define species evenness
comparison of number of individuals of each species in a community
define species richness
total number of different species in a habitat
give 5 ways of sampling organisms
pooter (sucks air containing insects into container via tube)
sweep net
pitfall trap
tree beating (shaking tree or bush so insects fall onto white sheet below)
kick sampling (kicking river bank and catching organisms in net)
what are the 4 types of sampling?
random, opportunistic (conveniently available organisms), stratfied (taking sample from subgroups of pop), systematic (different areas at reg intervals)