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Flashcards in October 1 Deck (31):
1

Climate change leads to a changing __________

Ecosystem

2

What is a primary succession?

An ecosystem that starts in an area from rocks.

3

What are the first forms of life in a primary succession?

Lichens and miss because they can survive in harsh conditions

4

What is the roll of lichen and miss in a primary succession?

To break down rock into soil

5

What is so special about arbutus trees?

They are Canada's only broad leafed evergreen and can be a primary colonizer

6

True or false
Gary oaks define our climate

True

7

What is the order of a primary succession?

Rocks ---> mosses and lichen ---> herbs and shrubs ---> Heath mat ---> full grown trees

8

Climate is a ________ limiting factor

Dominant

9

What is edaphic climax.

It refers to the chemical composition of soil and what kind of plants it can support

10

True or false
Edaphic climax can be heat induced.

True

11

What is secondary succession?

Vegetation that grows in an area where there was previously an ecosystem. Could be initiated by a fire burning down a forest

12

True or false
Secondary succession occurs more rapidly in stressful climates than tropical environments.

True

13

Why do secondary successions occur more rapidly in stressful environments when compared to tropical environments?

Because in the stressful environment there are more species competing

14

What are some primary colonizers that are very mobile?

Fireweed
Coconut psalms

15

What is an example of a system engineer?

A beaver
Humans

16

What happens when you remove a forest from land.

Nutrient depletion and leeching

17

What is a plagio climax?

The soil following deforestation cannot sustain as much growth so the secondary succession may not contain trees

18

What is a result of plagio climax?

Grasslands

19

Why would humans introduce non native species to an environment?

For sport (hunting deer) to fix an invasive species problem

20

What are some examples of invasive species

Eurasian water milfoil
Water hyacinth
Zebra mussels
Northern Snakehead (Asian fish)
Knapweed (grassland weed)

21

What does accidental introduction mean?

An invasive species is introduced to an environment.

22

Explain knapweed?

It is an invasive species found in grasslands. It has 10% of the energy of grass which is a problem for grazing cattle. It is allelopathic.

23

What does allelopathic mean?

A plant that exudes chemicals into the soil to inhibit the growth of its competitor plants

24

What is an 'r' species?

Animals that have lots of offspring but don't invest time in raising them. Have shorter life spans. Quantity over quality

25

What is a 'k' species?

Animals that have very few offspring but invest a lot of time in raising them

26

What is an example of an 'r' species?

Capelin fish

27

What is an example of a 'k' species?

Atlantic puffin
Human

28

Often ___ species consume ____ species.

K, r

29

What is a trophic cascade?

A species higher in the food chain getting reintroduced and it effecting the entire system

30

What is an example of a trophic cascade?

Wolves in Yellowstone national park

31

True or false
Ecosystems are dynamic and changing over time

True