THE TWIN ISLANDS OF ALAFIA Bank were washing away. The state-designated bird sanctuary, whose sandy shores sit just above sea level in Florida’s Tampa Bay, offers a haven for more than 10,000 nesting pairs consisting of 17 different bird species, including Roseate Spoonbills and Reddish Egrets. But every year, some of the islets’ mangrove trees would topple as boat wakes, storms, and rising seas eroded the coast. In the 1980s, conservationists strapped thousands of donated tires together and placed them along the beach to stop waves from eating away at the shore, says Jeff Liechty, sanctuary manager with Audubon Florida. But the rubber barriers later broke apart.
So, in 2011, Audubon Florida, which leases and co-manages the site with The Mosaic Company and Port Tampa Bay, tried a different approach:…