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    National Historical Park Alaska

Stream Ecology - The Other Players

Photogragh of midges

Midges in the larva stage.

True Flies (Diptera)

Midges (Chironomidae): mostly collector-gatherers. A very diverse group found in most aquatic habitats.

Illustration of blackfly larvae and adult

Blackflies in the adult and larvae life stages.

Blackflies (Simuliidae)

Filter-collectors. Larval blackflies have fans that they extend into the stream current. These fans can filter out particles as fine bacteria.

Illustration of larva and adult stages of a cranefly

Crane Flies in the larva and adult stages.

Crane Flies (Tipulidae)

Large shredders of leaf litter.

Illustrations of invertebrate groups

Flatworms (Turbellaria): Predators and collector-gatherers. They are sometime found on dead salmon.

Water Mites (Hydracarina): These are predators or parasites depending on life stage.

Aquatic Earthworms (Oligochaeta): Collector-gatherers.

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Did You Know?

Map of Alaska and the continental United States

With 570,374 square miles, Alaska is twice the size of Texas and 1/5 the size of the rest of the United States. It stretches 2,400 miles east-to-west and 1,420 miles north-to-south.