Yuzuru Hamada

Biographic Data

ID112900
NAMEYuzuru Hamada
GIVEN NAMESYuzuru
FAMILY NAMEHamada
SIGNATUREHAMADA Y
AFFILIATIONSKyoto University
VERIFIEDNo
TOTAL WORKS66
TOTAL CITATIONS75
AUTHOR COUNT66
EDITOR COUNT0
FIRST PUBLICATION YEAR1982
LATEST PUBLICATION YEAR2024
H-INDEX5

  • Influence of Covid‐19 on the emergence of stone‐tool use behavior in a population of common long‐tailed macaques ( Macaca fascicularis fascicularis ) in Thailand

    Open AccessRaza Muhammad, Titiporn Kaikaew et al.ARTICLEAmerican Journal of Primatology2024

    Stone tool use is a rare behavior across nonhuman primates. Here we report the first population of common long‐tailed macaques ( Macaca fascicularis fascicularis ) who customarily used stone tools to open rock oysters ( Saccostrea forskali ) on a small island along the Thai Gulf in Koh Ped (KPE), eastern Thailand. We observed this population several times during the past 10 years, but no stone‐tool use behavior was observed until our survey durin…

  • Evolution of humans in view of maxillary canine morphology

    Open AccessHiroyuki Yamada, M Nakatsukasa et al.ARTICLEAnthropological Science2022References: 165

    オスの上顎犬歯の大きさと形態について進化過程の構築を試みた。結果を以下に示す。(1):現生および化石類人猿段階から現代人へ至る歯冠サイズの小型化は後期中新世のサヘラントロプスおよびオロリンの時代にすでに始まり,この傾向は現代人に至るまで続いている。(2):尖頭観では現生・化石類人猿で主に近遠心方向に長い卵形をしている。アファレンシス猿人以降では唇舌方向に長い形が主流になる。(3):舌側面観では現生・化石類人猿で主に底辺が幅広で丈の高い歪三角形をしている。例外的にウーラノピテクスでは歪四角形をしている。ヒト族では五角形あるいは菱形が主流になる。(4):歯冠shoulderの位置は現生・化石類人猿では歯頸部にあるが,ヒト族では尖頭方向へ移動している。(5):近心切縁溝は現生・化石類人猿では長く深い溝,カダバ猿人からアフリカヌス猿人では近心の切縁溝と辺縁溝が合流し,エレクトス原人以降では近心辺縁溝のみからなる。(6):辺縁隆線は現生・化石類人猿では短い。ウーラノピテクスとヒト族では尖頭方向に長…

  • Prevalence of Enterobacteriaceae in Wild Long-Tailed Macaques (Macaca fascicularis) in Thailand

    Open AccessKrishna N Balasubramaniam, Suchinda Malaivijitnond et al.ARTICLEInternational Journal of…2021References: 4

    An expanding human population has increased the risk of zoonosis (Devaux et al. 2019), particularly between humans and wild primates, given our close evolutionary histories and shared ecologies (Fuentes and Hockings 2010). Among the major classes of zoonotic agents, some enteropathogenic bacteria (family Enterobacteriaceae) can cause lethal diarrheal disease and pose a serious threat to all primates (McLennan et al. 2018). Enterobacteriaceae may …

  • Craniofacial Shape and Nonmetric Trait Variation in Hybrids of the Japanese Macaque (Macaca fuscata) and the Taiwanese Macaque (Macaca cyclopis)

    Open AccessCeridwen Boel, Darren Curnoe et al.ARTICLEInternational Journal of…2019Cited by: 1References: 79

  • The Japan Monkey Centre Primates Brain Imaging Repository for comparative neuroscience

    Open AccessTetsuya Sakai, Tomoko Sakai et al.ARTICLEPrimates2018

    Advances in magnetic resonance imaging (MRI) and computational analysis technology have enabled comparisons among various primate brains in a three-dimensional electronic format. Results from comparative studies provide information about common features across primates and species-specific features of neuroanatomy. Investigation of various species of non-human primates is important for understanding such features, but the majority of comparative …

