Details of a Researcher - Matsumoto Akiko

Matsumoto Akiko

写真a

Title	Professor
Researcher Number(JSPS Kakenhi)	80369206

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Current Affiliation Organization 【 display / non-display 】

Duty University of the Ryukyus Faculty of Global and Regional Studies tourism and community design program Professor
Concurrently University of the Ryukyus Graduate School of Tourism Sciences
Concurrently University of the Ryukyus Graduate School of Engineering and Science

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Academic degree 【 display / non-display 】

Kyoto University - Dr.

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External Career 【 display / non-display 】

2010.04

　

　

- , University of the Ryukyus, Faculty of Tourism Sciences and Industrial Management, Department of Tourism Sciences, Professor
2010.04

　

　

University of the Ryukyus, Faculty of Tourism Sciences and Industrial Management, Department of Tourism Sciences, Professor

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Research Interests 【 display / non-display 】

biological anthoropology
primatology
social behavior

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Research Areas 【 display / non-display 】

Life Science / Physical anthropology
Life Science / Animal physiological chemistry, physiology and behavioral biology
Humanities & Social Sciences / Tourism studies
Others / Others

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Published Papers 【 display / non-display 】

How to treat mixed behavior segments in supervised machine learning of behavioral modes from inertial measurement data

Resheff Y, Bensch H M, Zottl M, Harel R, Matsumoto-Oda A, Crofoot M, Gomez S, Börger L, Rotics S

Moving Ecology 12 ( 44 ) 2024.06 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The application of supervised machine learning methods to identify behavioural modes from inertial measurements of bio-loggers has become a standard tool in behavioural ecology. Several design choices can affect the accuracy of identifying the behavioural modes. One such choice is the inclusion or exclusion of segments consisting of more than a single behaviour (mixed segments) in the machine learning model training data. Currently, the common practice is to ignore such segments during model training. In this paper we tested the hypothesis that including mixed segments in model training will improve accuracy, as the model would perform better in identifying them in the test data. We test this hypothesis using a series of data simulations on four datasets of accelerometer data coupled with behaviour observations, obtained from four study species (Damaraland mole-rats, meerkats, olive baboons, polar bears). Results show that when a substantial proportion of the test data are mixed behaviour segments (above ~ 10%), including mixed segments in machine learning model training improves the accuracy of classification. These results were consistent across the four study species, and robust to changes in segment length, sample size, and degree of mixture within the mixed segments. However, we also find that in some cases (particularly in baboons) models trained with mixed segments show reduced accuracy in classifying test data containing only single behaviour (pure) segments, compared to models trained without mixed segments. Based on these results, we recommend that when the classification model is expected to deal with a substantial proportion of mixed behaviour segments (> 10%), it is beneficial to include them in model training, otherwise, it is unnecessary but also not harmful. The exception is when there is a basis to assume that the training data contains a higher rate of mixed segments than the actual (unobserved) data to be classified—such a situation may occur particularly when training data are collected in captivity and used to classify data from the wild. In this case, excess inclusion of mixed segments in training data should probably be avoided.
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Reduction of bitter taste receptor gene family in folivorous Colobines as compared with omnivorous Cercopithecines in Primates

Hou M, Akhtar MS, Hayashi M, Ashino, Matsumoto-Oda A, Hayakawa T, Ishida T, Melin AD, Imai H, Kawamura S

Primates 65 311 - 331 2024 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Bitter taste perception is important in preventing animals from ingesting potentially toxic compounds. Whole-genome assembly (WGA) data have revealed that bitter taste receptor genes (TAS2Rs) comprise a multigene family with dozens of intact and disrupted genes in primates. However, publicly available WGA data are often incomplete, especially for multigene families. In this study, we employed a targeted capture (TC) approach specifically probing TAS2Rs for ten species of cercopithecid primates with diverse diets, including eight omnivorous cercopithecine species and two folivorous colobine species. We designed RNA probes for all TAS2Rs that we modeled to be intact in the common ancestor of cercopithecids (“ancestral-cercopithecid TAS2R gene set”). The TC was followed by short-read and high-depth massive-parallel sequencing. TC retrieved more intact TAS2R genes than found in WGA databases. We confirmed a large number of gene “births” at the common ancestor of cercopithecids and found that the colobine common ancestor and the cercopithecine common ancestor had contrasting trajectories: four gene “deaths” and three gene births, respectively. The number of intact TAS2R genes was markedly reduced in colobines (25–28 detected via TC and 20–26 detected via WGA analysis) as compared with cercopithecines (27–36 via TC and 19–30 via WGA). Birth or death events occurred at almost every phylogenetic-tree branch, making the composition of intact genes variable among species. These results show that evolutionary change in intact TAS2R genes is a complex process, refute a simple general prediction that herbivory favors more TAS2R genes, and have implications for understanding dietary adaptations and the evolution of detoxification abilities.
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Estimating individual exposure to predation risk in group-living baboons, Papio anubis.

