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A multi-tier methodology for the estimation of individual-specific parameters of DEB models

Author

Listed:
  • Oliveira, Diogo F.
  • Marques, Gonçalo M.
  • Carolino, Nuno
  • Pais, José
  • Sousa, João M.C.
  • Domingos, Tiago

Abstract

Intraspecific variability plays a key role in modeling population dynamics and ecological interactions. It is also a fundamental issue for agriculture, livestock production, and aquaculture. Dynamic Energy Budget (DEB) theory is a metabolic theory that can provide insights for these applications, as it can accurately predict the response of an organism to changes in environmental conditions. However, DEB model parameters are typically estimated for the species using mean trait values, neglecting individual differences. With advancing data collection technologies, there is a growing need to leverage individual data to calibrate DEB models. In this paper, we propose a multi-tier methodology for estimating individual-specific DEB parameters based on techniques and principles of the standard DEB estimation procedure. Individual data is often not sufficiently complete, therefore we compliment it available data on organisms of the same species. To avoid estimation bias, we employ a hierarchical tier structure. Data is categorized into tiers, depending on how general it is. In each tier, only a subset of the parameters is estimated depending on available data. The estimation proceeds in a top-down approach, starting with the most general tier and culminating in the individual tier. Values obtained in previously estimated tiers are used as pseudo-data to anchor the parameter estimation. In this way, we obtain biologically sensible individual parameter estimates in an efficient manner. As a case study, we apply our methodology to a dataset that contains weight and feed intake measurements for 52 individuals of the Mertolenga cattle breed from two performance trials. We conclude that variability in the surface-specific maximum assimilation rate and the digestion efficiency is needed to accurately model the individual data. Furthermore, the analysis of tier parameters and individual parameter distributions uncovers differences in the diets fed to the animals.

Suggested Citation

  • Oliveira, Diogo F. & Marques, Gonçalo M. & Carolino, Nuno & Pais, José & Sousa, João M.C. & Domingos, Tiago, 2024. "A multi-tier methodology for the estimation of individual-specific parameters of DEB models," Ecological Modelling, Elsevier, vol. 494(C).
    • Handle: RePEc:eee:ecomod:v:494:y:2024:i:c:s0304380024001674
    DOI: 10.1016/j.ecolmodel.2024.110779
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    References listed on IDEAS

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    1. Peter Bickel & Bo Li & Alexandre Tsybakov & Sara Geer & Bin Yu & Teófilo Valdés & Carlos Rivero & Jianqing Fan & Aad Vaart, 2006. "Regularization in statistics," TEST: An Official Journal of the Spanish Society of Statistics and Operations Research, Springer;Sociedad de Estadística e Investigación Operativa, vol. 15(2), pages 271-344, September.
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    3. Marques, Gonçalo M. & Teixeira, Carlos M.G.L. & Sousa, Tânia & Morais, Tiago G. & Teixeira, Ricardo F.M. & Domingos, Tiago, 2020. "Minimizing direct greenhouse gas emissions in livestock production: The need for a metabolic theory," Ecological Modelling, Elsevier, vol. 434(C).
    4. Grossowicz, Michal & Marques, Gonçalo M. & van Voorn, George A.K., 2017. "A dynamic energy budget (DEB) model to describe population dynamics of the marine cyanobacterium Prochlorococcus marinus," Ecological Modelling, Elsevier, vol. 359(C), pages 320-332.
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