April 7th, 2014 by iisg_superadmin
White Lake, located in Michigan just north of Muskegon, has long been listed as an Area of Concern in the Great Lakes region. Federal officials are currently moving forward on one of the last efforts to remove the lake from the AOC list.
“The lake is one of 14 major sites in Michigan on a list of toxic hot spots in the Great Lakes region. The cleanup work is difficult and expensive, but it’s expected to improve conditions for people and wildlife throughout the region.
Read the complete story at the link above.
March 12th, 2014 by iisg_superadmin
While much of the press about a carp invasion in the Great Lakes has focused on the bighead and silver varieties of Asian carp, a new study is showing that grass carp are making their way into and threatening the Lakes as well.
“Grass carp, a plant-eating species of the invasive Asian carp family, have also been found spawning in Lake Erie and its many tributaries…
Though fears over invading Asian carp have largely centered on bighead and silver carp — which gulp down large amounts of plankton, the all-important food-source foundation for a healthy aquatic ecosystem — the new study suggests conservationists should pay attention to grass carp too.
Grasses are also an important nutritional source for native fish species, and as its name suggests, grass carp could prove detrimental in that department.
The U.S. government has already spent upwards of $200 million trying to slow the encroachment of Asian carp into the Great Lakes. Many worry their growing presence will turn the Great Lakes into one giant carp pond — ruining ecological diversity and the multi-billion dollar fishing industry in the region. Regional authorities remain in discussion with federal agencies over further mitigation efforts.”
Read the complete article at the link above.
March 11th, 2014 by iisg_superadmin
Water levels in the Great Lakes, especially the Lake Michigan and Huron combo, have been a concern in recent years. But with this winter’s heavy snow and ice coverage, the water levels of both lakes may rise as much as 14 inches this spring and summer.
“This winter, the abundance of snow and near-record ice cover are the reasons for the rebound in water levels, according to Keith W. Kompoltowicz, a meteorologist with the Corps’ office in Detroit.
Snowfall around Lake Michigan is 30% higher than any time in the last decade, and ice cover on the lake is flirting with a record.
On Tuesday, ice on Lake Michigan reached 92.45%, according to the Great Lakes Environmental Research Laboratory in Ann Arbor, Mich. That’s the second highest level since the record of 93.1% in 1977…
But the winter of 2013-’14 can only have so much effect on the lakes. Water levels are cyclical and rise and fall due to a series of events over many months and years, Kompoltowicz said.
Even if the next six months mirrors the rainy spring of 2013, Kompoltowicz said, Lake Michigan and Lake Huron might reach within a few inches of the lakes’ long-term average. The Corps doesn’t make predictions beyond six months.”
Read more about the lake levels and the potential effects at the link above.
March 6th, 2014 by iisg_superadmin
Quagga and Zebra mussels have been a problem for waterways including the Great Lakes for decades, but there may finally be a targeted solution that can significantly reduce their numbers without disrupting other organisms.
“Now the mussels may have met their match: Daniel P. Molloy, an emeritus biologist at the New York State Museum in Albany and a self-described ‘Bronx boy who became fascinated by things living in water.’
Inspired by Rachel Carson’s ‘Silent Spring’ in high school, Dr. Molloy, now 66, has long been a pioneer in the development of environmentally safe control agents to replace broad-spectrum chemical pesticides.
As a result, New York State has awarded a license to Marrone Bio Innovations, a company in Davis, Calif., to develop a commercial formulation of the bacterium. The product, Zequanox, has been undergoing tests for several years, with promising results. (Dr. Molloy has no financial ties to the company.)
Zequanox killed more than 90 percent of the mussels in a test using tanks of water from Lake Carlos in Minnesota, said James A. Luoma, a research biologist with the United States Geological Survey in La Crosse, Wis. A control group of freshwater mussels, unionids from the Black River in Wisconsin, were unharmed.”
Read the rest of the article at the link above.
February 11th, 2014 by iisg_superadmin
Illinois river otters are just one of the susceptible organisms in the local environment, and a recent study is showing that they are indicating some very high levels of dangerous toxins (including a banned insecticide).
“‘Thus otters serve as biomonitors – organisms that contain information on the quantitative and qualitative aspects of the environment – of wildlife exposure,’ according to a new study. They also serve as biomonitors for human health because the same toxic chemicals found in otters have also been found in people who eat contaminated fish.
The study published in the journal ‘Ecotoxicology and Environmental Safety’ found high concentrations of chemical compounds in the livers of 23 otters in central Illinois.
Especially troubling were the highest concentrations of dieldrin ever reported in otters anywhere in the United States, said lead author Samantha Carpenter, a wildlife technical assistant at the University of Illinois, Urbana-Champaign.
Dieldrin is one of the organochlorine insecticides banned in 1978. More than three decades later, high levels of the chemicals remain in river sediments and accumulate in the fish that otters and people may eat.
The compound has been linked to neurological, behavioral and immune-suppression problems in wildlife. Scientific studies disagree on adverse human effects, but some studies have linked dieldrin to asthma, Parkinson’s disease, Alzheimer’s disease and breast cancer, Carpenter said.”
Read the complete article at the link above.
February 5th, 2014 by iisg_superadmin
This winter weather hasn’t exactly been friendly to people, but it has definitely been helping out the Great Lakes (and possibly wildlife in and around the Lakes too).
“Nearly 60% of the lakes are now under a cover of ice, according to the Great Lakes Environmental Research Laboratory in Ann Arbor, Mich.
The ice cover could help lake levels this summer, but that is far from certain. And biologists are keeping a close eye on northern Lake Superior in the hope that an ice bridge will link Ontario to Isle Royale.
