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博士論文
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DOI[10.14943/doctoral.k12692]のデータに遷移します
Morphological and population genetical studies on the red fox (Vulpes vulpes) of Hokkaido Island
- 国立国会図書館永続的識別子
- info:ndljp/pid/11063814
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- In Chapter I , diversity of the red fox on Hokkaido Island was evaluated in morphological aspect. T o investigate the morphological variation in an is...
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デジタル
- 資料種別
- 博士論文
- タイトル
- 著者・編者
- 天池, 庸介
- 著者標目
- 出版年月日等
- 2017-03-23
- 出版年(W3CDTF)
- 2017-03-23
- 並列タイトル等
- キタキツネ集団の形態学的および集団遺伝学的研究
- 寄与者
- 増田, 隆一堀口, 健雄小亀, 一弘高木, 昌興柁原, 宏
- 授与機関名
- 北海道大学
- 授与年月日
- 2017-03-23
- 授与年月日(W3CDTF)
- 2017-03-23
- 報告番号
- 甲第12692号
- 学位
- 博士(理学)
- 博論授与番号
- 甲第12692号
- 本文の言語コード
- eng
- NDC
- 対象利用者
- 一般
- 一般注記
- In Chapter I , diversity of the red fox on Hokkaido Island was evaluated in morphological aspect. T o investigate the morphological variation in an island population of the red fox ( Vulpes vulpes ), 25 cranial and 24 dental characters were measured for 225 specimens (137 males and 88 females) from Hokkaido Island, Japan. A Bayesian principal component analysis found only small differences among three groups identified genetically in previous studies. Concretely, analyses of variance and post -hoc tests detected clear differences in two functionally important measurements: postorbital constriction and upper fourth premolar length. In the postorbital const riction, relating to size of the temporal muscle, a difference with a gradient of increase from west to east on Hokkaido Island was found in both sexes. In the upper fourth premolar length, relating to body size, a difference between the Southern and Centr al groups was found in both sexes. Additionally, in differences in four measurements of skull width, skull height, mastoid width, and occipital condyle width, relating to braincase, were detected in only male. Subsequently, a correlation analysis showed that the postorbital constriction might be related to climatic conditions (e.g., minimum mean monthly temperature and snowfall). Endemic climate conditions and food habits appeared to contribute to the observed geographical variation in skull morphology. In Chapter II , population genetic diversity of the red fox on Hokkaido Island was evaluated using the genotypes of the major histocompatibility complex (MHC ) gene as adaptive marker. To assess the genetic diversity of the population of the red foxes living on Hokkaido Island genotypes of the MHC class II DRB gene were examined for 232 individuals. As a result, 17 novel alleles of DRB exon 2 were identified from the fox es. In addition, it was found that the fox population of southern Hokkaido was genetically differentiated from those of central and eastern Hokkaido, possibly resulting from ecological and geographical isolation in southern Hokkaido. In addition, non- synony mous substitution rates exceeded synonymous substitution rate s in antigen binding sites (ABS) of DRB exon 2, indicat ing that the red fox DRB alleles have evolved under positive selection. The Bayesian phylogenetic analysis with alleles of other canids showed that most DRB alleles in the red fox were grouped into “ fox -like canids clade” , and t hat trans -species polymorphism was evident. This suggests that these alleles have evolved under balancing selection. In Chapter III , genetic structure and population dynamics were investigated for the fox population isolated on Mt. Hakodate . Microsatellite genotypes of fecal samples, which were noninvasively collected from Mt. Hakodate for three years (2009–2011) , were analyzed . Based on successfully obtained genotypes, 35 foxes we re identified as 16 males, 13 females and 6 unknowns . The estimated population sizes were 20 in 2009, 5 in 2010, and 44 in 2011. Fox density in each year was found to be larger than that in rural area s previous ly reported, and t hose in the urban fox of Zurich, Switzerland, which was internationally famous for hig h density. The comparison of genetic distance and structure showed that the Mt. Hakodate population was differentiated from the other Hokkaido populations and strictly isolated by the sea and rural area as geographical barrier . Even small home ranges were overlapped between foxes. The results suggest that the fox population on this mountain has been maintained by the food diversity and abundance of anthropogenic food resource.(主査) 教授 増田 隆一, 教授 堀口 健雄, 教授 小亀 一弘, 教授 高木 昌興, 准教授 柁原 宏理学院(自然史科学専攻)
- DOI
- 10.14943/doctoral.k12692
- 国立国会図書館永続的識別子
- info:ndljp/pid/11063814
- コレクション(共通)
- コレクション(障害者向け資料:レベル1)
- コレクション(個別)
- 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
- 収集根拠
- 博士論文(自動収集)
- 受理日(W3CDTF)
- 2018-04-03T03:53:09+09:00
- 作成日(W3CDTF)
- 2017-03
- 記録形式(IMT)
- PDF
- オンライン閲覧公開範囲
- 国立国会図書館内限定公開
- デジタル化資料送信
- 図書館・個人送信対象外
- 遠隔複写可否(NDL)
- 可
- 連携機関・データベース
- 国立国会図書館 : 国立国会図書館デジタルコレクション