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View Resource A scleractinian coral of the genus Acropora, a taxa that is dominant in shallow coral reefs of the Indo-Pacific region and highly suspectible to bleac

The scleractinian coral genus Acropora is a competitively dominant species in shallow coral reefs of the Indo-Pacific. It is highly susceptible to bleaching, which is thought to be primarily caused...

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View Resource A sockeye salmon (Oncorhynchus nerka) in a small breeding stream in southwestern Alaska.

A sockeye salmon (Oncorhynchus nerka) in a small breeding stream in southwestern Alaska. Adult sockeye lay their eggs in the gravel of streams, rivers, or along the beaches of lakes in late summer...

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View Resource A southern torrent salamander (Rhyacotriton variegatus) in conifer forest habitat in the Pacific Northwest.

The southern torrent salamander (Rhyacotriton variegatus) inhabits small, cool, headwater streams and seeps in conifer-dominated forests, primarily in the Coast Ranges of Oregon and northern...

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View Resource A Tributary Enters the Stream

A tributary to the Turure River enters the main stream. The tributary (in the center of the photo) runs below the road cut. The main part of the stream (along the bottom of the photo) comes from an...

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View Resource A variegated meadowhawk dragonfly (Sympetrum corruptum) perches in a California rice field.

A variegated meadowhawk dragonfly (Sympetrum corruptum) perches in a California rice field. Rice fields are widespread agricultural ecosystems that provide habitat for many wetland species, such as...

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View Resource A Volvox colony from a freshwater lake in British Columbia, Canada.

A Volvox colony from a freshwater lake in British Columbia, Canada. Volvox is a genus of green algae that forms colonies of numerous cells. A recent survey of lakes in British Columbia found that...

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View Resource A wolf (Canis lupus) in the snow in Banff National Park, which was recolonized by wolves in the 1980s.

The Bow Valley in Banff National Park, Canada, was recolonized by wolves (Canis lupus) in the mid-1980s, although wolves did not establish themselves in areas near the growing town of Banff. This...

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View Resource Abandoned mine drainage stream in productive woods

abandoned mine drainage, Pennsylvania, anthracite mining

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View Resource Aerial view of forest fire in pine forest in the Everglades National Park.

Fire is a natural factor that maintains the pinelands and other natural communities in South Florida. The frequency of these fires is influenced by large-scale climate cycles, particularly El Nino...

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View Resource Aerial view of Lake Christina, MN (ca. early 1980s)

An aerial view of Lake Christina, MN, during turbid-state (ca. early 1980s). Pelican Lake (immediately downstream) is visible on lower right. The effects of turbid water discharging from Lake...

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