Bird poop helps keep coral reefs healthy, but rats are messing that up | Science News


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Bird poop helps keep coral reefs healthy, but rats are messing that up

Nitrogen from bird guano is linked to more productive reef ecosystems

1:02pm, July 11, 2018
booby chick

WILD WASTE  Nitrogen from the guano of seabirds, such as this red-footed booby chick, leaches into coral ecosystems and helps them stay robust.

When invasive rats chow down on island seabirds, coral reefs suffer.

Researchers studied islands with and without the rodents in the Chagos Archipelago in the Indian Ocean. On rat-free isles, there were on average 1,243 birds per hectare compared with about two birds per hectare on rat-infested islands, the team found. And these rodentless islands had healthier coral reef ecosystems. The secret: Bird poop, naturally rich in nitrogen, washes into the ocean and helps keep reefs productive, the scientists report in the July 12 Nature.

“We’re essentially linking three ecosystems in this study,” says study coauthor Nick Graham, an ecologist at Lancaster University in England. The rats affect the seabirds, which affect the reefs.

Introduced by humans to the Chagos Archipelago in the late 18th century, rats have since devastated native seabird populations, including red-footed

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