Photoperiod Conditions Influence Fecal Estradiol Levels in Females of Migratory Reed Bunting Emberiza schoeniclus and Non-migratory Meadow Bunting Emberiza cioides.

DOI
  • Itoh Masanori T.
    Department of Chemistry, St. Marianna University School of Medicine
  • Nakamura Tsukasa
    Department of Biology, Faculty of Education and Human Sciences, Yamanashi University

Bibliographic Information

Other Title
  • 渡り性オオジュリンと非渡り性ホオジロの排泄物中エストラジオール含有量に対する光周期の影響

Abstract

Fecal estradiol levels in females of the migratory Reed Bunting Emberiza schoeniclus and non-migratory Meadow Bunting Emberiza cioides were measured by radioimmunoassay after extraction with ether. When the photoperiod conditions were changed stepwise from 10hr light/14hr darkness (LD 10:14) to LD 15:9, the fecal estradiol levels in the migratory Reed Bunting increased significantly at LD 12:12 and subsequently decreased at LD 14:10. A similar pattern of change was observed in the non-migratory Meadow Bunting. Fecal estradiol levels appear to reflect the levels circulating in plasma, indicating that estradiol levels circulating in plasma increase at LD 12:12 and subsequently decrease at LD 14:10 not only in the migratory Reed Bunting but also in the non-migratory Meadow Bunting.

Journal

Keywords

Details 詳細情報について

  • CRID
    1390282680015037568
  • NII Article ID
    130003572916
  • DOI
    10.3312/jyio1952.34.1
  • ISSN
    18833659
    00440183
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top