Name:______________________________________Date:_______________

INTERPRETING ECOLOGICAL DATA

Graph 1: Rabbits Over Time

a. The graph shows a __________ growth curve.
b. The carrying capacity for rabbits is ______
c. During which month were the rabbits in exponential growth?

Graph 2: Average Toe Length

a. In 1800, about how many people surveyed had a 3 cm toe? ______
How many in 2000? _______
b. The data shows the ____________ selection has occurred?
c. In 2000, what is the average toe length? ______ What is the average toe length in 1800 _______

 Year Geese Trapped Number with Mark 1980 10 1 1981 15 1 1982 12 1 1983 8 0 1984 5 2 1985 10 1

Graph 3: Mexico and US

a. In Mexico, what percentage of the population is between 0-4 years of age? _______ In the US? ______
b. Which population is growing the fastest? ________
c. Which age group has the smallest number in both countries? _____

Chart 4: Trapping Geese

In order to estimate the population of geese in Northern Wisconsin, ecologists marked 10 geese and then released them back into the population. Over a 6 year period, geese were trapped and their numbers recorded.

a. Use the formula to calculate the estimated number of geese in the area studied? _____________
b. This technique is called ____________ & ______________
c. Supposing more of the geese found in the trap had the mark, would the estimated number of geese in the area be greater or lesser? _____

Chart 5: Mushroom Plots

Another ecologist uses a different method to estimate the number of mushrooms in a forest. She plots a 10x10 area and randomly chooses 5 spots, where she counts the number of mushrooms in the plots and records them on the grid.

a.Calculate the number of mushrooms in the forest based on the grid data: _________________
b. Thie technique is called _______________

 Year Snakes Mice born Mice died 1960 2 1000 200 1970 10 800 300 1980 30 400 500 1990 15 600 550 2000 14 620 600 2001 15 640 580

Chart 6: Snakes & Mice

The data shows populations of snake and mice found in an experimental field.

a. During which year was the mouse population at zero population growth? ______
b. What is the carrying capacity for snakes ? ______
c. What is the carrying capacity for mice? _____
d. What is the rate of growth (r) for mice during 1970? _____ During 1980? ______