Important in evaluating the health of ecosystem Is organism threatened or endangeredneed protection Wolves Overrunning habitat Should Population be thinned Deer Count Individuals Best for stationary organisms ID: 783906
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Slide1
Estimating Population size
Important in evaluating the health of ecosystem:
Is organism threatened or endangered….need protection? Wolves
Over-running habitat….
Should Population be thinned ? Deer
Slide2Count Individuals
Best for stationary organisms
Slide3Slide4Yosemite Transect
Slide5transect
Slide6Clumped distribution
Slide7Estimating population size by genotyping feces
Slide8Remote Cameras
Slide9Radio collars/ tracking devices
Slide10Slide11Mark and capture Method
Slide12Population Estimation
Basic Sampling Techniques
https://
www.youtube.com/watch?v=7nr9rQpm2A4
https://www.youtube.com/watch?v=7nr9rQpm2A4
Tracking Snakes
https://
www.youtube.com/watch?v=5DR50IgvE7g
Mark and recapture bees
https://
www.youtube.com/watch?v=lKyj7gEAAS8
Slide13Slide14Lincoln Index
ratio
P
N
2
Entire Pop size recapture sample size
N
1
R # marked # marked in recapture
P
= (N
1
x N
2
)
R
P = total size of population
N
1
= size of first sample (you will mark all & release)
N
2
= size of second & subsequent samples (recapture: some will
be
marked, some won’t)
R = number of marked individuals recaptured in second sample
=
=
Slide15Estimating Population Size
MATERIALS:
50 beans, marking pen, plastic container with lid
PROCEDURE:
Mark 20 of the beans with the marker.
Place all 50 beans in the container and cover with the lid. Gently shake the container to mix the beans thoroughly. Take the lid off and
without looking
, withdraw 10 beans. Count the number of marked beans (R) and record in the data table.
Put the 10 beans back in the container and replace the lid. Shake the container again and withdraw a second set of beans. Again, record the number of marked beans in the sample in the data table. Continue in this manner until you have completed 10 trials.
Calculate the estimated population size for each trial using the Lincoln Index. When you have done this for all 10 trials, find the average by adding the estimates and dividing by 10.