Yamato Tsuji

Yamato Tsuji
Ishinomaki Senshu University · Department of Science and Engineering

Professor

About

96
Publications
11,483
Reads
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1,006
Citations
Citations since 2016
45 Research Items
627 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Additional affiliations
February 2016 - January 2021
Kyoto University
Position
  • Proffessor (Assistant)

Publications

Publications (96)
Article
Full-text available
Nationwide depopulation in modern Japan has led to contrasting changes over the last half‐century: shrinking human communities and recovering populations of Japanese macaques (Macaca fuscata). These changes have triggered macaque damage to public livelihoods, often resulting in decision‐making directed toward strictly regulating macaque populations...
Article
We analyzed fecal contents of wild Japanese macaques (Macaca fuscata) inhabiting Kurobe Gorge, mountain region of central Japan, by the point-frame method. We then compared the macaques’ winter diets with other study sites. Between 2011 and 2020, we collected macaque feces at three areas, a cave, a tunnel, and along mountain trails on steep slopes....
Article
Dung beetles attracted to the feces of wild Japanese macaques (Primates: Macaca fuscata Blyth) were studied at two temperate sites in Japan, Kinkazan (dominated by deciduous forest) and Yakushima (dominated by evergreen forest), to determine if temporal variations occur in the dung beetle community. Data from 428 pitfall traps baited with fresh Jap...
Article
Information on the food habits of wild Japanese macaques (Macaca fuscata) is typically obtained from behavioral observation. Dietary information obtained from feces, for which few Japanese primatologists have paid attention, is also useful. Collecting information on dietary habits through both fecal analyses and behavioral observation enables us to...
Article
Full-text available
Infanticide is common among non-human primates. There are a few cases of infanticide reported in wild groups of the genus Macaca, but in Macaca fasicularis, it is only reported under captive conditions. The present report describes the first case of infanticide observed in wild M. fascicularis in Pangandaran Nature Reserve, West Java, Indonesia, in...
Article
The dietary composition of primates is often affected by the availability of food, as well as seasonal variations within their habitat. This study presents quantitative data on the feeding behavior of wild silvery lutungs ( Trachypithecus cristatus ) inhabiting a coastal forest in West Sumatra, Indonesia. This research emphasizes the relationship b...
Conference Paper
Full-text available
Primate’s time budgets are the important aspect to investigate their ecological influences in their habitat. This study collected data on daily activities in a group of silvery lutung (Trachypithecus cristatus) in coastal forest habitat at Gunung Padang, West Sumatra, Indonesia from August 2018 – July 2019, using instantaneous scan sampling method...
Article
Primates are popular species in wildlife tourism contexts and provide economic benefits to habitat countries where primate-based tourism activities are a part of the country’s tourism economy. Primate tourism runs a broad gamut from safari-like expeditions within remote primate habitats to designated monkey parks and incidental primate tourism. In...
Article
We reviewed previous literature on primate crop feeding in Asia. We found 134 reports from 14 different countries and regions. More than half of the crop feeding cases involved macaques, followed by colobines, especially common langurs, and to a lesser extent by orangutans. No crop feeding by gibbons, lorises, or tarsiers has been reported. Most re...
Article
We reviewed previous literature on primate crop feeding in Asia. We found 134 reports from 14 different countries and regions. More than half of the crop feeding cases involved macaques, followed by colobines, especially common langurs, and to a lesser extent by orangutans. No crop feeding by gibbons, lorises, or tarsiers has been reported. Most re...
Article
Full-text available
We observed interactions of group members with seven Javan lutungs ( Trachypithecus auratus ) infants from January to March 2018. Infants’ pelage colouration changed from bright yellow to black, and it took about 2.9 months (on average) until the yellowness disappeared, and about 6.1 months (on average) until the colouration change was completed. I...
Article
Full-text available
We compared the characteristics of seeds within faeces between semi-terrestrial Japanese macaques (Macaca fuscata) and sympatric arboreal Japanese martens (Martes melampus) in Shiga Heights, central Japan. We collected faecal samples of the two mammalian species for 1 year (n = 229 for macaques and n = 22 for martens). We then compared the proporti...
