http://au.news.yahoo.com/thewest/a/-/newshome/15001651/gloom-over-anaemic-rivers/

Gloom over 'anaemic' rivers

Authorities have all but abandoned improving the health of big areas of the Swan and Canning rivers in the short term, according to a report that shows the system's condition is anaemic.

The Swan River Trust's annual report painted a bleak picture of the waterway after a year in which it was hit with mass fish kills and several toxic algal blooms.

According to the trust's own monitoring, nitrogen levels were too high at almost half of its stations for the fourth year in a row, while phosphorous levels exceeded benchmarks at 20 per cent of sites.

The report showed the amount of chlorophyll-a - a green pigment that indicates algal growth - was far too high everywhere and had been getting worse since 2008.

And dissolved oxygen levels, which were propped up by oxygen plants as a "last line of defence", were too low in each river area except its lower reaches, which were most affected by seawater.

Crucially, the trust said conditions were not expected to improve in many areas and according to several criteria "in the foreseeable future".

This was because of the system's high embedded nutrient level and Perth's lack of winter rain, which reduced the rivers' ability to flush themselves out.

The trust reported six sewage discharges into the rivers last year, 11 industrial discharges and 22 oil slicks or spills.

A spokeswoman for Environment Minister Bill Marmion said the trust had failed to meet its own benchmarks.

"The trust and its partners deliver many positive initiatives that improve water quality and environmental condition in priority catchment areas," she said.

Greens MP Alison Xamon said the trust's report revealed a grim picture of the health of the rivers and legislative action was urgently needed to clean the system.

Shadow environment minister Sally Talbot said the rivers would not recover until water-soluble fertilisers were banned in the catchment."

Comment

Ms Talbot has missed the point, all fertilizers HAVE to be water soluble. 

All living organisms (bacteria to humans) are about 70% water and can only consume water soluble material. Therefore fertilizer, food and sewage is always water soluble. 

The headline hits the mark, perhaps unintentionally. 
The problem with polluted rivers and lakes is lack of IRON and not excess nutrients. 

Nualgi provides iron on a silica base. 

SOS: Is Climate Change Suffocating Our Seas?

http://www.redorbit.com/news/science/1767833/sos_is_climate_change_suffocating_our_seas/

SOS: Is Climate Change Suffocating Our Seas?

Posted on: Saturday, 10 October 2009, 08:36 CDT

Scientists work to explain why massive "dead zones" have been invading the Pacific Northwest's near-shore waters since 2002

Yet another ecological scourge may earn a place on the ever-lengthening list of problems potentially caused by climate change: the formation of some so-called "dead zones"—huge expanses of ocean that lose virtually all of their marine life at depth during the summer.

Possible connections between climate change and the relatively recent formation of dead zones in the Pacific Northwest's coastal waters are currently being studied by a research team that is funded by the National Science Foundation and co-led by Jack Barth of Oregon State University (OSU) and Francis Chan of OSU. (Jane Lubchenco, who is currently on leave from OSU while serving as the Administrator of the National Oceanic and Atmospheric Administration, also previously co-led the team.)

WORLDWIDE DEAD ZONES

The Earth currently has more than 400 oceanic dead zones, with the count doubling every decade. A single dead zone may cover tens of thousands of square miles.

Dead zones form where microscopic plants, known as phytoplankton, are fertilized by excess nutrients, such as fertilizers and sewage, that are generated by human activities and dumped into the ocean by rivers, or more rarely, where they are fertilized by naturally occurring nutrients. The result: blooms of organic matter that ultimately decompose through processes that rob the ocean of life-sustaining oxygen. Animals that fail to flee dead zones either suffocate or suffer severe stress.

--------------------------
The reference to Phytoplankton is not entirely correct - Cyanobacteria and Dinoflagalletes may lead to fall in DO level, but Diatom Algae leads to increase in DO level. They do not die and decompose, they are consumed by zooplankton or fall to the ocean floor.

This distinction is not being made by most people.
The solution is to get the right type of Phytoplankton to bloom - Diatom Algae.

Pacific Ocean 'dead zone' in Northwest may be irreversible

http://www.latimes.com/news/nationworld/nation/la-na-oregon-ocean9-2009oct09,0,4615320.story

Pacific Ocean 'dead zone' in Northwest may be irreversible
Oxygen depletion that is killing sea life off Oregon and Washington is probably caused by evolving wind conditions from climate change, rather than pollution, one oceanographer warns.

By Kim Murphy
October 9, 2009

Reporting from Corvallis, Ore. - An oxygen-depleted "dead zone" the size of New Jersey is starving sea life off the coast of Oregon and Washington and will probably appear there each summer as a result of climate change, an Oregon State University researcher said Thursday.

The huge area is one of 400 dead zones around the world, most of them caused by fertilizer and sewage dumped into the oceans in river runoff.

But the dead zone off the Northwest is one of the few in the world -- and possibly the only one in North America -- that could be impossible to reverse. That is because evolving wind conditions likely brought on by a changing climate, rather than pollution, are responsible, said Jack Barth, professor of physical oceanography at OSU.

"I really think we're in a new pattern, a new rhythm, offshore now. And I would expect [the low-oxygen zone] to show up every year now," Barth said at a news conference.

Thursday's briefing coincided with the release of a National Science Foundation multimedia report that said the number of dead zones worldwide was doubling every decade.

In the Pacific Northwest, the report said, the areas of hypoxic, or low-oxygen, water that long have existed far offshore began to appear closer to land in 2002, a phenomenon that may mean they are even deadlier to sea life that exists near the ocean floor.

Low-oxygen zones are created when large blooms of plankton form on the surface of the ocean, then decay and fall to the sea floor, where further decay eats up the oxygen in the water.

"When oxygen gets too low in the ocean, it has a deleterious effect on organisms," Barth said. "They either have to flee the area, or they get stressed or even die off. Those die-off [areas] are dead zones."

The affected waters of the continental shelf in Oregon and Washington for the most part are not inundated with polluted river runoff; the nutrients that feed the plankton blooms here come from natural sources, Barth said. And researchers believe a change in the flushing movement of water along the coastline may be responsible.

The gradual warming of surface waters across the north Pacific, the report funded by the National Science Foundation said, has tended to isolate deep waters far below the surface -- allowing less oxygen penetration.

There also has been a change in wind patterns, encouraging the upwelling of that low-oxygen water and inhibiting the natural flushing action of water.

"What we're seeing is changes in the oxygen content of the water and the winds that drive the ocean and cause that flushing," Barth said, calling it a "double whammy."

Although it is possible that the phenomenon could be related to cyclical ocean currents and temperatures, Barth said that he was more inclined to believe it was a long-term result of climate change. He said that researchers had scanned records going back to the 1950s and had seen nothing similar to what has appeared every year off the Oregon coast since 2002.

The worst year on record was 2006, when the Pacific Northwest zone saw an area of "anoxia," or virtually no oxygen at all.

kim.murphy@latimes.com