Cody Nelson: Shorter Winters and Algal Populations→

NPR:

“A team led by University of Minnesota-Duluth researchers, that was the point: They want to know how shortening winters — and less ice cover on lakes — may increase the presence of harmful algae blooms and impact the fishery. Aside from people who ice fish, the general assumption is that not much happens in lakes during winter, said Andy Bramburger, a research associate from the U’s Duluth campus.

The biggest effect of climate change on lakes isn’t necessarily how warm it gets, but how cold it doesn’t get. These warmer winters are shorter, so more sunlight can reach the water earlier, jumpstarting algae production and affecting the lake’s biology.”

NASA: Less Algae, Not Clear Water, Keeps A Lake Blue→

“Lake Tahoe’s iconic blueness is more strongly related to the lake’s algal concentration than to its clarity, according to research in “Tahoe: State of the Lake Report 2015,” released today by the Tahoe Environmental Research Center (TERC) of the University of California, Davis. The lower the algal concentration, the bluer the lake.

Data from a research buoy in the lake, owned and operated by NASA’s Jet Propulsion Laboratory, Pasadena, California, enabled Shohei Watanabe, a postdoctoral researcher at TERC, to create a Blueness Index that quantified Lake Tahoe’s color for the first time.

The assumption that lake clarity is tied to blueness has driven advocacy and management efforts in the Lake Tahoe Basin for decades. But Watanabe’s research showed that at times of the year when the lake’s clarity increases, its blueness decreases, and vice versa.

Watanabe combined the blueness measurements with data on clarity. Clarity is measured by observing the depth at which a dinner-plate-sized white disk remains visible when lowered into the water. He was surprised to find that blueness and clarity did not correspond. In fact, they varied in opposite directions.

This is due to seasonal interplay among sediment, algae and nutrients in the lake. Clarity is controlled by sediment. Blueness is controlled by algal concentration, which in turn is controlled by the level of nutrients available to the algae.”

Lake Erie is Polluted→

Behind Toledo’s Water Crisis, a Long-Troubled Lake Erie
By Michael Wines, The New York Times:

Haraz N. Ghanbari/AP

“It took a serendipitous slug of toxins and the loss of drinking water for a half-million residents to bring home what scientists and government officials in this part of the county have been saying for years: Lake Erie is in trouble, and getting worse by the year.

Flooded by tides of phosphorus washed from fertilized farms, cattle feedlots and leaky septic systems, the most intensely developed of the Great Lakes is increasingly being choked each summer by thick mats of algae, much of it poisonous. What plagues Toledo and, experts say, potentially all 11 million lakeside residents, is increasingly a serious problem across the United States.

But while there is talk of action — and particularly in Ohio, real action — there also is widespread agreement that efforts to address the problem have fallen woefully short. And the troubles are not restricted to the Great Lakes. Poisonous algae are found in polluted inland lakes from Minnesota to Nebraska to California, and even in the glacial-era kettle ponds of Cape Cod in Massachusetts.”

If you don't advance new pollution control efforts now — if you choose the quick and easy path — you will become an agent of darkness.

Lake of the Woods Algal Blooms are Worsening→

Ron Meador, reporting for MinnPost:

Lee Grim

“Key points from the International Joint Commission’s second “State of the Basin” report, released on Tuesday:

- Massive blooms of blue-green algae are on the rise in Lake of the Woods, despite reductions in flows of phosphorus into upstream lakes and streams from industrial polluters; some of this seems to be driven by phosphorus releases from lake sediments, and some by climate change.
- Rivers in the basin are showing improved water quality, primarily because of controls on paper mills and other industrial sources.
- Walleye, lake trout and sturgeon populations have been recovering as a result of special management efforts, and certain bird populations have returned to healthy levels thanks to reduced pesticide use.
- Mercury levels in fish remain high in many lakes, such that anglers are advised to check the status of public-health advisories before eating any fish caught anywhere in the basin.”

IJC State of the Basin Report

We always find what we dumped in.