When one tugs at a single thing in nature, they find it attached to the rest of the world
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- Navigate this page:
- Stop Think 6
- Situation Density-independent, or density-dependent Limiting Factor
- III. Carrying Capacity Growth Curves
| Stop and Think #5:
a) Pretend the graph on the previous page is the data you obtained after doing your own lab, and you are filling out the lab write-up form. You get to the part of the form where you have to fill out your results sentence. Using the data in the graph to guide you, fill out the results sentence below: As the number of lynx increases, the number of snowshoe hares: ________________________. b) Using what you know from the reading and from the graph, give a scientific explanation for the results sentence you completed above. A scientific explanation for these results is: One last density-dependent limiting factor that stops a population from growing is emigration. Emigration occurs when, as a population approaches carrying capacity, individual organisms from the population leave and go to a new area where they can find enough resources for survival and reproduction. This, obviously, will cause a decrease in the amount of organisms in a population. You may have heard of a word that has the exact opposite meaning and effect on population size—immigration. Stop & Think #6: a) Knowing that immigration is the opposite of emigration, what does immigration mean? b) Will immigration cause populations to increase or decrease in size? ___________________ c) Using Scappoose as an example, give an example of immigration and emigration’s effects on the population of humans in Scappoose. Read each situation in the chart below. Then, state if it is a density-independent limiting factor or a density-dependent limiting factor. Then, state the specific limiting factor that is occurring. The first one is done for you as an example.
III. Carrying Capacity Growth Curves  
Complete the following table for the two types of growth curves:
Directions: For each of the following scenarios circle whether the population growth would best be represented by a logistic or exponential growth curve. a. a strep bacterium invades your throat and reproduces for 4 hours exponential logistic b. the flea population on a rat is monitored for 5 weeks with flea powder added exponential logistic c. loggerhead turtle populations are tracked for 10 years in the Atlantic exponential logistic d. a lucky yeast cell falls into your glass of grape juice and reproduces for 3 hours exponential logistic e. bull frog population in a local pond is monitored for 5 seasons exponential logistic Population Ecology Graph Worksheet D  irections: Look at the graphs below and answer the following questions.
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