  • Mitochondrial DNA and two Y‐chromosome genes of common long‐tailed macaques ( Macaca fascicularis fascicularis ) throughout Thailand and vicinity

    Open AccessSrichan Bunlungsup, Hiroo Imai et al.ARTICLEAmerican Journal of Primatology2017

    Macaca fascicularis fascicularis is distributed over a wide area of Southeast Asia. Thailand is located at the center of their distribution range and is the bridge connecting the two biogeographic regions of Indochina and Sunda. However, only a few genetic studies have explored the macaques in this region. To shed some light on the evolutionary history of M. f. fascicularis, including hybridization with M. mulatta, M. f. fascicularis and M. mulat…

  • Genetic analysis of samples from wild populations opens new perspectives on hybridization between long‐tailed ( Macaca fascicularis ) and rhesus macaques ( Macaca mulatta )

    Open AccessSrichan Bunlungsup, Sree Kanthaswamy et al.ARTICLEAmerican Journal of Primatology2017

    In the past decade, many researchers have published papers about hybridization between long-tailed and rhesus macaques. These previous works have proposed unidirectional gene flow with the Isthmus of Kra as the zoogeographical barrier of hybridization. However, these reports analyzed specimens of unknown origin and/or did not include specimens from Thailand, the center of the proposed area of hybridization. Collected specimens of long-tailed and …

  • Age‐related changes of sulcal imprints on the endocranium in the Japanese macaque (Macaca fuscata)

    Open AccessNguyen Van Minh, Yuzuru HamadaARTICLEAmerican Journal of Physical…2017Cited by: 1References: 58

    OBJECTIVES: The degree of expression of sulcal patterns on endocasts of nonhuman primates has been shown to depend primarily on species (brain size) and age of the individual. It has been suggested that brain details on endocasts are reproduced better in juvenile than adult primates. Here, we investigated age-related changes in the imprint of the major sulci on the endocranium of Japanese macaques (Macaca fuscata) from the juvenile period to adul…

  • An SNP marker at the STAT6 locus can identify the hybrids between rhesus (Macaca mulatta) and long-tailed macaques (M. fascicularis) in Thailand

    Open AccessJanya Jadejaroen, Yoshi Kawamoto et al.ARTICLEPrimates2016

  • Morphological characteristics and genetic diversity of Burmese long‐tailed Macaques ( Macaca fascicularis aurea )

    Open AccessSrichan Bunlungsup, Hiroo Imai et al.ARTICLEAmerican Journal of Primatology2016

    Macaca fascicularis aurea (Mfa) is the only macaque which has been recorded to use stone tools to access encased foods. They live in close contact with M. fascicularis fascicularis (Mff) in southwestern Thailand and the hybrids were reported [Fooden, 1995]. Although Mff and Mfa can be seen in the same habitat types, tool-use behavior has never been reported in Mff. Thus, comparing the morphological characteristics and genetics between Mfa and Mff…

  • Deciduous canine morphology in recent Japanese

    Open AccessHiroyuki Yamada, Y Kunimatsu et al.ARTICLEAnthropological Science2016References: 30

    現代日本人の乳犬歯の形態的特徴を調査した。資料は抜去歯46歯である。歯冠形質の観察は抜去歯の石膏模型で辺縁隆線,基底結節,棘突起,遠心副隆線を調査した。歯の計測はデジタルノギス(1/100 mm)を使い,歯冠近遠心径,唇舌径,歯根唇舌径,歯頸部エナメル質の膨らみ,歯冠高,近心shoulder高,CMSDを計測した。乳犬歯の歯冠形質をみると男児と女児はともによく似た形態をしていた。舌側面からみると,上顎では辺縁隆線および基底結節の出現頻度が永久犬歯よりも乳犬歯の方が高い。一方,棘突起と遠心副隆線は乳犬歯よりも永久歯の方が出現率は高い。下顎では全体に上顎よりも歯冠形質の表現型が弱い。歯冠サイズでは上顎の歯冠近遠心径と唇舌径で有意に女児の方が男児を上回っていた。それ以外の項目には男・女児間で有意な差はみられなかった。指数値でも上・下顎とも有意な性差はみられなかった。永久犬歯と比較してみると,乳犬歯は以下のように特徴づけられる。1)幅厚指数は100以下を示し,切縁からみた歯冠の外形は近遠心方向に…

