2026
Nakashima, Naohisa; Fukuda, Shinji; Matsubara, Hinata; Ogawa, Kosei; Koshiyama, Naoko
Multi-taxon environmental DNA analysis reveals distributions and pathways of Pelophylax nigromaculatus invasion in Iwamizawa, Hokkaido, Japan Journal Article
In: Hydrobiologia, vol. 853, no. 7, pp. 2075–2091, 2026, ISSN: 1573-5117.
@article{Nakashima2025b,
title = {Multi-taxon environmental DNA analysis reveals distributions and pathways of Pelophylax nigromaculatus invasion in Iwamizawa, Hokkaido, Japan},
author = {Naohisa Nakashima and Shinji Fukuda and Hinata Matsubara and Kosei Ogawa and Naoko Koshiyama},
doi = {10.1007/s10750-025-06053-3},
issn = {1573-5117},
year = {2026},
date = {2026-04-00},
journal = {Hydrobiologia},
volume = {853},
number = {7},
pages = {2075--2091},
publisher = {Springer Science and Business Media LLC},
abstract = {Abstract
This study explores the recent expansion of the translocated invasive Black-spotted pond frog
Pelophylax nigromaculatus
in Iwamizawa, Hokkaido, Japan, focusing on dispersal routes and habitat uses at landscape and field scales. Environmental DNA (eDNA) surveys across rivers and agricultural canals confirmed the occurrence of
P. nigromaculatus
in Iwamizawa for the first time, and revealed that
P. nigromaculatus
primarily dispersed via agricultural canals connected to paddy fields rather than larger natural rivers. Smaller canals facilitated species movement, whereas rivers posed potential barriers. Detailed eDNA analysis and visual observations in two adjacent paddy lots—one with an open-ditch system and the other without—demonstrated that frogs likely entered from the irrigation canals. The open-ditch lot supported a population due to continuous inundation even during midseason drainage, whereas reduced water levels in the conventional paddy lot restricted long-term microhabitat use. In contrast to the invasive species, the native Japanese tree frog
Dryophytes japonicus
was not detected by eDNA in the open-ditch lot, reflecting a habitat segregation of the species. These findings support the important role of agricultural canal networks and connectivity between rivers, canals, and paddy fields in driving amphibian invasions, offering critical insights into the conservation and control of invasive species.
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study explores the recent expansion of the translocated invasive Black-spotted pond frog
in Iwamizawa, Hokkaido, Japan, focusing on dispersal routes and habitat uses at landscape and field scales. Environmental DNA (eDNA) surveys across rivers and agricultural canals confirmed the occurrence of
in Iwamizawa for the first time, and revealed that
primarily dispersed via agricultural canals connected to paddy fields rather than larger natural rivers. Smaller canals facilitated species movement, whereas rivers posed potential barriers. Detailed eDNA analysis and visual observations in two adjacent paddy lots—one with an open-ditch system and the other without—demonstrated that frogs likely entered from the irrigation canals. The open-ditch lot supported a population due to continuous inundation even during midseason drainage, whereas reduced water levels in the conventional paddy lot restricted long-term microhabitat use. In contrast to the invasive species, the native Japanese tree frog
was not detected by eDNA in the open-ditch lot, reflecting a habitat segregation of the species. These findings support the important role of agricultural canal networks and connectivity between rivers, canals, and paddy fields in driving amphibian invasions, offering critical insights into the conservation and control of invasive species.
Fu, Junjie; Kato, Tomomichi; Morozumi, Tomoki; Matsumoto, Kazuho; Taniguchi, Shingo; Ueyama, Masahito; Buareal, Kanokrat; Miyauchi, Tatsuya; Nakashima, Naohisa; Akitsu, Tomoko Kawaguchi
The efficiency-level inconsistency of the SIF–GPP relationship in a subtropical evergreen forest in Okinawa, Japan Journal Article
In: Agricultural and Forest Meteorology, vol. 379, 2026, ISSN: 0168-1923.
