Competitive Relationships and Predator and Prey
Presentation
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Science
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6th Grade
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Practice Problem
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Medium
+1
Standards-aligned
Michael McCrory
Used 162+ times
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14 Slides • 9 Questions
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Competitive Relationships
And Predator and Prey
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Competition
Competition is when two or more parties strive for a goal that cannot be shared. One gains and the others lose.
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Competition within a Population
Competition is often seen between members of the same population, even siblings.
Many organisms produce far more offspring than can survive in their environment.
These maple saplings will all compete for the same sunlight, water and space.
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Wolf Competition
Wolves compete for rank within their pack
Competition also happens between packs for territory, for example.
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Stressful Conditions
Sometimes competition among members of the same population occurs only during stressful conditions.
If the population is small, plenty of resources are available for each rabbit.
If the population increases competition occurs for all resources.
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Poll
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Competition between populations
Competition also happens between members of different species.
In the desert, many plants compete for water.
Sagebrush and creosote bushes make chemicals that poison any plant growing too close to them.
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Predator and Prey
Any animal that eats another animal is a predator.
An animal or organism taht is eaten by another is know as prey.
Plants are not known as prey, so herbivores are never known as predators.
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Competition Among Predators
In any given ecosystem, there are often many predators competing for a limited amount of prey.
If there is a small amout of prey, this can lead to agression between the different predators.
Of course, the opposite is also true.
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Predator-Prey Cycles
There is a close relationship between the population of predators and prey.
When the prey population increases, the predator population will increase in the coming years.
The increase in predators will cause the prey population to go down.
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Predator-Prey Cycles
The repeated pattern of change in population is calles a predator-prey cycle.
Notice at the end of the chart, how the moose population rises as the wolf population declines.
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Competition in a Community
Resources in an ecosystem might be limited, and organisms in that community might be forced to compete with each other.
This includes predators competing for prey or herbivores competing for plants.
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Multiple Select
What other factors, besides the moose population, could have affected the small rises in the wolf population at the beginning of the graph?
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Multiple Choice
How do foxes affect the bison?
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Multiple Select
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Multiple Select
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Do Predators Benefit Prey?
Usually a predator is harmful to prey.
But, predators keep the prey population small enough to have ample food available.
When enough food is available, the prey population is healthier.
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Multiple Select
Imagine a population of rabbits in the woods. What resources do they need?
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Multiple Select
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Multiple Select
Imagine a population of rabbits in the woods. What predators are they hunted by?
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Multiple Choice
Competitive Relationships
And Predator and Prey
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