A brand new global research of how calcium concentrations are changing in freshwater lakes all over the world has revealed that in the wider region in Europe and eastern North America, calcium levels are declining towards levels that may be critically low for the reproduction and survival of many aquatic organisms.
The decline of calcium might have vital impacts on freshwater organisms that depend upon calcium deposition, together with integral elements of the food web, such as freshwater mussels and zooplankton.
In Widespread diminishing anthropogenic results on calcium in freshwaters, printed recently in Scientific Reports, researchers found 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, due to this fact, some lakes are approaching levels of calcium that endanger organisms that depend on that calcium for structure and growth.
The research additionally attributes a few of its outcomes to freshwater lakes’ ongoing recovery from the impacts of acid rain.
“Given governmental and industrial action in the last few decades to cut back sulfate deposition related to acid rain, lakes are now subject to much less calcium leaching from surrounding terrestrial areas,” stated Gesa Weyhenmeyer, Professor at the Department of Ecology and Genetics/Limnology, at Uppsala University in Sweden and lead researcher on the research.
“Paradoxically, therefore, successful actions taken to deal with the harmful impacts of acid rain could have led a decline towards critically low levels of calcium for a lot of aquatic organisms.”