Do Now Think of all the things that make up a lake. Places like Takanassee and Franklin Lake. List all the parts of the lake’s ecosystem in your notebook. Are all the parts of the ecosystem living? Explain your answer.

Big Picture LS2.A: Interdependent Relationships in Ecosystems Similarly, predatory interactions may reduce the number of organisms or eliminate whole populations of organisms. Mutually beneficial interactions, in contrast, may become so interdependent that each organism requires the other for survival. Although the species involved in these competitive, predatory, and mutually beneficial interactions vary across ecosystems, the patterns of interactions of organisms with their environments, both living and nonliving, are shared. (MS-LS2-2)   LS2.B: Cycle of Matter and Energy Transfer in Ecosystems Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem. (MS-LS2-3)

Objectives: By analyzing models, students will distinguish between biotic and abiotic parts of an environment and how they affect ecosystems. Learning Target Today I will: Learn about the biotic and abiotic parts of an environment. So that I can: Apply those concepts to how ecosystems are arranged. I will know I got it if: I can name the levels in an ecosystem and label the biotic and abiotic parts. Agenda Today we will: Watch a video Teacher Presentation Group and individual work Exit ticket Vocabulary biotic abiotic ecology community ecosystem biosphere

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Studying the Web of Life Ecology is the study of the interactions of organisms with one another and with their environment. The Two Parts of the Environment All of the organisms that live together and interact with one another make up the biotic part of the environment. The abiotic part of the environment consists of the nonliving factors.

Studying the Web of Life, continued Organization in the Environment At first glance, the environment may seem disorganized. However, the environment can be arranged into different levels. The five levels of the environment are shown on the next slide.

Studying the Web of Life, continued Populations Each animal is a part of a population, or a group of individuals of the same species that live together. Communities A community consists of all of the populations of species that live and interact in an area.

Studying the Web of Life, continued Ecosystems An ecosystem is made up of a community of organisms and the abiotic environment of the community. The Biosphere The biosphere is the part of Earth where life exists. It extends from the deepest parts of the ocean to high in the air where plant spores drift.

Exit Ticket What do organisms in an ecosystem depend on for survival? What are biotic and abiotic factors? What are the levels of organization in the environment?