Kazi Sakiouzzaman
BIO 356
022308
Lab 3: Population Regulation
1.
Use the curve in Figure 1 below to calculate R, the growth rate, and the
population abundance in the next time step under the following two
scenarios: N(t) = 60 and N(t) = 400. Compare the growth rates at these two
different population sizes. What inferences can you draw about the biotic
conditions faced by these organisms at each of these two population sizes?
N(t) = 60
At the next time step, the ratio of N(t+1)/N(t) = 2.4
Thus N(t+1) = 60 x 2.4 =
144
Calculating R
R = N(t+1)/N(t)
R = 144/60 =
2.4
N(t) = 400
At the next time step, the ratio of N(t+1)/N(t) = 0.7
Thus N(t+1) = 400 x 0.7 =
280
R = 0.7
At the population of 60, the population may have had favorable biotic conditions
necessary for reproduction. This is including but not limited to: high supply of food,
favorable reproductive atmosphere, healthy offspring etc. At the population of 400,
signs of population overabundance seem to have taken place, as the population ratio
N(t+1)/N(t) steadily decreases. Since the ecosystem always has limited resources,
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 Fall '08
 GINZBURG
 Population Ecology, Kazi Sakiouzzaman

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