Population Ecology. Population All the organisms of a species that live in a an area at a certain...
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Transcript of Population Ecology. Population All the organisms of a species that live in a an area at a certain...
![Page 1: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/1.jpg)
Population Ecology
![Page 2: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/2.jpg)
Population
• All the organisms of a species that live in a an area at a certain time
• Populations change when –new members are added or –members leave or die
![Page 3: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/3.jpg)
Birth
• The main way new members are added.• Birth Rate – number of births in a certain
amount of time–Example: births per year
![Page 4: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/4.jpg)
Death
• Deaths are the main way members leave a population.
• Death rate = number of deaths in a certain amount of time Example: deaths per year
![Page 5: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/5.jpg)
Immigration
• Organisms move in from another environment
• Causes a population to increase
![Page 6: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/6.jpg)
Emigration
• Some organisms leave the environment to go somewhere else.
• Causes a population decrease
![Page 7: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/7.jpg)
Population Change
Immigration
Births Deaths
Emigration
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![Page 8: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/8.jpg)
Population Density
• Measurement of population per unit area or unit volumeExamples: Wolves per square km.
Bacteria per ml.
• If a population increases or decreases in a given area, population density also increases or decreases
![Page 9: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/9.jpg)
Calculate Population Density
• If Yellowstone National Park has 400 wolves and covers an area of 9000 square km., what is the population density of wolves in Yellowstone?
• _450 wolves = 0.05 wolves/km² 9000 km²
![Page 10: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/10.jpg)
Limiting Factors
• Any factor that limits the growth of a population in an ecosystem
• May be biotic or abiotic• Examples– Climate– Food– Water– Space– Shelter
![Page 11: Population Ecology. Population All the organisms of a species that live in a an area at a certain time Populations change when – new members are added.](https://reader036.fdocuments.net/reader036/viewer/2022072016/56649efc5503460f94c0f6ab/html5/thumbnails/11.jpg)
Carrying Capacity
• The maximum number of organisms that can survive in a particular ecosystem.
• When a population reaches its carrying capacity, it cannot grow any larger