Florida’s Wading Birds Are Nesting In Droves This Year
An extra-wet rainy season shows that, given a chance, the Everglades ecosystem can bounce back from a century of abuse.
In the cypress woods of 爆料公社's Corkscrew Swamp Sanctuary, the ponds seemed to be boiling. It was a devilishly hot April day in the western Everglades, but it wasn鈥檛 heat roiling the water鈥攊t was fish: juvenile bowfin, catfish, and other freshwater species trapped in shrinking seasonal pools.
A who鈥檚 who of wading birds had descended on the banquet from nearby nest-laden trees. Great Egrets, Great Blue Herons, and Tricolored Herons stalked and stabbed. Roseate Spoonbills swung their beaks like metal detectors through the muck. White Ibises probed methodically, while Wood Storks line-danced through the shallows, bills ajar, snapping them shut when they bumped a morsel.
It鈥檚 a scene that played out across South Florida this spring, when abundant water created ideal breeding conditions. From coastal mangroves to tree islands in inland marshes, forest canopies dripped with pink and ivory as wading birds nested in some of the biggest numbers in recent memory. It鈥檚 too early for a final tally, but this year is poised to far surpass a, when more than 46,000 nests of seven wading bird species were recorded.
Biologists have taken to the air, land, and water to search for nests in the Everglades Protection Area, which includes Everglades National Park and conservation areas to the north. Surveyors have counted 3,141 Wood Stork nests, more than double the 10-year average, and some 8,000 Great Egret nests, about 25 percent above average. White Ibises were breeding in droves, with 34,400 nests tallied, 50 percent more than usual. At one ibis rookery called Alley North, up to 18,000 pairs congregated, a possible record for the site. Viewed from a Cessna circling at 1,000 feet, ibises appeared as white sprinkles among the broccoli-colored willows; for miles around the colony, they clustered in pools dotting the sawgrass prairie, filling up on fish and crabs before winging it home.
The Everglades are North America鈥檚 most important breeding area for wading birds, which have nearly 90 percent in the region since the early 20th century. As massive efforts continue to restore the hydrology of this iconic ecosystem, experts are hopeful this year鈥檚 resurgence of long-limbed waders proves that they have the resiliency to bounce back.
鈥淓verything is not lost,鈥 says Mark Cook, an avian ecologist with the South Florida Water Management District who edits an annual wading-bird nesting . 鈥淲e can still restore the system,鈥 he says. 鈥淭his shows how rapidly things can change when we get the water right.鈥
Last year South Florida experienced its in more than eight decades, from biblical downpours in June through Hurricane Irma鈥檚 ire in September. Flooding damaged homes and property, but the soggy summer had an upside: It recharged shallow wetlands, mimicking historical habitat conditions that supported vast flocks of wading birds.
Over the past century humans have drained half of the Everglades鈥 original 4,000-plus square miles for development and agriculture. The wide, shallow river that flowed south from Lake Okeechobee into today鈥檚 Everglades National Park and out to Florida Bay has been heavily engineered with canals, pumps, and dikes that divert water east and west. Drainage projects made room for farms and homes, but they also strangled the flow of water into the Everglades, robbing wading birds of wetland habitat鈥攁nd, as a result, food sources.
For millennia in the Everglades rain-fed south-flowing water filled up wetlands, which swelled with juvenile fish and crayfish. As water levels receded during the dry season, prey became stranded in shallow ponds. While that fish-in-a-barrel concentration isn鈥檛 so important for Great Egrets and other birds that hunt by sight, spoonbills, storks, and ibises find food by probing the shallows with their bills. They rely on these prey-dense pockets to feed their young and teach them to forage.
Today many shallow wetlands never fill up, forcing waders to breed elsewhere, or to wait until deeper pools retreat enough to make foraging possible, which can result in late-fledging chicks that are less likely to survive. Or wetlands may dry up too fast, leaving nestlings vulnerable to raccoons that alligator-filled waters would otherwise keep at bay.
Last summer鈥檚 heavy rains, followed by the gradual draw-down during the dry season, created ideal nesting conditions echoing the past. The flush of fresh water also helped dilute salinity and jumpstart prey-fish production in Florida Bay, the Everglades-fed estuary that lies between the mainland and the Florida Keys. Up to 400 pairs of Roseate Spoonbills nested there beginning in November鈥攎onths earlier than in recent years and in line with their traditional breeding schedule, says Jerry Lorenz, 鈥檚 director of research.
