+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

The “covariation method for estimating the parameters of the standard Dynamic Energy Budget model II Properties and preliminary patterns

, : The “covariation method for estimating the parameters of the standard Dynamic Energy Budget model II Properties and preliminary patterns. Journal of Sea Research 66(4): 0-288

The covariation method for estimating the parameters of the Dynamic Energy Budget (DEB) theory provides a single-step method of accessing all the core DEB parameters from commonly available empirical data. In this study, we assess the robustness of this parameter estimation procedure and analyse the role of pseudo-data using elasticity coefficients. In particular, we compare the performance of Maximum Likelihood (ML) vs. Weighted Least Squares (WLS) approaches and find that the two approaches tend to converge in performance as the number of uni-variate data sets increases, but that WLS is more robust when data sets comprise single points (zero-variate data). The efficiency of the approach is shown to be high, and the prior parameter estimates (pseudo-data) have very little inuence if the real data contain information about the parameter values. For instance, the effects of the pseudo-value for the allocation fraction?is reduced when there is information for both growth and reproduction, that for the energy conductance is reduced when information on age at birth and puberty is given, and the effects of the pseudo-value for the maturity maintenance rate coefficient are insignificant. The estimation of some parameters (e.g., the zoom factor and the shape coefficient) requires little information, while that of others (e.g., maturity maintenance rate, puberty threshold and reproduction efficiency) require data at several food levels. The generality of the standard DEB model, in combination with the estimation of all of its parameters, allows comparison of species on the basis of parameter values. We discuss a number of preliminary patterns emerging from the present collection of parameter estimates across a wide variety of taxa. We make the observation that the estimated value of the fraction?of mobilised reserve that is allocated to soma is far away from the value that maximizes reproduction. We recognise this as the reason why two very different parameter sets must exist that fit most data set reasonably well, and give arguments why, in most cases, the set with the large value of?should be preferred. The continued development of a parameter database through the estimation procedures described here will provide a strong basis for understanding evolutionary patterns in metabolic organisation across the diversity of life.We assess the robustness of the covariation method for estimating the DEB parameters We analyse the role of pseudo-data using elasticity coefficients. We present the data- and DEB-parameter- collection "add_my_pet" on the web for some 6 species Allocation of mobilised reserve to soma is far from values that would maximize reproduction and population growth rate.


DOI: 10.1016/j.seares.2011.09.004

Other references

Howie, A.J., 2007: The association among C4d staining in renal transplant biopsies, the production of donor-specific HLA antibodies, and graft outcome. Transplantation 83(4): 373-374

Scott F.L.moureux; Kailey A.S.ewart; Andrew C.F.rbes; David Fortin, 2006: Multidecadal variations and decline in spring discharge in the Canadian middle Arctic since 1550 AD. Geophysical Research Letters 33(2)

Brzeziński, R., 1995: Two decades of the concept of alexithymia. In the early 1970's, American researchers Sifneos and Nemiah, using the results of there own studies and those of Ruesch, McLean, Marty and others, proposed an original concept of psychosomatic disorders, called the concept of alexithymia. It...

Roman, G.; Hâncu, N., 2004: Metabolic syndrome--new insights into a growing entity. Metabolic syndrome is a cluster of cardiovascular risk factors. Pathogenesis of metabolic syndrome implies 3 potential etiological mechanisms: obesity and adipose tissue disorders, insulin resistance, and a constellation of independent factors. Cl...

Chen Muhong; Chen Shaomou, 1989: On carbonate dissolution and the distribution model of deep sea sediment types in South China Sea. The state of preservation of calcareous shells such as pteropods, foraminifera and nannofossils in the sediments from the South China Sea shows that there is a phenomenon of carbonate dissolution in the water. Based on the characteristics of CaCO3...

Tatarintsev, V.P.; Prudskikh, Y.V., 1976: The effects of X-irradiation of the testes on the reproductive performance of cocks of laying lines. The testes of 60 Leghorn line 63 and line B cocks were given 0-120 rad of X-irradiation. Treatment had no consistent effects on semen characters or fertilising ability, or on the survival and growth of the progeny.

Fujimori, T.T.naka, H1; Kato, K., 1983: Stress compounds in tobacco callus infiltrated by Pseudomon as solanacearum Nicotiana tabacum, nonpathogenic bacteria. Phytochemistry 2(4): 1038

Yoo, B-Chun.; Kragler, F.; Varkonyi-Gasic, E.; Haywood, V.; Archer-Evans, S.; Lee, Y.Moo.; Lough, T.J.; Lucas, W.J., 2004: A systemic small RNA signaling system in plants. Systemic translocation of RNA exerts non-cell-autonomous control over plant development and defense. Long-distance delivery of mRNA has been proven, but transport of small interfering RNA and microRNA remains to be demonstrated. Analyses performed...

Jayne, D.R.; Lockwood, C.M., 1994: New strategies in the treatment of systemic vasculitis. Annales de Medecine Interne 145(8): 595-600

Opaleva-Stegantseva, V.A.; Ratovskaia, V.I.; Veber, O.P., 1970: Potassium and sodium levels in the cardiac muscle in sudden death from acute coronary insufficiency. Kardiologiia 10(10): 79-84