USA wading bird nesting in key area plummets 39 percent below 10-year average28/01/2013 22:46:04 Endangered Wood stork breeding failure
January 2013. One of the USA's largest and most important wading bird breeding areas - south Florida, which includes the Everglades National Park - has seen wading bird nesting plummet to levels 39 percent below ten-year averages, according to a new report by the South Florida Water Management District. This weather-induced decline bucks a trend dating to 1985 of growing bird populations in South Florida as a result of restoration of water flows in the Everglades, and reaffirms the need for speeding completion of the project.
3rd consecutive year of poor nesting
"These numbers are alarming because we are talking about extremely important bird breeding grounds on a national level and we're looking at three years of poor breeding success," said Kacy Ray, Beach Nesting Bird Conservation Officer for American Bird Conservancy, one of the nation's leading bird conservation organizations. "Restoring water flows in the Everglades will re-establish prey production and availability across the landscape that, in turn, will support the return of large successful wading bird colonies to the traditional rookeries downstream."
Wood stork, white ibis and snowy egrets worst affected
Wood stork - 100% nest failure
This contrasts with long-term trends showing population increases for Wood Storks, Snowy Egrets, Great Egrets, White Ibis, Small White Heron, Great Blue Heron, and Roseate Spoonbill. Wading bird breeding patterns in south Florida are driven largely by hydrology through its influence on the production of prey and their vulnerability to predation. The 2012 breeding season was preceded by several drought years followed by a relatively wet season. Such conditions generally limit the production of small fishes that the birds feed upon.
"To restore and manage for wading bird populations in the Everglades, the right amount of water at the right time and the right place is needed to optimize the availability of aquatic prey species (small fishes and crayfish). The long-term monitoring programs in this report (both avian and prey related) are critical to this end," said Mark Cook of the South Florida Water Management District. "We need to know what's happening, why it's happening and what's working if restoration efforts are to be targeted effectively. These programs have made considerable advancements in our knowledge of wading bird ecology in recent years, although much still remains to be learnt about getting the water right for the birds."