The island is the home to a struggling gray wolf population in desperate need of new genetic stock — and more wolves.
One possible effect of so much ice this winter is that come summer the ‘lake effect’ in cities such as Milwaukee, Chicago and Duluth, Minn., could be even cooler.
The ice cover this winter is a stark contrast to last winter, when the five lakes had only 38% cover, according to the research laboratory, which tracks ice conditions on the lakes. The long-term average of the lakes is about 50%, according to George Leshkevich, a scientist with the laboratory, which is part of the National Oceanic and Atmospheric Administration.”
Read the complete article at the link above.
February 4th, 2014 by iisg_superadmin
Following the U.S. Army Corps of Engineers’ report on Asian carp entering the Great Lakes (and methods to prevent them), there have been some articles looking more closely at the methods.
“Because of this, engineers have been encouraged to develop just about any solution to keep carp at bay — or out of one.
One such solution was the electric barrier in the Chicago Sanitary and Ship Canal, which was meant to keep Asian carp from swimming through the CAWS and into Lake Michigan. Of the identified 18 points of entry into the Great Lakes, the Army Corps believes the CAWS point is the most critical.
The barrier consists of three electrodes arranged in a line. These electrodes power a barrier much like an electric fence for dogs. Fish swimming into it receive an electric shock sufficient enough to stun them and keep them out — in theory. According to a report issued by the Army Corps in December, 2013, the barrier is effective against adult carp, but smaller fish of two to four inches long were able to find a loophole…
…It’s a big risk to take when plans require billions in funding. Still, an appropriate plan may pay off in the long term. Recent studies suggest that controlling the spread of invasive species already present in the Great Lakes can cost up to $800 million annually.”
Read more about the options at the link above, including a large graphic that helps visualize some of the suggested methods for controlling or preventing Asian carp from reaching the Great Lakes.
January 22nd, 2014 by IISG
The cure for some of the world’s deadliest diseases may be living at the bottom of the Great Lakes. This is the theory Brian Murphy, a medicinal chemist at the University of Illinois at Chicago (UIC), set out to test in 2012 when he scoured Lake Huron in search of a largely unexplored type of bacteria that may hold the key to new treatments.
The IISG-funded study unearthed more than 600 strains of freshwater actinomycete bacteria, making it one of the largest “libraries” of its kind in the world. Murphy—with help from UIC researchers Scott Franzblau, Joanna Burdette, and Lijun Rong—is still testing whether these strains can be used to create new treatments for tuberculosis and other life-threatening diseases. But their initial results suggest that at least a handful of freshwater bacteria could lead to new cures.
A microbe’s medicinal power lies in the small compounds they make to defend themselves, which can destroy cell walls, prevent DNA from replicating like it should, and more. Current treatments for many diseases are built around the chemical defenses used by land-based cousins of the bacteria Murphy has collected. But some treatments, like the ones for tuberculosis, require patients to be on a complex cocktail of antibiotics for months at a time. Worse still, a growing number of diseases are now resistant to standard drugs. The hope is that some of the freshwater bacteria in Murphy’s library might create molecules that dangerous pathogens have yet to evolve defenses against.
“Researchers have been operating on the assumption that bacteria in the lake are nearly identical to what are found on the land,” said Murphy. “But we think these freshwater strains are likely to produce new molecules that target diseases in different ways.”
Murphy and his team will spend the next few months scrutinizing chemical compounds from 10 actinomycete strains already showing disease-fighting potential and comparing them against known antibiotics, anti-virals, and anti-cancer agents. At the same time, they will keep working through their bacterial library hoping to find even more molecules with drug-like potency.
Just as important as finding new molecules is learning more about the relationship between a microbe’s chemical properties and where it lives. This is where Murphy’s library of strains really comes in. Its size and diversity will help reveal both whether aquatic actinomycete bacteria are significantly different than their land-based counterparts and if strains found in different lakes use unique chemical defenses.
“One of the biggest barriers in the discovery of new drugs is knowing where to look,” said Murphy. “Knowing where bacteria populations are similar and where they are different helps us figure out exactly where to sample when looking for new drugs.”
Because of his collection, Murphy has already discovered that the makeup of actinomycete communities in Lake Huron varies both by location and depth, a diversity that makes the lake a potentially important site in the hunt for new cures.
January 15th, 2014 by Irene Miles
The most recent report from the U.S. Army Corps of Engineers regarding invasive species and threats to the Great Lakes recommends a pricey but perhaps necessary project – separating the Chicago River and Lake Michigan from each other.
From The Atlantic Cities:
“Over the last decade or so, a huge range of interests — from environmental groups to fishermen to shipping experts to politicians — have raised the alarm over just how much this artificial connection has created an opening for invasive species such as the Asian carp to make their way through North America’s waterways. And the costs associated with the damage caused by these species have been high enough to prompt serious consideration of closing off the link between the Mississippi and the Great Lakes.
How high? First, consider the figure $18 billion. That’s the estimate the U.S. Army Corps of Engineers released last week to re-insert a physical separation between the Great Lakes and the Mississippi system. The full report, the Great Lakes and Interbasin Mississippi River Study, was commissioned by Congress to address the growing threat of invasive species in the area known as the Chicago Area Waterway System. The final report details a wide spectrum of actions — ranging from essentially maintaining the status quo to engineering a complete separation over a 25-year period — but doesn’t offer recommendations on which course to take.”
Visit the link above for the complete article, which includes very interesting numbers related to the threat of invasive species (and the long-term costs of managing/controlling them if no action is taken).
