**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: 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 3: 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.

Year | Geese Trapped | Number with Mark |

1980 | 10 | 1 |

1981 | 15 | 1 |

1982 | 12 | 1 |

1983 | 8 | 0 |

1984 | 5 | 2 |

1985 | 10 | 1 |

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 4: 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 _______________

**Chart 5: Snakes & Mice**

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 |

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?
______

## More Resources on Ecology

Case Study – Loggerhead Turtles and Population Models – explore the number of eggs hatched and survivorship

Ecology Case Study – The Wolves of Isle Royale – population decline and reintroduction of wolves

Modeling Survivorship Curves with Bubbles – simulate survival patterns with this fun bubble activity

Predator Prey Graph – graph data on deer and wolf populations (growth curves)

Random Sampling – estimate a population of “sunflowers”