@article{Fu2026,
title = {The efficiency-level inconsistency of the SIF–GPP relationship in a subtropical evergreen forest in Okinawa, Japan},
author = {Junjie Fu and Tomomichi Kato and Tomoki Morozumi and Kazuho Matsumoto and Shingo Taniguchi and Masahito Ueyama and Kanokrat Buareal and Tatsuya Miyauchi and Naohisa Nakashima and Tomoko Kawaguchi Akitsu},
doi = {10.1016/j.agrformet.2026.111050},
issn = {0168-1923},
year = {2026},
date = {2026-03-00},
journal = {Agricultural and Forest Meteorology},
volume = {379},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ogawa, Kosei; Moriyama, Takumi; Nakashima, Naohisa; Kato, Tomomichi; Fukuda, Shinji
Historical data to recover the distribution of freshwater fishes across 1950s Japan Journal Article
In: Biological Conservation, vol. 313, 2026, ISSN: 0006-3207.
@article{Ogawa2026,
title = {Historical data to recover the distribution of freshwater fishes across 1950s Japan},
author = {Kosei Ogawa and Takumi Moriyama and Naohisa Nakashima and Tomomichi Kato and Shinji Fukuda},
doi = {10.1016/j.biocon.2025.111644},
issn = {0006-3207},
year = {2026},
date = {2026-01-00},
journal = {Biological Conservation},
volume = {313},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2025
Nakashima, Naohisa; Kawamura, Kensuke; Hirata, Masahiro; Muneoka, Toshimi; Kimura, Masato; Shinkai, Moeka
Effects of Nocturnal Grazing Behavior and Stock Density on Cattle Dung in Sloped Rotational Grazing Journal Article
In: Rangeland Ecology & Management, vol. 99, pp. 18–25, 2025, ISSN: 1550-7424.
@article{Nakashima2025c,
title = {Effects of Nocturnal Grazing Behavior and Stock Density on Cattle Dung in Sloped Rotational Grazing},
author = {Naohisa Nakashima and Kensuke Kawamura and Masahiro Hirata and Toshimi Muneoka and Masato Kimura and Moeka Shinkai},
doi = {10.1016/j.rama.2024.11.006},
issn = {1550-7424},
year = {2025},
date = {2025-03-00},
journal = {Rangeland Ecology & Management},
volume = {99},
pages = {18--25},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
MUNEOKA, Toshimi; NAITO, Ayano; YAMAZAKI, Yuri; KOBAYASHI, Takeshi; NAGAI, Akira; NAKASHIMA, Naohisa; KIMURA, Masato
Shear characteristics on soil specimen containing roots of exotic herbaceous plants using sodding method and influence of slope direction. Journal Article
In: J.Jpn.Soc.Reveget.Tech., vol. 51, no. 1, pp. 7–12, 2025, ISSN: 1884-3670.
@article{MUNEOKA2025,
title = {Shear characteristics on soil specimen containing roots of exotic herbaceous plants using sodding method and influence of slope direction.},
author = {Toshimi MUNEOKA and Ayano NAITO and Yuri YAMAZAKI and Takeshi KOBAYASHI and Akira NAGAI and Naohisa NAKASHIMA and Masato KIMURA},
doi = {10.7211/jjsrt.51.7},
issn = {1884-3670},
year = {2025},
date = {2025-00-00},
journal = {J.Jpn.Soc.Reveget.Tech.},
volume = {51},
number = {1},
pages = {7--12},
publisher = {The Japanese Society of Revegetation Technology},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2024
Buareal, Kanokrat; Kato, Tomomichi; Morozumi, Tomoki; Nakashima, Naohisa; Tanatarakeree, Kitpanuwat; Ueyama, Masahito; Hirano, Takashi
In: JGR Biogeosciences, vol. 129, no. 7, 2024, ISSN: 2169-8961.
