Latitudinal pattern of methanotrophic food webs driving carbon and nitrogen cycling in lakes

• Project/Area Number: 16H05774
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Ecology/Environment
• Research Institution: Research Institute for Humanity and Nature
• Principal Investigator: Okuda Noboru 総合地球環境学研究所, 研究部, 准教授 (30380281)
• Co-Investigator(Kenkyū-buntansha): 伊藤 雅之 兵庫県立大学, 環境人間学部, 准教授 (70456820) ; 藤林 恵 秋田県立大学, 生物資源科学部, 助教 (70552397)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2018: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2016: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
• Keywords: メタン栄養食物網 / メタン酸化細菌 / メタン動態 / NC10 / 窒素補給 / 一回循環湖 / 部分循環湖 / 緯度間変異 / メタン / 炭素・窒素循環 / 酸化還元環境 / メチル栄養細菌 / 熱帯部分循環湖

Outline of Final Research Achievements

Comparative study was conducted in three lakes, temperate Lake Biwa in Japan, subtropical Fei-Tsui Reservoir (FTR) in Taiwan and tropical Seven Lakes in the Philippines, to understand ecosystem responses, especially of CH4 dynamics, methane oxidizing bacteria (MOB) communities and methanotrophic food webs, to climate changes across latitudinal gradient. The FTR alternated between monomictic and meromictic lakes when winter was cold and warm, respectively. During stratification period following the warm winter, CH4 storage developed and anaerobic MOB dominated in profundal waters. Vertical profiles of methane concentrations and MOB communities in the Seven Lakes were similar to those of FTR in warm years, while the Lake Biwa resembled the FTR in cold years. However, there was no marked latitudinal variation in methanotrophic food webs in relation to their reliance on methane production, suggesting that lakes in lower latitude have the higher potential for atmospheric CH4 emission.

Academic Significance and Societal Importance of the Research Achievements

従来、熱帯湖沼は周年成層が発達する部分循環湖とみなされていたが、本研究により、熱帯湖沼もモンスーンの影響で循環すること、また、全循環の有無は深度依存的であることを明らかにした。季節風や台風などの物理攪乱時に大気放出されるメタンフラックスを定量的に評価するために、高時間解像度観測とメタン生成・消費のプロセス研究が今後の課題として挙げられた。我が国では、温暖化に伴う湖沼の循環不全と底層の貧酸素化が懸念されており、琵琶湖では、全循環が停止する異常事態も発生している。本研究による熱帯・亜熱帯湖沼の知見は、将来的に予想される温帯湖沼の熱帯化が生態系および社会に及ぼすインパクトを予測する上で有用である。

Research Products

• [Int'l Joint Research] サント・トーマス大学(フィリピン)
• [Int'l Joint Research] 中央研究院/国立臺灣大学(台湾)
• [Int'l Joint Research] 中央研究院/国立臺灣大学(台湾)
• [Int'l Joint Research] サント・トーマス大学(フィリピン)
• [Int'l Joint Research] 中央研究院/国立臺灣大学(台湾)
• [Int'l Joint Research] サント・トーマス大学(フィリピン)
• [Journal Article] Nutrient loadings and deforestation decrease benthic macroinvertebrate diversity in an urbanised tropical stream system (2020)
  • Author(s): Peralta Elfritzson M., Batucan Leocris S., De Jesus Irisse Bianca B., Trino Ellis Mika C., Uehara Yoshitoshi, Ishida Takuya, Kobayashi Yuki, Ko Chia-Ying, Iwata Tomoya, Borja Adelina S., Briones Jonathan Carlo A., Papa Rey Donne S., Magbanua Francis S., Okuda Noboru
  • Journal Title: Limnologica Volume: 80 Pages: 125744-125744
  • DOI: 10.1016/j.limno.2019.125744
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Small Maar Lakes of Luzon Island, Philippines: Their Limnological Status and Implications for the Management of Tropical Lakes . A Review (2019)
  • Author(s): Mendoza, M. U., Briones, J. C. A., Itoh, M., Padilla, K. S. A. R., Aguilar, J. I., Okuda, N., Papa, R. D. S.
