By initializing the model with trait values observed in the field and by commencing harvesting after 100 years of natural selection, we might therefore be underestimating the predicted evolutionary effects of milder harvesting regimes.
A trait set size of five was chosen as a compromise between model convergence (models with more traits sometimes did not converge, and convergence times were prohibitively long) and the desirability of searching for covariance among as many traits as are often used in evolutionary studies of standard metric traits.
Classification criteria are organized in a hierarchical order that creates a dichotomous tree with each end node representing a group of models with similar traits.
These models were compared to mixture models with fewer traits (Models 2 and 3) and a classical linear animal model for growth (Model 1).
All association models with all traits were re-analyzed using GENSTAT [ 41] to check for any discrepancy.
The multi-trait model for C4 0 to C12 0 resulted in the same pathway as the model with 14 traits, suggesting that the restriction in parameters due to latent variables did not influence this particular pathway.
In this study, however, no PC was involved in the MLM for the association analysis of DTF, DTM and PH, but two PCs were involved for DFTM (Additional file 2), indicating that the improvement of model fitness by involving P in the K model could vary with traits.
My hunch is that many shoppers, hearing the Jaguar name, still picture a neighbor's vintage model with the traits of a beautiful teenage rocker: moody, garage-bound and usually broke.
Testing the model with individual traits revealed those that provided the best predictions on their own.
We therefore studied sympatric, asexual populations using an individual-based model with discrete traits where fitness is an explicit function of resource consumption, and added trade-offs to this model by adding a simple cost-function to the Monod equation.
