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Flashcards in Local Ecosystem Deck (28)
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1

Aquatic environments

Water environments
Ocean lakes swamps rivers

2

Terrestrial environments

Land environments
Deserts forests grasslands

3

Viscosity
- aquatic environment
- terrestrial environment

- more difficult for organisms to move through water
- easier for organisms to move through air

4

Temperature
- aquatic environment
- terrestrial environment

- water heats up more quickly then air
- vary far more than in air

5

Pressure
- aquatic environment
- terrestrial environment

- increases rapidly with depth
- decreases with height above sea level and fluctuates over time

6

Oxygen
- aquatic environment
- terrestrial environment

- deceases with depth/ altitude
- air contains about 20% oxygen

7

Water
- aquatic environment
- terrestrial environment

- osmotic effects of fresh and salt water are important to organisms
- water availability varies. Amount of and when rainfall falls affects plants

8

Distribution

Where

9

Abundance

How many

10

Abiotic factors that determine distribution and abundance

Amount of light
Temperature
Availability of water
Amount of and strength of wind/ rainfall
Altitude/ depth

11

Biotic factors that determine distribution and abundance

Availability of food
Competitors
Predators
Mates available

12

Photosynthesis + equation

Process by which plants use sunlight to make their own food and converts light every into chemical energy(glucose)
Carbon dioxide+water( chlorophyll, sunlight) glucose+oxygen

13

Respiration+ equation.

Process which provides energy to all cells through the intake of oxygen
Oxygen + glucose> carbon dioxide +water+ energy

14

Respiration 2 stages

1. Occurs in cytoplasm
Involves splitting the 6x carbon glucose into 2x3 carbon molecules
Releases 2 molecules of ATP(energy)

2. Occurs in mitochondria
Oxygen is used
Pyruvate completely broken down to CO2 & H2O
Slowly releases 36 molecules of ATP

15

Populations in an ecosystem may decline because:

Disease
Predication
Competition
Human activities

16

No. Of species in a population are affected by:

Size of ecosystem
No of predators
Time of year
Reproductive cycles
Competition between predators for prey
Diseases
Seasonal migrations

17

Allelopathy

Production by a plant of specific chemicals

18

Parasitism

Parasite obtains food from host and host usually is affected

19

Mutualism

Two organisms benefit

20

Commensalism

Benefits one species but other is not harmed

21

Decomposes role

To absorb nutrients from dead organisms or waste materials and return organic matter to the soil
Bactria, fungi

22

Adaption of an organism+ examples

Makes it well suited to its environment and lifestyle

Mangrove- control of water balance as some mangroves have salt glands on their leaves which secrete salt
Environmental factor- salinity

23

Consequences when species compete for resources

Chance of survival
Restricts abundance of all competitors
One will be more successful
Reduce the no of competitors

24

Human impact in ecosystem

Rapid alterations
Widespread change
Destructive of original environment
Destructive of inhabitants
- land clearing

25

Abiotic characteristics

Non- living
Rain, soil

26

Abundance estimate

Number of weeds in sample area/area of sample X total area

27

Population density

Abundance in sample area / area of sample

28

Population abundance

Number captured in original sampleX total no. Captured 2nd sample (all/) number tagged in 2nd sample