Suire A, Kunita I, Harel R, Crofoot M, Mutinda M, Kamau M, Hassel JM, Murray S, Kawamura S, Matsumoto-Oda A

PloS one ( Public Library of Science (PLoS) ) 18 ( 11 ) e0287357 - e0287357 2023 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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In environments with multiple predators, vulnerabilities associated with the spatial positions of group-living prey are non-uniform and depend on the hunting styles of the predators. Theoretically, coursing predators follow their prey over long distances and attack open areas, exposing individuals at the edge of the group to predation risk more than those at the center (marginal predation). In contrast, ambush predators lurk unnoticed by their prey and appear randomly anywhere in the group; therefore, isolated individuals in the group would be more vulnerable to predators. These positions of vulnerability to predation are expected to be taken by larger-bodied males. Moreover, dominant males presumably occupy the center of the safe group. However, identifying individuals at higher predation risk requires both simultaneous recording of predator location and direct observation of predation events; empirical observations leave ambiguity as to who is at risk. Instead, several theoretical methods (predation risk proxies) have been proposed to assess predation risk: (1) the size of the individual ‘unlimited domain of danger’ based on Voronoi tessellation, (2) the size of the ‘limited domain of danger’ based on predator detection distance, (3) peripheral/center position in the group (minimum convex polygon), (4) the number and direction of others in the vicinity (surroundedness), and (5) dyadic distances. We explored the age-sex distribution of individuals in at-risk positions within a wild baboon group facing predation risk from leopards, lions, and hyenas, using Global Positioning System collars. Our analysis of the location data from 26 baboons revealed that adult males were consistently isolated at the edge of the group in all predation risk proxies. Empirical evidence from previous studies indicates that adult male baboons are the most frequently preyed upon, and our results highlights the importance of spatial positioning in this.
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BATHING BEHAVIOUR IN SPOTTED HYENAS (CROCUTA CROCUTA) IN LAIKIPIA, KENYA: TWO OBSERVATIONAL CASES

Akiko Matsumoto-Oda

Journal of East African Natural History 110 ( 2 ) 87 - 92 2022.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
Point of Care Blood Gas and Electrolyte Analysis in Anesthetized Olive Baboons (Papio anubis) in a Field Setting

Maureen W. Kamau, James M. Hassell, Ellie L. Milnes, Lee-Ann C. Hayek, Mathew M. Mutinda, Roi Harel, Akiko Matsumoto-Oda, Jennifer H. Yu, Dawn Zimmerman, Margaret Crofoot, Suzan Murray

International Journal of Primatology ( Springer Science and Business Media LLC ) 42 ( 5 ) 667 - 681 2021.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Books 【 display / non-display 】

Behavioral Diversity in Chimpanzees and Bonobos

Matsumoto-Oda A ( Part: Allotment Writing , Social relationships between cycling females and males in Mahale chimpanzees. )

Cambridge University Press. p168-180 2002
All Apes Great and Small: Volume 1: African Apes

Hosaka K, Nishida T, Hamai M, Matsumoto-Oda A, Uehara S ( Part: Allotment Writing , Predation of mammals by the chimpanzees of the Mahale Mountasins, Tanzania. )

Kluwer Academic Publishers. p107-130 2001
Baboons: Behavior, Ecology and Taxonomy

Matsumoto-Oda A, Van Rooy A, Palombit RA. ( Part: Allotment Writing , Shared use of sleeping sites and avoidance of daytime encounters in two neighboring baboon groups. )

Cambridge University Press. 1900.01