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Starfish and anemones in a cold water rocky community.Sea Anemone

Starfish and anemones in a cold water rocky community. Photo

Diversity on cold rocky reefs can also be very high.

Diversity on cold rocky reefs can also be very high. Photo

Demosponges and coralline algae on a permanent photo plot.Algae

Demosponges and coralline algae on a permanent photo plot. Photo

Elkhorn, Acropora palmata, coral towers above reef creating habitat an...

Elkhorn, Acropora palmata, coral towers above reef creating habitat and beach protection. Photo

Scientists study reefs for many reasons, economic and ecologic.

Scientists study reefs for many reasons, economic and ecologic. Photo

This temperate reef off North Carolina has hard corals and tropical fi...

This temperate reef off North Carolina has hard corals and tropical fish. Photo

Sponges, corals and many other attached species compete for space on t...

Sponges, corals and many other attached species compete for space on the reef. Photo

Like corals, glass sponges are also partly composed of calcareous mate...

Like corals, glass sponges are also partly composed of calcareous material. Photo

The diversity of fish and other reef organisms rival tropical rainfore...

The diversity of fish and other reef organisms rival tropical rainforests. Photo

Brain corals get their name from the folds and turns in the coral skel...

Brain corals get their name from the folds and turns in the coral skeleton. Photo

Staghorn corals have declined at Caribbean reefs in the past 20 years.

Staghorn corals have declined at Caribbean reefs in the past 20 years. Photo

Corals on the reef vary from large stony heads to whispy branches.

Corals on the reef vary from large stony heads to whispy branches. Photo

Reef fish use the reef for cover and food.

Reef fish use the reef for cover and food. Photo

Sponges are as important as corals for reef structure.

Sponges are as important as corals for reef structure. Photo

Corals throughout the Caribbean are bleaching (casting out their algae...Algae

Corals throughout the Caribbean are bleaching (casting out their algae). Photo

Penguins explore snow-dunes in AntarcticaPenguin

Penguins explore snow-dunes in Antarctica Photo

Gravel-cobble bottom off Maine coast is favored scallop ground.

Gravel-cobble bottom off Maine coast is favored scallop ground. Photo

Bacterial mats are common the seafloor where oxygen is low

Bacterial mats are common the seafloor where oxygen is low Photo

Small dead crab in hypoxic (no oxygen) sediments off Louisiana.

Small dead crab in hypoxic (no oxygen) sediments off Louisiana. Photo

Close up of worm tubes, sometimes the most prominent structures on san...

Close up of worm tubes, sometimes the most prominent structures on sandy bottom. Photo

Catalina Island off southern CA, former home of a NURP center.

Catalina Island off southern CA, former home of a NURP center. Photo

Mother and juvenile bottlenose dolphins head to the seafloorBottlenose Dolphin

Mother and juvenile bottlenose dolphins head to the seafloor Photo

California sea lions bask in the sun,California Sea Lion

California sea lions bask in the sun, Photo

Humpback whale is attracted to an ROV, or undersea robotHumpback Whale

Humpback whale is attracted to an ROV, or undersea robot Photo

Humpback whales migrate from near the poles to tropical watersHumpback Whale

Humpback whales migrate from near the poles to tropical waters Photo

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