KA 1: field techniques for biologists: monitoring populations Flashcards
what can give info of environmental qualities, such a presence of a pollutant?
presence, absence or abundance of indicator species
what can be used to monitor an ecosystem?
susceptible and favoured species
what does the absence or reduced population indicate about a species?
-its susceptible to some factor in the environment
what does the abundance or increased population of a species indicate?
its favoured by the conditions
the formula for procedure for the mark and recapture technique as a method for estimating population size is:
N= MC/R
explain each letter in the N=MC/R formula
M=NO. in first capture
C= NO. in second capture
R= NO. marked in second recapture
N= population estimate
what does the method N=MC/R assume?
-all individuals have an equal chance of capture
-there is no immigration or emigration
-individuals that are marked and released can
mix fully and randomly with the total population
list methods of marking animals
-banding
-tagging
-surgical implantation
-painting
-hair clipping
the method of marking and subsequent observation must…
minimise the impact on the study species