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Hi all, I think they question here is "what are you trying to model?" It sounds like your agents follow the popular James McGill Buchanan (economist)/general understanding of "selfish genes" rules, and are acting as would be expected. It's probably a great demonstration of agents finding the Nash equilibrium for this landscape and distribution of strategies. -j. On Mon, Jul 9, 2018, 3:59 PM Dave Dixon <[log in to unmask]> wrote: > Xavier, > > I think it's a misrepresentation to state that most evolutionary > theories say there is nothing to limit population growth. Ecosystems are > complex and their occupants co-evolve over long periods of time. Most > simplified equilibrium population models abstract that complexity into a > carrying capacity, beyond which things go poorly for the species of > interest. There is also a lower limit below which genetic diversity > takes a hit. Apex predators like sharks don't eat fish until they starve > to death - the low density of food means a low density of sharks which > limits shark reproduction. That's what goes in cycles. Thrive and crash > cycles are unusual in unperturbed ecosystems. > > Rapa Nui and Tikopia are extreme examples of very small ecosystems with > invasive macro organisms: humans and pigs. While Tikopians found their > carrying capacity early, Rapa Nui people were not so fortunate. > > -dave > > On 07/09/2018 11:20 AM, Xavier VIlà wrote: > > And the answer, according to most evolutionary theories, is also simple: > > > > "Nothing" > > ######################################################################## > > To unsubscribe from the SIMSOC list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SIMSOC&A=1 > On Mon, Jul 9, 2018, 3:59 PM Dave Dixon <[log in to unmask]> wrote: > Xavier, > > I think it's a misrepresentation to state that most evolutionary > theories say there is nothing to limit population growth. Ecosystems are > complex and their occupants co-evolve over long periods of time. Most > simplified equilibrium population models abstract that complexity into a > carrying capacity, beyond which things go poorly for the species of > interest. There is also a lower limit below which genetic diversity > takes a hit. Apex predators like sharks don't eat fish until they starve > to death - the low density of food means a low density of sharks which > limits shark reproduction. That's what goes in cycles. Thrive and crash > cycles are unusual in unperturbed ecosystems. > > Rapa Nui and Tikopia are extreme examples of very small ecosystems with > invasive macro organisms: humans and pigs. While Tikopians found their > carrying capacity early, Rapa Nui people were not so fortunate. > > -dave > > On 07/09/2018 11:20 AM, Xavier VIlà wrote: > > And the answer, according to most evolutionary theories, is also simple: > > > > "Nothing" > > ######################################################################## > > To unsubscribe from the SIMSOC list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SIMSOC&A=1 > ######################################################################## To unsubscribe from the SIMSOC list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=SIMSOC&A=1