10 (1).ppt - Population Changes Is affected by an 1.Ecosystems carrying capacity 2 Organism's biotic potential is the maximum number of organisms that

10 (1).ppt - Population Changes Is affected by an...

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Population Changes
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Is affected by an: 1.Ecosystems carrying capacity 2. Organism's biotic potential
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is the maximum number of organisms that an ecosystem can hold (can be sustained by the resources over a period of time )
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It’s symbol is K It is labelled on a logistic growth curve
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Some populations fluctuate greatly, making it difficult to define the carrying capacity
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it is always changing …. as environmental conditions change
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Is the maximum number of offspring that a species could produce with unlimited resources. It is high for insects & small animals
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It is regulated by: birth potential capacity for survival breeding frequency length of reproductive life
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Are factors in the ecosystem that will reduce population size Examples are: Competition Refuges from predators Soil nutrients Water Nesting sites Environmental Resistance
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For plants: It can be a resource that is in short supply E.g. water
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For animals: It can be competition for resources It could be pollution It can be lack of plant growth in areas
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Limit a species growth Examples: Lack of resources Increased Predation Increased Disease Poor soil quality Weather Disasters
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