Factors Affecting Populations

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Presentation transcript:

Factors Affecting Populations Notes

Natural Hazards Vocabulary

Natural Hazard A naturally occurring event that can be hazardous to the biotic parts of an environment, but can renew the abiotic parts of the environment Examples: Floods Landslides Wildfires

Floods When heavy rain or snow melt is not able to be absorbed by the ground or carried away by a waterway, causing the water to cover the surrounding area, which is normally dry land. Flash floods = bad, damage to property or loss of life. Regular river floods = good, renew nutrients to soil.

A mass of Earth that falls rapidly from higher to lower elevations Landslides A mass of Earth that falls rapidly from higher to lower elevations Often Caused By: Erosion Gravity Can be triggered Heavy Rain Earthquakes

Wildfires Large fires that spread rapidly, and are hard to put out. They are due to drought or dry conditions. Destroy habitat and property. Can be good to germinate some plants and allow new growth.

Population Density The number of individuals in a population that are in specific area. Example: if we all went into the closet it would be more densely populated there.

Population Size The total number of organisms in a population of a species. Example: 752 humans in our school.

Carrying Capacity The largest number of individuals of a species that an area can support. This classroom should only have 24 students. 6 tables x 4 at each table.

Emigration The moving or migration of organisms out of an area (exit) 3 students leave and go to Conway Middle.

Immigration The moving or migration of organisms into an area (import) 7 new students transfer from Loris or Whittemore Middle.

Birth Rate When individuals are born into a population, causing it to grow. Example: 37 babies were born today at Conway Medical Center.

Death Rate When individuals “leave” a population, causing it to decrease in numbers. Example: 25 people died peacefully in their sleep last night. They were really old!!

Limiting Factors Biotic and abiotic factors that limit the number of individuals in a population Examples: Predators,Climate Availability of: food, water, space, shelter

Abiotic and Biotic Factors Abiotic factors include: soil, air, water, rocks, temperature and sunlight. Biotic factors: plants, animals, and anything living or once living.