2.1d - Monitoring Populations Flashcards
What can give information about environmental qualities?
the presence, absence or abundance of indicator species, eg the presence of a pollutant
What can be used to monitor an ecosystem?
susceptible and favoured species
Absence or reduced population indicates…
a species is susceptible to some factor in their environment
Abundance or increased population indicates…
a species is favoured by the conditions
The procedure for the mark and recapture technique is a method for…
estimating population size using a formula
In the mark and recapture technique M is?
a sample of the population which is captured, marked with M and released
In the mark and recapture technique C is?
a second sample which is captured, after an interval of time
In the mark and recapture technique R is?
the individuals in the second sample which were recaptures
The mark and recapture equation is…
N=(MC)/R
The mark and recapture methods assumes that…
all individuals have an equal chance of capture, there is no immigration or emmigration and that individuals that are marked and released can mix fully and randomly with the total population
3 methods of tagging animals?
banding, tagging, surgical implantation, painting and hair clipping
Methods of marking and subsequently observing species must…
minimise the impact on the study species
