Barausse 1+2

Question 1

What are Population Dynamics?

Answer 1

Question 2

What factors primarily influence population dynamics in marine ecosystems?

Answer 2

Question 3

Why are population dynamics models crucial in marine conservation?

Answer 3

Question 4

Define recruitment in the context of marine biology.

Answer 4

Question 5

Why is recruitment variability important in marine population management?

Answer 5

Question 6

What factors influence recruitment in marine species?

Answer 6

Question 7

What is the spawner-recruit relationship in marine biology?

Answer 7

Question 8

Why are spawner-recruit relationships important in fisheries management?

Answer 8

Question 9

What factors can affect the spawner-recruit relationship?

Answer 9

Question 10

What are the primary causes of natural mortality in marine species?

Answer 10

Question 11

How do human activities contribute to mortality in marine populations?

Answer 11

Question 12

What specific factors affect the mortality of juvenile and larval marine species?

Answer 12

Question 13

Explain the concept of compensation in population dynamics.

Answer 13

Question 14

What is depensation, and how does it affect marine populations?

Answer 14

Question 15

Why are compensation and depensation important concepts in fisheries management?

Answer 15

Question 16

Define fish stocks and explain their significance in marine conservation.

Answer 16

Question 17

How are fish stocks managed in fisheries?

Answer 17

Question 18

What are the challenges in managing fish stocks?

Answer 18

Question 19

What are surplus production models, and what do they predict?

Answer 19

Question 20

How are surplus production models used in fisheries management?

Answer 20

Question 21

What are the limitations of surplus production models?

Answer 21

Question 22

What is the purpose of the Beverton and Holt model in fisheries management?

Answer 22

Question 23

What are the key features of the Beverton and Holt model?

Answer 23

Question 24

Why is the Beverton and Holt model important in fisheries management?

Answer 24

Question 25

What is the Ricker model used for in population dynamics?

Answer 25

Question 26

What are the key features of the Ricker model?

Answer 26

- Used in scenarios where **overcompensation** is a concern, such as in populations where high spawner densities can lead to reduced recruitment due to overcrowding, competition, or limited resources. - Overcompensation occurs at **high** population sizes, where too many individuals lead to a **decrease** in recruitment.

Question 27

How is the Ricker model applied in fisheries management?

Answer 27

- The Ricker model can be very useful in fisheries management when dealing with populations where overcompensation is a risk. - By allowing controlled fishing at high population densities, managers can **prevent the decline in recruitment** that overcompensation might cause

Question 28

Describe the Shepherd model and its role in population dynamics.

Answer 28

Question 29

What makes the Shepherd model more flexible than the Beverton and Holt or Ricker models?

Answer 29

Question 30

Why is the Shepherd model important in fisheries management?

Answer 30

Question 31

What is Maximum Sustainable Yield (MSY)?

Answer 31

Question 32

Why is MSY a key concept in fisheries management?

Answer 32

Question 33

What are the challenges associated with using MSY in fisheries management?

Answer 33

should always be proportional to the biomass

Question 34

How do Natural Environmental Factors influence Marine Populations?

Answer 34

Question 35

How do human activities impact marine populations?

Answer 35

Question 36

Why is it important to include both environmental and anthropogenic effects in population models?

Answer 36

Question 37

What does model fitting mean in the context of population dynamics?

Answer 37

Question 38

Why is the quality of data input critical in population models?

Answer 38

- CPUE is often used as a key data input in population models because it provides an estimate of relative abundance—how much fish is being caught per unit of effort - garbage-in, garbage-out

Question 39

What are the challenges associated with model fitting in population dynamics?

Answer 39

Question 40

What does Maximum Economic Yield (MEY) represent in fisheries management?

Answer 40

Question 41

How does MEY differ from Maximum Sustainable Yield (MSY)?

Answer 41

Question 42

What is the Gordon-Schaefer model, and what is it used for?

Answer 42

Question 43

What are the key components of the Gordon-Schaefer model?

Answer 43

Question 44

Why is the Gordon-Schaefer model important in fisheries management?

Answer 44

Question 45

Define Catch Per Unit Effort (CPUE) and its significance in fisheries.

Answer 45

Question 46

How is CPUE used in fisheries management?

Answer 46

Question 47

What are the limitations of using CPUE as an indicator?

Answer 47