigan and the density of the arthropod vector from the perspective of <i>in situ</i> conservation of this endangered species.<br>

Journal

  • Journal of Veterinary Medical Science

    Journal of Veterinary Medical Science 69(2), 171-176, 2007-02-25

    Japanese Society of Veterinary Science

References:  18

Cited by:  1

Codes

  • NII Article ID (NAID)
    110006201235
  • NII NACSIS-CAT ID (NCID)
    AA10796138
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    09167250
  • NDL Article ID
    8718413
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-350
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE  JASI 
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