Jennifer Marohasy

a forum for the discussion of issues concerning the natural environment

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WWF Report on World’s Worst Rivers: Wrong Way Round on the Murray-Darling

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The World Wildlife Fund (WWF) has just released a report entitled ‘World’s Top 10 River’s at Risk’.

Australia’s Murray-Darling is included in the top 10. But it’s two rivers, so maybe the title should be ‘World’s Top 11 River’s at Risk’?

The report goes onto state that, “The Murray and Darling Rivers have great variability in year to year flows, and their ecology is driven by large floods covering their extensive flood plains and intervening dry periods.”

This may be the case for stretches of the Darling River, but the Murray is now a completely regulated system which, has even during this worst drought, been mostly full of water.

Anyway, this new report which has generated much publicity for WWF has identified the “key threat” to the Murray-Darling as “invasive species, especially from aquarium trade”.

But, interestingly, key invasive fish species identified in the report were not introduced recently or from the aquarium trade.

According to the new WWF report, native fish species such as the Silver Perch, Freshwater Catfish and the large Murray Cod are all “in rapid decline” while numbers of invasive species have significantly increased.

The report cites a government report, Barrett 2004, and a World Resource Institute website, WRI 2003, to support the contention that numbers of native fish are in decline and another government report, but also on the native fish strategy, MDBC 2005, as evidence numbers of invasive species are on the increase.

But none of these reports included good credible data on changes in numbers of invasive or native fish species.

The government’s native fish strategy was written by ecologist Jim Barrett. I contacted Mr Barrett when I was writing ‘Myth & the Murray: Measuring the Real State of the River Environment’ back in 2003.

Based in part on information provided by Mr Barrett, I wrote in that report that, “Since the 1980s, carp numbers [a key invasive species in the Murray River] have been observed to decline and downstream of Yarrawonga, numbers are thought to be about half what they were in 1997 and are now estimated to represent 21 per cent of total fish numbers. According to the Murray Darling Basin Commission (MDBC) a likely explanation for the decline in carp numbers is that the initial population boom resulted in an overutilization of available resources and subsequent reduction to equilibrium carrying capacity for this species. In contrast, local fishermen attribute the observed reduction in carp numbers to predation from an increasing Murray cod population.”

The WWF report acknowledges that, “since 1996 A$2 billion has been allocated to recover water to increase environmental flows and restore fish passage for the lower 1,800 km of Murray River.”

But in the next paragraph, without providing any data, falsely concludes that “despite these worthy initiatives, the ecological health of the rivers continues to decline.”

But even the typically pessimistic head of the Murray Darling Basin Commission (MDBC) Dr Wendy Craik recently described the “visionary Native Fish Strategy” as a success with “solid evidence” that native fish are using the new innovative fishways built as a part of the sea to Hume Dam fish passage program. Furthermore, Dr Craik claimed another success in the “resnagging” project in which large tree stumps, or snags, are placed strategically into rivers. The snags provide refuge from fast-flowing water and help to recreate original river habitats for native fish.”

But when is the MDBC, or WWF, or someone else, going to start collecting some good credible data on fish numbers?

In summary, the WWF report ‘World’s Top 10 River’s at Risk’ which is making news today, is about 20 years out of date at least with respect to the Murray River. Indeed while numbers of native fish have on average, probably declined since European settlement, with a crash in Murray Cod populations in the early 1960s, there is evidence to suggest numbers of native fish, including the Murray Cod, are now on the increase while invasive species are on the decline. So the WWF has got it all the wrong way around. Then again, they are perhaps more interested in ‘hand-waving’ than river ecology.

Sea Level Falls, Temperature Plummets Off Sydney

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Earlier this year I spent a week at the beach, more specifically at Bluey’s Beach, on the NSW mid-north coast. My daughter and partner are both keen surfers. So, always in search of that best wave break, we also visited Boomerang, Elizabeth, Seal Rocks and a few other beaches.

I’m used to southeast Queensland with the summer water temperature a very pleasant 26C or so, and expected the same in NSW.

But the first day we went surfing it was a very cold 14C!

So much for the global warming of sea temperatures I thought as I shivered on the beach that day.

The locals explained that it was unusual, but they didn’t seem to have a good explanation. Interestingly, the water wasn’t so cold every day or at every beach.

According to a recent article in Sydney’s The Daily Telegraph a “massive, mysterious whirlpool of cold water” formed off Sydney in January and is still active “forcing the sea surface to fall almost 1m and ocean currents to change course”.