  • Use of photogrammetry as a means to assess hybrids of rhesus (Macaca mulatta) and long-tailed (M. fascicularis) macaques

    Open AccessJanya Jadejaroen, Yuzuru Hamada et al.ARTICLEPrimates2015

  • Contribution of the maxillary sinus to the modularity and variability of nasal cavity shape in Japanese macaques

    Open AccessTsuyoshi Ito, Takeshi D Nishimura et al.ARTICLEPrimates2015

  • Assessment of the hybridization between rhesus ( M acaca mulatta ) and long‐tailed macaques ( M . fascicularis ) based on morphological characters

    Open AccessYuzuru Hamada, Aye Mi San et al.ARTICLEAmerican Journal of Physical…2015

    OBJECTIVES: Hybridization between rhesus (Macaca mulatta) and long-tailed (M. fascicularis) macaques has become a focal point of interest. The majority of such studies have evaluated their genetics, but not their morphological characters. MATERIALS AND METHODS: We analyzed morphological characters of eight free-ranging populations of Indochinese rhesus and long-tailed macaques distributed at the proposed hybrid zone (15.75-21.58° N) in comparison…

  • Aging-related changes in the skulls of Japanese macaques (Macaca fuscata)

    Open AccessNguyen Van Minh, Toshio Mouri et al.ARTICLEAnthropological Science2015Cited by: 2References: 4

    We investigated aging-related changes in the skulls of Japanese macaques (Macaca fuscata). A total of 145 (70 males, 75 females) skulls from macaques aged 7.0–26.9 years (males) and 7.0–30.7 years (females) were measured for 22 craniometric items. Some skull dimensions increased from young adulthood (7.0 years) to the peak at 13.3–19.0 years in males and at 19.7–22.6 years in females. Some dimensions remained at their peak value right through int…

  • Canine crown morphology and sexual dimorphism in the Great apes

    Open AccessHiroyuki Yamada, Yuzuru Hamada et al.ARTICLEAnthropological Science2015Cited by: 1References: 30

    大型類人猿における犬歯形態と性的二型を明らかにすることを目的に研究を行った。資料は各博物館・研究所に所蔵されている大型類人猿(オランウータン,ゴリラ,チンパンジー,ボノボ)の頭蓋骨に植立している犬歯の超硬石膏模型である。大型類人猿の犬歯の歯冠サイズはオスが大きく,メスは小さい。舌側面からみた歯冠概形は4種とも上顎がオスで底辺の広い二等辺三角形,メスで正三角形を,下顎は雌雄とも不正四辺形を呈す。雌雄とも近心shoulderの位置は上顎のほうが下顎よりも歯頸寄りに,また浮彫像では上顎犬歯で近心半部に近心舌側隆線が,下顎では遠心舌側へ遠心舌側面隆線が走行する。4種で比較すると,オランウータンはオスで歯表面に皺が多いこと,また歯冠と歯根がスムーズに移行し,歯頸部にくびれがないことが特徴的である。ゴリラではオスの上顎犬歯の歯頸隆線の発達が弱いこと,および下顎犬歯の近心舌側面窩にある切痕が強いことが特徴であり,Pan属の2種で雌雄とも上顎犬歯の遠心shoulderが近心shoulderの位置と同等か…

  • Preliminary study of the genetic diversity of eastern Assamese macaques (Macaca assamensis assamensis) in Thailand based on mitochondrial DNA and microsatellite markers