The striking birds also resumed nesting on mangrove islands, bucking their trend of colonizing inland areas to avoid salty, rising seas driven by climate change. 鈥淲hen your bill is nine inches long and you have six inches of sea-level rise, you don鈥檛 have any place to forage,鈥 Lorenz says. Ocean currents, which slightly lowered local sea levels, appear to have provided a temporary reprieve this year, he says.
Rising waters may eventually put those islands off-limits for spoonbills, but that鈥檚 not what started their decline. 鈥淚t was the lack of freshwater flow from the Everglades into Florida Bay,鈥 Lorenz says, and only by replenishing that flow can we offset the saline ocean water entering the bay. 鈥淚t鈥檚 imperative that we restore the Everglades to counteract sea-level rise, to keep that salt out.鈥
Restoring the Everglades will require far more than a single spectacular rainy season. A $state and federal restoration program encompassing 18,000 square miles has begun to undo a century of damage, and to increase water flowing south are slated for the next few years. These efforts to replenish wetlands and restore hydrology patterns, experts say, could reset the historical timing of nesting and see the boom of 2018 become the new normal.
鈥淎 restored Everglades means a resilient South Florida,鈥 says Celeste De Palma, 爆料公社 Florida鈥檚 Everglades policy director. 鈥淎 restored system would lead to getting the water right to support the thousands of wading birds that characterized the Everglades. That鈥檚 why we need to ensure restoration efforts don鈥檛 lag behind.鈥
Eighteen years into what was expected to be a 30-year effort, the work is nowhere near half done. Underfunding, political bickering, and sluggish bureaucracy have left many Floridians frustrated with the pace of restoration. But projects at last nearing completion will soon open the floodgates and begin fulfilling the effort鈥檚 promise. 鈥淚t鈥檚 slower than we would have hoped,鈥 De Palma says, 鈥渂ut I know we鈥檙e going to build momentum with all of these ribbon cuttings we foresee over the next five years.鈥
Renewing the flow of water will not only boost numbers in current breeding areas, it could also draw more waders back to traditional sites. A century ago early 爆料公社 leader Thomas Gilbert Pearson reported seeing 100,000 Wood Storks in the shallow wetlands at, historically home to North America鈥檚 largest colony. Since then, an estimated 80 percent of the wetlands have been drained or filled, and in most of the past 10 years none of the federally threatened birds have nested at Corkscrew. Instead they鈥檝e opted for marshes and managed wetlands in Georgia and South Carolina.
Downpours last summer, the rainiest on record at Corkscrew, replenished the shallow wetlands, luring the birds back. Most of the 400 nests counted since December held two or three chicks, and sanctuary director Jason Lauritsen says that about half are expected to fledge. 鈥淚t鈥檚 so uplifting to see them,鈥 he says. 鈥淭his year is exceptionally exciting. It shows that if conditions are right, they will nest, and nest successfully.鈥
Lauritsen says weather alone won鈥檛 ensure the storks鈥 return. It鈥檚 essential to preserve wetlands that act as natural flood-controlling sponges鈥攅specially shallow wetlands where waders forage early in the nesting season. Despite Everglades restoration efforts, the Big Cypress Swamp watershed, which includes Corkscrew, lost more than 43 square miles of wetlands to agriculture and development from 1996 to 2010, .
To help counter that trend, Lauritsen鈥檚 team is actively restoring hundreds of acres where storks have again started to forage, and they鈥檙e hoping to partner with the state to acquire and manage thousands of additional acres. These efforts complement the broader Everglades restoration plan鈥檚 focus on replenishing wetlands. The , for example, will rehab more than 50,000 acres not far from the sanctuary. 鈥淲e need to do our part and govern, restore, and manage accordingly,鈥 says Lauritsen. 鈥淭he birds will respond.鈥
Clamorous fluffballs that in April were just beginning to resemble storks, spoonbills, and ibises have since ventured out of their nests. They鈥檙e learning to forage for themselves in wetlands where they may one day return to gather food for their own chicks. Like their new Everglades home, they are full of promise.
Air support provided by Gary Lickle in collaboration with LightHawk.