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A Northward March
Photograph by Peter Essick

Sloshing across an intertidal zone at the Hopkins Marine Station in Pacific Grove, California, biologist Chuck Baxter lays down a quadrat frame to count coastal plant and invertebrate species. Average annual water temperature has climbed at least 1.4°F (.8°C) here since the 1940s. Baxter's research has revealed that organisms like rock barnacles, gastropod mollusks, and tidal snails commonly found south of here have increased in abundance as the water has warmed. The bushy green Pacific sea anemone, shown in the foreground above, thrives in cool water and has decreased in abundance, an indication that it may be on the move to chillier zones up north.

Photo Fast Facts

Camera: Canon Rebel X
Film Type: Fujichrome Provia 100
Lens: 20mm
Speed and F-Stop: 1/60 @ f/8
Weather Conditions: Sunny
Time of Day: Morning
Lighting Techniques: Underwater housing with split filter


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