Chapter 9 - Oceans and Fisheries Flashcards

1
Q

When was the first time an agreement has been reached. Agreement explicitly acknowledges the need for a clearer understanding of the impacts of fishing prior to allowing fishing?

A

Agreement to Prevent Unregulated High Seas Fisheries in the Central Artictic Ocean, 2018

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

____________- are the key components in global cycles and energy flows.

A

Oceanic ecosystems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is one of the major difficulties in working against sustainable human use of the oceans?

A

Lack of understanding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

On land, _________ is the most limiting factor for life.

A

water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In oceans, the limiting factor are ____________

A

nutrients

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the most productive areas of oceanic ecosystems?

A
  • Coastal zones
  • Upwellings from deep ocean return nutrients to the surface layers
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Surface waters in the ________________ are warmer and have higher light levels, resulting in higher productivity

A

euphotic zone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Define Thermocline:

A

A sharp transition in temperature between the warmer surface waters and the cooler waters underneath

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The deepest part of the ocean is more than __________ metres deep, but more than three- quarters of the ocean is between _______________ metres deep

A

9,000, 4,000 and
6,000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is the most productive areas in oceanic ecosystems?

A

Continental shelves at a depth of less than 200 meters, and within the top 100m.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When does Acidification occur?

A

When water and CO2 mix to form carbonic acid (H2CO3). Carbonic acid releases hydrogen ions (H+), which increases the acidity of the water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Oceans are about _____ % more
acidic compared to pre-industrial times.

A

30

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Define Thermohaline Circulation:

A

The carbon-saturated water moves around the globe

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is movement on subsrurface water of oceans densities contrasting from?

A

Temperature and Salinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How will global warming affect the polar icecaps?

A

Melting, will reduce density in sea water and make thermohaline circulation weaker –shutdown of this circulation could trigger a new ice age

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Coral reefs are known as the _________________ of the sea.

A

rain forests

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

___________ are among the most diverse and productive ecosystems on Earth

A

Coral reefs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What are coral reefs mainly made of?

A

Countless number of individual coral polyps held together by calcium carbonate (CaCO3)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What kind of algae lives inside corals skeletons and produce their food?

A

Photosynthetic / zooxanthellae algae

20
Q

What is the technical explanation of coral bleaching?

A

When water temperatures get too warm, the zooxantheliae are often expelled

21
Q

What are the main management challenges facing ocean ecosystems a result of?

A
  1. Fisheries pollution
  2. Coastal development
  3. Climate change
22
Q

Where are the most important fishing grounds of the world found?

A

On and along continental shelves within less than 370 kms of the shore

23
Q

Fisheries supply some ____% of the world’s annual animal protein supply

24
Q

True or false: Fish populations are declining, and the fish being caught are smaller than those caught in the past.

25
Q

What are the two main forms chemical pollutants take?

A
  • Toxic Materials
  • Nutrients
26
Q

What is one rapidly emerging impact relating to pollution?

A

Endocrine Disruption

27
Q

Define Endocrine Disruption;

A

The interference of normal bodily processes such as sex, metabolism, and growth by chemicals in such products as soaps and detergents that are released into an ecosystem

28
Q

What kind of fish are appearing all over Europe and the Great Lakes?

A

Hermaphroditic Fish

29
Q

What does oxygen depletion occur as a result of?

A

Nutrient Enrichment

30
Q

What kind of areas are multiplying 10-fold near coastal areas since the 1950s?

A

Hypoxic / oxygen-deficient areas

31
Q

What kind of areas have quadrupled in size since 1950?

A

Anoxic Areas

32
Q

The growth of ___________ could promote the development of far more male fish than female, threatening some species with extinction

A

dead zones

33
Q

True or false: 84% of seabirds have plastic in their stomach.

34
Q

What are the main sources of marine toxic pollution in Canada?

A

Deposition of Airborne pollutants

35
Q

Many of the world’s main oilfields are situated in _______________.

A

sedimentary basins under the oceans

36
Q

______ of the world’s 33 mega-cities are coastal.

37
Q

True or false: Half of the countries in the world do not have any coastal legislation to address their highly degraded coastal environments

38
Q

What is an example of a coastal mega-city?

A

Mumbai, India

39
Q

How much have sea levels risen since 1870 - 2013?

40
Q

Changes in _________________ could cause widespread destruction of coral reef ecosystems or slow or shut down the thermohaline circulation.

A

water temperature

41
Q

What is one of the key international legal frameworks regarding oceans?

A

United Nations Convention on the Law of the Sea (UNCLOS)

42
Q

Where has the longest coastline of any country and the second largest continental shelf?

43
Q

What is the DFO?

A

Department of Fisheries and Oceans

44
Q

What are the five Marine Ecozones?

A
  • Pacific Marine
  • Arctic Basin
  • Arctic Archipelago
  • Northwest Atlantic
  • Atlantic
45
Q

What are some of the key concerns associated with aquaculture?

A

escapement, disease, lice, pollution, predator control, energetics, social dimensions, human health, genetic modification