Honyurui Kagaku (Mammalian Science)
Online ISSN : 1881-526X
Print ISSN : 0385-437X
ISSN-L : 0385-437X
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Volume 46, Issue 2
Displaying 1-16 of 16 articles from this issue
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Original Article
  • Agricultural damage caused by feral coypus (Myocastor coypus) in Aichi Prefecture, Japan
    Keiko Sone, Kazuhiro Koyasu, Shuji Kobayashi, Shin Tanaka, Sen-ichi Od ...
    2006 Volume 46 Issue 2 Pages 151-159
    Published: 2006
    Released on J-STAGE: February 01, 2007
    DOIhttps://doi.org/10.11238/mammalianscience.46.151
    JOURNAL FREE ACCESS
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    We carried out an interview survey regarding the current status of agricultural damage caused by feral coypus, Myocastor coypus, in 87 municipalities in Aichi Prefecture, central Japan. It seemed that coypus damaged rice plants and 23 kinds of vegetables. Damage to rice plants was found in most of the damaged districts (32 municipalities/94.1%) and occurred intensively during the seedling (Mar.-Jun.) and growing (Jul.-Sep.) seasons. Damage to vegetables occurred in the harvest seasons, i.e., summer or winter. Cucurbits (16 municipalities/47.1%), potatoes (11 municipalities/32.4%), root vegetables (8 districts/23.5%), leaf vegetables (3 municipalities/8.8%), and beans (3 municipalities/8.8%) were damaged in summer, while leaf (17 municipalities/50.0%) and root (10 municipalities/29.4%) vegetables were damaged in winter. According to comments from 18 farmers and to field observations, most of this damage occurred in fields near rivers, especially from dusk to dawn. Exceptional damage, such as the invasion of home gardens and the breaking of fishnets, also occurred. Further studies on the assessment of damage volume and the development of prevention techniques will help research or management activities associated with feral coypus.
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Short Communications
  • Reproductive activity of the small Japanese field mouse (Apodemus argenteus) in the Oze district of northeastern Honshu, Japan
    Takashi Tateishi
    2006 Volume 46 Issue 2 Pages 161-167
    Published: 2006
    Released on J-STAGE: February 01, 2007
    DOIhttps://doi.org/10.11238/mammalianscience.46.161
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    Reproductive activity of the small Japanese field mouse (Apodemus argenteus) was studied in woodlands at 1,000-1,900 m altitude in the Oze district in northeastern Honshu, Japan. The present surveys were carried out from mid July to early August of each year during 1985 to 1999 except for 1986 and 1991. The specimens investigated were 266 individuals in males and 265 individuals in females. Males and females with body weights of 14.1 g or more were regarded as adults. I estimated that 80.2% (166/207 individuals) of adult males and 60.9% (103/169 individuals) of adult females were reproductively activity. Therefore, the period of the present survey was within the breeding season in both sexes. Moreover, the breeding season of A. argenteus in this survey area seemed to be at least May through August judging from the estimated birth time of the juvenile. Some females became pregnant twice or more during each breeding season. Mean embryo size was 3.57 in all pregnant females and no significant difference was recognized for embryo size per pregnant females among body weight classes.
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  • An evaluation of the efficacy of the EggTM trap for capturing feral raccoons in Hokkaido
    Go Abe, Masahide Aoyagi, Yohei Matoba, Mariko Sashika, Toshio Kurumada ...
    2006 Volume 46 Issue 2 Pages 169-175
    Published: 2006
    Released on J-STAGE: February 01, 2007
    DOIhttps://doi.org/10.11238/mammalianscience.46.169
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    The wire cage trap, which is the most popular restraining measure for capturing feral raccoons (Procyon lotor) in Japan, has some problems, including 1) capturing untargeted animals, 2) bait stealing by small animals and mechanical failure, 3) trap-shyness, 4) tendency to break due to the activities of captured animals, and 5) high cost of purchasing, transportation and maintenance. Seven EggTM traps were employed to examine their efficacy in preventing these problems. In this study, 2 feral raccoons (a 5-year-old male and a 6-year-old female) were captured without injury over 200 trap nights. No untargeted animals were captured and only one trap failed due to a crack in inner parts. There was also no bait loss recorded with the bait-setup that involved a trap hanging from an iron pole. The results showed that the EggTM traps, which are cheaper, smaller, lighter, and easier to maintain than live cage traps, could help resolve or reduce some problems of live cage traps in capturing feral raccoons.
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Reports
  • Day roosts of parturient Ikonnikov's whiskered bat, Myotis ikonnikovi Ognev
    Daisuke Fukuda, Takashi Kamijo, Sachiko Yasui
    2006 Volume 46 Issue 2 Pages 177-180
    Published: 2006
    Released on J-STAGE: February 01, 2007
    DOIhttps://doi.org/10.11238/mammalianscience.46.177
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    Little is known about roosting habitat of tree-roosting bats in Japan. We used radiotransmitters to locate and characterize day-roosts of parturient Ikonnikov's whiskered bats, Myotis ikonnikovi. One pregnant female bat was radiotracked in a temperate deciduous forest in Nikko, Tochigi prefecture, Japan during July 2004. We followed the bat for 3 days and found 2 roosts located under the exfoliating bark of snags. A large number of bats emerged for 3 days continuously from one of the snags. We counted up to 31 bats emerging from the roost, which was the largest aggregation ever reported in natural roosts of the species.
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  • Comparison of species names of Japanese mammals between "A Guide to the Mammals of Japan" and "Mammal Species of the World, Third Edition"
    Masaharu Motokawa, Sayaka Shimoinaba, Satoshi Suzuki
    2006 Volume 46 Issue 2 Pages 181-191
    Published: 2006
    Released on J-STAGE: February 01, 2007
    DOIhttps://doi.org/10.11238/mammalianscience.46.181
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    We compared recent taxonomic arrangements of the Japanese mammals between "A Guide to the Mammals of Japan" by Abe in 2005 (GMJ2) and "Mammal Species of the World, Third Edition" by Wilson and Reeder in 2005 (MSW3). GMJ2 and MSW3 recognized 116 and 120 species, respectively, from Japan except for apparent introduced species and marine mammals of Order Cetacea and Order Sirenia. For higher rank, Order Insectivora used in many publications, including GMJ2, is divided into three Orders by MSW3: Order Afrosoricida, Order Erinaceomorpha, and Order Soricomorpha. The Japanese "Insectivora" species (Family Soricidae and Family Talpidae) are included within Order Soricomorpha. We made a comparative list of species between GMJ2 and MSW3 and found considerable differences in taxonomy at the species level. Furthermore, there are several additional important reports for the species taxonomy of some Japanese mammals after the preparation and publication of GMJ2 and MSW3. We provide 37 comments summarizing the differences between GMJ2 and MSW3 and for additional information.
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Series: Methods and techniques for studying carnivores (Carnivora) in Japan
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Reports on the International Conference
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