Tag Archives: anoxic

New Research Shows Elevated Mercury from in-Ground Wastewater Disposal

As towns across Cape Cod struggle with problems stemming from septic systems, a recent study by a Woods Hole Oceanographic Institution (WHOI) scientist focuses on one specific toxic by-product: mercury. In a study of local groundwater, biogeochemist Carl Lamborg found microbial action on wastewater transforms it into more mobile, more toxic forms of the element.

His findings were published in Environmental Science and Technology in November 2013. (more…)

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Widespread Ancient Ocean “Dead Zones” Challenged Early Life

*Persistent lack of oxygen in Earth’s oceans affected animal evolution*

The oceans became oxygen-rich as they are today about 600 million years ago, during Earth’s Late Ediacaran Period. Before that, most scientists believed until recently, the ancient oceans were relatively oxygen-poor for the preceding four billion years.

Now biogeochemists at the University of California-Riverside (UCR) have found evidence that the oceans went back to being “anoxic,” or oxygen-poor, around 499 million years ago, soon after the first appearance of animals on the planet. (more…)

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