Presentation on theme: "Chapter #30 Populations and Communities. Chapter 30.1 Notes Population is a group of living things of the same species that live in an area. Emigration."— Presentation transcript:
Chapter 30.1 Notes Population is a group of living things of the same species that live in an area. Emigration is when animals move out of an area (causes a decrease in population) Immigration is the movement of animals into an area (causes an increase in population) Limiting factor is any condition that keeps the size of a population from increasing. Examples lack of light, space, water, food.
Chapter 30.2 Notes Community is all the living things in an area that depend upon each other. Habitat is the place where a plant or animal lives. Niche is the job or role an organism has in its community.
Producers- green plants that make their own food. Consumers 1.Carnivore- secondary consumer that eat other animals. 2.Herbivore- primary consumers that eat only plants. 3.Omnivore- secondary consumer that eat both plants and animals.
Decomposers breakdown living things Examples molds, mushrooms, bacteria.
Chapter 30.3 Notes Food Chain is a pathway of energy and materials through a community.
Food Web is many food chains connected in a community.
Energy Pyramid is a diagram that shows energy loss in the food chain. The most energy available. The least amount of energy.
Chapter 30.4 Notes Symbiotic relationships- a long-term close relationship between two living organisms. Mutualism- is when both organisms benefit. They both benefit. The clownfish and the sea anemone help each other survive in the ocean. The clownfish, while being provided with food, cleans away fish and algae leftovers from the anemone. In addition, the sea anemones are given better water circulation because the clownfish fan their fins while swimming about.
Parasitism- is when one benefits and the other is harmed.
Commensalisms- is when one benefits and the other is not affected. Bird is benefiting because he is getting food (bugs)...the cow is really not affected.
Predator-prey relationship- one animal hunts and kills the prey.