@article{Buareal2024,
title = {Solar‐Induced Chlorophyll Fluorescence as a Potential Proxy for Gross Primary Production and Methane Emission in a Cool‐Temperate Bog in Northern Japan},
author = {Kanokrat Buareal and Tomomichi Kato and Tomoki Morozumi and Naohisa Nakashima and Kitpanuwat Tanatarakeree and Masahito Ueyama and Takashi Hirano},
doi = {10.1029/2023jg007956},
issn = {2169-8961},
year = {2024},
date = {2024-07-00},
journal = {JGR Biogeosciences},
volume = {129},
number = {7},
publisher = {American Geophysical Union (AGU)},
abstract = {Abstract Wetlands play an essential role in the global greenhouse gas budget via carbon dioxide sequestration as well as methane emission. In recent decades, solar‐induced chlorophyll fluorescence (SIF) has been recognized as a remotely sensed proxy of gross primary productivity (GPP), which generates substrates for methane production. To examine the suitability of SIF for estimation of these two fluxes, we conducted ground tower‐based SIF observation with an ultrafine‐resolution spectroradiometer in conjunction with eddy covariance measurement in a cool‐temperate bog. The daily SIF retrieved in the red (687 nm) and far‐red (760 nm) bands (SIFred and SIFfar‐red , respectively) increased nonlinearly with GPP and linearly with absorbed photosynthetically active radiation (APAR). The relatively weak correlation between apparent SIF yield (ΦSIF = SIF/APAR) and light use efficiency implied that both APAR and plant physiology constrained the SIF emission in this wetland. The SIFred /SIFfar‐red ratio showed a significant negative relationship with vegetation greenness indices, and the similar seasonal variation in SIFred and SIFfar‐red indicated that the SIFred reabsorption effect only weakly influenced the SIFred –GPP relationship. Episodic temporal reduction in the water table did not distinctly influence SIF and ΦSIF. Estimation of the methane emission rate was subtly improved by incorporating SIF, which was substituted for GPP as the methanogenesis substrate, in a multivariable regression analysis together with two environmental factors: soil temperature and water table depth. This study illustrates the potential of both SIFred and SIFfar‐red to monitor GPP and to predict methane emission in wetlands. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nakashima, Naohisa; Tsuji, Osamu; Muneoka, Toshimi; Kimura, Masato
A data‐based approach to determining the optimal water ponding scale and zone for small urban wetland restoration Journal Article
In: Restoration Ecology, vol. 32, no. 5, 2024, ISSN: 1526-100X.
@article{Nakashima2024,
title = {A data‐based approach to determining the optimal water ponding scale and zone for small urban wetland restoration},
author = {Naohisa Nakashima and Osamu Tsuji and Toshimi Muneoka and Masato Kimura},
doi = {10.1111/rec.14154},
issn = {1526-100X},
year = {2024},
date = {2024-07-00},
journal = {Restoration Ecology},
volume = {32},
number = {5},
publisher = {Wiley},
abstract = {This study established a planning framework for effective small‐scale urban wetland restoration by adapting an analytical template used for watershed‐scale projects. We evaluated the optimal water ponding scale and location for small urban wetland restoration. We calculated the achievable water ponding area in Oyama Wetland, Hokkaido, Japan, by the use of an artificial water supply and elevation differences without reliance on precipitation. The volume of infiltration into the sediments, a component of the water balance equation, was estimated during a temporary suspension of the artificial water supply, and the estimate was then validated by modeling the decrease of the water ponding area from 2008, before the introduction of the artificial water supply, with high reproducibility (Nash–Sutcliffe efficiency = 0.68). The estimated attainable water ponding area was 1172 m2 . We identified where a water ponding location could be most efficiently established through principal component and cluster analyses of groundwater level observation data collected from 2008 to 2010. Areas with high groundwater levels (first axis) and stable groundwater levels (second axis) accounted for approximately 73% of the cumulative contribution ratio. The calculated potentially achievable ponding area was consistent with the area achieved by the actual wetland restoration. This study shows how efficient and safe restoration of urban wetlands can be achieved with a dataset that volunteers and others can obtain independently. Long‐term data analysis using the adapted template allows for clear identification of discrepancies between desired reference conditions and current conditions, facilitating the setting of objectives that promote long‐term monitoring. },
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2023
Morozumi, Tomoki; Kato, Tomomichi; Kobayashi, Hideki; Sakai, Yuma; Tsujimoto, Katsuto; Nakashima, Naohisa; Buareal, Kanokrat; Lan, Wu; Ninomiya, Hideki
In: Agricultural and Forest Meteorology, vol. 339, 2023, ISSN: 0168-1923.
