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Comparison of exergy found by a classical thermodynamic approach and by the use of the information stored in the genome

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  • Ludovisi, Alessandro
  • Jørgensen, Sven Erik

Abstract

It is possible to calculate the exergy for organisms based on classic thermodynamics as already demonstrated by Mejer and Jorgensen [Mejer, H., Jorgensen, S.E., 1979. Exergy and ecological buffer capacity. State-of-the-art in Ecol. Model. 7, 829–846]. The calculation of exergy as eco-exergy, which is based on the information stored in the genome, has lately been proposed by Jørgensen and co-workers. Recently, Ludovisi [Ludovisi, A., 2009. Exergy vs information in ecological successions: interpreting community changes by a classical thermodynamic approach. Ecol. Model. 220, 1566–1577] has put forward a method based on classical thermodynamics, which leads to the calculation of “virtual” values of concentration at equilibrium for a number of organic compounds (VEC) and freshwater organisms (VECE). This paper compares the two approaches by analysing the correlation existing between the VECE- and the β-values derived by Jørgensen et al. [Jørgensen, S.E., Ladegaard, N., Debeljak, M., Marques, J.C., 2005. Calculations of exergy for organisms. Ecol. Model. 185, 165–175]. It was found that there was a good correlation, which can be useful for estimating β-values for organisms whose genome is not known in a sufficient detail. The relationship between VECE- and β-values suggests that two proposed thermodynamic orientors based on these quantities – the eco-exergy index and the structural information – should lead to coherent results when applied to the evaluation of the development state of ecosystems. A numerical simulation shows that this expectation is verified in a major case, but also that different, even opposite, responses can arise, depending on the biological composition of the biocoenosis investigated.

Suggested Citation

  • Ludovisi, Alessandro & Jørgensen, Sven Erik, 2009. "Comparison of exergy found by a classical thermodynamic approach and by the use of the information stored in the genome," Ecological Modelling, Elsevier, vol. 220(16), pages 1897-1903.
  • Handle: RePEc:eee:ecomod:v:220:y:2009:i:16:p:1897-1903
    DOI: 10.1016/j.ecolmodel.2009.04.019
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    1. Ludovisi, A., 2009. "Exergy vs information in ecological successions: Interpreting community changes by a classical thermodynamic approach," Ecological Modelling, Elsevier, vol. 220(13), pages 1566-1577.
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    Cited by:

    1. Nielsen, S.N. & Müller, F., 2009. "Understanding the functional principles of nature—Proposing another type of ecosystem services," Ecological Modelling, Elsevier, vol. 220(16), pages 1913-1925.
    2. Dehao Tang & Xingjian Liu & Xutao Wang & Kedong Yin, 2018. "Relationship between the Main Communities and Environments of an Urban River and Reservoir: Considering Integrated Structural and Functional Assessments of Ecosystems," IJERPH, MDPI, vol. 15(10), pages 1-22, October.
    3. Jørgensen, Sven Erik & Ludovisi, Alessandro & Nielsen, Søren Nors, 2010. "The free energy and information embodied in the amino acid chains of organisms," Ecological Modelling, Elsevier, vol. 221(19), pages 2388-2392.
    4. Ludovisi, Alessandro & Roselli, Leonilde & Basset, Alberto, 2012. "Testing the effectiveness of exergy-based tools on a seasonal succession in a coastal lagoon by using a size distribution approach," Ecological Modelling, Elsevier, vol. 245(C), pages 125-135.

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