Collective brains for spatiotemporal distributions of herons and egrets

• Project/Area Number: 26440233
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Ecology/Environment
• Research Institution: University of Tsukuba
• Principal Investigator: TOQUENAGA YUKIHIKO 筑波大学, 生命環境系, 准教授 (90237074)
• Research Collaborator: FASOLA Mauro Pavia大学, Zoology, 教授 ; MASHIKO Miyuki 野生動物保護管理事務所, 計画策定支援室, 研究員 ; CARRASCO Luis Centre for Ecology and Hydrology, Research Associate
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: Collective site fidelity / Random forest / Habitat selection / Long term data / Ardea cinerea / Bayesian / Evidentialist / Fisherian / site fidelity / collective philopatry / random forest / land use map / random walk / correlated random walk / habitat selection / long term data / Area cinerea / Fisheian

Outline of Final Research Achievements

We analyzed heronry dynamics around Ibaraki prefecture with random forest and correlated random walk. Increasing site fidelity was detected as a collective decision of colony members, and such decision was highly correlated with changes in species composition. We used the same technique for Dr. Fasola's data in northern Italy and found a similar tendency of increasing site fidelity. Our findings warn a previous interpretation that colony distributions were mainly determined by distributions of available foraging sites. More attention should be paid for historicity of colony formation.

Research Products

• [Int'l Joint Research] Universita Pavia(イタリア)
• [Journal Article] Balance between site fidelity and habitat preferences in colony site selection by herons and egrets (2017)
  • Author(s): Carrasco, L., Y. Toquenaga, and M. Mashiko
  • Journal Title: J. Avian Biol. Volume: in press Issue: 7 Pages: 965-975
  • DOI: 10.1111/jav.01255
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] 東アジアにおけるアマサギ2個体を対象とした長距離移動 衛星追跡 (2017)
  • Author(s): 藤田 剛, 土方直哉, 内田 聖, 平岡恵美子, 徳永幸彦,植田睦之, 高木憲太郎,時田賢一,樋口広芳
  • Journal Title: 日本鳥学会誌 Volume: in press
  • Peer Reviewed
• [Journal Article] How to walk on statistical mandalas as a population ecologist (2016)
  • Author(s): Toquenaga, Y.
  • Journal Title: Population Ecology Volume: 58 Issue: 1 Pages: 3-8
  • DOI: 10.1007/s10144-015-0532-z
  • NAID: 120007128514
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Extrapolation of random forest models shows scale adaptation in egret colony site selection against landscape complexity (2015)
  • Author(s): Carrasco, L., Y. Toquenaga, adn M. Mashiko
  • Journal Title: Ecological Complexity Volume: 24 Pages: 29-36
  • DOI: 10.1016/j.ecocom.2015.08.002
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Grey Heron (Ardea cinerea) expansion promotes the persistence of mixed-species heron colonies (2014)
  • Author(s): Mashiko, M. and Y. Toquenaga
  • Journal Title: Waterbirds Volume: 37 Issue: 4 Pages: 362-370
  • DOI: 10.1675/063.037.0403
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Application of random forest algorithm for studying habitat selection of colonial herons and egrets in human-influenced landscapes (2014)
  • Author(s): Carrasco, L., M. Mashiko, and Y. Toquenaga
  • Journal Title: Ecological Research Volume: 29 Issue: 3 Pages: 483-491
  • DOI: 10.1007/s11284-014-1147-0
  • NAID: 120007136702
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Collective colony formation algorithm (2016)
  • Author(s): Y. Toquenaga, Carrasco, L., M. Mashiko and M. Fasola
  • Organizer: Workshop on Herons of the World at Waterbird Society Meeting
  • Place of Presentation: New Bern, North Carolina, USA
  • Year and Date: 2016-09-20
  • Int'l Joint Research / Invited
• [Presentation] Ghost of an egret colony (2016)
  • Author(s): Mashiko, M. and Y. Toquenaga
  • Organizer: 第63回日本生態学会大会
  • Place of Presentation: 宮城県 仙台市 青葉区 青葉山 仙台国際センター
  • Year and Date: 2016-03-20
• [Presentation] Impact of climate change on waterbirds populations (2015)
  • Author(s): Toquenaga, Y.
  • Organizer: The impact of climate changes on animal populations
  • Place of Presentation: Erice, Sicily, Italy
  • Year and Date: 2015-11-09
  • Int'l Joint Research / Invited
• [Presentation] Collective memory of an abandoned egret colony (2015)
  • Author(s): Mashiko, M. and Y. Toquenaga
  • Organizer: 第31回個体群生態学会大会
  • Place of Presentation: 滋賀県 彦根市 八坂町 2500 滋賀県立大学
  • Year and Date: 2015-10-10
• [Presentation] Statistics and Population Ecology (2014)
  • Author(s): Toquenaga, Y. (Symposium Organizer)
  • Organizer: 第30回個体群生態学会
  • Place of Presentation: 筑波大学 ( 茨城県つくば市 )
  • Year and Date: 2014-10-11
• [Presentation] Rice, bugs, and egrets (2014)
  • Author(s): Toquenaga, Y. (Symposium Commentator)
  • Organizer: 第30回個体群生態学会
  • Place of Presentation: 筑波大学 ( 茨城県つくば市 )
  • Year and Date: 2014-10-11
• [Presentation] p03-008: Using Inexpensive satellite images and long-term census data to evaluate the evolution of habitat selection (2014)
  • Author(s): Carrasco L. and Y. Toquenaga
  • Organizer: 26th International Ornithological Congress
  • Place of Presentation: 立教大学 ( 東京都豊島区西池袋 )
  • Year and Date: 2014-08-18 – 2014-08-24
• [Presentation] p12-005: Reconstructing networks between winter roosts and summer colonies in Ardeidae species (2014)
  • Author(s): Toquenaga, Y. and M. Mashiko
  • Organizer: 26th International Ornithological Congress
  • Place of Presentation: 立教大学 ( 東京都豊島区西池袋 )
  • Year and Date: 2014-08-18 – 2014-08-24
• [Presentation] p12-006: Collective philopatry in heron colonies (2014)
  • Author(s): Mashiko, M. and Y. Toquenaga
  • Organizer: 26th International Ornithological Congress
  • Place of Presentation: 立教大学 ( 東京都豊島区西池袋 )
  • Year and Date: 2014-08-18 – 2014-08-24
• [Remarks] TOQUE's Page
  • URL: http://www.pe.ska.life.tsukuba.ac.jp/~toque/to9ue/