A tiny goldfish might look cute in a fishbowl on your shelf, but if released into the wild it can grow to a terrifying size and become a menace to the ecosystem. They eat pretty much anything and everything, root up plants causing the water to become cloudy and dark, and reproduce and grow so quickly that almost no predators can stop them.
Great Lakes Now
https://www.greatlakesnow.org/2023/11/were-going-to-need-a-bigger-fishbowl/
Two recently banned pesticides have all but disappeared from the atmosphere around the Great Lakes, while others phased out decades ago are still hanging around.
Marta Venier, an environmental chemist at Indiana University, and her team looked at air samples taken every 12 days since 1990 by the Environmental Protection Agency around the Great Lakes region, which measure the atmospheric concentration of hundreds of compounds, including pesticides, PCBs, and other persistent chemicals.
Great Lakes Now
https://www.greatlakesnow.org/2023/03/some-banned-pesticides-fade-from-great-lakes-air-while-others-persist/
Lake sturgeon, one of the largest and oldest species of fish in the Great Lakes, are in more trouble than we thought.
In December, the International Union for the Conservation of Nature downgraded its status from Least Concern to Endangered based on shrinking populations over the past three generations, which is between 250 and 300 years for this long-lived fish.
Great Lakes Now
https://www.greatlakesnow.org/2023/02/lake-sturgeon-added-to-endangered-list-but-things-are-looking-up/
Invasive zebra and quagga mussels are firmly established in the Great Lakes, and efforts to control them have proved mostly fruitless. But environmental managers still want to know where they are, how many there are and what they are up to, so they can predict how the ecosystem will be affected and protect vital infrastructure.
Great Lakes Now
https://www.greatlakesnow.org/2022/05/ai-technology-invaders-great-lakes/
Just like the atmosphere and the ocean, lakes can be subject to extreme spikes in temperature, and new research shows that the vast majority of these heatwaves over the past 25 years are the result of human-caused climate change.
Iestyn Woolway – a climate scientist at Bangor University in Wales – and his colleagues analysed satellite data of surface temperatures in lakes around the world, including the Great Lakes, to identify when and where heatwaves occurred since the satellites came online in 1995.
Great Lakes Now
https://www.greatlakesnow.org/2022/03/lake-heatwaves-human-climate-change/
Mercury pollution remains a problem in many parts of the Great Lakes, but new research from Canada’s Experimental Lakes Area in northern Ontario shows that efforts to reduce the amount of mercury going into a lake can have quick and dramatic effects on the levels of the pollutant in fish populations.
Great Lakes Now
https://www.greatlakesnow.org/2021/12/fish-recover-mercury-pollution/
The Ontario government is funding projects aimed at helping farmers and landowners preserve water quality of the Great Lakes watershed.
More than $2.5 million was awarded to 19 projects that ranged from green infrastructure projects to helping spread good land management practices to reduce the amount of contaminants and excess nutrients, such as phosphorous, entering the Great Lakes.
Great Lakes Now
https://www.greatlakesnow.org/2021/10/farm-ontario-projects-great-lakes/
Natural populations of oil-degrading bacteria could help to clean up freshwater rivers and lakes after spills from pipelines and trains, researchers have found after experiments that simulated spills in a Canadian lake.
Vince Palace, who led the work at the International Institute for Sustainable Development’s Experimental Lakes Area in western Ontario, said that the methods currently in use for cleaning up spills in rivers and lakes – mostly digging up and dumping contaminated soil – are not particularly effective.
Great Lakes Now
https://www.greatlakesnow.org/2021/07/bacteria-nature-clean-up-oil-spills/
Long-lived chemicals that were banned years or even decades ago in the U.S. and Canada are still turning up in the bodies of fish and migrating terns in the Great Lakes, and they continue to affect the health of those threatened birds.
Scientists found all three chemicals they checked for in the brains and livers of more than two dozen common terns, at all life stages – chicks, juveniles and adults.
Great Lakes Now
https://www.greatlakesnow.org/2020/11/legacy-pollutants-great-lakes-terns-emerald-shiners/
The overall condition of the Great Lakes has been assessed as “fair and unchanging” in the 2019 State of the Great Lakes joint report by the U.S. Environmental Protection Agency and Environmental and Climate Change Canada, published on June 3.
The lakes were assessed on nine indicators of ecosystem health as part of the 2012 Great Lakes Quality Agreement between the United States and Canada.
Great Lakes Now
https://www.greatlakesnow.org/2020/06/state-great-lakes-stable-rollbacks-protection/
