Download presentation
Presentation is loading. Please wait.
Published byBryan Wilkerson Modified over 9 years ago
1
Page 539-549 Chapter 18 Section 2 & 3
2
Identify the characteristics that describe populations. Examine the different types of relationships that occur among populations in a community. Determine the habitat and niches of a species in a community. Objectives for Section 2
3
Population Size Number of individuals in the population Difficult to measure Small populations that are made up of organisms that do not move are determined by counting the individuals. Usually individuals are too widespread or move around too much to be counted. Characteristics of Populations
4
What does this graph tell us?
5
Change in population size due to- Older mice die Mice are born Mice eaten by predators Some mice move away Is this a fast changing population size or slow? What happens if you observe Field Mice in a pasture for several months?
6
What have you noticed about the Pine Trees here in Kentucky over the last several years? Has this effect been fast or slow? How can Pine Tree population be effected more quickly? Forest Fire? Disease? Logging? Pine Trees in a Mature Forest
7
The number of individuals in a population that occupy a definite area Example: 100 mice live in an area of 1 square kilometer, the population density is 100 mice per square kilometer. Population Density
8
Population Density Map
9
How the organisms are arranged in a given area Can be: Evenly spaced Consistent distance between them Randomly spaced Wind or birds dispersing seeds Clumped together Resources such as food or living space are clumped Results when animals gather in groups or plants grow near each other in groups Population Spacing
10
11
What are the five limiting factors from the video below? http://www.youtube.com/watch?v=CuwrZUTeEqM Limiting Factors
12
Any abiotic or biotic factor that limits the number of individuals in a population A limiting factor can affect other populations in the community indirectly: Example: A drought might reduce the number of seed- producing plants in a forest clearing. Fewer plants means that food can become limiting factor for deer that eat the plants and for a bird population that feeds on the seeds of these plants. Food also could become a limiting factor for animals that feed on the birds. Limiting Factors
13
Lets go outside!!!! Limiting Factor Example
14
Get out worksheet: Key Terms Interactions of Living Things Bell Ringer 1-10-13
15
Open Book to Pages 541-543 Each group is responsible for the section they are assigned. Include Key Term Definition Explanation of the section must be presented to class, so they can put in their notes! Group Presentations
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.