determining a population size

Question 1

direct methods

Answer 1

• counting every single individual in a population

Question 2

census

Answer 2

• direct method
• populations large enough to see
• not too large of a population
• slow moving / stationary
• ## aerial photographs

Question 3

indirect methods

Answer 3

• using samples to estimate population sizes

Question 4

quadrat method

Answer 4

• indirect method
• uses a small measured area (quadrat)
• N = (no. in samp)(size of habitat) / size of quadrat
• should be distributed randomly

Question 5

mark-recapture

Answer 5

• samples are captured and marked, then released
• after some time they are recaptured and marker / remarked
• capture as many as possible
• P = (M x C) / R
• r (total number of marked in second sample)
• shortly, so no births can happen
• repeated
• no damage or change to function
• closed population