@article{Morozumi2023,
title = {Row orientation influences the diurnal cycle of solar-induced chlorophyll fluorescence emission from wheat canopy, as demonstrated by radiative transfer modeling},
author = {Tomoki Morozumi and Tomomichi Kato and Hideki Kobayashi and Yuma Sakai and Katsuto Tsujimoto and Naohisa Nakashima and Kanokrat Buareal and Wu Lan and Hideki Ninomiya},
doi = {10.1016/j.agrformet.2023.109576},
issn = {0168-1923},
year = {2023},
date = {2023-08-00},
journal = {Agricultural and Forest Meteorology},
volume = {339},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Buareal, Kanokrat; Kato, Tomomichi; Morozumi, Tomoki; Ono, Keisuke; Nakashima, Naohisa
Red solar-induced chlorophyll fluorescence as a robust proxy for ecosystem-level photosynthesis in a rice field Journal Article
In: Agricultural and Forest Meteorology, vol. 336, 2023, ISSN: 0168-1923.
@article{Buareal2023,
title = {Red solar-induced chlorophyll fluorescence as a robust proxy for ecosystem-level photosynthesis in a rice field},
author = {Kanokrat Buareal and Tomomichi Kato and Tomoki Morozumi and Keisuke Ono and Naohisa Nakashima},
doi = {10.1016/j.agrformet.2023.109473},
issn = {0168-1923},
year = {2023},
date = {2023-06-00},
journal = {Agricultural and Forest Meteorology},
volume = {336},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
守山拓弥 茂木万理菜, 中島直久
トウキョウダルマガエルの越冬場の選択性 ― 複数地区及び同一圃場内における越冬環境の比較 ― Journal Article
In: 農業農村工学会論文集, vol. 91, iss. 1, pp. I_1-I_10, 2023, ISSN: 1884-7242.
@article{nokey,
title = {トウキョウダルマガエルの越冬場の選択性 ― 複数地区及び同一圃場内における越冬環境の比較 ―},
author = {茂木万理菜, 守山拓弥, 中島直久},
doi = {10.11408/jsidre.91.i_1},
issn = {1884-7242},
year = {2023},
date = {2023-01-05},
journal = {農業農村工学会論文集},
volume = {91},
issue = {1},
pages = {I_1-I_10},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Morozumi, Tomoki; Kato, Tomomichi; Kobayashi, Hideki; Sakai, Yuma; Nakashima, Naohisa; Buareal, Kanokrat; Nasahara, Kenlo Nishida; Akitsu, Tomoko Kawaguchi; Murayama, Shohei; Noda, Hibiki M.; Muraoka, Hiroyuki
In: Remote Sensing of Environment, vol. 284, 2023, ISSN: 0034-4257.
@article{Morozumi2023b,
title = {Contributions of the understory and midstory to total canopy solar-induced chlorophyll fluorescence in a ground-based study in conjunction with seasonal gross primary productivity in a cool-temperate deciduous broadleaf forest},
author = {Tomoki Morozumi and Tomomichi Kato and Hideki Kobayashi and Yuma Sakai and Naohisa Nakashima and Kanokrat Buareal and Kenlo Nishida Nasahara and Tomoko Kawaguchi Akitsu and Shohei Murayama and Hibiki M. Noda and Hiroyuki Muraoka},
doi = {10.1016/j.rse.2022.113340},
issn = {0034-4257},
year = {2023},
date = {2023-01-00},
journal = {Remote Sensing of Environment},
volume = {284},
publisher = {Elsevier BV},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2021
守山拓弥 茂木万理菜, 中島直久
水田の水管理がトウキョウダルマガエルの再生産にあたえる影響 Journal Article
In: 農業農村工学会論文集, vol. 89, iss. 2, pp. I_353-I_362, 2021, ISBN: 1884-7242.
