Grade 5 | Science | Unit 3 - Concept 1 - Lesson 4 - Types of Aquatic Ecosystems

Описание: Welcome dear students!
• Water ecosystems are also called aquatic ecosystems.
• Aquatic ecosystems on Earth can be classified in different ways such as:
• Saltwater ecosystems.
• Freshwater ecosystems.
Saltwater ecosystems
• Oceans and seas are the largest saltwater ecosystems that cover large parts of Earth's surface.
• Saltwater (marine) ecosystems of oceans and seas include:
• Shallow areas.
• Deepest areas.
Shallow areas:
These areas contain coral reefs and intertidal zones.
Note
Intertidal zone is the area along the coast that disappears underwater at the high tide and appears at the low tide.
Deepest areas:
These areas are called abyssal zones which are very deep areas in oceans, so that sunlight cannot reach them.
• Saltwater lakes are examples of saltwater ecosystems, let's study some of them:
Saltwater lakes:
• Some lakes have salt water.
Examples of saltwater lakes:
• Lake Bardawil in Egypt.
• Lake Assal in Djibouti.
Lake Assal:
• It has a high concentration of natural salts, so it is too salty for fish and most aquatic animals to live in.
• Also, there are few plants that can grow in this area.
• There are many different types of bacteria live in Lake Assal.
Freshwater ecosystems
• Freshwater ecosystems include:
• Ponds and most lakes.
• Flowing water bodies.
Ponds and most lakes:
• In many ponds and lakes, the water is present all year.
• Some other ponds and lakes dry up in the hot summer months, so animals and plants that live there must adapt to the changes that happen in these ponds and lakes to survive.
Example of freshwater lakes:
• Lake Nasser in Egypt.
Flowing water bodies :
• They include rivers and streams
(streams are small bodies of flowing water).
• Water is always moving in the flowing water
bodies.
• Many different plants and animals live in flowing
water bodies.

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Mr. Raouf Ashraf