Article
To evaluate the effect of Japanese martens (Martes melampus) gutpassage on seed germination, a qualitative component of seed dispersal effectiveness, we fed the seeds of a liana, Actinidia arguta, to captive animals and compared the germination ratios between ingested seeds and seeds with their pulp removed artificially, and among seeds with pulp u...
Article
Full-text available
With 60% of all primate species now threatened with extinction and many species only persisting in small populations in forest fragments, conservation action is urgently needed. But what type of action? Here we argue that restoration of primate habitat will be an essential component of strategies aimed at conserving primates and preventing the exti...
Article
Seed dispersal is an ecological process crucial for forest regeneration and recruitment. To date, most studies on frugivore seed dispersal have used the seed dispersal effectiveness framework and have documented seed-handling mechanisms, dispersal distances and the effect of seed handling on germination. In contrast, there has been no exploration o...
Article
Full-text available
We use individual-based information on the behavior of wild female Japanese macaques in two consecutive years with different food availability (nut-rich vs. nut-poor) to test effects of dominance rank and nut fruiting on seed dispersal parameters. We predicted that social rank would affect dispersal (1) quantity, (2) quality, (3) species richness,...
Article
Full-text available
Priawandiputra W, Tsuji Y, Widayati KA, Suryobroto B. 2020. Dung beetle assemblages in lowland forests of Pangandaran Nature Reserve, West Java, Indonesia. Biodiversitas 21: 497-504. Dung beetles play crucial role in forest ecosystem, but no information on the dung beetle fauna has been reported in lowland forest of Java Island, Indonesia. Panganda...
Article
This study investigated the seasonal dietary habits of wild Javan lutungs (Trachypithecus auratus) inhabiting the secondary-plantation mixed forest of Pangandaran Nature Reserve, West Java, Indonesia, in relation to vegetation composition and phenology. We conducted behavioral observations of a habituated group for 16 non-consecutive months. The lu...
Article
Colugos (order Dermoptera) are medium-sized nocturnal arboreal eutherian euarchontan mammals, which glide, climb vertically and hang from different arboreal substrates in the rainforests of Southeast Asia. Their close phylogenetic position to either Primates (as Primatomorpha) or Scandentia (as Sundatheria) renders them significant for understandin...
Article
Full-text available
Akbar MA, Rizaldi, Novarino W, Perwitasari-Farajallah D, Tsuji Y. 2019. Activity budget and diet in silvery lutung Trachypithecus cristatus at Gunung Padang, West Sumatra, Indonesia. Biodiversitas 20: 719-724. We studied the activity budget and diet of a group of wild silvery lutungs (Trachypithecus cristatus) in Gunung Padang, West Sumatra, Indone...
Article
Full-text available
We attached GPS telemeters to wild Malayan flying lemurs, or colugos (Galeopterus variegatus) (n = 3, one adult male, one adult female, one juvenile male) in Pangandaran Nature Reserve, West Java, Indonesia in August 2018, to preliminary evaluate their home range size and characteristics, paying special attention to relationships with forest struct...
Technical Report
In ecology, the study of age-sex-class differences is useful for understanding foraging tactics of target species. However, few studies have addressed this in Asian colobines. In this study, we undertook a preliminary field survey over a period of two months in 2016 in the Pangandaran Nature Reserve, West Java, Indonesia, to compare the activity bu...
Article
Full-text available
We studied the crop species damaged by wild Japanese macaques (Macaca fuscata), including those found in orchards and forests, as well as garden plants, grain crops, and vegetables, to estimate the number of crop species damaged by this species across Japan. This information is useful for fundamental and applied studies of this species. Through a w...
Article
近年,愛知県北西部でニホンカモシカ(Capricornis crispus)の目撃事例が相次いでいる.本報告では,過去に愛知県が実施した聞き取り調査で生息が確認されなかった犬山市を中心に,県北西部のカモシカの生息に関する情報を収集した.その結果,7市町(名古屋市(守山区)・春日井市・瀬戸市・尾張旭市・東郷町・犬山市・小牧市)から17件の情報が収集された.このうち,尾張旭市(初記録は2011年),東郷町(同2013年),犬山市(同2014年)での目撃例は,2015年に実施された愛知県による最新の聞き取り調査では記録がなかった.これらの自治体では過去にカモシカの目撃例がないことから,2010年から2015年の間に同市町に侵入した可能性が高い.さらに2017年には小牧市でも目撃情報が得られ,201...
