C2 Experimental Design
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State sampling techniques that can be used to study populations of a species (4).
• capture/recapture • remote sensing/satellite tracking • line transects • quadrats
Describe the capture/recapture technique, and what is is useful for.
WHAT - a number of organisms captured from a pop, marked, and released back to wild - another group is caught at a later date - Lincoln’s index used to estimate the population size (abundance = no. caught in first capture x no. caught in second capture, divided by the no. of marked organisms in second capture) WHEN - for mobile populations that cannot be easily counted Assumptions are made: - animals have the same probability of being captured both times, regardless whether they were caught 1st time - pop size did not change significantly in the time between captures - the marked animals mixed with the rest of the pop before the 2nd recapture
Describe remote sensing and satellite tracking, and what they are useful for.
Remote sensing - uses pulses of radio waves to map ground cover, land changes, and other features like glacier flow - used when areas are inaccessible or too large to obtain info in another way Satellite tracking - organisms with tags send electronic signals to satellites, which shows their exact location - useful for finding migration patterns/key areas for species under threat, that once identified, can be protected