test #2 - 10/11/24

Question 1

Demographics

Answer 1

Study everything about populations.

Question 2

Population

Answer 2

Groups of similar species.
- Living in the same place, same time, and able to interbreed/intergrade successfully.

Question 3

Populations are described by:

Answer 3

1.) Size - # of organisms om population (species richness)
2.) Density - # organisms per unit area
3.) Dispersion - How those #’s per unit area are distributed.

Question 4

3 dispersion types:

Answer 4

1. EVEN- Low density (territorial) High density (avoid competition)
2. RANDOM - Wind-dispersed: seeds, worms
3. CLUMPED - Herding & organized colonies

Question 4

Survival of a population:

Answer 4

1.) Fitness - Ability to reproduce successfully
2.) Survivorship - Life span distribution over time
3.) Limits to resources - Limit what’s available for growth

Question 5

r-strategists:

Answer 5

• rapid reproduction
• fast pregnancy
• quick life cycle
• higher reproductive rate
• less parental involvement
• EX: insects, fish, mice, bacteria

Question 6

k-strategists:

Answer 6

• slow reproduction
• long pregnancy
• slow life cycle
• lower reproductive rate
  long parental involvement
• EX: elephants, humans, penguins

Question 6

Carrying capacity -

Answer 6

Max # of organisms an ecosystem can hold. (sustainable level)
- Boom = rapid growth
- Bust = rapid death

Question 7

Limiting Factor -

Answer 7

The one thing that limits a population

Question 8

Exponential growth (j curve)

Answer 8

r-strategists
- keeps going straight up

Question 8

Biotic

Answer 8

• Living organisms
• density dependent

Question 8

Abiotic

Answer 8

• Non-living organisms
• density independent

Question 9

Logistic growth (s curve)

Answer 9

k-strategists
- stop at carrying capacity

Question 9

density independent ex:

Question 10

density dependent ex: