marine dead zones: agricultural fertilizers too!

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Christophe
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marine dead zones: agricultural fertilizers too!




by Christophe » 27/06/13, 13:15

A little known phenomenon but nevertheless present in the whole world: the dead zones maritime! Responsible: land pollution ... especially agricultural!

A huge dead zone is forming in the Gulf of Mexico

An area covering half of the surface of Switzerland and where no life remains has been spotted in the Gulf of Mexico. It is due to the fertilizers of American agriculture that flow into the sea.

This is a disturbing phenomenon that is currently affecting the Gulf of Mexico. A huge dead zone, the size of half of Switzerland, is forming in the depths of this inland sea between the USA and Mexico.

It is believed to be the result of rainwater runoff and especially significant flooding this spring in the US Midwest. These would have carried into the sea very large quantities of nitrogen and phosphorus from fertilizers in the agricultural industry. These products would then have allowed giant algae to proliferate, algae that then smothered other marine organisms, reports the National Geographic website.

According to predictions from the Universities of Louisiana and Michigan, which study the phenomenon with the US National Oceanic and Atmospheric Administration, the area would have an estimated size of more than 20'000 km2. Such a phenomenon had already been observed in 2002. But it would be even more important this year.

These dead zones would be common in summer at the estuary mouth of the great American rivers, whether in the oceans or even the great lakes. But Europe is not spared, since the largest lifeless area ever recorded was spotted in 2010 in the waters of the Baltic Sea, according to National Geographic. A sea that is home to at least 7 10 largest dead zones on the planet ...

Black dots are the dead zones in this 2008 map

Heavy consequences on biodiversity

The phenomenon has serious consequences for marine ecosystems. It kills wildlife that colonizes the ocean floor, such as crustaceans, mussels or worms. However, this usually abundant food is the happiness of fish who are thus deprived of their favorite habitat.

Studies conducted in the Baltic Sea and in the United States since the end of the 1990 years show that many fish, which one could imagine that they could easily escape these areas without oxygen, lose there quickly and die asphyxiated. And lobsters or shrimps are not fast enough to move and also die ineluctably.

The phenomenon is temporary. If it occurs mostly in summer, it does not reproduce every year. And reversibility seems possible. But getting back to normal takes a lot of time. It requires, however, that the man intervene at the source of the problem, the chemicals used in agriculture. And here, the bet is far from being won ...


http://www.tdg.ch/sante/environnement/U ... y/23586750
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Re: Marine dead zones: too much agricultural fertilizer!




by Ahmed » 08/03/20, 22:45

The mystery of the ghost card: https://www.nytimes.com/interactive/201 ... nment.html
It's in English, but I can translate ...
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Re: Marine dead zones: too much agricultural fertilizer!




by izentrop » 08/03/20, 23:26

Ahmed wrote:The mystery of the ghost card: https://www.nytimes.com/interactive/201 ... nment.html
It's in English, but I can translate ...
Farmers are often designated as responsible while the water reprocessing stations only manage to extract 4% of the fertilizers from the main sewer, the rest goes to the river and ends up at the bottom of the oceans.
Livestock excrement is better valued.

So who is the scapegoat, the farmer who recycles his organic matter on the soil surface or the quidam who shits in the water?

A recent study
The research was led by Dr. Sabine Lengger, a scientist at the University of Plymouth, and involved researchers from universities in the United Kingdom and the Netherlands.

They measured stable isotopes of organic carbon in sediment cores taken from the bottom of the Arabian Sea, one of the world's great natural dead zones, in order to clearly understand what contributes to the organic matter they contain. .

In the article, the scientists say it casts doubt on current predictions about the impact of increased concentrations of carbon dioxide in the atmosphere and the resulting increase in temperatures.

They actually believe that dead zones could spread much faster than previously thought, and that future calculations must take bacteria into account in order to accurately predict the full impacts of climate change and activity. human on the marine environment.

The new study is in addition to warnings issued at COP25 by the International Union for Conservation of Nature (IUCN), where it has been reported that the number of known hypoxic dead zones has soared from 45 to 700 sites.

