4.3 aquatic food production systems

Question 1

range and productivity of aquatic ecosystems

Answer 1

dominant source of primary productivity: phytoplankton –> single-celled photosynthetic organisms

Question 2

marine food chain

Answer 2

• longer + more complex than terrestrial ecosystems
• more energy transmitted up food chain

Question 3

demand for aquatic food resources

Answer 3

• demand increases
• increase in population
• more money = more protein
• perception of fish as healthy

Question 4

we’re catching more fish because…

Answer 4

improvements in technology
- change from stail to steam
- refrigeration
- fish-finders: GPS

Question 5

why it’s hard to change consumer behaviour

Answer 5

• consumers are lazy / disinterested
• labeling of seafood –> difficult to understand
• people may buy purely on economic grounds