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If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. 1. Introduce vocabulary terms related to ecological interactions and symbiosis. Explain that in this activity students will use a series of videos, images, and scenarios to identify and discuss examples of ecological and symbiotic relationships in the ocean. Write the following terms on the board: competition, predation, symbiosis, mutualism, commensalism, and parasitism. Do not include the definitions yet. First, ask students to identify the root words and brainstorm what types of ecological and symbiotic relationships the terms describe. Then, review the definitions of the terms. Point out that the term symbiosis is an overarching term for mutualism, commensalism, and parasitism and that the ecological relationships predation and competition are not generally considered to be symbiotic.
2. Build background about National Geographic Crittercam. 3. Have students use a Crittercam video to identify ecological
relationships. 4. Have students view videos to identify symbiotic relationships.
Ask: What type of symbiotic relationship was not shown in the videos? (commensalism) 5. Use a National Geographic image to explore commensalism and
discuss the origins of Crittercam. 6. Have students read statements and identify types of ecological interactions. Informal AssessmentUse the provided answer key to check students' completed worksheet for accuracy. Ask students to orally explain why they labeled each mutualism, commensalism, or parasitism. Extending the LearningHave students identify one new marine-related example for each of the ecological relationships discussed in this activity: predation, competition, mutualism, commensalism, and parasitism. Discuss the examples as a class. Subjects & Disciplines
Learning ObjectivesStudents will:
Teaching Approach
Teaching Methods
Skills SummaryThis activity targets the following skills:
Connections to National Standards, Principles, and PracticesNational Geography Standards
National Science Education Standards
Ocean Literacy Essential Principles and Fundamental Concepts
What You’ll Need
Materials You Provide
Required Technology
Physical Space
Grouping
Other NotesBefore starting the activity, download and queue up all of the videos. Background InformationSymbiosis is an ecological relationship between two species that live in close proximity to each other. Organisms in symbiotic relationships have evolved to exploit a unique niche that another organism provides. These relationships are based on the advantages that can be gained by finding and using a previously unexploited niche. Competition and predation are ecological relationships but are not symbiotic. Predation does not occur over a long period of time, and competition is an indirect interaction over resources. Vocabularycommensalism Noun relationship between organisms where one organism benefits from the association while not harming the other. mutualism Noun relationship between organisms of different species, in which both organisms benefit from the association. parasitism Noun relationship between organisms where one organism (a parasite) lives or feeds on the other, usually causing harm. predator Noun animal that hunts other animals for food. prey Noun animal that is hunted and eaten by other animals. symbiosis Noun two or more distinct organisms living together for the benefit of one or both. Websites
What type of interaction is shown when one organism benefits while the other is harmed?Parasitism is the type of interaction where one species benefit from the interaction, whereas the other species is affected negatively by the interaction.
Is an interaction where one organism is benefited while the other one is harmed?Parasitism is a symbiotic relationship in which one species (the parasite) benefits while the other species (the host) is harmed.
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