Populations Understanding Populations Measuring Populations Human Population Growth.
Population Ecology. Population Essential Questions What factors influence populations in ecosystems?...
-
Upload
jack-bryan -
Category
Documents
-
view
223 -
download
0
Transcript of Population Ecology. Population Essential Questions What factors influence populations in ecosystems?...
![Page 1: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/1.jpg)
Population Ecology
![Page 2: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/2.jpg)
Population Essential Questions
What factors influence populations in ecosystems? How do human population dynamics affect the world we live in?
![Page 3: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/3.jpg)
What is a population?A group of the same species living in a
geographic area
Important Note: So a population is made up of individuals. But, multiple populations make up a community.
![Page 4: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/4.jpg)
Quantifying Population
• Three key features:– Population size– Population density– Population distribution
![Page 5: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/5.jpg)
Population Size
• Number of individuals in an region
![Page 6: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/6.jpg)
Population Density• Number of individuals within a population per
unit area
![Page 7: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/7.jpg)
![Page 8: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/8.jpg)
Population Distribution• The spatial arrangement of organisms within
an area
clumped
uniform
random
![Page 9: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/9.jpg)
Population Distribution
![Page 10: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/10.jpg)
![Page 11: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/11.jpg)
Unregulated populations increase by exponential growth
Quick Think: In this model, a population will get bigger and bigger forever! Do you think that is really possible?
![Page 12: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/12.jpg)
Logistic Growth Model
Carrying Capacity (K)
Quick Think: What are some things that may cause population growth to slow down?
![Page 13: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/13.jpg)
Limiting factors prevent endless population growth
• Limiting factors: physical, chemical, and biological characteristics of the environment that restrain population growth
• Limiting factors are also referred to as “environmental resistance”
• Carrying capacity: maximum population size that the environment can sustain
Quick Think: Is the carrying capacity the same for all populations? Why or why not?
![Page 14: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/14.jpg)
Examples of limiting factors
• Space• Sunlight• Availability of:– Food– Water– Mates and breeding sites– Shelter
• Temperature• Nutrients• Pollutants
![Page 15: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/15.jpg)
The influence of some factors depends on population density
Density-dependent factors
DiseaseCompetitionFinding matesParasites
Density-independent factors
TemperatureStormsHabitat DestructionDrought
![Page 16: Population Ecology. Population Essential Questions What factors influence populations in ecosystems? How do human population dynamics affect the world.](https://reader035.fdocuments.net/reader035/viewer/2022062409/5697bfc91a28abf838ca92a5/html5/thumbnails/16.jpg)
Reproductive strategies• Biotic potential – ability to produce offspring