title: Stability and instability in evolution.
abstract: In this paper we propose a mechanism which tries to explain the presence of periods of stability and instability which occur during the evolution of living forms. According to the Gaia hypothesis there are feedback mechanisms which stabilise the biosphere. Adding the presence of parameters which are out of control of the biosphere and of different time-scales, we propose a model which might explain the periods of instability.
authors.affiliation: Istituto di Matematiche Applicate "U. Dini", Universitá di Pisa, Pisa, 56124, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Benci
authors.forename: L
authors.initials: L
authors.lastname: Galleni
mesh_terms: D000818:Animals; D005075:Biological Evolution; D019295:Computational Biology; D017753:Ecosystem; D005246:Feedback; D008954:Models, Biological