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3-26-18 Symbiotic Relationships

Explore the concept of symbiotic relationships in ecosystems. Learn about mutualism, parasitism, and commensalism and how different species interact to survive. Homework assignment included.

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3-26-18 Symbiotic Relationships

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  1. 3-26-18 Symbiotic Relationships

  2. Do Now: Take out the Key Concept Builder assignment from Friday. Match the vocabulary term to the definition below. 1. how a population would grow under perfect conditions 2. something that can restrict the growth of a population 3. the largest number of individuals of one species that an ecosystem can support over time • Biotic potential • Limiting factor • Carrying capacity

  3. Review: Key Concept Builder (page 33) 1. decrease 2. decrease 3. increase 4. decrease 5. increase 6. increase 7. Possible answer: Population density is the number of individuals in a certain amount of space. 8. Possible answer: The hallways have a high population density before classes begin. The principal’s office has a low population density.

  4. Review: Key Concept Builder (page 34) 1. factors that can limit the growth of a population 2. food, water, space, shelter 3. Possible answer: If there are not enough resources, some individuals cannot survive, which limits the population’s growth. 4. predation, competition, disease, parasitism 5. competition and predation

  5. Review: Key Concept Builder (page 34) 6. Biotic potential is the potential growth of a population if it could grow in perfect conditions with no limiting factors. 7. Carrying capacity is the largest number of individuals that can survive in an area over a long time. 8. No; Possible answer: Almost no population reaches its biotic potential because perfect conditions almost never exist. 9. Yes; Possible answer: Carrying capacity is based on the resources available and other limiting factors. 10. No; Possible answer: It is based on perfect conditions that do not exist and do not change. 11. Yes; Possible answer: It is based on limiting factors, which can change. If limiting factors change, carrying capacity changes.

  6. EQ: What are some examples of symbiotic relationships? Standard: SC.7.L.17.2 Lesson Objective: Students will be able to compare and contrast the relationships among organisms.

  7. Communities • All the populations in the same area interact as a community: all the populations that live together in the same place. • Comunidad: todas las poblaciones que vivenen un ecosistema al mismotiempo. • Some populations might compete with each other for resources and space.

  8. Symbiotic Relationships • Each population has different ways to stay alive and reproduce. • All of the populations in a community share a habitat: the place within an ecosystem where a population or organism lives. • Habitat: lugaren un ecosistemadonde vive un organismo

  9. Symbiotic Relationships • Niche:the way a species interacts with abiotic and biotic factors to obtain food, find shelter, and fulfill other needs. • Nicho: forma comounaespecieinteractua con losfactoresabioticos y bioticos para obteneralimento, encontrarrefugio y satisfacerotrasnecesidades. • Example: different species of birds have different adaptations that allows them to feed in different parts of a pond

  10. Symbiotic Relationships • Some organisms develop relationships with other organisms that help them survive. • A symbiotic relationshipis one in which two different species live together and interact closely over a long period of time. • Simbiosis: relacionestrecha a largo plazo entre dos especies que generalmente involucre intercambio de alimento o energia. • These relationships can be beneficial to both organisms, beneficial to one and harmful to the other, or beneficial to one and neutral to the other.

  11. Types of Symbiotic Relationships • Mutualism—two species in a community benefit from the relationship. • Example: bees & flowers • Bees benefit as they get nectar (food) • Flowers benefit as the bees spread theflower’s pollen.

  12. Types of Symbiotic Relationships • Parasitism—one species (the parasite) benefits while another (the host) is harmed. • Example: Mosquitoes & Host Organism • Mosquito benefits as they obtain blood (food) • Host organism is harmed as it loses blood.

  13. Types of Symbiotic Relationships • Commensalism—one species benefits and the other is neither helped nor harmed. • Example: The remora rides attached to sharks and other types of fish. • Theremora benefits by gaining a measure of protection, and it feeds off of the remains of the meals of the larger fish. • The larger fish is neither helped nor harmed.

  14. Video Summaries • Ecological Relationships, Amoeba Sisters: https://www.youtube.com/watch?v=rNjPI84sApQ • Ant/Acacia tree symbiosis: https://www.youtube.com/watch?v=Xm2qdxVVRm4 • More examples of symbiotic relationships: https://youtu.be/zSmL2F1t81Q?t=21s

  15. Work on Key Concept Builder – What are some examples of symbiotic relationships? • This will be your homework if not finished in class.

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