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Papers by Mitsuhiko Asakawa
Journal of Japan Institute of Light Metals, 2008
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, Jul 25, 2019
Members of the genus Glaphyrostomum Braun, 1901 (Trematoda: Brachylaimidae) are parasites of bird... more Members of the genus Glaphyrostomum Braun, 1901 (Trematoda: Brachylaimidae) are parasites of birds. However, an exception occurs in Glaphyrostomum soricis Asakawa, Kamiya and Ohbayashi, 1988, which was described from the longclawed shrew, Sorex unguiculatus Dobson, 1890, in Hokkaido, Japan. A recent DNA barcode-based trematode survey of land snails clearly showed that Ainohelix editha (A. Adams, 1868), a bradybaenid snail indigenous to Hokkaido, serves as the first and second intermediate hosts for a species of the genus Pseudoleucochloridium Pojmańska, 1959 (Panopistidae). Its adult stage was furthermore confirmed from S. unguiculatus. A comparison of adult morphology between Pseudoleucochloridium sp. and G. soricis revealed that both should be considered the same species. However, Pseudoleucochloridium soricis comb. nov. cannot be applied because P. soricis (Sołtys, 1952) already exists as the type species of the genus. We, therefore, propose Pseudoleucochloridium ainohelicis nom. nov. as a replacement name for G. soricis.
Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu, 2000
酪農学園大学紀要. 自然科学編, Apr 1, 2005
Japanese Journal of Ornithology, Oct 24, 2022
Japanese journal of zoo and wildlife medicine, 2015
Chihiro HASHIMOTO 1) ，Tatsuya YAMAMOTO 2) ，Eriko SAITO 2) ，Tomoo YOSHINO 1, 3) ， Yukari SOTOHIRA ... more Chihiro HASHIMOTO 1) ，Tatsuya YAMAMOTO 2) ，Eriko SAITO 2) ，Tomoo YOSHINO 1, 3) ， Yukari SOTOHIRA 4) ，Shigehisa KAWAKAMI 2) ，Mitsuhiko ASAKAWA 1) ＊
酪農学園大学紀要. 自然科学編, Feb 1, 1989
Bulletin of the Biogeographical Society of Japan, 2013
Veterinary Record, May 1, 2006
THE common dormouse (Muscardinus avellanarius) is a rare woodland mammal that appears to have dec... more THE common dormouse (Muscardinus avellanarius) is a rare woodland mammal that appears to have declined substantially in Britain during the past century (Bright and Morris 2002). A conservation initiative in England is reintroducing dormice to suitable habitats where they are absent (Bright and Morris 2002) and supporting the species at sites where it is still found (Bright and Morris 1996). The diseases and parasites of common dormice have rarely been described. Ocular disease associated with Rhabditis orbitalis nematodes has been detected in one common dormouse, possibly associated with management practices in woodland (Sainsbury and others 1996). Another nematode, Richtularia cristata (Skryabin and others 1967), has also been recorded, and cestodes and trematodes have been described, although not in association with disease (Matskasi and others 1996). When wild animals are translocated to return them to the free-living state, it is important to carry out a health risk assessment (Leighton 2002) to ensure that changes in hostparasite encounters brought about by the move do not result in harm through infectious disease outbreaks. It is thus essential to know the status of the species in terms of infectious agents harboured by both captive and wild animals, as well as having information on the parasites recorded in the species in the past. Heligmosomoides polygyrus, an intestinal trichostrongylid nematode, is a common parasite of wild rodents throughout the Holarctic region, including many species belonging to the subfamilies Murinae and Microtinae and two species from the Cricetinae family (Durette-Desset and others 1972, Quinnell and others 1991, Asakawa 1995). This short communication, describes the first observation of H polygyrus infestation in the common dormouse. A female common dormouse (dormouse 1) arrived from another captive collection on May 3, 2001, in a consignment of over 35 common dormice, and was housed at Paignton Zoo, either in a 1 m3 wire mesh cage or a glass-sided tank approximately 0·75 x 0·25 x 0·5 m, with woodchip bedding, an array of branches for climbing and a wooden nestbox with hay for bedding. On the same day, a faecal sample was collected from another female common dormouse (dormouse 2) already present at Paignton Zoo and housed as above, and examined for pathogenic bacteria by culture on horse blood agar (QCM Laboratories), XLD agar (QCM Laboratories) following selenite broth enrichment, and CCDA medium (QCM Laboratories). A faecal smear was stained with modified Ziehl-Neelsen stain for the detection of cryptosporidia, microsporidia and mycobacteria. The faecal sample was also examined for parasites using direct microscopy. No significant bacteria were detected but numerous ova and adult nematodes were observed. Eight of 32 faecal samples collected from individual common dormice or groups of dormice on the same day at Paignton Zoo were positive for strongyle nematode ova. Eight days later, 0·28 mg praziquantel (Droncit; Bayer) and 5 μg ivermectin (Ivomec injection for cattle; Merial) diluted 1:20 in propylene glycol were adminVeterinary Record (2006) 158, 667-668
Journal of Veterinary Medical Science, 2021
Oarfish (Regalecus russelii Cuvier) are mesopelagic fish with little known about their life histo... more Oarfish (Regalecus russelii Cuvier) are mesopelagic fish with little known about their life history. Oarfish live in deep water, making it difficult for researchers to collect specimens; thus, records of their parasitic helminths are limited. Two plerocercoids were found for the first time in an oarfish stranded on the coast of Akita Prefecture, Japan. These plerocercoids were identified as Clistobothrium sp. RR-1 using morphological and molecular analyses. It was revealed that oarfish represent one of the intermediate hosts of the genus Clistobothrium, and large sharks are the definitive hosts for these parasites.
