日本地球惑星科学連合2016年大会

講演情報

インターナショナルセッション(口頭発表)

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS03] Marine ecosystem and biogeochemical cycles: theory, observation and modeling

2016年5月23日(月) 10:45 〜 12:10 202 (2F)

コンビーナ:*伊藤 進一(東京大学大気海洋研究所)、平田 貴文(北海道大学地球環境科学研究院)、Hofmann Eileen E.(Old Dominion University)、Charles Stock(Geophysical Fluid Dynamics Laboratory)、座長:平田 貴文(北海道大学地球環境科学研究院)、Stock Charles(Geophysical Fluid Dynamics Laboratory)

11:20 〜 11:40

[AOS03-09] A new perspective on the foraging ecology of apex predators in the California Current: results from a fully coupled ecosystem model.

★招待講演

*Jerome Fiechter1Luis Huckstadt1Kenneth Rose2Daniel Costa1Enrique Curchitser3Katherine Hedstrom4Christopher Edwards1 (1.Univ. California Santa Cruz、2.Louisiana State Univ.、3.Rutgers Univ.、4.Univ. Alaska Fairbanks)

キーワード:Ecosystem model, Foraging ecology, California Current, Marine predators

Results from a fully coupled ecosystem model for the California Current Large Marine Ecosystem are used to describe the impact of environmental variability on the foraging ecology of its most abundant apex predator, California sea lions. The ecosystem model consists of a biogeochemical submodel embedded in a regional ocean circulation submodel, and both coupled with a multi-species individual-based submodel for forage fish (sardine and anchovy) and California sea lions. Sardine and anchovy are specifically included in the model as they represent important prey sources for California sea lions and exhibit significant interannual and decadal variability in population abundances. Output from a 20-year run (1989-2008) of the model demonstrates how different physical and biological processes control habitat utilization and foraging success of California sea lions on interannual time scales, with the dominant modes of variability linked to sardine abundance and coastal upwelling intensity. The results also illustrate how variability in environmental conditions, forage fish distribution, and prey assemblage affect sea lions feeding success. While specifically focusing on the foraging ecology of sea lions, the modeling framework has the ability to provide new and unique perspectives on trophic interactions in the California Current, or other regions where similar end-to-end ecosystem models may be implemented.