    Open AccessManakorn Sukmak, Suchinda Malaivijitnond et al.ARTICLEPrimates2014

  • Canine crown morphology and sexual dimorphism in the Hylobates lar

    Open AccessHiroyuki Yamada, Yuzuru Hamada et al.ARTICLEAnthropological Science2014Cited by: 1References: 30

    小型類人猿シロテテナガザル(Hylobates lar)について犬歯形態の詳細な記載と大きさの性的二型性を明らかにすることを目的に研究を行った。テナガザルの犬歯は従来いわれているように性的二型性が小さく,雌雄間で形態が非常によく似ている。歯冠頬側面の概形は上顎犬歯でサーベル形,下顎犬歯は不正四辺形を呈する。オスに較べてメスの形態特徴を挙げると,1)サイズが小さい,2)歯冠浮彫像の発達が弱く,全体に丸みを帯びている,3)下顎犬歯の近心shoulderの位置が歯冠高の約1/2にある,4)歯頚隆線がよく発達していることである。歯冠サイズによる犬歯の性差では,上・下顎の歯冠基底部のサイズや歯冠高でオスの方が有意に大きい。一方,下顎犬歯では歯冠近遠心径に対する歯頚部エナメル質の膨らみはメスの方が大きく,有意に強い性差を示す。歯冠の高径,とくに下顎犬歯の尖頭から近心shoulderまでの距離が最も強い性差を示す。犬歯の形態やサイズに性的二型がみられることはペア社会を構成するテナガザルでもある程度雌雄…

  • Characteristics of stable isotope signature of diet in tissues of captive Japanese macaques as revealed by controlled feeding

    Open AccessRumiko Nakashita, Yuzuru Hamada et al.ARTICLEPrimates2013

  • Canine crown morphology and sexual dimorphism in the Pan paniscus

    Open AccessHiroyuki Yamada, Yuzuru Hamada et al.ARTICLEAnthropological Science2013Cited by: 1References: 21

    霊長類の犬歯は形態が単純なため,系統学的にあまり有効ではないと考えられてきた。しかし,犬歯形態には重要な形態的特徴が含まれている。アフリカに棲息する大型類人猿の一種で,ヒトに近縁であるPan paniscus(ボノボ)について犬歯の形態特徴を明らかにし,性的二型の程度をみること,個体変異を明らかにすること,人類との類似性を探ることを目的にこの研究を行った。資料はベルギーのTervurenにある王立中央アフリカ博物館に所蔵されているボノボの頭蓋骨と下顎骨に植立している犬歯である。オスとメスの歯冠の形態を比較してみると,ボノボは大きさだけでなく歯冠形態にも性的二型が現れることが分かった。上顎:歯冠高はオスが高いため舌側面からみた概形は二等辺三角形,メスは低いことから正三角形を呈す。オス・メスとも頬舌側の歯頚線は歯根側へやゝ凸湾しているか直線的である。オスの近心shoulderは歯頚1/5のところにある。近心切縁溝は深い。中心溝は尖頭から歯頚線まで走る。発達した遠心舌側隆線が歯冠1/2あたりか…

  • Boundary zone between northern and southern pig-tailed macaques and their morphological differences

    Open AccessSuchinda Malaivijitnond, Visit Arsaithamkul et al.ARTICLEPrimates2012

  • Tubular anomalous bones found in both thighs of a long-tailed macaque (Macaca fascicularis)

    Open AccessYuzuru Hamada, Junmei Sawada et al.ARTICLEPrimates2012

  • Variability of tail length in hybrids of the Japanese macaque (Macaca fuscata) and the Taiwanese macaque (Macaca cyclopis)

    Open AccessYuzuru Hamada, Ayumi Yamamoto et al.ARTICLEPrimates2012

  • A photogrammetric method to evaluate nutritional status without capture in habituated free-ranging Japanese macaques (Macaca fuscata)

    Open AccessHiroyuki Kurita, Takafumi Suzumura et al.ARTICLEPrimates2012

  • Comparative Functional Morphology in Primates

    Open AccessYuzuru Hamada, Eishi Hirasaki et al.ARTICLEInternational Journal of…2010