So sea levels are falling off Sydney?

According to the CSIRO, oceanographers have identified a huge, dense mass of cold water off Sydney but know very little about what causes it.

“What we do know is that this is a very powerful natural feature which tends to push everything else aside – even the mighty East Australian Current,” says CSIRO’s Dr David Griffin.

Dr Griffin, from the Wealth from Oceans Flagship Research program, said cold-water eddies regularly appear off Sydney.

“Until 20 years ago we would not have known they even existed without accidentally steaming through them on a research vessel,” he said.

“However, now that we can routinely identify them from space via satellite, marine scientists can evaluate their role as a source of life in the marine ecosystem.”

Reaching to a depth of more than 1000m, the 200km diameter ocean eddy has a rotational period of about seven days. Its centre is about 100km directly offshore from Sydney.” [end of quote]

Now I’m waiting for a best AGW explanation for this dramatic, even if localized and ephemeral, drop in sea level and sea temperature.

The Debating Has Really Only Just Begun Over Global Warming

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While various commentators have suggested that the debate is over, that anthropogenic global warming is a reality and the deniers should be silenced, if not jailed, last week there was a high profile debate on the motion “Global Warming is not a Crisis” in New York.**

The proposition, Michael Crichton, Richard Lindzen and Philip Stott, won by 46% to 42%. Before the event the organizers found the motion would have been disapproved of 57% to 30%, indicating a swing in favour of the global warming skeptics.

This morning I received an email requesting I post the details of a second possible debate, this time between The Viscount Monckton of Brenchley and Vice-President Albert Gore on the subject “That our effect on climate is not dangerous” to be held in the Library of the Oxford University Museum of Natural History at a date of the Vice-President’s choosing.

Ewire.com is advertising the debate with comment that:

“Monckton a former policy adviser to Margaret Thatcher during her years as Prime Minister of the United Kingdom said, “A careful study of the substantial corpus of peer-reviewed science reveals that Mr. Gore’s film, An Inconvenient Truth, is a foofaraw of pseudo-science, exaggerations, and errors, now being peddled to innocent schoolchildren worldwide.”

Monckton and Gore have once before clashed head to head on the science, politics, and religion of global warming in the usually-decorous pages of the London Sunday Telegraph last November.

Monckton calls on the former Vice President to “step up to the plate and defend his advocacy of policies that could do grave harm to the welfare of the world’s poor. If Mr. Gore really believes global warming is the defining issue of our time, the greatest threat human civilization has ever faced, and then he should welcome the opportunity to raise the profile of the issue before a worldwide audience of billions by defining and defending his claims against a serious, science-based challenge”. [end of quote]

My guess is that Al Gore will decline the invitation. He has so far been reluctant to debate, declining the opportunity to go head-to-head with the skeptical environmentalist, Bjorn Lomborg, when he visited Denmark last year.

Monckton ended his invitation with “May the truth win! Magna est veritas, et praevalent“.

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** You can read a 79 page transcript of the New York debate at http://www.crichton-official.com/GlobalWarmingDebate.pdf

Warm Start to This Year

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The global December 2006 to February 2007 land surface temperature was the warmest on record according to NOAA.

But Melbourne’s The Age newspaper was wrong to suggest this means the planet is “hotter than ever”!

There is some dispute as to whether the planet was warmer than it is now during the medieval warm period (from about the 9th to 14th Century when Greenland was colonised by the Vikings). But I think it is generally agreed that the earth was warmer during the last interglacial warm period which was about 125,000 years ago.

Nevertheless, the warm start to this year does not bode well for the two Russian climate change skeptics who have bet US$10,000 that the earth is going to cool soon. But this year (2007) won’t count. Their bet depends on the period 2012 to 2017 being warmer than the period 1998 to 2003.

temp anomaly dec06-feb07.JPG
Map from NOAA via Luke, added as an update to this blog post on 19th March 2007

More on Australia’s Water Crisis and Climate Change, This Sunday on ‘Sunday’

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I really wanted to walk out of the channel 9 television studio in Sydney last Thursday.

I was there because the ‘Sunday’ program had flown me all the way from Brisbane to be a part of a ‘water forum’ to discuss ‘the water crisis’.

