Day 1 Chapter 4 The Organization of Life

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Day 1 Chapter 4 The Organization of Life Section 1: Ecosystems: Everything is Connected Day 1

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.

Levels of Ecological Organization Pick-up Figure 4, page 95

The Components of an Ecosystem In order to survive, ecosystems need five basic components: energy mineral/nutrients water oxygen 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 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.

What are Ecosystems? Ecosystems

Organisms Organisms are living things that can carry out life processes independently. You are an organism, as is an ant, and ivy plant, and each of the many bacteria living in your intestines. Every organism is a member of a species. Species are groups of organisms that are closely related can mate to produce fertile offspring.

Populations Members of a species may not all live in the same place. Field mice in Maine will not interact with field mice in Texas. However, each organism lives as part of a population. Populations are groups of organisms of the same species that live in a specific geographical area and interbreed. For example, all the field mice in a cornfield make up a population of field mice.

Populations An important characteristic of a population is that its members usually breed with one another rather than with members of other populations For example, bison will usually mate with another member of the same herd, just as other flowers in the same field will usually pollinate wildflowers.

Communities Communities are groups of various species that live in the same habitat and interact with each other. Every population is part of a community. The most obvious difference between communities is the types of species they have. Land communities are often dominated by a few species of plants. These plants then determine what other organisms can live in that community.

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. In fact, animals and plants usually cannot survive for long periods away from their natural habitat.

YouTube! Ecosystem Song