Article
Full-text available
1. We reviewed dietary data in the literature for Japanese martens Martes melampus from 21 study sites covering the entire geographic range of the species, tested for differences in the diets of martens in evergreen and deciduous forests, and described variation in main diets and dietary diversity in relation to geographical and environmental varia...
Article
We studied the behavioral ecology of provisioned long-tailed macaques (Macaca fascicularis) in Padang, West Sumatra, Indonesia, to examine how temporal changes in food provisioning within a day affect macaque activity. We conducted a field survey from October 2015 to January 2016 at two different sites: Gunung Meru (GM) and Gu- nung Padang (GP),...
Article
For many primates, sweet taste is palatable and is an indicator that the food contains carbohydrates, such as sugars and starches, as energy sources. However, we have found that Asian colobine monkeys (lutungs and langurs) have low sensitivity to various natural sugars. Sweet tastes are recognized when compounds bind to the sweet taste receptor TAS...
Article
Animals living in seasonal environments must adapt to a wide variation of temperature changes which requires flexible adjustments of time budget and metabolic processes for efficient thermoregulation. The Japanese macaque (Macaca fuscata) is one of only a handful of nonhuman primate species that experience seasonal climates over a wide temperature...
Article
In October 2015, large quantities of the feces from Japanese macaques (Macaca fuscata) were found within the gallery of the abandoned Nokado Mine in Nikko City, Tochigi Prefecture, central Japan. More than 100 feces specimens were concentrated in two narrow areas of 1-2 m² less than 8 m inward from the mine entrance. The feces were quite similar in...
Article
Full-text available
The role of primates in seed dispersal is well recognized. Macaques (Macaca spp.) are major primate seed dispersers in Asia, and recent studies have revealed their role as seed dispersal agents in this region. Here, we review present knowledge of the traits that define the role of macaques as seed dispersers. The size of seeds in fruit influences w...
Article
Primates play important roles as seed dispersers in many tropical ecosystems, such that studies of their seed dispersal services and impacts have gained interests among primatologists and ecologists in the past few decades. In this article, we first report that the number of scientific publications on primate seed dispersal has increased rapidly ov...
Article
Between August and October 2015, we found five carcasses of the wild Malayan flying lemurs (Galeopterus variegatus) in the Pangandaran Nature Reserve in West Java, Indonesia. Such short-term mortality events have never been reported for this species. In order to address the potential factors causing it, we firstly compared the estimated population...
Article
en Leaf monkeys are known to be leaf eaters, and thus, their potential role as seed dispersers has been neglected. However, they do also feed on fruits. To examine the role of leaf monkeys as endozoochorous seed dispersers, we studied the Javan lutung (Trachypithecus auratus) in Indonesia. We compared multiple aspects of seed dispersal processes (a...
Article
We studied long-tailed macaque (Macaca fascicularis) populations in Padang, West Sumatra, Indonesia, focusing on the effect of human provisioning on their demography and dietary composition. We conducted a field survey at three sites in the city: Gunung Meru, Gunung Padang, and Gunung Panggilun. Mean troop size (range 28–68) and infant ratio (range...
Article
To evaluate the seed shadow generated by wild Japanese martens (Martes melampus), we combined data on their ranging behavior from the northern foot of Mt. Fuji, central Japan (seven males and three females) with data on gut passage time obtained from martens in Toyama Municipal Family Park Zoo (three males and one female). The movement distances va...
Article
We observed a male Japanese macaque (Macaca fuscata) feeding on a foam nest of the Japanese tree frog (Rhacophorus arboreus). On 1st July 2013, an adult male (perhaps a solitary individual) fed on an egg mass twice at approximately 17:00 at Juni-ko lakes (Nagaike Pond), Shirakami Mountains. The monkey tore the egg mass apart by hand and ingested it...