Dr. Lengger, an organic and isotopic biogeochemist in Plymouth, said:

«With global warming and increasing nutrients from rivers, ocean dead zones are expected to expand. They can attract carbon and store it in the deep ocean, but as it grows, it can have devastating effects on marine life, as well as on people who depend economically on fishing.
"Our study shows that the organic matter that sinks to the sea floor does not only come from the sea surface, but includes a major contribution from bacteria that live in the dark ocean and can also fix carbon. Existing models could be missing a key contribution as a result of which people have underestimated the extent of oxygen depletion that we expect in a future warming world.
"Our results explain some of the mismatches in carbon budgets when experimental and modeling estimates are compared - and therefore it should be included in biogeochemical models predicting feedbacks to a warming world. It is imperative to refine the forecasts in biogeochemical models as if the dead zones intensify more than expected (which has already been observed), this will have serious ecological, economic and climatic consequences. " https://www.plymouth.ac.uk/news/could-d ... dead-zones
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Re: Marine dead zones: too much agricultural fertilizer!




by GuyGadebois » 08/03/20, 23:43

izentrop wrote:So who is the scapegoat, the farmer who recycles his organic matter on the soil surface or the quidam who shits in the water?

Both, my captain. And it's called "human activity". These expanding dead zones are caused by entropy, so overpopulation, non-treatment of wastewater, industrial, chemical, plant or animal overexploitation, all that is an addition.
Image
Image
https://fr.boell.org/fr/2018/05/18/des- ... nes-mortes
France is not spared:
http://www.leparisien.fr/societe/pollut ... 135415.php
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Re: Marine dead zones: too much agricultural fertilizer!




by izentrop » 09/03/20, 00:40

I prefer the results of impartial studies than articles of often ideological foundations
GuyGadebois wrote:https://fr.boell.org/fr/2018/05/18/des- ... nes-mortes
France is not spared:
http://www.leparisien.fr/societe/pollut ...135415.php

Link 1: The ricans who throw their rubbish at their Mexican neighbors.
link 2: concerns private laundry https://www.aquaportail.com/definition-698-ecume.html
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Re: Marine dead zones: too much agricultural fertilizer!




by GuyGadebois » 09/03/20, 01:29

izentrop wrote:I prefer the results of impartial studies than articles of often ideological foundations
GuyGadebois wrote:https://fr.boell.org/fr/2018/05/18/des- ... nes-mortes
France is not spared:
http://www.leparisien.fr/societe/pollut ...135415.php

Link 1: The ricans who throw their rubbish at their Mexican neighbors. <<< ??? uh, so what? The result of the races is the dead zone because of pigs and agriculture, mainly.
link 2: concerns private laundry <<< Who manufactures "detergents for individuals" which, let us remember, are added to agricultural, human, cattle, pig, goat and avian effluents ??? The result of the races is an imminent dead zone.

All this is not biased, but measured, attested, verifiable (by many sources) and simply reflects reality: this whole circus is deplorable and must stop. When I was talking about addition it's not for nothing, you have to take everything into account.
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Re: Marine dead zones: too much agricultural fertilizer!




by izentrop » 09/03/20, 08:37

No but let's try to reason without hiding this breast poop that you couldn't see and not that ...

In the USA, they have been the champions of no-till since the https://fr.wikipedia.org/wiki/Dust_Bowl, then it must be peanuts the residues of organic matter spread on the ground which are not retained and which end in the river, on the other hand what is sent in the sewers arrives largely at the bottom of the seas.

Let's relativize my dear Guy, let's relativize, let's not systematically point out the smelly goat.
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Re: Marine dead zones: too much agricultural fertilizer!




by Exnihiloest » 09/03/20, 19:57

izentrop wrote:I prefer the results of impartial studies than articles of ideological foundations often ...


Me too. But the political fights and their small activists have nothing to give a damn about scientific studies, except that which would go in their direction and which they instrumentalize even if 10 times more say the opposite (like that can on the risk of cancer by glyphosate ).

izentrop wrote:...
Link 1: The ricans who throw their rubbish at their Mexican neighbors.
...

In France we have our ricans: the Spanish, if I judge by the waste that we find on the beaches of the Atlantic. Plastic bottles with text printed in Spanish are more common than in French. Unless it comes from Mexico? : Lol:
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Re: Marine dead zones: too much agricultural fertilizer!




by GuyGadebois » 09/03/20, 20:06

izentrop wrote:Let's relativize my dear Guy, let's relativize, let's not systematically point out the smelly goat.

I didn't score anything, I just peeled the bill.
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Re: Marine dead zones: too much agricultural fertilizer!




by izentrop » 09/03/20, 21:38

What is the interest of a foundation: caress their donors in the direction of their ideology. We cannot therefore trust them straight away. There are still some who work for the future of humanity, like Bill Gates.
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