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Trying to evolve symbiosis

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Ammeh:
I've made a fairly simple symbiote that latches onto a veg, shares energy, and causes the veg and itself to produce slime+shell and share them equally. The plant gets most of the waste since it can get rid of it, but otherwise for sharing it's energy it gets a whole load of protection from predators.

I threw these symbiotes in with a load of zero bots in the hope that they'd evolve a symbiotic link, ie: zerobots evolved to hunt things that weren't symbiotes, symbiote made zerobot better at hunting. After about 5 failed sims though, i just can't figure out how to trigger an evolutionary pressure that forces the symbiosis  

Any ideas?

Houshalter:
Maybe two different bots that are good at two different things that search for a bot from the other species then tie together and act as a single bot. I think this is how multicellular organisms evolved in real life...

Numsgil:
It's hard.  It's sort of a mystery of modern evolutionary biology how symbiosis evolves (we have some good theories but they aren't really backed up by any observational or experimental data).

The best bet I think is to have several separate sims and mix them from time to time.  You don't need to cooperate if you aren't competing.

Houshalter:

--- Quote ---we have some good theories but they aren't really backed up by any observational or experimental data
--- End quote ---
If theres no data or expirements then their not theories, just hypothesises.  

Numsgil:
There's significant circumstantial evidence looking at the fossil record.  In the soft sciences, that's often all the data you get.

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