Article
We observed an encounter between a reticulated python (Python reticulatus) and a group of wild Javan lutungs (Trachypithecus auratus mauritius) at the Pangandaran Nature Reserve, West Java, Indonesia. A python (about 2 m in length) moved toward a group of lutungs in the trees. Upon seeing the python, an adult male and several adult female lutungs b...
Article
Full-text available
A field survey was conducted in Pangandaran Nature Reserve (PNR), West Java, Indonesia between 2011 and 2015, during which fresh carcasses of wild mammals were collected. Body sizes of these carcasses were performed. This paper reports relevant data for future applications.
Article
Full-text available
Since the frequency method for animal food habits over-estimates or under-estimates food compositions, it is necessary to find the relationship between frequency evaluation and occupation evaluation. This analysis adopted the point-frame method for the Japanese marten Martes melampus. The results of both methods were compared against 289 fecal samp...
Article
Variation in seed shadows generated by frugivores is caused by daily, seasonal, and inter-annual variation in ranging, as well as inter-specific variability in gut passage times according to seed characteristics. We studied the extent to which seed weight, specific gravity, and daily (morning, afternoon, and evening) and inter-annual (2004 vs. 2005...
Article
1. We aimed to ascertain the environmental determinants of the diets of Japanese macaques Macaca fuscata in relation to geographical variables (latitude and elevation) and environmental variables [annual rainfall, mean temperature, snow characteristics and normalized difference vegetation index (NDVI), a proxy for primary productivity] 2. We collec...
Article
We observed an interspecies association between wild Javan lutungs (Trachypithecus auratus) and rusa deer (Rusa timorensis). In this association, the former drops plant items that the latter subsequently consumes (glean). We investigated whether the association is beneficial for deer that inhabit tropical regions characterized by drastic seasonal c...
Article
Full-text available
To examine the effects of food intake on the gastrointestinal passage time of seeds in the Japanese marten (Martes melampus), we conducted four feeding experiments using captive animals (n = 4). We estimated passage time variables (transit time and mean retention time) of plant seeds (two types) using two different numbers of chicks (single and thr...
Article
Food availability varies seasonally for wild animals, and body weight fluctuates accordingly in the wild. In contrast, controlling availability of diet under captive condition is difficult from keepers' standpoint, and monotonous diet often causes health problems in captive animals. We evaluated the effects of a seasonally controlled diet on body w...
Article
To investigate the activity budgets of Japanese martens (Martes melampus melampus), we conducted 24-hr video recording of captive adult animals (three males and one female). The martens spent a considerable amount of time (> 60% of sampling points) sleeping, and less time (17% on average) dashing. The activity rhythm varied among individuals; for t...
Article
Full-text available
Endozoochory is important to the dynamics and regeneration of forest ecosystems. Despite the universality of inter-annual variation in fruit production, few studies have addressed the sign (seed predation versus seed dispersal) and strength (frequency and quantity) of fruit-frugivore interaction and the effectiveness of endozoochory in response to...
Article
We reviewed case studies in female Japanese macaques engaged in social and spatial emigration. In such instances, animals leave their natal group and remain alone or in a small group, transfer to another group, or join extra-group males to establish a new group. Since 1953, at least 34 emigration cases (and at least 78 females) have been reported f...
Article
Full-text available
To examine multi-annual variations in the food habits of the Japanese marten (Martes melampus), we analyzed the composition of marten feces in the Bonbori Forest Path in western Tokyo, central Japan, in two time periods a decade apart (1997–1998 and 2007–2008). The staple foods of martens in both periods were fruits/seeds and animal materials (main...
Article
Using long-term behavioral data recorded between1950 and 2010, we studied cases of change in the alpha individual and its social background in a captive troop of Japanese macaques (Macaca fuscata) housed in Ueno Zoological Gardens, Tokyo, Japan. During this period, nine alpha males and four alpha females were recorded. Among the alpha males, three...
Article
A well-known behavioural model for group aggregation is that an individual depends on a few neighbouring individuals to adjust its movement, such as departure (repulsion) from and approach (attraction) to neighbours. However, an individual may rely not only on a few closest neighbours, but also on more distant individuals, in a group of stable memb...
