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AP Biology

Community Ecology

AP Biology

Community Ecology Community

all the organisms that live together in a place interactions

Community Ecology study of

interactions among all populations in a common environment

To answer:In what way do these populations interact?

To answer:In what way do these populations interact?

AP Biology Fundamentalniches

RealizednichesHigh tide

Low tide

Species 1

Species 2

Niche & Habitat ECOLOGICAL NICHE~ the sum total of an organism’s

use of biotic and abiotic resources in its environment; its “ecological role”

Chthamalus sp.

Semibalanus sp.

Habitat- is an area

where an organism

lives.

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Interspecific interactions Community interactions

parasitism (-/+) commensalism (+/0)

barnacles attached to whale

mutualism (+/+) Water buffalo and Egret

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Parasitism In a parasitic relationship, one

organism benefits (parasite) while the other organism is harmed (host)

Examples-fleas, ticks, tapeworm, mosquito

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Commensalism In commensalism, one organism

benefits, while the other is not affected Examples – spanish moss growing on

trees, or barnacles growing on whales commensalism example

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Mutualism In a mutualistic relationship, BOTH

organisms benefit Examples – lichen (algae and fungus),

pollinators (insects, bats, birds, etc) Mutualism video

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Symbiotic Interactions Symbiosis is a close ecological relationship

between the individuals of two (or more) different species.

Types of Symbiosis

Description

Commensalism Relationship in which one organism benefits, but the other in neither helped nor harmed

Parasitism Relationship in which one organism benefits and the other is harmed in some way

Mutualism Relationship in which both organisms benefit

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commensalism

Parasitism

Symbiosismutualism +/+

+/-

Commensalism +/0

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What relationship is this?

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Activity – Community Interactions Groups of three

Answer the questions Symbiotic interactions include:

CommensalismMutualismParasitism

Be prepared to share15 minutes

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RECAP!! I will give you three separate

answers and you must give me a QUESTION that fits the answer.• A close ecological relationship between the individuals of two (or more) different species.

•A mosquito biting into a human’s arm

•Relationship in which one organism benefits, but the other is neither helped nor harmed