Also there, on the very large forum panel, was federal Environment Minister, Malcolm Turnbull, Shadow Minister for Infrastructure, Anthony Albanese, Wentworth Group Member and Water Commission Commissioner, Professor Peter Cullen, Australian Conservation Foundation Executive Director, Don Henry and the list went on to also include Laurie Arthur from the Rice Growers Association and someone from the Bureau of Meteorology and of course there was Dr Mike Young from CSIRO and a few more.

I almost forgot. They also had Queensland Premier, Peter Beattie, on a video link up from Brisbane.

Before I could get a word in edge ways, Premier Beattie and Professor Cullen with some help from Minister Turnbull and others, had spun the usual story including that due to climate change, the Murray Darling Basin, not to mention the rest of Australia is in the grip of a water crisis.

I don’t dispute that there is a water crisis, but I do dispute that it has much to do with climate change.

Minister Turnbull had also falsely claimed that Australian irrigators are inefficient and need reforming and Don Henry had managed to explain that the Murray River is in ruin. Mr Henry has been making the same claim over and over for about 10 years.

I had naïvely thought it wouldn’t unravel as such.

It was, after all, only last year that ‘Sunday’ ran a feature story on the Murray River explaining that there was no environmental crisis and no salinity crisis. One of their film crews had traveled the length of the river with Ross Coulthart uncovering the extent of the ‘honesty crisis’ – as I described it at the time.

Just a few weeks ago, in advance of the water forum, I had sent more information through to channel 9 explaining that despite all the more recent hype, the river is still doing OK. I also sent them through Bureau of Meteorology graphs, including a graph showing that there has not been a gradual long-term decline in rainfall in the Murray Darling Basin, as is so often repeatedly and falsely suggested in the mainstream media.

rainfall06_bom_summary 2.JPG

But this time most of the evidence was just ignored.

The shows host, Ellen Fanning, let Professor Cullen and others repeatedly confuse inflows with rainfall, drought with climate change and suggest the new $10 billion National Plan for Water Security could solve “the water crisis”.

While Ellen was in complete control of where the cameras were pointing when, I did manage to make a few points in response to Premier Beattie’s claim that southeast Queensland’s water crisis was the fault of climate change and wait for it, local government, and I also managed to correct Professor Cullen when he suggested there was a direct link between the 30 percent increase in global levels of atmospheric carbon dioxide and the current water crisis.

They filmed for 90 minutes and will edit this down to just 30 minutes. So, my efforts may have all been in vain.

There is ample opportunity, thanks in particular to Professor Cullen and Minister Turnbull, for the program to really hone the doomsayers message that we have a ‘climate crisis’ and that the government’s $10 billion plan can really fix it.

But I’m hopeful, if not optimistic, they might find a spot for some balance.

Anyway, the ‘water forum’ on the ‘water crisis’ should screen this Sunday on ‘Sunday’ some time between 9 and 11 am.

New Website, New Blog, New Photographs: A Note from Neil Hewett

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Hi Jen,

After a torrid month or so of blundering around a web-design application and with the help of the team at Wild Lime Media, we have finally published (and hopefully de-bugged) our new website; complete with a ‘Rainforest Revelations’ weblog.

Now that that’s done, I can return to some semblance of a life. In my absence from your blog, I have captured some interesting images.

The Daintree Cape Tribulation rainforest is at its most vibrant in the wet. Some of its best-kept secrets are revealed in circumstances that are frustratingly uninviting to visitors. Nevertheless, we at Cooper Creek Wilderness carry on with our tours and share the wonder of the wet with a privileged few.

This image of a brush-footed trapdoor spider was captured two nights ago at the entrance to its burrow, deep within the buttress roots of a Javan Ash.

Brush-footed Trapdoo#260290 blog.JPG

Primitive spiders lack trachea and have very limited respiratory capabilities. Their gill-like book-lungs confer a greater proximity to an aqueous pre-existence, than the more modern and mobile Araneomorphs. They are also less able to travel great distances from the protection of their burrows and tend to have more immobilizing venom.

Also known as whistling spiders, barking spiders or Australia’s Tarantulas, they are subject to concerning pressures from collectors who sell them as pets for around $400 each. In an attempt to control these impacts, their trade has become regulated by licencing requirements (I wonder if this is having any success).

The other interesting image is a magnification of a longicorn beetle’s head, Batocera sp., whose family includes Australia’s largest beetle.

Longicorn blog.JPG

Their powerful mandibles rip into timber and their large, white and fleshy larvae are favoured bush-tucker for Cape York bama.

All the best from Cooper Creek Wilderness,

Neil Hewett.