  • Journal Title: Philippine Journal of Science Volume: 148 Pages: 559-572
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Stream benthic macroinvertebrate assemblages reveal the importance of a recently established freshwater protected area in a tropical watershed (2019)
  • Author(s): Peralta, E. M., A. E. Belen, G. R. Buenaventura, F. G. G. Cantre, K. G. R. Espiritu, J. N. A. De Vera, C. P. Perez, A. K. V. Tan, I. B. B. De Jesus, P. Palomares, J. C. A. Briones, T. Ikeya, F. S. Magbanua, R. D. S. Papa, N. Okuda
  • Journal Title: Pacific Science Volume: 73 Pages: 305-320
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The biogeochemical cycling of methane (CH4) in lakes Calibato, Pandin and Yambo: Implications on the lakes’ carrying capacity (2019)
  • Author(s): Mendoza, M. U., J. I. Aguilar, K. S. A. R. Padilla, M. Itoh, N. Okuda, R. D. S. Papa
  • Journal Title: Transactions of the National Academy of Science & Technology Philippines Volume: 41 Pages: 139-139
  • Int'l Joint Research
• [Journal Article] Disentangling multiple stressors and highlighting the importance of freshwater protected area in highly urbanized watersheds in the Philippines (2019)
  • Author(s): Peralta E., F. S. Magbanua, J. C. A. Briones, N. Okuda, R. D. S. Papa
  • Journal Title: Transactions of the National Academy of Science & Technology Philippines Volume: 41 Pages: 146-146
  • Int'l Joint Research
• [Journal Article] Assessing alpha and beta diversities of benthic macroinvertebrates and their environmental drivers between watersheds with different levels of habitat transformation in Japan (2019)
  • Author(s): Ko Chia-Ying、Iwata Tomoya、Lee Jun-Yi、Murakami Aya、Okano Junichi、Ishikawa Naoto F.、Sakai Yoichiro、Tayasu Ichiro、Itoh Masayuki、Song Uhram、Togashi Hiroyuki、Nakano Shinich、Ohte Nobuhito、Okuda Noboru
  • Journal Title: Marine and Freshwater Research Volume: 70 Issue: 4 Pages: 504-504
  • DOI: 10.1071/mf18031
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Partitioning Eddy-Covariance Methane Fluxes from a Shallow Lake into Diffusive and Ebullitive Fluxes (2018)
  • Author(s): Iwata Hiroki、Hirata Ryuichi、Takahashi Yoshiyuki、Miyabara Yuichi、Itoh Masayuki、Iizuka Kotaro
  • Journal Title: Boundary-Layer Meteorology Volume: 169 Issue: 3 Pages: 413-428
  • DOI: 10.1007/s10546-018-0383-1
  • Peer Reviewed
• [Journal Article] Ecosystem-scale methane flux in tropical peat swamp forest in Indonesia (2018)
  • Author(s): Sakabe Ayaka、Itoh Masayuki、Hirano Takashi、Kusin Kitso
  • Journal Title: Global Change Biology Volume: 24 Issue: 11 Pages: 5123-5136
  • DOI: 10.1111/gcb.14410
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Integrating isotopic, microbial, and modeling approaches to understand methane dynamics in a frequently disturbed deep reservoir in Taiwan (2017)
  • Author(s): Itoh Masayuki、Kojima Hisaya、Ho Pei-Chi、Chang Chun-Wei、Chen Tzong-Yueh、Hsiao Silver Sung-Yun、Kobayashi Yuki、Fujibayashi Megumu、Kao Shuh-Ji、Hsieh Chih-hao、Fukui Manabu、Okuda Noboru、Miki Takeshi、Shiah Fuh-Kwo
