Microbes dictate regime shifts causing anoxia in lakes and seas – “Hysteresis loops and tipping points are a common feature of oxic-anoxic transitions, causing rapid drops in oxygen levels that are not easily reversed”

6 October 2017 (UvA News) – Gradual environmental changes due to eutrophication and global warming can cause a rapid depletion of oxygen levels in lakes and coastal waters. A new study led by professors Jef Huisman and Gerard Muyzer of the University of Amsterdam (UvA) shows that microorganisms play a key role in these disastrous […]

Nitrogen cycle in coastal waters: Hamburg Harbor becomes a nitrate hotspot

By Tim Schröder 3 August 2017(Helmholtz-Zentrum Geesthacht) – Nitrogen compounds are an important factor in the production of algal biomass. The team led by biologist Kirstin Dähnke from the Institute of Coastal Research at the Helmholtz-Zentrum Geesthacht has been carrying out extensive Elbe nitrogen measurements for this reason.These measurements have shown that regions upstream from […]

Image of the Day: Satellite view of plankton bloom in Washington’s Hood Canal, 31 July 2017

By Kathryn Hansen 2 August 2017 (NASA) – Looking over the edge of a boat, it would be easy to mistake the jewel-toned waters for the Caribbean Sea. But you are more likely to find geoducks and barnacles than you are to find grouper and white sandy beaches. In the Pacific Northwest, the water does […]

Gulf of Mexico dead zone is the largest ever measured

2 August 2017 (NOAA) – Scientists have determined this year’s Gulf of Mexico “dead zone,” an area of low oxygen that can kill fish and marine life, is 8,776 square miles, an area about the size of New Jersey. It is the largest measured since dead zone mapping began there in 1985.The measured size is […]

Burning fossil fuels almost ended all life on Earth – “It should be a national priority to study the Permian to figure out what the hell happened”

By Peter Brannen 11 July 2017 (The Atlantic) – “Who you with?” “I’m a science journalist,” I said, jolted from my reverie on the shoulder of I-68 in Maryland, where a crowd of geologists had gathered on a field trip to poke at some rocks revealed by the highway department’s dynamite. The rocks, slate gray […]

UN Ocean Conference opens with calls for united action to reverse human damage

5 June 2017 (United Nations) – Opening a “game-changing” international conference on the health of the world’s oceans and seas, top United Nations officials today urged coordinated global action to protect the planet.Speaking in the UN General Assembly Hall, Secretary-General António Guterres cautioned Governments that unless they overcome short-term territorial and resource interests, the state […]

Jurassic drop in ocean oxygen lasted a million years

12 May 2017 (University of Exeter) – Dramatic drops in oceanic oxygen, which cause mass extinctions of sea life, come to a natural end – but it takes about a million years. The depletion of oxygen in the oceans is known as “anoxia”, and scientists from the University of Exeter have been studying how periods […]

Decades of data on world’s oceans reveal a troubling oxygen decline

ATLANTA, Georgia, 3 May 2017 (Georgia Tech) – A new analysis of decades of data on oceans across the globe has revealed that the amount of dissolved oxygen contained in the water – an important measure of ocean health – has been declining for more than 20 years. Researchers at Georgia Institute of Technology looked […]

Global warming making oceans more toxic by increasing algae blooms – “The distribution, frequency, and intensity of these events have increased across the globe”

STONY BROOK, N.Y., 26 April 2017 (SBU) – Climate change is predicted to cause a series of maladies for world oceans including heating up, acidification, and the loss of oxygen.  A newly published study published online in the April 24 edition of the Proceedings of the National Academy of Sciences, titled, “Ocean warming since 1982 […]

Sub-ice phytoplankton blooms in Arctic Ocean increasing rapidly as sea ice thins – “The meter decline in sea ice thickness in the Arctic in the past 30 years has dramatically changed the ecology”

By Leah Burrows29 March 2017 (Harvard Gazette) – In 2011, researchers observed something that should be impossible — a massive bloom of phytoplankton growing under Arctic sea ice in conditions that should have been far too dark for anything requiring photosynthesis to survive. So, how was this bloom possible? Using mathematical modeling, researchers from the […]

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