Page 37 - Science Course 3 (Book 1)
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Evolving and Changing Ecosystems Mo1-L4a: How Do Land Ecosystems Change?
Lesson 4
Let’s Begin
In this topic, you will learn the following
lessons: How Land Ecosystems Change
Ecological succession is the process of one ecological
Mo.1–L4a: How Do Land Ecosystems Change? community gradually changing into another.
Mo.1–L4b: How Do Aquatic Ecosystems Change?
Climax
Pioneer Species Intermediate Community
Species
Mo1-L4a How Do Land Ecosystems Change?
KEY CONCEPTS:
1. How do land ecosystems change over time?
2. What is a climax community?
Vocabulary A-Z Hundred Years
Let us learn some vocabulary Bare rock Lichens Small Grasses Grasses, Shade-
annual and and shrubs, tolerant
lichens perennials and shade trees such
-intolerate as oak
trees such and
Ecological Succession as pines hickory
the process of one ecological The final stage of ecological succession in a land
community gradually ecosystem is a climax community - a stable
changing into another. community that no longer goes
through major ecological
changes.
Annual Perennial Shrubs Softwood Hardwood
Plants Plants and Tress- Trees
Grasses Pines
TIME
Climax Community
a stable community that no longer goes through
major ecological changes.
Grasses Aspen Black White spruce pioneer species
Lichen Herbs Shrubs spruce Jack Balsam fir Paper
mosses Tree seedlings pine birch the first species that
colonizes new or
Pioneer community Climax community undisturbed land.
TIME
29
