population diversity and conservation lions, lizards and liza
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Population Diversity and
Conservation
Lions, Lizards and Liza
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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
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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
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• 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
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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
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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
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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