Competition in Ecology

This diagram shows the variety of organisms that live in different tide zones. Mussels are common organisms that compete for space in intertidal (middle) tide zones. If all of the mussels were removed from zone A, which organisms would likely compete for the space in Zone A?

• Periwinkle and Limpets

• Sea lettuce and Chiton

• Sea urchins and Hermit crabs

• Rock louse and Periwinkle

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Organism X feeds mainly on small fish, amphibians, and reptiles. With which organism is organism X most likely to compete?

• Great blue heron

• Mallard

• Pied-billed grebe

• Great egret

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Competition becomes more important as the number of individuals ______ or the availability of resources _________.

• increases, decreases

• increases, increases

• decreases, increases

• decreases, decreases

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___ is when living things struggle against one another to get resources – like food, water, space, mates, etc.

• competition

• cooperation

• predation

• symbiosis

___  the branch of science that studies how organisms interact with one another & with their environment.

• ecology

• geology

• astronomy

• chemistry

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a relationship that occurs when two or more organims of the same species need the same resource at the same time

• competition

• symbiosis

• predation

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Plants compete for air, water, ________ within ecosystems.

• space, and sound

• sunlight, and wind

• space, and sunlight

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What is the term for the interaction where two species compete for the same resources in an ecosystem?

• Mutualism

• Parasitism

• Competition

• Commensalism

Which of the following is an example of intraspecific competition?

• Two different species of birds competing for nesting sites

• Two male deer fighting for a mate

• A lion hunting a zebra

• A bee pollinating a flower

In a forest ecosystem, which of the following would most likely be a limiting resource leading to competition among trees?

• Sunlight

• Oxygen

• Carbon dioxide

• Nitrogen gas

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