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SARANAC LAKE, N.Y. (AP) A new study finds the populations of some bird species are declining in lowland wetlands in the Adirondacks.

Data collected from 2007 to 2011 on the boreal chickadee, olive-sided flycatcher and rusty blackbird "showed high extinction probabilities in Adirondack wetlands," according to a Wildlife Conservation Society researcher's findings, recently published in the journal Northeastern Naturalist.

Adding data collected since 2011, researcher Michale Glennon found that the number of wetlands occupied by the rusty blackbird, gray jay, yellow-bellied flycatcher, olive-sided flycatcher and black-backed woodpecker had declined by 15 percent or more since 2007, the Adirondack Daily Enterprise (http://bit.ly/1jihmib ) reported Saturday.

Of the eight bird species Glennon surveyed, only the yellow palm warbler was growing in numbers. Another bird, the Lincoln's sparrow, saw its Adirondack wetland population swell from 2007 to 2011, but more recent data show a drop-off, the newspaper said.

Glennon has studied what are known as boreal birds since 2003. Besides playing an ecological role, the creatures are magnets for bird watchers. The Adirondack Park represents the birds' southern range in eastern North America.

"You don't find them once you get out of here" to the south, Glennon told the newspaper. "They're not in the Southern Tier. They're not in the Catskills."

She found the birds were much more likely to disappear from smaller, isolated wetlands that are near human development.

"None of these plots we are in are particularly close to development, but obviously, it's close enough to have some influence on them," Glennon said, noting that moose, spruce grouse and some other animals also live in the lowland wetlands and travel between them.

"If we can maintain some of the connections of those habitats and try to buffer those wetlands and keep disturbance out of them, I think that can help maintain this larger network of population," she said.

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Information from: Adirondack Daily Enterprise, http://www.adirondackdailyenterprise.com/