Ecology Review

Biology EOC

Levels of Organization

PopulationsLogistic Growth - Limited Exponential Growth - Unlimited

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Carrying Capacity

Populations

Factors that cause increase

• Birth

• Immigration (moving

in)

Factors that cause decrease

• Death

• Emigration (moving

out)

Limits to Population Growth

Density Dependent

• Competition

• Predation

• Disease

Density Independent

• Severe weather

• Natural disasters

• Human activities –

habitat destruction

Symbiotic Relationships

• Both species benefit

Mutualism

• One species benefits and the other is neutral

Commensalism

• One species benefits and the other is harmed

Parasitism

Co

mm

un

ity

Fo

od

Web

Biomagnification

• Polychlorinated biphenyls (PCBs)

are an industrial waste product and

a carcinogen

• Banned in 1979 in the US

Ecosystems

Primary Succession

• Occurs on new land

• Ex – land created by volcano

• Pioneer species is the first species to inhabit

• Lichens

• Soil needs to be created

Secondary Succession

• Occurs after ecosystem is destroyed

• Ex – forest fire, clear cutting

• Soil is intact

• Faster than primary succession

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Biomes

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ak0.pinimg.com/736x/da/ac/9d/daac9daf257e8d3850f931274f3adc07.jpg

Aquatic Biomes

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Cycles of Matter

Carbon Cycle

Water Cycle

Phosphorous Cycle