"Curlews can't survive in the Central Valley without irrigated agriculture, given the loss of most of their historic shallow-water habitats in summer and fall," says Dave Shuford, Point Blue ecologist and lead author of the publication.
The Central Valley's protected wetlands (federal wildlife refuges, state wildlife areas, and private lands) and certain types of agriculture (e.g. rice, alfalfa), provide nearly all of the habitat used by millions of ducks, geese, shorebirds, and other waterbirds every fall, winter, and spring. In early fall—the driest time of year in the Valley—it is especially important that these birds can find flooded fields and wetlands for their survival. In the study, Point Blue scientists, Audubon California, and a host of volunteers studied the curlews for three years. Observers recorded over 20,000 curlews: about 93% were in the central and southern portions of the Central Valley, concentrating in areas extensively flood irrigated for alfalfa and irrigated pasture.
"Millions of migratory birds rely on the flooded agricultural fields each year. Conservation and agricultural groups can work together to benefit birds and people," says Meghan Hertel, Audubon Working Lands Director.
In the future, irrigated agriculture will face increased water costs driven by competing needs of an increasing human population and probably drier conditions under a changing climate. These threats might be offset if a program of economic incentives can be devised for farmers to maintain flooding of crops, such as alfalfa and irrigated pasture, to the benefit of both farmers and curlews.
Shuford, W. D., G. W. Page, G. M. Langham, and C. M. Hickey. 2013. The importance of agriculture to Long-billed Curlews in California's Central Valley in fall. Western Birds 44:196-205.
Provided by Point Blue Conservation Science
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