Modelling Community Structure in Freshwater Ecosystems - download pdf or read online

By Sovan Lek, Michele Scardi, P.F.M Verdonschot, J.-P. Descy, Young-Seuk Park

ISBN-10: 3540239405

ISBN-13: 9783540239406

ISBN-10: 3540268944

ISBN-13: 9783540268949

This quantity offers methods and methodologies for predicting the constitution and variety of key aquatic groups (namely, diatoms, benthic macroinvertebrates and fish), below average stipulations and below man-made disturbance. The cause is to provide an equipped skill for modeling, comparing and restoring freshwater ecosystems. encompasses a CD-Rom illustrating using the fashionable modelling suggestions.

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Additional info for Modelling Community Structure in Freshwater Ecosystems

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In hierarchical BNs, the hierarchical influences of parameters with different probability functions can be modelled. Bayesian belief networks (BBN, also known as belief networks, causal probabilistic networks, causal nets, graphical probability networks, probabilistic cause-effect models, and probabilistic networks) are building the bridge to artificial intelligence by making it possible to integrate expert knowledge into the model. The advantages of BBNs are the ability to represent and manipulate complex models, and the possibility for event prediction based on partial or uncertain data.

After training is stopped, the performance of the network is tested. The MLP learning algorithm involves a forward-propagating step followed by a backwardpropagating step. Like a real neuron, the artificial neuron has many inputs, but only a single output, which can stimulate many other neurons in the network. 4 is called j. The jth input neuron receives from the ith neurons indicated as x. Each connection to the jth neuron is associated to a quantity called weight. The weight on the connection from the ith neuron to the jth neuron is denoted wji.

9. The GA has been applied successfully in ecological modelling. Recknagel et al. (2000) have applied GA to model the abundance of algae. This optimisation procedure steadily evolves best models for given data that unlike ANN become explicitly available. D’heygere et al. (2003) used the GA to select input variables in decision tree models for the prediction of benthic macroinvertebrates. The specific features of GA make them novel tools for ecological modelling. Inductive models (multiple nonlinear regression functions, ANN designs) and deductive models (rule sets, ecosystem process equations and parameters) can be evolved from databases of individual or classes of ecosystems with high validity (Recknagel 2001).

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Modelling Community Structure in Freshwater Ecosystems by Sovan Lek, Michele Scardi, P.F.M Verdonschot, J.-P. Descy, Young-Seuk Park

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