Article
On October 31st, 2013, we unexpectedly observed attempted predation of two juvenile Javan lutungs (Trachypithecus auratus mauritius) by adult crested goshawks (Accipter trivirgatus), in Pangandaran Nature Reserve, West Java, Indonesia. The goshawks flew over a group of feeding lutungs, attempting attacks only on juvenile lutungs from the rear, whil...
Article
We analyzed regional variation in the diets of two primate clades, Asian macaques and colobines, whose distributions include temperate-alpine forests. We addressed feeding strategies that enabled them to adapt to harsh environments characterized by relatively low mean temperatures and strong seasonality in both temperature and food availability. Ma...
Article
Full-text available
Grey langurs (Semnopithecus spp.) occupy a variety of habitats, ranging from lowland forests and semi-desert to alpine forests. Little is known about their foraging and ranging in alpine forests, which appear to contain less food than lowland forests. We conducted a 1-year study of Himalayan grey langurs (Semnopithecus ajax) in Machiara National Pa...
Article
Full-text available
In order to understand the ecological adaptations of primates to survive in temperate forests, we need to know the general patterns of plant phenology in temperate and tropical forests. Comparative analyses have been employed to investigate general trends in the seasonality and abundance of fruit and young leaves in tropical and temperate forests....
Article
To understand the costs and benefits of group-living, it is important to clarify the impacts of other individuals on foraging success. Previous studies on group-living primates have focused on the relationship between feeding-group size and feeding rate in food patches, and have exhibited inconsistent results, showing positive, neutral, or negative...
Article
Full-text available
We studied the characteristics of seeds within feces, an important aspect of endozoochorous seed dispersal, in wild rhesus macaques (Macaca mulatta) inhabiting Son Tra Nature Reserve, central Vietnam. Fecal samples (n = 110) were collected from July to December 2011 (except November), and rate of seed occurrence, species/genus composition, rate of...
Article
Full-text available
We investigated the characteristics of a particular food-snatching behavior in which one individual forced another's mouth open and grabbed the food, as performed by free-ranging Japanese macaques (Macaca fuscata) in Choshikei Monkey Park on Shodoshima Island, western Japan. We conducted a survey in late June 2012 and observed one of two monkey tro...
Article
In this review I introduce the literature concerning variations in the feeding ecology of wild Japanese macaques (Macaca fuscata), for which many Japanese primatologists have collected data for more than 60 years. Specifically, I review 1) temporal, 2) spatial, and 3) inter-individual variations in the feeding ecology of the macaques. Food resource...
Article
In a series of field surveys of wild Javan lutungs (Trachypithecus auratus sondaicus) conducted at Pangandaran Nature Reserve in West Java, Indonesia, from 2011 to 2012, we tried to use a method of individual identification by using individual-specific patterns of dark pigmentation in the pubic area. During the 2011 dry season, we used a digital SL...
Article
We studied about the non-woody plant diets of wild Japanese macaques (Macaca fuscata), including herbaceous plants, ferns, mushrooms, seaweeds, and animal matter, in order to make clear how many numbers of non-woody plant food items were eaten by the macaques all over across Japan. This is useful information for both fundamental and applied studies...
Article
The importance of dominance status to foraging and ultimately survival or reproductive success in wild primates is known; however, few studies have addressed these variables simultaneously. We investigated foraging and social behavior among 17 adult female Japanese macaques (Macaca fuscata) on Kinkazan Island, northern Japan, from September to Nove...
Article
Full-text available
The spatial cohesiveness of a group is an important element that characterizes the social structure of group-living species. Moreover, remaining cohesive is crucial if individuals are to coordinate their activities and reach collective decisions. We measured interindividual spacing in a group of wild Japanese macaques (Macaca fuscata) to assess the...
Article
I investigated sleeping-site preference in habituated wild Japanese macaques (Macaca fuscata) for each season (254 days total) on predator-free Kinkazan Island, northern Japan, during 2000—2007. I focused on the effects of nonpredatory, environmental factors (vegetation type, altitude, and topography), to which little attention has been paid. Macaq...