3-26-18 Symbiotic Relationships

Do Now: Take out the Key Concept Builder assignment from Friday 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

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.

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

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.

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.

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 viven en un ecosistema al mismo tiempo. Some populations might compete with each other for resources and space.

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: lugar en un ecosistema donde vive un organismo

Symbiotic Relationships Niche: the way a species interacts with abiotic and biotic factors to obtain food, find shelter, and fulfill other needs. Nicho: forma como una especie interactua con los factores abioticos y bioticos para obtener alimento, encontrar refugio y satisfacer otras necesidades. Example: different species of birds have different adaptations that allows them to feed in different parts of a pond

Symbiotic Relationships Some organisms develop relationships with other organisms that help them survive. A symbiotic relationship is one in which two different species live together and interact closely over a long period of time. Simbiosis: relacion estrecha 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.

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 the flower’s pollen.

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.

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. The remora 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.

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

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