  • Journal Title: Ecological Research Volume: 32 Issue: 6 Pages: 861-871
  • DOI: 10.1007/s11284-017-1502-z
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Food web properties of the recently constructed, deep subtropical Fei-Tsui Reservoir in comparison with the ancient Lake Biwa (2017)
  • Author(s): Okuda, N., Y. Sakai, K. Fukumori, S.-M. Yang, C. Hsieh, F.-K. Shiah
  • Journal Title: Hydrobiologia Volume: 802 Issue: 1 Pages: 199-210
  • DOI: 10.1007/s10750-017-3258-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Integrated trophic position decreases in more diverse communities of stream food webs (2017)
  • Author(s): Ishikawa Naoto F.、Chikaraishi Yoshito、Ohkouchi Naohiko、Murakami Aya R.、Tayasu Ichiro、Togashi Hiroyuki、Okano Jun-ichi、Sakai Yoichiro、Iwata Tomoya、Kondoh Michio、Okuda Noboru
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 2130-2130
  • DOI: 10.1038/s41598-017-02155-8
  • NAID: 120006364078
  • Peer Reviewed / Open Access
• [Journal Article] Prevailing environmental conditions influence mollusk diversity and distribution around Talim Island of Laguna de Bay (Luzon Is., Philippines) (2017)
  • Author(s): Peralta, E. M., H. J. A. Guerrero, C. G. S. M. Arce, J. J. A. Domingo, M. A. Maute, M. D. S. San Miguel, E. M. C. Trino, I. B. B. De Jesus, J. C. A. Briones, F. S. Magbanua, N. Okuda, R. D. S. Papa
  • Journal Title: The Antoninus Journal Volume: 1 Pages: 31-39
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 微気象学的手法と生物地球化学的手法を統合した浅い中緯度湖からのメタン放出の評価 (2017)
  • Author(s): 岩田拓記，平田竜一，高橋善幸，伊藤雅之，宮原裕一，飯塚浩太郎，小林大曙，佐藤媛香，中澤琴美，常田岳志
  • Journal Title: 関東の農業気象 Volume: 43 Pages: 9-12
  • Peer Reviewed
• [Journal Article] Summer profundal hypoxia determines the coupling of methanotrophic production and the pelagic food web in a subtropical reservoir (2016)
  • Author(s): Ho, P.-C., N. Okuda, T. Miki, M. Itoh, F.-K. Shiah, C.-W. Chang, S. S.-Y. Hsiao, S.-J. Kao, M. Fujibayashi & C.-H. Hsieh
  • Journal Title: Freshwater Biology Volume: 61 Issue: 10 Pages: 1694-1706
  • DOI: 10.1111/fwb.12809
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Abundance of planktonic methane-oxidizing bacteria in a subtropical reservoir (2016)
  • Author(s): Kobayashi, Y., H. Kojima, M. Itoh, N. Okuda, M. Fukui, F.-K. Shiah
  • Journal Title: Plankton & Benthos Research Volume: 11 Pages: 144-146
  • NAID: 130005285135
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Impacts of riparian wetlands on the seasonal variations of watershed-scale methane budget in a temperate monsoonal forest (2016)
  • Author(s): A. Sakabe, Y. Kosugi, C. Okumi, M. Itoh, and K. Takahashi
  • Journal Title: J. Geophys. Res. Biogeosciences Volume: 121 Issue: 7 Pages: 1717-1732
  • DOI: 10.1002/2015jg003292
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evaluation of surface water quality using multicariate statistical techniques: a case study of Fet-Tsui Reservoir basin, Taiwan (2016)
  • Author(s): Chow, M. F., Shiah F. K., Lai, C. C., Kuo, H. Y., Wang, K. W., Lin, C. H., Chen, T. Y., Kobayashi, Y., Ko, C. Y.
