Ecological Modeling
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Reviews / Votes
"In addition, it has the advantage that it is draws heavily on the knowledge of one of the world's most experienced ecological modellers, Bill Grant, a former President of the International Society for Ecological Modeling, and an editor of the journal Ecological Modelling." (Biodivers Conserv, 2011) Grant and Swannack are to be commended for their attempt to strip ecological modelling of its complexities and present the bare bones for beginners.... I found the book to be very well written, clear and inclusive of all basic theory for deterministic ecological modelling. The book is admirably concise, which will appeal to many." (Austral Ecology, May 2009) "This is an excellent textbook in population dynamic modeling. The very core of the system approach and system thinking is explained very clearly and in a way that encourages the readers to go modeling." (Ecological Modelling, January 2009) "This book is valuable for its listing of 39 common pitfalls of model development; the 60 citations dividing into four categories of models that can serve as the starting point for most ecological modeling approaches; and the fractal beauty of it all." (CHOICE, January 2009) "A key feature of the book is the use of case studies which are based on straightforward ecological questions with a practical interest." (Environmental Conservation, September 2008)More details
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Content
Preface xi
Acknowledgments xiii
1 Introduction 1
1.1 Common-sense solutions: three exercises 1
1.2 Modeling theory 2
1.3 Modeling practice 2
1.4 Theory, practice, and common sense 3
1.5 Intended use of this book 3
Part 1 Common-sense solutions: three exercises
2 Common-sense solutions 5
2.1 Three problems 6
2.1.1 Harvesting food for the winter 6
2.1.2 Estimating the probability of population extinction 12
2.1.3 Managing the Commons 20
2.2 The systems approach to problem solving 49
2.2.1 The conceptual model (Phase I) 50
2.2.2 The quantitative model (Phase II) 51
2.2.3 Model evaluation (Phase III) 51
2.2.4 Model application (Phase IV) 51
2.3 The three problems revisited: the systems approach in theory and practice 51
Part 2 Modeling theory
3 Theory I: the conceptual model 53
3.1 State the model objectives (Ia) 54
3.2 Bound the system-of-interest (Ib) 55
3.3 Categorize the components within the system-of-interest (Ic) 57
3.3.1 State variables 57
3.3.2 Material transfers 59
3.3.3 Sources and sinks 61
3.3.4 Information transfers 61
3.3.5 Driving variables 62
3.3.6 Constants 62
3.3.7 Auxiliary variables 62
3.4 Identify the relationships among the components that are of interest (Id) 63
3.4.1 Submodels 63
3.5 Represent the conceptual model (Ie) 65
3.5.1 Conceptual-model diagrams 65
3.6 Describe the expected patterns of model behavior (If) 66
4 Theory II: the quantitative model 67
4.1 Select the general quantitative structure for the model (IIa) 68
4.2 Choose the basic time unit for the simulations (IIb) 72
4.3 Identify the functional forms of the model equations (IIc) 72
4.3.1 Information on which to base the choice of functional forms 73
4.3.2 Selecting types of equations to represent the chosen functional forms 73
4.4 Estimate the parameters of the model equations (IId) 75
4.4.1 Statistical analyses within the context of simulation model parameterization 75
4.4.2 Quantifying qualitative information 76
4.4.3 Deterministic- versus stochastic-model parameterization 76
4.5 Execute the baseline simulation (IIe) 77
4.5.1 Baseline simulations for stochastic models 78
5 Theory III: model evaluation 79
5.1 Assess the reasonableness of the model structure and the interpretability of functional relationships within the model (IIIa) 81
5.2 Evaluate the correspondence between model behavior and the expected patterns of model behavior (IIIb) 82
5.3 Examine the correspondence between model projections and the data from the real system (IIIc) 84
5.3.1 Quantitative versus qualitative model evaluation 86
5.4 Determine the sensitivity of model projections to changes in the values of important parameters (IIId) 86
5.4.1 Interpreting sensitivity analysis within a model evaluation framework 87
6 Theory IV: model application 89
6.1 Develop and execute the experimental design for the simulations (IVa) 89
6.2 Analyze and interpret the simulation results (IVb) 91
6.3 Communicate the simulation results (IVc) 91
Part 3 Modeling practice
7 Some common pitfalls 93
7.1 Phase I pitfalls: the conceptual model 93
7.2 Phase II pitfalls: the quantitative model 97
7.3 Phase III pitfalls: model evaluation 100
7.4 Phase IV pitfalls: model application 102
8 The modeling process in practice 105
8.1 Preliminary conceptual model (CM) 106
8.1.1 How to begin 106
8.1.2 Adding new components to the model 108
8.1.3 Describing expected patterns 108
8.1.4 Describing the plan of attack 108
8.2 Intermediate developmental models (IDMi) 109
8.2.1 Evaluate-adjust cycle for each developmental model 110
8.2.2 Sensitivity analysis of the last developmental model 112
8.3 Final model (FM) 112
Part 4 Theory, practice, and common sense
9 The common-sense problems revisted 115
9.1 Harvesting food for the winter 115
9.1.1 The preliminary conceptual model (CM) 115
9.1.2 The last (only) intermediate development model (IDMlast) 116
9.1.3 The final model (FM) 117
9.2 Estimating the probability of population extinction 117
9.2.1 The preliminary conceptual model (CM) 117
9.2.2 The intermediate development models (IDMi) 118
9.2.3 The final model (FM) 118
9.3 Managing the Commons 118
9.3.1 The preliminary conceptual model (CM) 118
9.3.2 The intermediate development models (IDMi) 120
9.3.3 The final model (FM) 121
10 Reflections 123
10.1 The systems approach as a complement to other methods of problem solving 123
10.2 Ecological modeling as a problem-solving process 126
10.3 Expectations for ecological models 127
10.4 A final thought 129
References 131
Appendix A: Introduction to the ecological modeling literature 133
Appendix B: Scientific reports for the examples in Chapter 2 139
B.1 Effect of deforestation on rate of food harvest 139
B.2 Effect of hurricane frequency on probability of population extinction 141
B.3 Effect of stocking rate on forage and animal production 143
Index 149
