Lab 2: Estimating Population Sizes. Changes in population sizes are an indicator for important changes in community structure. Such changes may take years to become evident due to the long lifespan and slow reproduction in some seabird species.
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A group of individuals of the same species in a given area
Endangered/threatened species efforts
Monitor invasive species
Effects of pathogen
Understand impacts of different species on community structure
- Mark Recapture
Non mobile (mostly)
- Point Center Quarter (PCQ)
*Try to be consistent with first point as corner
Randomize start point (center)
Split to 4 Quadrants
Measure distance to nearest individual in each quadrant
Standard Error (SE):
SE = s / √n
Solving for N
N = nM
Why would failure to meet assumptions affect population estimate?
N = nM