  • Journal Title: Environmental Earth Sciences Volume: 75 Issue: 1 Pages: 1-15
  • DOI: 10.1007/s12665-015-4922-5
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 湖からの拡散による温室効果ガスの放出のモデル検証 (2020)
  • Author(s): 田岡作, 岩田拓記, 宮原裕一, 平田竜一, 高橋善幸, 伊藤雅之
  • Organizer: 日本農業気象学会
• [Presentation] Methanotrophic food webs in tropical lakes (2020)
  • Author(s): Okuda, N., M. U. Mendoza, J. I. Aguilar, K. S. A. R. Padilla, J. C. A. Briones, R. D. S. Papa, M. Ito, M. Fujibayashi, T.-H. Tu, L.-H. Lin, P.-L. Wang, Y. Kobayashi, E. Austria & F.-K. Shiah
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Simulation of methane dynamics in a mid-latitude eutrophic lake with constraints using incubation data (2019)
  • Author(s): Iwata, H., Nakano, W., Stepanenko, V., Kobayashi, D., Taoka, T., Itoh, M., Miyabara, Y., Hirata, R., Takahashi, Y.
  • Organizer: AsiaFlux
  • Int'l Joint Research
• [Presentation] Methanotrophic food webs in tropical lakes: a preliminary report (2019)
  • Author(s): Okuda, N., Milette, M., Aguilar, J., Padilla, K., Briones, J., Papa, R., Itoh, M.., Fujibayashi, M., Tu, T-H., Lin, L-H., Wang, P-L., Kobayashi, Y., Austria, E., Shiah, F-K.
  • Organizer: 日本陸水学会
• [Presentation] Watershed governance: a case in the Lake Biwa Watershed (2019)
  • Author(s): Okuda, N
  • Organizer: RIHN International Symposium: Fair use of multiple resources in cross-scale context
  • Int'l Joint Research / Invited
• [Presentation] Vertical profiles of methane-oxidizing bacteria in selected tropical maar lakes of San Pablo, Laguna, Philippines (2019)
  • Author(s): Padilla KSAR, Mendoza MU, Aguilar JI, Austria ES, Lin LH, Tu TH, Shiah FK, Papa RDS, Okuda N
  • Organizer: Graduate Scholars’ Conference
• [Presentation] Exploring methane (CH4) storage in small tropical lakes (2019)
  • Author(s): Mendoza MU, Aguilar JI, Padilla KSAR, Itoh M, Okuda N, Papa RDS
  • Organizer: Graduate Scholars’ Conference
• [Presentation] Long-term limnological monitoring revealed the spatio-temporal patterns of the Seven Maar Lakes (SML’s) of Laguna (2019)
  • Author(s): Aguilar JI, Mendoza MU, Padilla KSAR, Papa RDS, Okuda N
  • Organizer: Graduate Scholars’ Conference
• [Presentation] Multiple stressors and protection efforts in highly urbanized watersheds in the Philippines (2019)
  • Author(s): Peralta, E. M., L. S. Batucan Jr., A. E. Belen, I. B. B. De Jesus, T. Ishida, C.-Y. Ko, Y. Kobayashi, T. Ikeya, Y. Uehara, T. Iwata, A. S. Borja, J. C. A. Briones, F. S. Magbanua, R. D. S. Papa, N. Okuda
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Benthic macroinvertebrate assemblages and water quality reflect the impacts of land use and land cover in Marikina Watershed, Philippines (2019)
  • Author(s): Gregorio, J. A. N., E. M. Peralta, I. B. B. De Jesus, T. Ikeya, J. C. A. Briones, R. D. S. Papa, F. S. Magbanua, N. Okuda
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] 琵琶湖の流域と地域の問題を解決する取り組み (2019)
  • Author(s): 奥田昇
  • Organizer: 八郎潟・八郎湖学研究会
  • Invited
• [Presentation] Carbon and nitrogen stable isotopes reveal impacts of human activities on community assemblages and food web structures in Laguna de Bay and Marikina Watershed (2018)
  • Author(s): Peralta EM, Magbanua FS, Briones JCA, Okuda N, Papa RDS
  • Organizer: Philippine Symposium on Freshwater Biodiversity and Ecosystems
  • Int'l Joint Research
• [Presentation] Vertical distribution of methane-oxidizing bacteria in tropical Maar Lakes Yambo, Pandin, and Calibato in San Pablo, Laguna (2018)
  • Author(s): Padilla KSAR, Aguilar JI, Mendoza MU, Okuda N, Papa RDS
  • Organizer: Philippine Symposium on Freshwater Biodiversity and Ecosystems
  • Int'l Joint Research
• [Presentation] What has changed in the Twin Lakes of San Pablo, Laguna, Philippines (2008 vs 2018)? (2018)
  • Author(s): Mendoza MU, Tordesillas DT, Padilla KSAR, Aguilar JI, Okuda N, Papa RDS
  • Organizer: Philippine Symposium on Freshwater Biodiversity and Ecosystems
  • Int'l Joint Research
• [Presentation] The adaptive watershed governance: science for society (2018)
  • Author(s): Okuda, N.
