The aim of this work is to study a model of age-structured population with two ... methods (see, for example, the latest edition of the book by Kevorkian and Cole ; ..... Depth acts through the temperature which generally decreases down the.
determining whether the simulation ends in (0,0) or in the non-trivial equilibrium. There must be a separatrix ... Trends in Ecology and Evolution 6, 32. ... Experimental demonstrations of Volterra's periodic oscillations in the numbers of animals.
of fast dynamics considered to be linear, conservative in the global variables and in- ducing a ... processes. In comparison, not much has been done up to now in life sciences ...... in Physics, Biology and Economics, Pergamon, Oxford, 1989.