DAISY WORLD
Daisyworld is a hypothetical planet and computer model developed by James Lovelock and Andrew Watson to illustrate how physically realistic feedback between life and its environment can give rise to planetary self-regulation without foresight or planning by the organisms themselves. The model was originally developed in response to early criticism of the Gaia hypothesis and has become a widely used conceptual model in ecology, Earth system science, and studies of geosphere–biosphere interactions.
In its original form, Daisyworld consists of a fictional planet populated only by black and white daisies, whose contrasting albedos respectively warm and cool the planet. As the luminosity of the planet's star changes, competition between the two daisy populations alters the planet's overall reflectivity, producing negative feedback that maintains surface temperatures near an optimum for daisy growth over a broad range of solar luminosities.
Daisyworld has been used extensively as a simplified model for investigating the biological regulation of planetary environments and the emergence of ecological feedbacks. Later versions introduced additional species, trophic interactions, habitat fragmentation, and biogeochemical processes to explore the robustness of self-regulation under more complex conditions. The model has also attracted criticism because its self-regulating behaviour depends in part on simplifying assumptions of the original model and because it omits many features of the Earth system.
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