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Author Topic: Whales give carbon a bum steer  (Read 295 times)

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Offline Isis

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Whales give carbon a bum steer
« on: June 18, 2010, 05:01:51 PM »
Whales give carbon a bum steer
DEBORAH SMITH, SCIENCE EDITOR
June 17, 2010



SPERM whales in the Southern Ocean are doing their bit for the battle against global warming.

The giant mammals help remove about 400,000 tonnes of carbon from the atmosphere a year by releasing large quantities of liquid faeces into the upper layers of the ocean, Australian researchers have calculated.

Trish Lavery, of Flinders University, said whale poo is rich in iron and stimulates the growth of phytoplankton - microscopic plants that soak up carbon dioxide. ''When the phytoplankton die, the trapped carbon sinks to the deep ocean.''

Ms Lavery and her team have estimated that industrial culling of sperm whales has resulted in an extra 2 million tonnes of carbon dioxide a year remaining in the atmosphere. ''It makes a compelling case for an immediate ban on whaling,'' she said.

Whales had previously been accused of having a large carbon footprint because they exhale a lot of carbon dioxide, a greenhouse gas. But the study shows they more than offset these emissions by defecating.

Sperm whales, of which there are an estimated 12,000 in the Southern Ocean, dive deep to consume a diet of squid and fish.

The researchers calculated they release about 50 tonnes of iron near the surface in their faeces, which floats around and fertilises the iron-poor waters, increasing phytoplankton blooms.

Although whales exhale about 200,000 tonnes of carbon a year, the net gain is 200,000 tonnes of carbon locked in the ocean for hundreds or thousands of years.

The sperm whales in the Southern Ocean represent only about 3 per cent of the global population, and those elsewhere could also make a significant contribution to carbon removal from the atmosphere, the researchers said.

So could other kinds of whales and sea creatures that feed deep in the ocean and poo in the surface layers where light is available for photosynthesis.

''Seals and sealions often consume prey at depth, but whether the waste is liquid and buoyant requires further investigation,'' the researchers said.

Before whaling began there used to be about 10 times as many sperm whales in the Southern Ocean.

http://www.smh.com.au/environment/whale-watch/whales-give-carbon-a-bum-steer-20100616-ygjr.html

Evo

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Re: Whales give carbon a bum steer
« Reply #1 on: June 18, 2010, 05:42:12 PM »
Welcome to the forum Isis - thanks for the post.  :agree:

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Re: Whales give carbon a bum steer
« Reply #2 on: June 19, 2010, 09:47:10 AM »
Welcome to the forum Isis - thanks for the post.  :agree:

Looks like they are having a whale of a time :D :agree:

                 
                          
 

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Re: Whales give carbon a bum steer
« Reply #3 on: June 19, 2010, 02:45:24 PM »
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Offline Isis

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Re: Whales give carbon a bum steer
« Reply #4 on: June 19, 2010, 05:48:39 PM »
Terrible risk for whales

The nations that make up the International Whaling Commission (IWC) meet next week to decide whether to allow whaling in Antarctic waters for the next decade.

If the decision does not go Australia's way, Japan will be legally permitted to hunt hundreds of whales each year until 2020.

There wouldn't be much anyone could do to stop it, and Australia's legal action against Japanese whaling would probably become irrelevant.

Australia has a plan to counter the pro-whaling push at next week's watershed five-day meeting of the IWC in Morocco.

But Environment Protection Minister Peter Garrett, who will lead the Australian delegation, warns it might not be enough.

He says there is a real risk that the current moratorium on commercial whaling - which hampers Japan's whaling program - will be lifted.

"We will do whatever we can to make sure that there isn't a majority for a proposal to leave the moratorium on commercial whaling in tatters on the floor," Mr Garrett said from his office in Parliament House.

"That would be a terrible, terrible result."

While anti-whaling sentiment in Australia appears to have been gathering strength, the IWC is moving further away from whaling bans. The best result for conservationists out of the summit could be the status quo.

The 88-member IWC has long been paralysed by a rift between pro- and anti-whaling countries. Neither side can muster the 75 per cent of votes needed to have its way; the result is a stalemate.

The status quo is that commercial whaling is banned but countries can get around the ban. Japan says it hunts whales for scientific research, which is technically allowed.

Things are different at the IWC this time around. Key countries are tiring of the impasse.

IWC chairman Cristian Maquieira - who will not attend the meeting - is pushing a compromise proposal that would overturn the 24-year-old ban on commercial whaling while reducing the number of whales killed each year.

It is this proposal that Australia wants to scotch.

Mr Garrett's plan is to rally the support of anti-whaling allies - including South American countries, New Zealand, Britain, Germany and possibly the US - which have expressed some support for the compromise. Australia's special envoy on whaling Sandy Hollway will be in Morocco, too.

The minister will be pushing Australia's alternative proposal of a phase-down and cessation of Antarctic whaling, which is not expected to get up.

"The prospects are stretched," Mr Garrett said of his proposal.

"Given that there's some really difficult and quite challenging issues that have come on to the table ... I think it's time for us to just get in there, stand up and argue as strongly as we need to that we don't take steps backwards."

Australia will also push for specific restrictions on whaling in the Southern Ocean, and try to make it harder to hunt whales in the name of science.

At the moment a country decides for itself if the science justifies the hunting of whales. Mr Garrett wants an IWC scientific committee to take on that role.

The IWC meeting is pivotal to the chances of Australia's legal action against Japan, lodged recently in the International Court of Justice. The case rests on IWC rules, but will be judged from outside the IWC so is not expected to dominate next week's summit.

Australia is arguing that Japanese "scientific" whaling is commercial whaling in disguise, so is against the law.

But if the IWC overturns the ban on commercial whaling, Japan will not need to use the "scientific" justification, so the point becomes moot.

Mr Garrett, a former high-profile conservationist and activist-musician, appears to hold little hope the IWC summit will be a win for the whales.

But he is optimistic the battle will be won eventually.

"In the long term I think ... that we will get there."

http://www.smh.com.au/environment/whale-watch/terrible-risk-for-whales-garrett-20100618-yldo.html

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Re: Whales give carbon a bum steer
« Reply #5 on: June 20, 2010, 08:09:40 AM »
will we have any life left in the oceans in 20 years?