  • Organizer: Philippine Symposium on Freshwater Biodiversity and Ecosystems
  • Int'l Joint Research / Invited
• [Presentation] Stream benthic macroinvertebrate assemblages reflect anthropogenic impacts and protection status of in the two watersheds of Laguna de Bay, Philippines (2018)
  • Author(s): Peralta, E. M., F. S. Magbanua, J. C. A. Briones, N. Okuda, R. D. S. Papa
  • Organizer: Annual Convention of the Federation of Institutions for Marine and Freshwater Sciences (FIMFS)
• [Presentation] Monsoon-driven variations in the vertical profile of the Seven Maar Lakes of San Pablo, Laguna: Diving deeper in the limnology of tropical maar lakes (2018)
  • Author(s): Aguilar, J. F., P. Cootauco, J. A. T. DE Guzman, P. A. Mauricio, C. Remperas, N. Okuda, R. D. S. Papa R
  • Organizer: Annual Convention of the Federation of Institutions for Marine and Freshwater Sciences (FIMFS)
• [Presentation] What can we learn from determining methane concentrations in freshwater lake ecosystems? (2018)
  • Author(s): Mendoza, M. U., K. S. R. Padilla, J. Aguilar, M. Itoh, N. Okuda, R. D. S. Papa
  • Organizer: Annual Convention of the Federation of Institutions for Marine and Freshwater Sciences (FIMFS)
• [Presentation] Watershed governance to enhance social-ecological health (2018)
  • Author(s): Okuda, N.
  • Organizer: World Lake Conference
  • Int'l Joint Research / Invited
• [Presentation] The adaptive watershed governance: linking local and global scales (2018)
  • Author(s): Okuda, N.
  • Organizer: International Symposium of Future Earth
  • Int'l Joint Research / Invited
• [Presentation] Littoral food web analysis: Stable isotopes reveal anthropogenic impacts on Oreochromis niloticus and its food sources in Laguna de Bay (2018)
  • Author(s): Peralta, E. M., C. B. Bacinillo, J. C. A. Balani, S. E. Basmala, E. J. S. S. Calalin, M. A. G. Calleja, J. B. C. Go, M. T. S. Gosiengfiao, F. A. T. Valdecanas, J. N. Gregorio, N. Mendoza, T. Ishida, F. S. Magbanua, J. C. A. Briones, R. D. S. Papa, N. Okuda
  • Organizer: Fisheries Science Conference
• [Presentation] Are the ‘Twin Lakes’of San Pablo ‘identical’? (2018)
  • Author(s): Aguilar, J. F., K. S. A. Padilla, M. U. Mendoza, N. Okuda, R. D. S. Papa
  • Organizer: Congress of International Society of Limnology
  • Int'l Joint Research
• [Presentation] Monsoon-based variations in the vertical profile of selected limnological parameters in in the Seven Maar Lakes (SML’s) of Laguna (Luzon Is., Philippines): A unique insight into the limnology of tropical maar lakes (2018)
  • Author(s): Papa R. D. S., J. F. I. Aguilar, P. A. B. Cootauco, J. A. P. De Guzman, P. A. C. Mauricio, C. T. A. Remperas, N. Okuda
  • Organizer: Congress of International Society of Limnology
  • Int'l Joint Research
• [Presentation] Zooplankton Community Structure in the Littoral Zones of Laguna de Bay reflects Land Cover and Nutrient Loading in near-shore areas (2018)
