Population Diversity and

Conservation

Lions, Lizards and Liza

I can define the term population I can compare and contrast exponential and

linear population growth I can predict how environmental factors affect

population growth I can explain how birth and death rates impact

population growth I can explain why biodiversity is important I can describe various threats to biodiversity I can describe how scientists conserve

biodiversity I can explain ways scientists use to protect

endangered species

Objectives-I Can Statements

Population-A group of organisms, all of the same species, that live in a specific area.

Scientists study changes in populations Number of Births vs. Deaths over a given time period

Population growth is controlled by the following factors: Food and Water Supplies Living Space Disease Predators

Populations

• Scientists can identify trends in population growth

• Exponential Growth-J shaped curve.

• Initial growth is slow because reproducing population is small

• Linear Growth-A steady straight line increase

Population Dynamics

Factors that limit population growth are:

Food

Disease

Predators

Lack of Space

•The area where the curve flattens out is the Carrying Capacity of the Environment or the number of organisms that an environment can support

Growth Limits

Increase in number of births-Exponential Growth. J shape

As the population grows, more organisms are using existing resources. Growth slows. Graph becomes S shape

If population rises above, more die than are born

In teams of 2 predict how rapidly bacteria can reproduce using the data supplied in the problem.1.Create a table to record your calculations of bacteria reproducing every 20 minutes for 1, 2 and 3 hours at ideal conditions of 26 degrees C and a carrying capacity of 20,ooo colonies. Graph your data. 2.What kind of graph did you get? What does the shape of the graph tell you about the growth of your bacterial colonies?3.Based on what you know Predict what environmental factors might affect bacterial population reproduction.4.Infer An elephant reproduces once every 4 to 6 years. Why are elephants not likely to be used in laboratory population studies?

Predictions-Problem S0lving Lab 4.1, p, 95

Time in minutes

Number of Organisms

0 2

20

40

1. What is a population?2. Compare and contrast

exponential and linear population growth

3. Why are food, water, living space and disease limiting factors of populations. Give an example of how one of the limiting factors above might impact a population of deer in winter.

4. Identify the areas of the population growth curve to the right.

What do you know?

A

B

C

D