Bio Section 5-2 Limits to Growth – Flashcards
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What is a limiting factor?
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It is a factor that causes population growth to decrease
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A limiting nutrient is an example of what?
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Limiting Factor
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What is a density-dependent limiting factor?
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It is a limiting factor that depends on population size.
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When do density dependent factors become limiting?
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they become limiting only when the population density reaches a certain level.
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When do density dependent factors operate most strongly?
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They operate most strongly when a population is large and dense.
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What are four density-dependent limiting factors?
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Competition,predation,parasitism, disease
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When populations become crowded what do organisms compete with one another for?
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They compete for food water space some other essentials of life?
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The mechanism of population control in which a population is regulated by predation is called ___________?
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Predator-prey relationship
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What are the prey and what are the Predators in the predator prey relation on Isle Royale?
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The prey are moose and the predators are the wolves
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Why does the wolf population on Isle Royale decline following a decline in the moose population.
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It declined because the wolves eat all the moose and then there are no more moves to eat to the Wolves die.
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How are parasites like predators?
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Like predators parasites nourishment at the expense of their hosts and weakening them and causing disease or death
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A limiting factor that affects all populations in similar ways regardless of population size is called a ______________________.
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Density- Independent limiting factor.
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What are examples of density independent limiting factors?
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Natural disasters, cutting rainforest.
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True or false most population can adapt to a certain amount of change
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True
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True or false periodic drought can affect entire populations of grasses.
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True
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True/false populations never build up again after a crash in population size.
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false
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True or false major upsets in an economy can lead to long-term declines in certain populations.
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true
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What is the characteristic response in the population size of many species to a density-independent limiting factor?
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The population size characteristically crashes.
