Please enable JavaScript.

Coggle requires JavaScript to display documents.

sampling techniques (sampling animals (pitfall traps - used to catch small…

- - - - link to coggle-downloads.s3.eu-west-1.amazonaws.com
  - - - deep enough so insects do not crawl out
      - covered with roof structure so trap does not fill with rainwater
- - - - gives density per square metre
- - - - frame containing a horizontal bar
      - long pins pushed into ground at set intervals
      - each species of plant the pin touches is recorded
    - - square frame divided into grid of equal sections
      - type and number of species within each section of quadrat is recorded
    - - study how presence and distribution of organisms across area of land varies - quadrats placed systematically along line or belt transect
  - - - total number of species calculated
- - - - organisms marked and released back to community
        
        time allowed for organisms to redistribute throughout habitat before another sample collected
        
        number of marked individuals compared with number of unmarked individuals in second sample
        
        population size estimated - greater number of marked individuals recaptured, the smaller the population
        
        species evenness calculated by comparing total number of each organism present
        
        community with even populations of plants and animals - high species evenness