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Drastic decline in the endemic brown shrike subspecies Lanius cristatus superciliosus in Japan

Published online by Cambridge University Press:  17 November 2020

MUNEHIRO KITAZAWA*
Affiliation:
Graduate School of Agriculture, Hokkaido University, Nishi 9, Kita 9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan.
MASAYUKI SENZAKI
Affiliation:
Faculty of Environmental Earth Science, Hokkaido University, Nishi 5, Kita 10, Kita-ku, Sapporo, Hokkaido 060-0810, Japan.
HIROAKI MATSUMIYA
Affiliation:
Graduate School of Science and Technology, Shinshu University, 8304, Minamiminowa, Nagano399-4598, Japan.
SEIICHI HARA
Affiliation:
Faculty of Agriculture, Shinshu University, 8304, Minamiminowa, Nagano399-4598, Japan.
HARUKA MIZUMURA
Affiliation:
Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo113-8657, Japan.
*
*Author for correspondence; email: goldcrestxmunebirds@gmail.com

Summary

The Brown Shrike Lanius cristatus breeds across a large portion of eastern Asia. One subspecies, L. c. superciliosus, is primarily endemic to Japan and was historically abundant throughout its breeding range. However, both local- and broad-scale studies documented a drastic population decline between the 1970s and 1990s, and the status of the taxon is currently unavailable in Japan. We conducted a nationwide survey to estimate the current population size and breeding range of this subspecies within Japan. We further compared our findings to the historical breeding ranges through a literature review. The total population size was estimated at 149 breeding pairs, and the current breeding range was estimated at 6,800 km2, indicating a 90.9% range contraction over the past century. Our study highlights the urgency of protecting remaining breeding habitats and establishing effective conservation strategies for L. c. superciliosus.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of BirdLife International

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