  • Author(s): Guinto, M. M. V., H. A. Guerrero, J. C. A. Briones, R. D. S. Papa, N. Okuda
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] Stable Isotopes Reveal Anthropogenic Impacts on the Littoral Food Webs of Laguna de Bay, Philippines (2018)
  • Author(s): Peralta, E. M., C. Bacinillo, J. C. Balani, S. Basmala, E. J. S. Calalin, M. A. Calleja, J. B. Go, M. T. Gosiengfiao, F. A. Valdecanas, J.-A. Gregorio, N. Mendoza, T. Ishida, F. Magbanua, J. C. Briones, R. D. Papa, N. Okuda
  • Organizer: JpGU-AGU Joint Meeting
  • Int'l Joint Research
• [Presentation] フィリピン・ラグナ湖流域の栄養循環：琵琶湖流域との比較 (2018)
  • Author(s): 奥田昇, Irisse Bianca De Jesus, Osbert Leo A. Privaldos, 岩田智也, 上原佳敏, 石田卓也, 淺野悟史, 尾坂健一, 藤吉麗, 由水千景, 陀安一郎, Jonathan Carlo A. Briones, Francis S. Magbanua, Maria Pythias B. Espino, Adelina C. Santos-Borja, Rey Donne S. Papa
  • Organizer: 水文科学会学術大会
  • Invited
• [Presentation] 琵琶湖流域の栄養循環：統合的理解を目指して (2018)
  • Author(s): 奥田昇, 小野寺真一, 伴修平
  • Organizer: 日本陸水学会
• [Presentation] 渦相関法により測定された浅い湖からのメタン放出の拡散とバブル放出への分離 (2018)
  • Author(s): 岩田拓記，平田竜一，高橋善幸，宮原裕一，伊藤雅之，飯塚浩太郎
  • Organizer: 日本農業気象学会
• [Presentation] 諏訪湖における湖水中のメタン動態 (2018)
  • Author(s): 佐藤媛香，岩田拓記，伊藤雅之，宮原裕一，中澤琴美
  • Organizer: 日本農業気象学会
• [Presentation] Monsoon-driven variations in the vertical profile of the Seven Maar Lakes of San Pablo, Laguna: Diving deeper in the limnology of tropical maar lakes (2018)
  • Author(s): Aguilar JF, Cootauco P, DE Guzman JAT, Mauricio PA, Remperas C, Okuda N, Papa RDS.
  • Organizer: Federation of Institutions for Marine and Freshwater Sciences (FIMFS)
• [Presentation] What can we learn from determining methane concentrations in freshwater lake ecosystems? (2018)
  • Author(s): Mendoza MU, Padilla KSA, Aguilar JF, Itoh M, Okuda N, Papa RDS.
  • Organizer: Federation of Institutions for Marine and Freshwater Sciences (FIMFS)
• [Presentation] Then & now: What has changed in the Twin Lakes of San Pablo, Laguna, Philippines (2008 vs 2018)? (2018)
  • Author(s): Mendoza MU, Tordesillas DT, Padilla KSA, Aguilar JI, Okuda N, & Papa RDS.
  • Organizer: Philippine Symposium on Freshwater Biodiversity and Ecosystems
• [Presentation] Vertical distribution of methane-oxidizing bacteria in tropical Maar Lakes Yambo, Pandin, and Calibato in San Pablo, Laguna (2018)
  • Author(s): Padilla KSA, Aguilar JI, Mendoza MU, Okuda N, & Papa RDS.
  • Organizer: Philippine Symposium on Freshwater Biodiversity and Ecosystems
• [Presentation] Monsoon-based variations in the vertical profile of selected limnological parameters in in the Seven Maar Lakes (SML’s) of Laguna (Luzon Is., Philippines): A unique insight into the limnology of tropical maar lakes (2018)
  • Author(s): Papa RDS, Aguilar JFI, Cootauco PAB, De Guzman JAP, Mauricio PAC, Remperas CTA, Okuda N.
