Calcium levels in freshwater lakes declining in Europe and North America

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A new global study of how calcium concentrations are changing in freshwater lakes around the world has revealed that in widespread areas in Europe and eastern North America, calcium levels are declining towards levels that can be critically low for the reproduction and survival of many aquatic organisms.

The decline of calcium may have significant impacts on freshwater organisms that depend on calcium deposition, including integral parts of the food web, such as and zooplankton.

In Widespread diminishing anthropogenic effects on calcium in freshwaters, published recently in Scientific Reports, researchers discovered that the global median calcium concentration was 4.0 mg L-1, with 20.7% of the water samples showing calcium concentrations ? 1.5 mg L-1.

1.5 mg L-1 is a threshold considered critical for the survival of many organisms that require calcium for their survival, therefore, some lakes are approaching levels of calcium that endanger organisms that rely on that calcium for structure and growth.

The study also attributes some of its results to ' ongoing recovery from the impacts of acid rain.

"Given governmental and industry action in the last few decades to reduce sulphate deposition associated with acid rain, lakes are now subject to less calcium leaching from surrounding terrestrial areas," said Gesa Weyhenmeyer, Professor at the Department of Ecology and Genetics/Limnology, at Uppsala University in Sweden and lead researcher on the study.

"Paradoxically, therefore, successful actions taken to address the harmful impacts of may have led a decline towards critically low levels of for many aquatic ."

The study drew on 440,599 water samples from 43,184 inland water sites from 57 countries and analyzed decadal trends in over 200 water bodies since the 1980s. It was a global study conducted by multiple researchers across Europe and North America. IISD Experimental Lakes Area—the world's freshwater laboratory— in northwestern Ontario, Canada, contributed expertise and data from its unparalleled long-term monitoring dataset of over 50 years.


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More information: Gesa A. Weyhenmeyer et al, Widespread diminishing anthropogenic effects on calcium in freshwaters, Scientific Reports (2019). DOI: 10.1038/s41598-019-46838-w
Journal information: Scientific Reports

Provided by IISD Experimental Lakes Area
Citation: Calcium levels in freshwater lakes declining in Europe and North America (2019, August 6) retrieved 18 August 2019 from https://phys.org/news/2019-08-calcium-freshwater-lakes-declining-europe.html
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Aug 06, 2019
I have read misleading science stories before. I have read ignorant science stories before. I have read uninformative science stories before.

But this story set a new record for the least amount of science in a science story.
What were previous levels? What was the maximum? Are levels still dropping? How fast?
Any changes being contemplated? What related organisms may be affected? Is there followup being done? By who?
Has this happened before? How close to current events?

It "may have significant impact". Such as? Is there ANY documented impact? How significant?

Are we sure this was not written by republicans? No useful knowledge given.

Aug 06, 2019
e, please share with the rest of us the answers to your questions
when you contact the researchers
& read the original source material
links at end of the above article

thanks, i appreciate you clarifying this subject

Aug 07, 2019
BAN PLUTONIUM!

Aug 07, 2019
I have read misleading science stories before. I have read ignorant science stories before. I have read uninformative science stories before.

But this story set a new record for the least amount of science in a science story.


You set a record for not knowing which is the science story - which is in the paper you obviously did not read - and the press release that informs us where the science is to be found.

From the paper: "For evaluation of temporal changes, we analyzed complete time series (at least four measurements per year) of Ca and pH (available from 297 freshwaters), carbonate alkalinity (available from 211 freshwaters) and sulfate concentrations (available from 213 freshwaters; here used as a proxy for the influence of anthropogenic acidification) from 1980 to 2017 (Table 1)."

And so on.

To add hurt to harm, you then propose a political conspiracy theory. [ https://en.wikipe...r_effect ]

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