This response could negatively affect their health, possibly making the animals more vulnerable to disease over the long term.
In several quiet rooms in a marine lab in southwest France, dozens of Pacific oysters sit in large glass tanks, quietly living their oyster lives. Each morning, the lights come up slowly, carefully mimicking the rising sun, but at night the rooms never fully darken. The dim glow simulates the light pollution that increasingly plagues many marine species—even in natural habitats.
In the recent study, Tran and his colleagues put four tanks of oysters in different rooms and exposed each to a different intensity of artificial light at night. The researchers compared the oysters’ responses with the responses of animals in a control tank that experienced complete nighttime darkness.
But exposure to artificial light at night caused the oysters in the other four tanks to stay open at inappropriate times, with activity peaking in the early evening. And while oysters have certain genes that typically turn “on” during the day and others that turn on at night, exposure to nighttime light eliminated the difference.
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