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Theoretical and Applied Climatology

, Volume 81, Issue 3–4, pp 137–147 | Cite as

Consequences of inter-specific competition among multiple adaptive species in Daisyworld

  • T. Pujol
  • J. Fort
  • V. Méndez
Article

Summary

We investigate the consequences of Darwinian selection in a daisymodel with uniform temperature, inter-specific competition and multiple daisies. The assumption of a higher competition between species than within them allows for the coexistence of more than two species in equilibrium. Thus, it is the first time that a high biodiversity with equal environment-altering traits at the same trophic level in a daisymodel is reported under stationary conditions. Adaptation in the biota occurs through mutations, leading to changes in the optimum temperature in order to achieve the maximum growth rate at the individual level. We study the planetary sensitivity (i.e. the variation of the global mean temperature due to a 1% change in solar radiation) as a function of the strength of the inter-specific competition and of the number of different species that grow in the model. We find the following: 1) by fixing the parameter that defines the strength of the inter-specific competition, the planetary sensitivity increases as biodiversity increases; 2) by keeping constant the number of different species in the planet, the planetary sensitivity also increases as competition between species increases. In any case, however, the planetary sensitivity associated with adaptive daisies is much greater than that obtained from non-adaptive species. However, the range of mean solar radiation where biota grows in the planet is substantially larger for adaptive species than for non-adaptive ones. This result suggests that adaptation of multiple species with the same environmental-altering traits may not imply a strong regulation of the mean planetary temperature, which differs with recent studies that analyse adaptation of single species. Similar results are obtained by using a constrained adaptation and non-uniform temperatures.

Keywords

Waste Water Water Pollution Solar Radiation Trophic Level Single Species 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 2005

Authors and Affiliations

  • T. Pujol
    • 1
  • J. Fort
    • 1
  • V. Méndez
    • 2
  1. 1.Departament de FísicaUniversitat de GironaGironaSpain
  2. 2.Facultat de Ciíncies de la SalutUniversitat Internacional de Catalunya, c/Gomera s/nSant Cugat del Vallís (Barcelona)Spain

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