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The Life Cycle of Aquatic Insects
Most benthic macroinvertebrates found in a healthy, freshwater stream are aquatic insects. The insects are usually in their early stages of development. When they become adults they live on land.

 

Can you believe it?

When aquatic insects become adults they sometimes live on land. Sometimes these aquatic insects only live for a few hours after they leave the water! He was a good dragonfly

Drawing by Sarah

Have you ever heard the word metamorphosis? Metamorphosis is the change that insects make as they go from an egg to an adult. Most of them change their size, shape, and color.

Insects have three basic kinds of life cycles.

Torrie Visit the Master Bug Theater

Four - phase Life Cycle

Egg - larva-pupa-adult

Complete Metamorphosis

During the larval stages the wings of an insect develop inside in a complete metamorphosis. Insects in the larval stage look very different than the same insect as an adult. There is a pupal stage between larval and adult. The insect is not active during this stage.

Drawings by Jaylon

 

 

 

Three - phase Life Cycle

egg-nymph-adult

 

Incomplete Metamorphosis

During the larval stage the wings of an insect develop outside in a simple metamorphosis. This means you can see the wings. The name of the larval stage for insect of this type are called nymphs. They look a lot like the adult insects. There is not a pupal stage.

 

Egg - Smaller insect that looks like the adult - Adult

No Metamorphosis

Some insects do not go through metamorphosis at all. They hatch from eggs and look like adults, just smaller. They get bigger and shed their outer skin when they outgrow it. There is a new, larger skin underneath the old.

1. When most aquatic insects become adults they

continue to live in the water.

live on land.

2. When an aquatic insect is in the larvae stage it is called a

nymph.

egg.

 

Learn More

Macroinvertebrates as Indicators of Water Quality

Kid Fish

Insects: The Rulers of the Earth

Citations

About Aquatic Fish Food (Insects and other aquatic creatures). Retrieved February 2007 from http://www.kidfish.bc.ca/insects.htm .

Aquatic Insect Life Cycle. Retrieved March 2007 from http://www.usask.ca/biology/skabugs/lifecycle/insectlifecycle.html .

BugGuide. Retrieved March 2007 from http://bugguide.net/node/view/15740 .

Insects and metamorphosis. Insects: The Rulers of the Earth. Retrieved March 2007 from http://www.worldbook.com/features/insects/html/incomplete.html .

Some general information about North American aquatic insects. Retrieved November 2006 from http://www.bio.umass.edu/biology/conn.river/insects-general.html .

 

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