Do now 1.Describe the ecosystem of Easter Island. 2.What are some factors that limited how many...
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Transcript of Do now 1.Describe the ecosystem of Easter Island. 2.What are some factors that limited how many...
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Do now
1. Describe the ecosystem of Easter Island.
2. What are some factors that limited how many people can live on Easter Island?
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Do NowWhat are three factors that might limit the growth of a population of lions on the savannah?
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Carrying capacity
• The maximum population size of a particular species that an environment can sustain stably
• (how many individuals of a population can live happily in a place)
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Example of carrying capacity
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Carrying capacity can be expressed as population density
Population density = population ÷ area
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Population growth is limited by:
Biotic factors – living things (plants, animals, bacteria)
Abiotic factors – non-living things (water, soil, sun)
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Population growth is limited by:• Availability of matter and energy (food if you’re an
animal, sunlight and nitrogen in the soil if you’re a plant). Also water.
• Size of the environment (do you have enough space)
• Presence of competing organisms (other organisms competing with you for matter and energy and space
• Presence of predators (eating you)
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Turn and talk – what factors limited population growth of humans on Easter Island?
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Some factors that limit growth depend on population density, some do not
• Density independent factors affect populations no matter how dense they are– Natural disasters– Temperature– Sunlight penetrance in the ocean– Human activities
• Density dependent factors only affect populations when they reach a certain density– Competition for resources– Disease and parasites– Crowding– stress
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When resources are abundant, populations grow exponentially
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When resources become limited, populations grow logistically
• Population growth stops at the carrying capacity
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Exit slip – no notes!
1. What are three factors that limit population growth?