Nihon Senchū Gakkaishi, Sep 20, 2019
A red-crowned crane, Grus japonensis, chick died on August , , in Kushiro, Hokkaido, Japan. In th... more A red-crowned crane, Grus japonensis, chick died on August , , in Kushiro, Hokkaido, Japan. In the postmortem examination, individual nematodes were found in the nasal cavity and anterior thoracic air sacs. The chick died from severe inf lammation of the air sacs, granulomatous pneumonia, and esophageal strangulation, caused by a heavy nematode infection. The nematodes were identified as Cyathostoma (Hovorkonema) sp., based on their measurements and morphological characteristics. This is the first host record of these nematodes from G. japonensis and the first geographical record from Japan. Considering the life cycle, the chick was infected with the nematodes by ingestion of earthworms, because the chick had been given many earthworms as food from the parents. Nematol. Res. (),- .
Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu, 2007
Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu, 2004
Journal of Japan Institute of Light Metals, 2008
Species diversity : an international journal for taxonomy, systematics, speciation, biogeography, and life history research of animals, Jul 25, 2019
Members of the genus Glaphyrostomum Braun, 1901 (Trematoda: Brachylaimidae) are parasites of bird... more Members of the genus Glaphyrostomum Braun, 1901 (Trematoda: Brachylaimidae) are parasites of birds. However, an exception occurs in Glaphyrostomum soricis Asakawa, Kamiya and Ohbayashi, 1988, which was described from the longclawed shrew, Sorex unguiculatus Dobson, 1890, in Hokkaido, Japan. A recent DNA barcode-based trematode survey of land snails clearly showed that Ainohelix editha (A. Adams, 1868), a bradybaenid snail indigenous to Hokkaido, serves as the first and second intermediate hosts for a species of the genus Pseudoleucochloridium Pojmańska, 1959 (Panopistidae). Its adult stage was furthermore confirmed from S. unguiculatus. A comparison of adult morphology between Pseudoleucochloridium sp. and G. soricis revealed that both should be considered the same species. However, Pseudoleucochloridium soricis comb. nov. cannot be applied because P. soricis (Sołtys, 1952) already exists as the type species of the genus. We, therefore, propose Pseudoleucochloridium ainohelicis nom. nov. as a replacement name for G. soricis.
Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu, 2000
酪農学園大学紀要. 自然科学編, Apr 1, 2005
Japanese Journal of Ornithology, Oct 24, 2022
Japanese journal of zoo and wildlife medicine, 2015
Chihiro HASHIMOTO 1) ，Tatsuya YAMAMOTO 2) ，Eriko SAITO 2) ，Tomoo YOSHINO 1, 3) ， Yukari SOTOHIRA ... more Chihiro HASHIMOTO 1) ，Tatsuya YAMAMOTO 2) ，Eriko SAITO 2) ，Tomoo YOSHINO 1, 3) ， Yukari SOTOHIRA 4) ，Shigehisa KAWAKAMI 2) ，Mitsuhiko ASAKAWA 1) ＊
酪農学園大学紀要. 自然科学編, Feb 1, 1989
Bulletin of the Biogeographical Society of Japan, 2013
Veterinary Record, May 1, 2006
THE common dormouse (Muscardinus avellanarius) is a rare woodland mammal that appears to have dec... more THE common dormouse (Muscardinus avellanarius) is a rare woodland mammal that appears to have declined substantially in Britain during the past century (Bright and Morris 2002). A conservation initiative in England is reintroducing dormice to suitable habitats where they are absent (Bright and Morris 2002) and supporting the species at sites where it is still found (Bright and Morris 1996). The diseases and parasites of common dormice have rarely been described. Ocular disease associated with Rhabditis orbitalis nematodes has been detected in one common dormouse, possibly associated with management practices in woodland (Sainsbury and others 1996). Another nematode, Richtularia cristata (Skryabin and others 1967), has also been recorded, and cestodes and trematodes have been described, although not in association with disease (Matskasi and others 1996). When wild animals are translocated to return them to the free-living state, it is important to carry out a health risk assessment (Leighton 2002) to ensure that changes in hostparasite encounters brought about by the move do not result in harm through infectious disease outbreaks. It is thus essential to know the status of the species in terms of infectious agents harboured by both captive and wild animals, as well as having information on the parasites recorded in the species in the past. Heligmosomoides polygyrus, an intestinal trichostrongylid nematode, is a common parasite of wild rodents throughout the Holarctic region, including many species belonging to the subfamilies Murinae and Microtinae and two species from the Cricetinae family (Durette-Desset and others 1972, Quinnell and others 1991, Asakawa 1995). This short communication, describes the first observation of H polygyrus infestation in the common dormouse. A female common dormouse (dormouse 1) arrived from another captive collection on May 3, 2001, in a consignment of over 35 common dormice, and was housed at Paignton Zoo, either in a 1 m3 wire mesh cage or a glass-sided tank approximately 0·75 x 0·25 x 0·5 m, with woodchip bedding, an array of branches for climbing and a wooden nestbox with hay for bedding. On the same day, a faecal sample was collected from another female common dormouse (dormouse 2) already present at Paignton Zoo and housed as above, and examined for pathogenic bacteria by culture on horse blood agar (QCM Laboratories), XLD agar (QCM Laboratories) following selenite broth enrichment, and CCDA medium (QCM Laboratories). A faecal smear was stained with modified Ziehl-Neelsen stain for the detection of cryptosporidia, microsporidia and mycobacteria. The faecal sample was also examined for parasites using direct microscopy. No significant bacteria were detected but numerous ova and adult nematodes were observed. Eight of 32 faecal samples collected from individual common dormice or groups of dormice on the same day at Paignton Zoo were positive for strongyle nematode ova. Eight days later, 0·28 mg praziquantel (Droncit; Bayer) and 5 μg ivermectin (Ivomec injection for cattle; Merial) diluted 1:20 in propylene glycol were adminVeterinary Record (2006) 158, 667-668
Journal of Veterinary Medical Science, 2021
Oarfish (Regalecus russelii Cuvier) are mesopelagic fish with little known about their life histo... more Oarfish (Regalecus russelii Cuvier) are mesopelagic fish with little known about their life history. Oarfish live in deep water, making it difficult for researchers to collect specimens; thus, records of their parasitic helminths are limited. Two plerocercoids were found for the first time in an oarfish stranded on the coast of Akita Prefecture, Japan. These plerocercoids were identified as Clistobothrium sp. RR-1 using morphological and molecular analyses. It was revealed that oarfish represent one of the intermediate hosts of the genus Clistobothrium, and large sharks are the definitive hosts for these parasites.
Nihon Senchū Gakkaishi, Sep 20, 2019
A red-crowned crane, Grus japonensis, chick died on August , , in Kushiro, Hokkaido, Japan. In th... more A red-crowned crane, Grus japonensis, chick died on August , , in Kushiro, Hokkaido, Japan. In the postmortem examination, individual nematodes were found in the nasal cavity and anterior thoracic air sacs. The chick died from severe inf lammation of the air sacs, granulomatous pneumonia, and esophageal strangulation, caused by a heavy nematode infection. The nematodes were identified as Cyathostoma (Hovorkonema) sp., based on their measurements and morphological characteristics. This is the first host record of these nematodes from G. japonensis and the first geographical record from Japan. Considering the life cycle, the chick was infected with the nematodes by ingestion of earthworms, because the chick had been given many earthworms as food from the parents. Nematol. Res. (),- .
Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu, 2007
Kikai Zairyou, Zairyou Kakou Gijutsu Kouenkai kouen rombunshuu, 2004