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FUKASAWA, KeitaPh.D., Senior ResearcherBiodiversity Assessment and Projection Section Biodiversity Division, National Institute for Environmental Studies Onogawa 16-2, Tsukuba City, Ibaraki 305-8506, Japan |
Research Overview
Large-scale ecosystem management such as eradication of invasive alien species and wildlife damage control is an increasing issue. If a management action is planned properly, it can be considered as a large-scale field manipulation experiment. Then, we will be able to obtain not only understandings about dynamics of the organisms but also decision-support information for the management. My research theme is connecting data and decision-making in ecosystem management using ecological models. My specific interests are management of invasive alien tree species in the Bonin Islands, eradication of the small Asian mongoose in Amami Island, and population management of the bear.
Research Interests
Spatio-temporal ecology, Conservation biology, Hierarchical Bayes model
Original Papers (peer reviewed)
Fukasawa K., Higashide D. (2025) Mechanistic home range capture-recapture models for the estimation of population density and landscape connectivity. Ecology, 106 (2), e70046 
updated Feb. 27, 2025
Ogawa, Y., Fukasawa, K., Yoshioka, A., Kumada, N., Takenaka, A., & Kamijo, T. (2025) Optimizing the frequency of question items for bird species in quiz-style online training. Ecological Informatics, Volume 85. DOI:10.1016/j.ecoinf.2024.102908 updated Jan. 15, 2025
Aoki, S., Fukasawa K. S. (2024) Kernel density estimation of allele frequency including undetected alleles. PeerJ 12:e17248. DOI: 10.7717/peerj.17248 updated Apl. 26, 2024
Aoki, S., Ishihama F., Fukasawa K. (2023) Robustness of genetic diversity measures under spatial sampling and a new frequency-independent measure. PeerJ, 11:e16027. DOI: 10.7717/peerj.16027 updated Sep. 22, 2023
Ogawa, Y., Fukasawa, K., Yoshioka, A., Kumada, N., Takenaka, A., Ito, T. (2023). Quiz-style online training tool helps to learn birdsong identification and support citizen science. PeerJ, 11:e15387. updated Jun. 27
Shimozuru, M., Jimbo, M., Adachi, K., Kawamura, K., Shirane, Y., Umemura, Y., Ishinazaka, T., Nakanishi, M., Kiyonari, M., Yamanaka, M., Amagai, Y., Ijuin, A., Sakiyama, T., Kasai, S., Nose, T., Shirayanagi, M., Tsuruga, H., Mano, T., Tsubota, T. Fukasawa, K., Uno, H. (2022). Estimation of breeding population size using DNA-based pedigree reconstruction in brown bears. Ecology and Evolution, 12, e9246. updated Oct. 13, 2022
Kasada, M., Nakashima,Y., Fukasawa, K., Yajima, G., Yokomizo, H., Miyashita, T. (2022) State-space model combininglocal camera data and regional administration datareveals population dynamics of wild boar. Population Ecology, DOI:10.1002/1438-390X.12138KASADAET AL.13 updated Sep. 2, 2022
Sugimoto N., Fukasawa, K., Asahara A., Kasada M., Matsuba M., Miyashita T. (2022) Positive and negative effects of land abandonment on butterfly communities revealed by a hierarchical sampling design across climatic regions. Proceedings of the Royal Society B, 289, 1971
Higashide, D., Kuriyama, T., Takagi, S., Nakashima, Y., Fukasawa, K., Yajima, G., Kasada, M., Yokoyama, M. (2021) Effectiveness of signs of activity as relative abundance indices for wild boar. Wildlife Biology, doi: 10.2981/wlb.00869
Hata, A., Nakashita, R., Fukasawa, K., Minami, M., Fukue, Y., Higuchi, N., Uno, H., Nakajima, Y., Saeki, M., Kozakai, C., Takada, M. B. (2021) Occurrence patterns of crop-foraging sika deer distribution in an agriculture-forest landscape revealed by nitrogen stable isotopes. Ecology and Evolution, 11, 15303-15311.