@article{nokey,
title = {水田の水管理がトウキョウダルマガエルの再生産にあたえる影響},
author = {茂木万理菜, 守山拓弥, 中島直久},
doi = {10.11408/jsidre.89.I_353},
isbn = {1884-7242},
year = {2021},
date = {2021-11-09},
journal = {農業農村工学会論文集},
volume = {89},
issue = {2},
pages = {I_353-I_362},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nakashima, Naohisa; Kato, Tomomichi; Morozumi, Tomoki; Tsujimoto, Katsuto; Akitsu, Tomoko Kawaguchi; Nasahara, Kenlo Nishida; Murayama, Shohei; Muraoka, Hiroyuki; Noda, Hibiki M.
In: J Plant Res, vol. 134, no. 4, pp. 713–728, 2021, ISSN: 1618-0860.
@article{Nakashima2021,
title = {Area-ratio Fraunhofer line depth (aFLD) method approach to estimate solar-induced chlorophyll fluorescence in low spectral resolution spectra in a cool-temperate deciduous broadleaf forest},
author = {Naohisa Nakashima and Tomomichi Kato and Tomoki Morozumi and Katsuto Tsujimoto and Tomoko Kawaguchi Akitsu and Kenlo Nishida Nasahara and Shohei Murayama and Hiroyuki Muraoka and Hibiki M. Noda},
doi = {10.1007/s10265-021-01322-3},
issn = {1618-0860},
year = {2021},
date = {2021-07-00},
journal = {J Plant Res},
volume = {134},
number = {4},
pages = {713--728},
publisher = {Springer Science and Business Media LLC},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nakashima, Naohisa; Moriyama, Takumi; Motegi, Marina; Mori, Akira; Watabe, Keiji
Underground behavior of overwintering Tokyo daruma pond frogs in early spring Journal Article
In: Paddy Water Environ, vol. 19, no. 1, pp. 127–135, 2021, ISSN: 1611-2504.
@article{Nakashima2020,
title = {Underground behavior of overwintering Tokyo daruma pond frogs in early spring},
author = {Naohisa Nakashima and Takumi Moriyama and Marina Motegi and Akira Mori and Keiji Watabe},
doi = {10.1007/s10333-020-00824-5},
issn = {1611-2504},
year = {2021},
date = {2021-01-00},
journal = {Paddy Water Environ},
volume = {19},
number = {1},
pages = {127--135},
publisher = {Springer Science and Business Media LLC},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2020
NODA, Kotaro; NAKASHIMA, Naohisa; MORIYAMA, Takumi; MORI, Akira; WATABE, Keiji; TAMURA, Takahiro
Development of methods to detect hibernation sites of Tokyo Daruma pond frog （Pelophylax porosus porosus）using the PIT Tag system. Journal Article
In: ECE, vol. 22, no. 2, pp. 165–173, 2020, ISSN: 1882-5974.
@article{NODA2020,
title = {Development of methods to detect hibernation sites of Tokyo Daruma pond frog （\textit{Pelophylax porosus porosus}）using the PIT Tag system.},
author = {Kotaro NODA and Naohisa NAKASHIMA and Takumi MORIYAMA and Akira MORI and Keiji WATABE and Takahiro TAMURA},
doi = {10.3825/ece.22.165},
issn = {1882-5974},
year = {2020},
date = {2020-00-00},
journal = {ECE},
volume = {22},
number = {2},
pages = {165--173},
publisher = {Ecology and Civil Engineering Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2018
Nakashima, Naohisa; Noda, Kotaro; Moriyama, Takumi; Mori, Akira; Watabe, Keiji; Tamura, Takahiro
A case study of the conditions for crawling out by Tokyo daruma pond frogs hibernating in the cultivated fields Journal Article
In: Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, vol. 86, iss. 2, pp. 225-234, 2018, (Japanese).
@article{nokey,
title = {A case study of the conditions for crawling out by Tokyo daruma pond frogs hibernating in the cultivated fields},
author = {Nakashima, Naohisa and Noda, Kotaro and Moriyama, Takumi and Mori, Akira and Watabe, Keiji and Tamura, Takahiro},
doi = {https://doi.org/10.11408/jsidre.86.I_225},
year = {2018},
date = {2018-11-01},
urldate = {2018-11-01},
journal = {Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering},
volume = {86},
issue = {2},
pages = {225-234},
note = {Japanese},
keywords = {},
pubstate = {published},
tppubtype = {article}
}