Lecture 7

Question 1

What are some examples of aquatic ecosystems? (5)

Answer 1

• Oceans
• Estuaries & Bays
• Lakes
• Rivers and Streams
• Wetlands

Question 2

describe ocean ecosystems

Answer 2

• the ultimate “sink”
• Iron is actually limiting!
• Mercury, lead, cadmium, chromium

Question 3

describe estuaries and bays

Answer 3

• most at risk
• Sheltered
• Terrestrial inputs
• Large populations

Question 4

describe ocean acidification

Answer 4

page 4

Question 5

describe ocean warming

Answer 5

textbook

Question 6

what are some dangers lakes/aquatic ecosystems of lakes are facings

Answer 6

• (Pen)ultimate sinks
• Terrestrial run-off
• Concentrated in sediments

Question 7

what are 6 dangers Rivers and streams/aquatic ecosystems of rivers and streams are facing?

Answer 7

• Industrial waste
• Agricultural waste
• Sewage
• Garbage
• Channel alterations
• Heat pollution

Question 8

what is floodplain degradation?

Answer 8

textbook

Question 9

Name some reasons why wetlands are suffering and describe them (3)

Answer 9

1. )Reduction/alteration of wetland acreage
   - water temp increases
   - pH changes
   - atmospheric deposition.
2. ) Contaminants
   - Hydrocarbon, radionuclides from oil and gas production
   - Oil can alter reproduction, growth, and behavior of wetland organisms. Plants suffocate when oil blocks their stomata
3. ) Polycyclic aromatic hydrocarbons (PAHs) enter estuarine wetlands through industrial effluent and atmospheric deposition
   - concentrate in sediments and thus contaminate benthic organisms