Matsuhashi S., Asai M., Fukasawa K. (2021) Estimations and projections of Avena fatua dynamics under multiple management scenarios in crop fields using simplified longitudinal monitoring. PLoS ONE, 16, e0245217
Fukasawa K., Osada Y., Iijima H. (2020) Is harvest size a valid indirect measure of abundance for evaluating the population size of game animals using harvest-based estimation? Wildlife Biology
Nishimoto M., Miyashita T., Yokomizo H., Matsuda H., Imazu T., Takahashi H., Hasegawa M., Fukasawa K. (2020) Spatial optimization of invasive species control informed by management practices. Ecological Applications, 31, e02261
Yoshioka A., Shimizu A., Oguma H., Kumada N., Fukasawa K., Jingu S., Kadoya T. (2020) Development of a camera trap for perching dragonflies: a new tool for freshwater environmental assessment. PeerJ, 8, e9681. DOI: 10.7717/peerj.9681
Yoshioka A., Matsushima N., Jingu S., Kumada N., Yokota R., Totsu K., Fukasawa K. (2020) Acoustic monitoring data of anuran species inside and outside the evacuation zone of the Fukushima Daiichi power plant accident. Ecological Research, 35, 765-772. DOI: 10.1111/1440-1703.12121
Komine, H., Fukasawa, K., Akasaka, M., Watari, Y., Iwai, N., Kaji, K. (2020) Rapid behavioural responses of native frogs caused by past predation pressure from invasive mongooses. Journal of Zoology, 310(2), 126-134. DOI: 10.1111/jzo.12734
Fujita T., Ariga T., Hijioka Y., Fukasawa K., Ohashi H. (2019) Assessing the potential impacts of climate and population change on land-use changes projected to 2100 in Japan. Climate Research, 79, 139-149
Fukasawa, K., Akasaka, T. (2019) Long-lasting effects of historical land use on the current distribution of mammals revealed by ecological and archaeological patterns. Scientific Reports, 9, 10697. DOI: 10.1038/s41598-019-46809-1 
Ohashi, H., Fukasawa, K., Ariga, T., Matsui, T., Hijioka, Y. (2019)
High-resolution national land use scenarios under a shrinking population
in Japan. Transactions in GIS, 23, 786-804. DOI: 10.1111/tgis.12525
Nakashima, Y., Fukasawa, K., Samejima, H. (2018) Estimating animal density without individual recognition
using information derivable exclusively from camera traps. Journal of Applied
Ecology, 55(2), 735-744. DOI: 10.1111/1365-2664.13059
Yoshioka, A., Fukasawa, K., Mishima, Y., Sasaki, K., Kadoya, T. (2017). Ecological dissimilarity among land-use/land-cover types improves a heterogeneity index for predicting biodiversity in agricultural landscapes. Ambio, 46(8), 894-906. DOI: 10.1007/s13280-017-0925-7
Hata, A., Takada, MB., Nakashita, R., Fukasawa, K., Oshida, T., Ishibashi, Y., Sato, Y. (2017) Stable isotope and DNA analyses reveal the spatial distribution of crop-foraging brown bears. Journal of Zoology, 303(3), 207-217. DOI: 10.1111/jzo.12479
Mizuta T., Takami Y., Torikai H., Watanabe T., Fukasawa K. (2017) Song-count
surveys and population estimates reveal the recovery of the endangered
Amami Thrush Zoothera dauma major, which is endemic to Amami-Oshima Island
in south-western Japan. Bird Conservation International, 27(4), 470-482. DOI: 10.1017/S095927091600023X
Fukasawa, K., Mishima, Y., Yoshioka, A., Kumada, N., Totsu, K. (2017) Acoustic monitoring
data of avian species inside and outside the evacuation zone of the Fukushima
Daiichi power plant accident. Ecological Research, 32(6), 769. DOI: 10.1007/s11284-017-1491-y
Yoshioka, A., Fukasawa, K., Mishima, Y., Sasaki, K., Kadoya, T. (2017) Ecological dissimilarity among
land-use/land-cover types improves a heterogeneity index for predicting
biodiversity in agricultural landscapes. Ambio, 46(8), 894-906. DOI: 10.1007/s13280-017-0925-7
Fukasawa, K., Mishima, Y., Yoshioka, A., Kumada, N., Totsu, K., Osawa, T. (2016) Mammal
assemblages recorded by camera traps inside and outside the evacuation
zone of the Fukushima Daiichi Nuclear Power Plant accident. Ecological
Research, 31(4), 493. DOI: 10.1007/s11284-016-1383-6
Tani, N., Tsumura, Y., Fukasawa, K., Kado, T., Taguchi, Y., Lee, SL, et al. (2015) Mixed Mating System Are
Regulated by Fecundity in Shorea curtisii (Dipterocarpaceae) as Revealed
by Comparison under Different Pollen Limited Conditions. PLoS ONE, 10(5),
e0123445. DOI: 10.1371/journal.pone.0123445
Yoshioka, A., Mishima, Y., Fukasawa, K. (2015) Pollinators and other flying
insects inside and outside the Fukushima evacuation zone. PLOS ONE, 10(e0140957),
1-16. DOI: 10.1371/journal.pone.0140957
Fukasawa, K., Hashimoto, T., Tatara, M., Abe, S. (2013) Reconstruction
and prediction of invasive mongoose population dynamics from history of
introduction and management: a Bayesian state-space modelling approach.
Journal of Applied Ecology, 50(2), 469-478. DOI: 10.1111/1365-2664.12058
Fukasawa, K., Miyashita, T., Hashimoto, T., Tatara, M., and Abe, S. (2013) Differential population responses of native and alien rodents to an invasive predator, habitat alteration, and plant masting. Proceedings of Royal Society B: Biological Sciences, 280, 20132075. DOI: 10.1098/rspb.2013.2075
Tani, N., Tsumura, Y., Fukasawa, K., Kado, T., Taguchi, Y., Lee, S.L.,
Lee, C.T., Muhammad, N., Niiyama, K., Otani, T., Yagihashi, T., Ripin,A.,
Kassim, A. R. (2012) Male fecundity and pollen dispersal in hill dipterocarps:
significance of mass synchronized flowering and implications for conservation.
Journal of Ecology, 100(2), 405-415. DOI: 10.1111/j.1365-2745.2011.01929.x
Fukasawa, K., Koike, F., Tanaka, N. and Otsu, K. (2009) Predicting future invasion of an invasive alien tree in a Japanese oceanic island by process-based statistical models using recent distribution maps. Ecological Research, 24, 965-975. DOI: 10.1007/s11284-009-0595-4
Books/ Book Sections
Last updated Feb. 27, 2025