Current status of the threatened amphibians and reptiles of Japan |
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Authors: | H Ota |
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Institution: | (1) Tropical Biosphere Research Center, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan Tel. +81-98-895-8937; Fax +81-98-895-8576 e-mail: ota@sci.u-ryukyu.ac.jp, JP |
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Abstract: | This article compares amphibian and reptile components of the original and revised versions of the Red List of Japan, and
analyzes geographic patterns of, and major threats to, species and subspecies now assigned to the threatened categories. The
numbers of both amphibians and reptiles categorized as threatened in the Red List of Japan have increased greatly through
its revision as a result of recent progress in the taxonomy of these groups in Japan, the introduction of new criteria for
risk assessment, and unexpectedly rapid declines in the status of several taxa. Threatened taxa of amphibians and reptiles
in the revised list tend to be concentrated in the Ryukyu Archipelago, where deforestation seems to be the major ultimate
cause of declines. Reduction in the quality and quantity of inland water environments seems to be the major cause of declines
in several endemic amphibians from the main islands of Japan. The importance of conservation was emphasized in the revised
list by progress in taxonomy, by new insights and data on the estimation of temporal dynamics of population density or habitat
size for threatened taxa, and by the impacts of and need to prevent further deforestation in the Ryukyus and of the ongoing
destruction of inland water habitats on the main islands of Japan.
Received: May 6, 1999 / Accepted: October 26, 1999 |
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Keywords: | Conservation Population decline Red list Risk assessment Taxonomy Threatened categories |
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