Lecture 2

Question 1

What is the first step in the procedure of building a model?

Answer 1

Question 2

Why is it important to clearly define the goals of a model?

Answer 2

• It ensures the model is focused on answering the correct questions.
• Helps in deciding the complexity and structure of the model (e.g., size structure for fish populations).
• Prevents unnecessary complexity or wrong model application.

Question 3

What are the main steps in constructing a model?

Answer 3

• Problem definition
• Conceptualization of the model
• Mathematical formulation
• Numerical formulation
• Verification
• Sensitivity analysis
• Calibration
• Validation

Question 4

What is the goal of model conceptualization?

Answer 4

Question 5

What is a conceptual model?

Answer 5

Question 6

What types of conceptual models exist?

Answer 6

Question 7

What is a black box model?

Answer 7

Question 8

How do you distinguish between a black box model and a mechanistic model?

Answer 8

Question 9

What are some examples of state variables in a conceptual model?

Answer 9

Question 10

What is the role of mathematical formulation in modeling?

Answer 10

Question 11

What is an ordinary differential equation (ODE) in modeling?

Answer 11

Question 12

What are initial and boundary conditions in mathematical models?

Answer 12

Question 13

What is the difference between deterministic and stochastic models?

Answer 13

Question 14

What is the process of model verification?

Answer 14

Question 15

What are some key checks during the mathematical formulation?

Answer 15

Question 16

What should you do if a model result seems strange or unexpected?

Answer 16

Question 17

What is sensitivity analysis in modeling?

Answer 17

Question 18

What is the purpose of model calibration?

Answer 18

Question 19

What is the final step after model calibration and verification?

Answer 19

Question 20

How do you verify the internal logic of a model?

Answer 20

Question 21

What is the difference between deterministic and stochastic models?

Answer 21

Question 22

What type of models do we generally use in ecological modeling?

Answer 22

Question 23

What are numerical solutions in modeling?

Answer 23

Question 24

What checks should be performed on the mathematical formulation?

Answer 24

Question 25

What is verification in modeling?

Answer 25

Question 26

How do you verify the internal logic of a model?

Answer 26

Question 27

How do you perform model verification?

Answer 27

Question 28

What is numerical formulation in modeling?

Answer 28

Question 29

What is sensitivity analysis?

Answer 29

Question 30

What is calibration in modeling?

Answer 30

Question 31

What is validation in modeling?

Answer 31

Question 32

3 formula for a model of biogeochemical cycling in salt marshes

Answer 32

Question 33

What are the main equations for biogeochemical cycling in salt marshes?

Answer 33

Question 34

How do you verify a model?

Answer 34

Question 35

How do you verify the order of magnitude in model results?

Answer 35

Question 36

What is the first step in constructing an ecological model?

Answer 36

Defining the purpose or establishing the scientific/management question the model will address.

Question 37

What are empirical models?

Answer 37

Question 38

What are mechanistic models?

Answer 38

Models that represent the underlying processes driving system changes.

Question 39

What is the difference between deterministic and stochastic models?

Answer 39

Deterministic models provide consistent results for the same inputs, while stochastic models include randomness in their predictions.

Question 40

What is a conceptual model, and how is it represented?

Answer 40

A visual representation of how the system works, using boxes for state variables and arrows for flows.

Question 41

What tool is commonly used to create ordinary differential equation (ODE) representations?

Answer 41

SIMULINK.

Question 42

What are black-box models?

Answer 42

Models where internal mechanisms are not explicitly modeled, but input-output relationships are analyzed (e.g., AI models).

Question 43

Provide an example of a black-box model.

Answer 43

Question 44

What is involved in the mathematical framework of an ecological model?

Answer 44

Writing equations that describe variable interactions (e.g., biomass growth and carrying capacity).

Question 45

What are initial and boundary conditions?

Answer 45

Initial conditions: Define the starting point of state variables (e.g., initial fish population). Boundary conditions: Specify external influences at the edges of the model's spatial domain (e.g., nutrient inflow).

Question 46

What is the purpose of calibration in ecological modelling?

Answer 46

To adjust parameters so the model’s behavior aligns with real-world data.

Question 47

What is model validation?

Answer 47

The process of testing a model’s predictive capability using independent datasets.

Question 48

What is the European Regional Seas Ecosystem Model (ERSEM)?

Answer 48

A model that simulates nutrient cycling and food web dynamics using mechanistic equations.

Question 49

Verification of a model

Answer 49