1 / 7

Ch. 20.2 Population Ecology pp.383-387

Ch. 20.2 Population Ecology pp.383-387. Growth rate = birth rate – death rate ADD: Immigration = individuals move into the pop. Birth rate = SUBTRACT: Emigration = individuals move out of pop. Death rate =. Ch. 20.2 Population Ecology pp.383-387.

petra-ingram
Télécharger la présentation

Ch. 20.2 Population Ecology pp.383-387

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch. 20.2 Population Ecologypp.383-387 Growth rate = birth rate – death rate ADD: • Immigration = individuals move into the pop. • Birth rate = SUBTRACT: • Emigration = individuals move out of pop. • Death rate =

  2. Ch. 20.2 Population Ecologypp.383-387 Exponential growth = population is growing without limits • Common for bacteria, and in early growth • Sometimes called “doubling” • Cannot continue forever because soon goes to infinity • Resources always become limited

  3. Ch. 20.2 Population Ecologypp.383-387 Limiting factor = a resource that runs out and limits growth • Food, habitat,… Logistic growth = when a population grows to a maximum that the environment can support • Often starts exponentially but eventually reaches the limit

  4. Ch. 20.2 Population Ecologypp.383-387 Carrying capacity = number of individuals (capacity) that the environment can carry for a long period of time • Abbreviated K • Birth rate = death rate; or balanced How many days are the Paramecia below in exponential growth? The daphnia…?

  5. Ch. 20.2 Population Ecologypp.383-387 Density- independent limiting factors = limit growth but NOT related to population density • Weather, fire, pollution… • The limiting factor is independent of the size of the population

  6. Ch. 20.2 Population Ecologypp.383-387 density-dependent limiting factor = does depend on the size of the population in the area • Food, nesting sites, finding mates, diseases Inbreeding = loss of genetic diversity because of few individuals • Close relatives mating • Increase in genetic disease

  7. Ch. 20.2 Population Ecologypp.383-387 flux = populations fluctuate, or constantly increase or decrease • Common in predator- prey interactions • Lynx and Snowshoe hare

More Related