Published Papers - Matsumoto Akiko

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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HEXACO, Dark Triad and altruism in daily life

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Pres Individ Differ   185   2021.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

Influence of rainfall on sleeping site choice by a group of anubis baboons (Papio anubis).

Suire A, Isbell LA, Bidner LR, Shinoda Y, Akasaka M, Matsumoto-Oda A

American journal of primatology ( American Journal of Primatology )  83 ( 1 ) e23223   2021.01 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Capture, immobilization, and Global Positioning System collaring of olive baboons (Papio anubis) and vervets (Chlorocebus pygerythrus): Lessons learned and suggested best practices.

Isbell LA, Bidner LR, Omondi G, Mutinda M, Matsumoto-Oda A

American journal of primatology ( American Journal of Primatology )  81 ( 6 ) e22997   2019.07 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Complete rectal prolapse in wild anubis baboons (Papio anubis).

Taniguchi H, Isbell LA, Bidner LR, Matsumoto-Oda A

Journal of medical primatology ( Journal of Medical Primatology )  48 ( 3 ) 179 - 181   2019.06 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Expression Changes of Structural Protein Genes May Be Related to Adaptive Skin Characteristics Specific to Humans.

Arakawa N, Utsumi D, Takahashi K, Matsumoto-Oda A, Nyachieo A, Chai D, Jillani N, Imai H, Satta Y, Terai Y

Genome biology and evolution ( Genome Biology and Evolution )  11 ( 3 ) 613 - 628   2019.03 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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The role of sleeping sites in the predator-prey dynamics of leopards and olive baboons.

Bidner LR, Matsumoto-Oda A, Isbell LA

American journal of primatology ( American Journal of Primatology )  80 ( 12 ) e22932   2018.12 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Group size effects on inter-blink interval as an indicator of antipredator vigilance in wild baboons.

Matsumoto-Oda A, Okamoto K, Takahashi K, Ohira H

Scientific reports ( Scientific Reports )  8 ( 1 ) 10062   2018.07 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Rearing the African Grass Blue Butterfly Zizeeria knysna: Toward the Establishment of a Bioindicator in African Countries

IWATA Masaki, MATSUMOTO-ODA Akiko, OTAKI Joji M.

African Study Monographs ( 京都大学アフリカ地域研究資料センター )  39 ( 2 ) 69 - 81   2018.06 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Urbanization and environmental pollution have increasingly become important issues in African countries. For environmental risk management, it is important to conduct field surveys for potential surrogate species and establish their ecotoxicological rearing experiments. A rearing system for the pale grass blue butterfly Zizeeria maha (Lepidoptera, Lycaenidae) has been successfully employed in Japan for the assessment of human-living environments, including rural and urban areas. A phylogenetically related species, the African grass blue butterfly Zizeeria knysna, lives in human residential environments widely in African countries. Thus, this species is potentially useful as a similar bioindicator in Africa. This paper reports the establishment of a simple and economical rearing system for Zizeeria knysna as well as some morphological traits of the immature and adult stages of this species. Females were obtained in central Kenya and confined in a meshed cage where eggs were readily obtained. Hatched larvae were reared on a natural host plant Oxalis corniculata. The failure rate of eclosion from pupae to adults was 6.5%, and the reared adult individuals showed normal color patterns, demonstrating the high efficiency of this rearing system. The rearing method for Zizeeria knysna in the present study may provide a basis for future human-living environmental assessments in Africa.

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GPS-identified vulnerabilities of savannah-woodland primates to leopard predation and their implications for early hominins.

Isbell LA, Bidner LR, Van Cleave EK, Matsumoto-Oda A, Crofoot MC

Journal of human evolution ( Journal of Human Evolution )  118   1 - 13   2018.05 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Rearing the African grass blue butterfly Zizeeria knysna (Lepidoptera: Lycaenidae) and its morphological comparison among the genus Zizeeria: Toward the establishment of a bioindicator in African countries.

