Musings on Daisyworld

James Lovelock and Andrew Watson’s classic computer simulation Dasiyworld is a major proof for the Gaia (“Earth as one organism”) hypothesis. In the simulation, a planet has only two species, white daisies and black daisies. The black daisies warm themselves; the white ones cool themselves. According to the simulation, when the planet’s temperature is cooler there is a predominance of black daisies, and when it warms the white daisies increase in number as the black ones decrease. The idea is that the combination of the white and black flowers serves to regulate the planet’s temperature to a certain extent. The Daisyworld planet’s temperature is more moderate than that of an empty planet because of this balancing effect. This has been used to “prove” the Gaia hypothesis because it highlights that fact that organisms can unwittingly work together to function as one large organism.

However, I feel I must deprecate this idea. Though I cannot refute the fact that organisms often work together as a single organism, there are too many random factors involved for this hypothesis to be true. Evolution itself is a random factor, brought about by the mutation of genes. A random mutation could easily create a new species that does not fit into “Gaia.” I suspect humans are the perfect example of this—how is it that Gaia would welcome a species that is psychologically unstable but can build nuclear weapons? Also, environmental or other external factors can clearly unbalance this cycle.

Because of all this, it is absurd to think that this kind of a relationship between species exist for more than a short period of time. Though this kind of symbiosis can occasionally occur, the idea that the whole planet follows this pattern seems a bit of a stretch.