Populations

Question 1

Transect

Answer 1

Used to see if community changes.
Place tape measure along transect to be taken
Place quadrats at regular intervals along the line
Count organisms present/percentage cover in quadrats
Repeat at same point along transect

Question 2

Mark release recapture

Answer 2

Collect a sample
Mark organisms
Must not change survival chance
Release
Allow time to re-integrate with rest of population
Collect second sample
Count number of marked; animals

Question 3

Plant population

Answer 3

Grid placed in area to be sampled
Coordinates found using a random number generator
Place quadrat at coordinate
Count number of plants
Repeat
Multiply to give estimate for total field area;

Question 4

Succession

Answer 4

Change in community over time
Hostile environment colonised by pioneer species
Die, decompose and increase soild depth and mineral content
Change environment
New species colonise area
Pioneers outcompeted
Environment becomes less hostile
Increase in biodiversity
More niches and sources of food
Climax community