Section 1 Ecosystems: Everything is Connected

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Presentation transcript:

Section 1 Ecosystems: Everything is Connected Chapter 4 Objectives Distinguish between the biotic and abiotic factors in an ecosystem. Describe how a population differs from a species. Explain how habitats are important for organisms.

Chapter 4 Defining an Ecosystem Section 1 Ecosystems: Everything is Connected Chapter 4 Defining an Ecosystem Ecosystems are communities of organisms and their abiotic environment. Examples are an oak forest or a coral reef. Ecosystems do not have clear boundaries. Things move from one ecosystem to another. Pollen can blow from a forest into a field, soil can wash from a mountain into a lake, and birds migrate from state to state.

The Components of an Ecosystem Section 1 Ecosystems: Everything is Connected Chapter 4 The Components of an Ecosystem In order to survive, ecosystems need five basic components: energy, mineral nutrients, water, oxygen, and living organisms. Plants and rocks are components of the land ecosystems, while most of the energy of an ecosystem comes from the sun. If one part of the ecosystem is destroyed or changes, the entire system will be affected.

Biotic and Abiotic Factors Section 1 Ecosystems: Everything is Connected Chapter 4 Biotic and Abiotic Factors Biotic factors are environmental factors that are associated with or results from the activities of living organisms which includes plants, animals, dead organisms, and the waste products of organisms. Abiotic factors are environmental factors that are not associated with the activities of living organisms which includes air, water, rocks, and temperature. Scientists can organize these living and nonliving things into various levels.

Levels of Ecological Organization Section 1 Ecosystems: Everything is Connected Chapter 4 Levels of Ecological Organization Pick-up Figure 4, page 95

Chapter 4 Habitat Habitats are places where an organism usually lives. Section 1 Ecosystems: Everything is Connected Chapter 4 Habitat Habitats are places where an organism usually lives. Every habitat has specific characteristics that the organisms that live there need to survive. If any of these factors change, the habitat changes. Organisms tend to be very well suited to their natural habitats. If fact, animals and plants usually cannot survive for long periods of time away from their natural habitat.