![Page 1: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/1.jpg)
Populations
![Page 2: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/2.jpg)
As you may recall….
Populations - the # of individuals of 1 species living in the same ecosystem
![Page 3: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/3.jpg)
Many populations in nature find a point of balance.
The number of individuals a community can hold is called the Carrying Capacity
![Page 4: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/4.jpg)
Populations Change Naturally
Four factors that determine population size:
(i) Natality (# of births / year)
![Page 5: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/5.jpg)
Populations Change Naturally
Four factors that determine population size:
(ii) Mortality (# deaths / year)
![Page 6: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/6.jpg)
Populations Change NaturallyFour factors that determine population
size: (iii) Immigration (# of individuals moving
into an area)
![Page 7: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/7.jpg)
Populations Change Naturally
Four factors that determine population size:
(iv) Emigration (# of individuals moving away from an area)
![Page 8: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/8.jpg)
Populations Change Naturally
•In open ecosystems, all 4 factors affect populations
Population Growth = Births + Immigration - Deaths - Emigration
![Page 9: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/9.jpg)
![Page 10: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/10.jpg)
Abiotic factors Affecting Populations• Every species is able to survive in a range of tolerance in the environment. Populations are largest when conditions are optimal. (usually in a midpoint between an upper and lower limits)
eg. Daphnia live in a temperature range 10°C - 45°C
![Page 11: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/11.jpg)
![Page 12: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/12.jpg)
Key Terrestrial Ecosystem Factors • light availability • water availability • nutrients availability • temperature availability
![Page 13: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/13.jpg)
Key Aquatic Ecosystem Factors • light availability • nutrients availability • temperature availability • salinity • acidity
![Page 14: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/14.jpg)
Biotic factors Affecting Populations• Given optimal abiotic factors, biotic factors will determine a species success
eg. Daphnia provide food to many species
![Page 15: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/15.jpg)
![Page 16: Populations - Science to a Tee · size: (iii) Immigration (# of individuals moving into an area) Populations Change Naturally Four factors that determine population size: (iv) Emigration](https://reader034.vdocuments.us/reader034/viewer/2022042104/5e8289370d226b2450626ac3/html5/thumbnails/16.jpg)
Key Biotic factors • Predation/Parasitism • competition • Commensalism • Mutualism