Iwata M, Matsumoto-Oda A, Otaki J

Afr Stu Monogr   39   69 - 81   2018 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

Wound healing in wild male baboons: Estimating healing time from wound size.

Taniguchi H, Matsumoto-Oda A

PloS one ( PLoS ONE )  13 ( 10 ) e0205017   2018 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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GPS-identified, low-level nocturnal activity of vervets (Chlorocebus pygerythrus) and olive baboons (Papio anubis) in Laikipia, Kenya.

Isbell LA, Bidner LR, Crofoot MC, Matsumoto-Oda A, Farine DR

American journal of physical anthropology ( WILEY )  164 ( 1 ) 203 - 211   2017.09 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Objectives: Except for owl monkeys (Aotus spp.), all anthropoid primates are considered strictly diurnal. Recent studies leveraging new technologies have shown, however, that some diurnal anthropoids also engage in nocturnal activity. Here we examine the extent to which vervets (Chlor-ocebus pygerythrus) and olive baboons (Papio anubis) are active at night. Materials and Methods: We deployed GPS collars with tri-axial accelerometer data loggers on 18 free-ranging adult females: 12 vervets spread among 5 social groups, and 6 olive baboons spread among 4 groups. Their locations were recorded every 15 min, and their activity levels, for 3 s/min over 7.5 months. We also used camera traps that were triggered by heat and movement at seven sleeping sites. Results: Travel was detected on 0.4% of 2,029 vervet-nights involving 3 vervets and 1.1% of 1,109 baboon-nights involving 5 baboons. Travel was mainly arboreal for vervets but mainly terrestrial for baboons. During the night, vervets and baboons were active 13% and 15% of the time, respectively. Activity varied little throughout the night and appeared unaffected by moon phase. Discussion: Our results confirm the low nocturnality of vervets and olive baboons, which we suggest is related to living near the equator with consistent 12-hr days, in contrast to other anthropoids that are more active at night. Since anthropoid primates are thought to have evolved in northern latitudes, with later dispersal to tropical latitudes, our results may have implications for understanding the evolution of anthropoid diurnality.

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Testing socially mediated estrous synchrony or asynchrony in wild baboons

Yasuo Ihara, D. Anthony Collins, Ryo Oda, Akiko Matsumoto-Oda

BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY ( SPRINGER )  70 ( 11 ) 1921 - 1930   2016.11 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Females in some animal species have been suggested to synchronize or desynchronize their estrus cycles. This phenomenon may have a significant impact on the structure of animal societies because when there are more females simultaneously in estrus, even a dominant male is less able to defend them from other males. Previous attempts to detect non-random estrous cycles in primates have produced mixed results, and some of them have been criticized on the methodological grounds. We investigate whether wild female anubis baboons exhibit non-random estrous cycles using a larger dataset than previous studies. For a statistical analysis, we use a randomization procedure, taking a biasing effect of missing observations into consideration. Consistent with earlier studies on other species of baboons, our analysis does not find any evidence supporting estrous synchrony or asynchrony in anubis baboons.

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Two newly observed cases of fish-eating in anubis baboons.

Matsumoto-Oda A, Collins AD

LEBS   7   5 - 9   2016 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

How surviving baboons behaved after leopard predation: a case report

MATSUMOTO-ODA Akiko

Ａｎｔｈｒｏｐｏｌｏｇｉｃａｌ　Ｓｃｉｅｎｃｅ ( 日本人類学会 )  123 ( 1 ) 13 - 17   2015 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Predation has been an evolutionary force in primates, driving changes in their behavior, cognition, and numerous morphological characteristics. There is little evidence regarding the counter-strategies of primates to predation, because previous studies on primates have focused on the animals eaten rather than the animals that survive. I report a case of predation in which an adult male baboon was preyed on by a leopard in the early morning in the wild and describe how the surviving baboons behaved. Based on this report, I consider the counter-strategies of baboons to leopard predation, such as staying at the sleeping site, producing alarm calls, and shifting the sleeping site. Further information from other predation events is needed to understand the evolution of anti-predation behaviors.

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