  • Organizer: Congress of International Society of Limnology
  • Int'l Joint Research
• [Presentation] Are the ‘Twin Lakes’of San Pablo ‘identical’? (2018)
  • Author(s): Aguilar, J. F., K. S. A. Padilla, M. U. Mendoza, N. Okuda & R. D. S. Papa
  • Organizer: Congress of International Society of Limnology
  • Int'l Joint Research
• [Presentation] Evaluation of methane emission from a mid-latitude lake with the eddy covariance technique (2017)
  • Author(s): Iwata, H., Hirata, R., Takahashi, Y., Itoh, M., Iizuka, K., Miyabara, Y., Kobayashi, D., Tokida, T.
  • Organizer: Physical Processes in Natural Waters
  • Int'l Joint Research
• [Presentation] Evaluation of methane emission from a mid-latitude lake with the eddy covariance technique (2017)
  • Author(s): Iwata, H., Hirata, R., Takahashi, Y., Itoh, M., Iizuka, K., Nakazawa, K., Satoh, H., Kobayashi, D., Tokida, T.
  • Organizer: AsiaFlux Workshop
  • Int'l Joint Research
• [Presentation] Toward the adaptive watershed governance to enhance biodiversity-driven nutrient cycling and human well-being (2016)
  • Author(s): Okuda, N.
  • Organizer: The 16th World Lake Conference
  • Place of Presentation: バリ（インドネシア）
  • Year and Date: 2016-11-07
• [Presentation] Biodiversity Assessment of Littoral Macrozoobenthos in Laguna de Bay, Philippines (2016)
  • Author(s): Trino, E. M. C., I. B. B De Jesus, E. M. Peralta, H. J. A. Guerrero, C. G. S. M. Arce, J. J. A. Domingo, M. A. Maute, M. D. S. San Miguel, J. C. A. Briones, F. S. Magbanua, A. C. Santos-Borja, R. D. S. Papa & N. Okuda
  • Organizer: The 16th World Lake Conference
  • Place of Presentation: バリ（インドネシア）
  • Year and Date: 2016-11-07
• [Presentation] A pioneer in tropical streams: determination of phosphorous and nitrogen uptake in Silang-Santa Rosa watershed, Philippines (2016)
  • Author(s): De Jesus, I. B., O. L. A. Privaldos, A. S. Borja, F. S. Magbanua, R. D. S. Papa, T. Iwata & N. Okuda
  • Organizer: 48th Annual National Convention of the Federation of Institutions for Marine and Freshwater Sciences
  • Place of Presentation: イースタン・フィリピン大学、カタルマン
  • Year and Date: 2016-09-21
• [Presentation] Benthic macroinvertebrates assemblages and biological metrics in relation to land cover and environmental factors in Silang-Santa Rosa subwatershed, Philippines (2016)
  • Author(s): Peralta, E., Batucan L. S. Jr., Briones, J. C. A, F. S. Magbanua, R. D. S. Papa, Magbanua F. S. & N. Okuda
  • Organizer: 48th Annual National Convention of the Federation of Institutions for Marine and Freshwater Sciences
  • Place of Presentation: イースタン・フィリピン大学、カタルマン市
  • Year and Date: 2016-09-21
• [Presentation] Methanotrophic food webs as a carbon recycling system in lakes under climate changes (2016)
  • Author(s): Okuda, N.
  • Organizer: The 1st Philippine Symposium on Freshwater Biodiversity and Ecosystems
  • Place of Presentation: サントトーマス大学、マニラ
  • Year and Date: 2016-06-07
  • Invited
• [Funded Workshop] nternational Workshop: Latitudinal pattern of methanotrophic food webs in lakes (2018)
• [Funded Workshop] Latitudinal pattern of methanotrophic food webs in lakes (2018)
• [Funded Workshop] Workshop on methanotrophic food webs (2016)
  • Place of Presentation: 中央研究院、台北市
  • Year and Date: 2016-09-18