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Technique 1: Sampling A technique called sampling is sometimes used to estimate population size. In this procedure, the organisims in a few small areas are counted and projected to the entire area. For instance, if a biologist countes 10 squirrels living in a 200 square foot area, she could predict that there are 100 squirrels living in a 2000 square foot area. 1. Sampling Technique A biologist collect 1 gallan of pond water and counted50 paramecium. Based on the sampling technique,how many paramecium could be found in the pondif the pond were 1,000 gallons? a. 50 paramecium b. 500 paramecium c. 5000 paramecium d. 50,000 paramecium Technique 2 - Mark and Recapture In this procedure, biologist use traps to capture the animals alive and mark them in some way. The animals are returned unharmed to their enviornment. Over a long time period, the animals from the population are continued to be trapped and data is taken on how many are captured with tags. A mathematical formula is then used to estimate population size. 2. Mark and Recapture Technique A biologist originally marked 40 butterflies in WilsonPark. Over a month long period -butterfly trapscaught 200 butterflies. Of those 200, 80 were foundto have tags. Based on this information, what is the estimated population size of the butterflies in WilsonPark? a. 400 b. 100 c. 8,000 d. 16,000 3. Ultimately, all of the energy in most food chains or food webs comes from: a. Producers b. Consumers c. Decomposers d. Scavengers 4. The producer in this food web is the: a. Arctic Char b. Polar Bear c. Phytoplankton Capelin 5. Wastes and dead organisims from this food chainwill be fed upon by a. tertiary consumers b. decomposers c. autotrophs d. herbivores |