<strong>Equilibrium Solutions for Marine Food-chain to Bottom-up and Top-down Controls</strong>

Yutaka Isoda

Presentation information

[JJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS31] [JJ] Linkage between oceanography and paleoceanography in marginal, shelf and coastal oceans

Sat. May 20, 2017 1:45 PM - 3:15 PM 303 (International Conference Hall 3F)

convener:Atsuhiko Isobe(Research Institute for Applied Mechanics, Kyushu University), Michinobu Kuwae(Center for Marine Environmental Studies), Shinichiro Kida(Research Institute for Applied Mechanics, Kyushu University), Chairperson:Atsuhiko Isobe(Research Institute for Applied Mechanics, Kyushu University), Chairperson:Michinobu Kuwae(Center for Marine Environmental Studies)

1:45 PM - 2:00 PM

[AOS31-01] Equilibrium Solutions for Marine Food-chain to Bottom-up and Top-down Controls

*Yutaka Isoda¹ (1.Hokkaido University)

Keywords:Bottom-up control, Top-down control, Marine food-chain, Volteraa equation

Using a simple four-level food-chain model (N: nutrient, P: phytoplankton, Z: zooplankton and F: fish), the equilibrium solutions are investigated under the nutrient supply (bottom-up control) and the loss-parameter of fish (top-down control). The solutions of bottom-up control suggest that Z stock is always stabilized, while those of top-down control reveal the phase relation between [N, Z] and [P, F] is out of phase.