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ECOSYSTEMS

ECOSYSTEMS . CHAPTER 10. WHAT IS AN ECOSYSTEM?. An ecosystem is all the living things and nonliving things in a given area Examples of ecosystems: Forests, deserts, grasslands, rivers, beaches, and coral reefs. Abiotic Vs. Biotic Factors .

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ECOSYSTEMS

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  1. ECOSYSTEMS CHAPTER 10

  2. WHAT IS AN ECOSYSTEM? • An ecosystem is all the living things and nonliving things in a given area • Examples of ecosystems: • Forests, deserts, grasslands, rivers, beaches, and coral reefs

  3. Abiotic Vs. Biotic Factors • Abiotic factors: the nonliving parts of an ecosystem • Ex. Sunlight, temperature, air, water, soil • Biotic factors: the living OR once-living things in an ecosystem • Ex. Bacterium, dead organisms(fallen leaves), decayed plant matter in soil, people, animals, trees, etc

  4. Parts of an Ecosystem Habitat: the place within an ecosystem that provides food, water, shelter, and other biotic and abiotic factors that an organism needs to survive and reproduce Population: All the organisms of the samespecies that live in the same area at the same time Community: ALL of the populations living in the SAME area at the SAME time

  5. Too Many Fish in the Sea? • How can you determine if an area contains too much of something? You could calculate the population density! • Population Density: the size of a population compared to the amount of space available • POPULATION DENSITY: number of individuals unit area or volume of space

  6. Lesson 2 Relationships Within Ecosystems Niche: the way a species interacts with abiotic and biotic factors to obtain food, find shelter, and fulfill other needs Symbiosis: a close, long term relationship between two species that usually involves an exchange of food or energy

  7. Types of Symbiosis • Mutualism: when both organisms benefit • Ex. Fish and cleaner shrimp-fish get cleaned and cleaner shrimp get food  Commensalism: when one organism benefits but the other neither benefits nor is harmed Ex. Moss growing on a tree. Moss benefits because it has somewhere to grow. Parasitism: One organism benefits and the other is harmed Ex. Wasp lays eggs inside a caterpillar’s body. The eggs hatch and the larvae chew through the body and kill the caterpillar 

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