What can the American Dipper tell us about the #AnimasRiver? — The Durango Herald

The habitat of the American Dipper (Cinclus americana) is usually clear, rushing, boulder-strewn, mountain streams, within tall conifer forests. Photo via http://birdingisfun.com
The habitat of the American Dipper (Cinclus americana) is usually clear, rushing, boulder-strewn, mountain streams, within tall conifer forests. Photo via http://birdingisfun.com

From The Durango Herald (Jonathan Romeo):

It was John Muir’s favorite bird.

“He is the mountain streams’ own darling, the humming-bird of blooming waters, loving rocky ripple-slopes and sheets of foam as a bee loves flowers, as a lark loves sunshine and meadows,” he wrote in 1894.

On and off for 30 years, Muir, regarded as America’s most influential naturalist, noted the American Dipper in his explorations of Yosemite, and saw the bird as intrinsically tied with the life of the rivers.

“They scarce suggest any other origin than the streams themselves; and one might almost be pardoned in fancying they come direct from the living waters, like flowers from the ground.”

And now, more than 120 years later, a community reeling from a mine spill that has reinvigorated questions over the Animas River basin’s health will monitor the bird to gain a better understanding of the local watershed.

“I think the spill served to highlight we live in a really contaminated watershed,” said Kimberly Johnson, a volunteer with the American Dipper Project. “So a group of us bird aficionados got together to look at the river from a wildlife point of view.”

[…]

While the spill caused no immediate die-off of fish and other aquatic life, the heavy-metal laden sediment deposited in the river has raised concerns about the long-term health of aquatic species.

University of Saskatchewan biologist Christy Morrissey said the American Dipper – a bird she researched to earn her doctorate – is the “perfect indicator of water quality.”

“Basically, just the presence of dippers will indicate the suitability of the habitat. Then you can measure a lot of things, contaminate-wise, which are useful for understanding the effects of something like a mine spill.”

The American Dipper, a sooty gray bird with a tail that points upward, lives its entire life on a river, rarely straying more than a few meters from the fast-moving, cold water.

Weighing about 2 ounces, North America’s only aquatic songbird can dive and spend up to 30 seconds under water, upturning rocks for aquatic insects, such as stoneflies, mayflies and caddisflies, midges and even small fish.

Yet for how stalwart the bird is – it’s been noted to withstand negative 40-degree air temperatures in Montana – the avian diver is extremely vulnerable to instability in a river’s ecosystem.

Pete Marra, head of the Smithsonian Migratory Bird Center, said if a dipper’s food source begins to decline, the bird has been known to decrease in numbers along rivers, and in some cases, completely abandon waterways.

In a reverse situation, after a dam in Washington was removed, Marra said a flailing population of dippers almost immediately rebounded as salmon were able to reach upstream and reproduce, thereby providing an essential food source for the bird.

“We used dippers to show how rapidly a river system can rebound,” Marra said. “But they can also be used as evidence of how contaminant releases affect ecosystems.”

A 10-month study on aquatic bugs, which are known to accumulate metals over time, will be released later this week, said Scott Roberts, an aquatic biologist with Mountain Studies Institute, which is part of a multi-year monitoring program on the Animas.

And while the institute and others look below the surface, a group of self-organized volunteers operating under the name The American Dipper Project will keep a lookout above this summer.

The project extends along the Animas from behind Home Depot all the way to Silverton. Volunteers are assigned a stretch of the river and asked to visit three times throughout the summer, for a minimum of 20 minutes.

“Not long enough to disturb but long enough to observe what they’re doing,” said Kristi Dranginis, an organizer and owner of Bird Mentor.

Dranginis said the project’s first-year goal is to identify where nests of the American Dipper are located along the Animas. And then in following years, since the bird is non-migratory, behavior such as reproduction can be further analyzed.

“There was a feeling after the spill of what can we do?” said Shelley Silbert, executive director of the Great Old Broads for Wilderness, which is supporting the effort. “This project offers people who are not scientists, or even really skilled bird watchers, to get involved and contribute.”

With no historical data on the bird, Dranginis hopes to correlate the dipper’s habitat with state and federal findings on metal levels. If a particular dipper’s behavior takes a downturn, the group would ultimately like to test the bird – either through blood or its feathers – for any abnormalities or bio-accumulations.

But that’ll be difficult, Morrissey said. Field studies are almost never sufficient to pinpoint the effect of contaminates on a species, she said, and other environmental factors further entangle research.

“That said, it’s additional evidence that’s supposed to get regulators info that can give some clues,” Morrissey said. “And if the pattern holds, even with variations, then you have a greater support for your hypothesis that it’s whatever the disturbance is that’s caused the problem.”

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