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Featured researches published by Tatsuya Kariya.


Mammal Study | 2009

Lack of sequence variation of Y chromosome-linked loci in Steller's sea lions (Eumetopias jubatus) from Iony Island and the Kuril Islands

Tatsuya Kariya; Makoto Igarashi; Kazuo Wada; Vladimir N. Burkanov; Satoshi Koyama; Hiroshi Hoshino; Tatsuo Oshida

The Y chromosome-linked (Y-linked) genetic markers are important for understanding historical patterns of male dispersal (e.g., Tucker and Lundrigan 1996). Especially, the sex-determining region of the Y gene (SRY) is used as a marker to resolve phylogeography, population structure, and population dynamics of wild mammals (Hurles and Jobling 2001; Petit et al. 2002). For instance, Iwasa and Suzuki (2002) reported that SRY variation in Japanese red-backed moles (Eothenomyce andersonii) showed substantial geographic distribution. Geraldes et al. (2005) found high levels of nucleotide diversity in the SRY of European rabbits (Oryctolagus cuniculus). Moreover, Y-linked introns such as the DEAD/H (Asp-Glu-Ala-Asp/His) box polypeptide of the Y chromosome (DBY) and the histocompatibility Y antigen gene (SmcY) may be effective markers in phylogeographical study (e.g., Underhill et al. 2001). Steller’s sea lion Eumetopias jubatus (Schreber, 1776), a highly vagile marine mammal breeding in rookeries (e.g., Nowak 1999), is distributed along rocky continental coasts and near-shore islands from Northern California, through the Gulf of Alaska, along the Aleutian Islands, to the Kamchatka Peninsula, Kuril Islands, and the Sea of Okhotsk (Loughlin et al. 1992; Abe et al. 2005; Burkanov and Loughlin 2005; Wilson and Reeder 2005). Pups disperse from their natal rookeries within a year of their birth. Most adults, however, generally remain within 500 km of their natal rookeries (RaumSuryan and Pitcher 2002). Female Steller’s sea lions show strong enough philopatry to create a matrilineal substructure, as shown by mitochondrial DNA (mtDNA) lineage (Bickham et al. 1998), similar to that of the Atlantic walrus Odobenus rosmarus (Anderson et al. 1998) and the harbor seal Phoca vitulina (Stanley et al. 1996). In fact, there are three main geographical mtDNA lineages of the Steller’s sea lion: ‘eastern’ (California to the southeastern Gulf of Alaska), ‘western’ (Prince William Sound to the Commander Islands), and ‘Asian’ (Kamchatka Peninsula, Kuril Islands, and Sea of Okhotsk) (Bickham et al. 1998; Harlin-Cognato et al. 2006). Within local populations, genetic divergences of mtDNA sequence among rookeries are also recognized (Baker et al. 2005). Unlike mtDNA phylogeography, a study (Hoffman et al. 2006a) using autosomal microsatellites found that there was no clear genetic divergence between western and Asian stocks, suggesting that the phylogeographical difference between mtDNA and microsatellites studies was the result of higher dispersal rates by males. Male Steller’s sea lions tend to disperse longer distances from their natal rookeries (Raum-Suryan and Pitcher 2002). Consequently, greater male-mediated gene flow would explain the differences in pattern. Therefore, Y-chromosomal markers would provide an enhanced description of male-mediated gene flow. On the other hand, since Steller’s sea lion is gregarious and polygynous (e.g., Nowak 1999), the many offspring of a


Mammal Study | 2008

Mitochondrial cytochrome b gene sequence diversity among Steller’s sea lion rookeries in the Kuril Islands and the Sea of Okhotsk

Tatsuya Kariya; Makoto Igarashi; Kazuo Wada; Vladimir N. Burkanov; Satoshi Koyama; Hiroshi Hoshino; Tatsuo Oshida

1 National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan 2 Primate Research Institute, Kyoto University, Inuyama 484-8506, Japan 3 National Marine Mammal Laboratory, AFSC, NMFS, NOAA 7600 Sand Point Way, NE, Building 4, Seattle, WA 98115, USA 4 Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai, Fuchu, Tokyo 183-8509, Japan 5 Graduate school of Fisheries Sciences, Division of Marine Environment and resources, Hokkaido University, Hakodate 041-8611, Japan 6 Laboratory of Wildlife Ecology, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan


Bioelectromagnetics | 2005

Effects of a 50 Hz electric field on plasma lipid peroxide level and antioxidant activity in rats

Shinji Harakawa; Noboru Inoue; Takuya Hori; Koji Tochio; Tatsuya Kariya; Kunihito Takahashi; Fuyuki Doge; Hiroshi Suzuki; Hideyuki Nagasawa


Journal of Veterinary Medical Science | 2008

High Seroprevalence of Encephalitozoon cuniculi in Pet Rabbits in Japan

Makoto Igarashi; Eiji Oohashi; George Dautu; Akio Ueno; Tatsuya Kariya; Koji Furuya


Journal of Veterinary Medical Science | 2005

Effects of Exposure to a 50 Hz Electric Field on Plasma Levels of Lactate, Glucose, Free Fatty Acids, Triglycerides and Creatine Phosphokinase Activity in Hind-Limb Ischemic Rats

Shinji Harakawa; Noboru Inoue; Takuya Hori; Koji Tochio; Tatsuya Kariya; Kunihito Takahashi; Fuyuki Doge; David E. Martin; Atsushi Saito; Hiroshi Suzuki; Hideyuki Nagasawa


Journal of Veterinary Medical Science | 2007

Seroepidemiology of Toxoplasma gondii and Neospora caninum in Seals around Hokkaido, Japan

Kei Fujii; Chiharu Kakumoto; Mari Kobayashi; Sachiko Saito; Tatsuya Kariya; Yukiko Watanabe; Xuenan Xuan; Ikuo Igarashi; Masatsugu Suzuki


Experimental Parasitology | 2008

Toxoplasma gondii: Detection of MIC10 antigen in sera of experimentally infected mice

George Dautu; Akio Ueno; Aracelis Miranda; Sophie Mwanyumba; Biscah Munyaka; Gabriella Carmen; Tatsuya Kariya; Yoshitaka Omata; Atsushi Saito; Xuenan Xuan; Makoto Igarashi


Endangered Species Research | 2014

Population trends of the Kuril harbour seal Phoca vitulina stejnegeri from 1974 to 2010 in southeastern Hokkaido, Japan

Yumi Kobayashi; Tatsuya Kariya; Jun Chishima; Kei Fujii; Kazuo Wada; Shinya Baba; Tetsuro Itoo; Toshiyasu Nakaoka; Miki Kawashima; Sachiko Saito; Noriyuki Aoki; Shin ichi Hayama; Yuichi Osa; Hidemi Osada; Akio Niizuma; Masatsugu Suzuki; Yohjiro Uekane; Kei Hayashi; Mari Kobayashi; Noriyuki Ohtaishi; Yasunori Sakurai


Journal of Veterinary Medical Science | 2007

Serological Evidence of Influenza A Virus Infection in Kuril Harbor Seals (Phoca vitulina stejnegeri) of Hokkaido, Japan

Kei Fujii; Chiharu Kakumoto; Mari Kobayashi; Sachiko Saito; Tatsuya Kariya; Yukiko Watanabe; Yoshihiro Sakoda; Hiroshi Kida; Masatsugu Suzuki


Japanese Journal of Veterinary Research | 2006

Seroepidemiological survey of morbillivirus infection in Kuril harbor seals (Phoca vitulina stejnegeri) of Hokkaido, Japan

Kei Fujii; Hiroki Sato; Chiharu Kakumoto; Mari Kobayashi; Sachiko Saito; Tatsuya Kariya; Yukiko Watanabe; Yoshihiro Sakoda; Chieko Kai; Hiroshi Kida; Masatsugu Suzuki

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Makoto Igarashi

Obihiro University of Agriculture and Veterinary Medicine

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Mari Kobayashi

Tokyo University of Agriculture

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Sachiko Saito

Obihiro University of Agriculture and Veterinary Medicine

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Hideyuki Nagasawa

Obihiro University of Agriculture and Veterinary Medicine

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Kazuo Wada

Primate Research Institute

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Noboru Inoue

Obihiro University of Agriculture and Veterinary Medicine

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Shinji Harakawa

Obihiro University of Agriculture and Veterinary Medicine

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Takuya Hori

Obihiro University of Agriculture and Veterinary Medicine

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