Editorial: Ecological complex systems
ABSTRACT Main aim of this topical issue is to report recent advances in noisy nonequilibrium processes useful to describe the dynamics
of ecological systems and to address the mechanisms of spatio-temporal pattern formation in ecology both from the experimental
and theoretical points of view. This is in order to understand the dynamical behaviour of ecological complex systems through
the interplay between nonlinearity, noise, random and periodic environmental interactions. Discovering the microscopic rules
and the local interactions which lead to the emergence of specific global patterns or global dynamical behaviour and the noise’s
role in the nonlinear dynamics is an important, key aspect to understand and then to model ecological complex systems.
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ABSTRACT: Phytoplankton patchiness ubiquitously obser-ved in marine ecosystems is a simple phy-sical phenomenon. Only two factors are required for its formation: one is persistent variations of inhomogeneous distributions in the phytopl-ankton population and the other is turbulent stirring by eddies. It is not necessary to assume continuous oscillations such as limit cycles for realization of the first factor. Instead, a certain amount of noise is enough. Random fluctua-tions by environmental noise and turbulent ad-vection by eddies seem to be common in open oceans. Based on these hypotheses, we pro-pose seemingly the simplest method to simulate patchiness formation that can create realistic images. Sufficient noise and turbulence can induce patchiness formation even though the system lies on the stable equilibrium conditions. We tentatively adopt the two-component model with nutrients and phytoplankton, however, the choice of the mathematical model is not essen-tial. The simulation method proposed in this study can be applied to whatever model with stable equilibrium states including one-com-ponent ones.01/2010; 2:320-328.
edited by SPAGNOLO B and FAZIO C., 01/2011: pages 1-245; Università degli Studi di Palermo.
01/2011: pages 1-3;