Brontosaurs-a-chomping: The constant eating by herds of sauropods like these no doubt produced a constant flow of methane into the atmosphere.
Brontosaurs-a-chomping: The constant eating by herds of sauropods like these no doubt produced a constant flow of methane into the atmosphere.Courtesy Public domain
Imagine you’ve been transported back in time to the Late Jurassic and you’re sitting on a gently sloping hillside watching a large herd of the gigantic sauropod dinosaurs chowing down on tons of vegetation in the valley below. What’s the one thing you might need to worry about? The herd of sauropods suddenly stampeding the hillside? A truck-sized carnivore eyeing you from the shadows? Tiny burrowing mammals gnawing at your ankles? While all these scenarios would have been possible, the most likely worry would probably be (if you’re downwind anyway) getting inundated by a warm blast of dinosaur farts.

That’s right, dinosaur flatulence - tons of it - wafting over you like a huge, stinky old blanket. Ewww.

Researchers from Liverpool John Moore's University, the University of London, and the University of Glasgow have calculated that herds of sauropods, those tiny-headed ,long-necked, long-tailed herbivorous dinosaurs that populated the Jurassic landscape about 150 million years ago, would have been eating a lot of vegetation during their lifetimes and in the process releasing a tremendous amount of methane gas from their guts and into the Earth’s atmosphere. That's a lot of cheese-cutting.

In fact, writing in the journal Current Biology, Dr. David Wilkinson and his colleagues claimed that the amount of emission of methane just from the herbivorous dinosaur gassers would have been about the same amount being emitted from all sources today - 500-520 million tons each year. Methane is a greenhouse gas that can absorb the sun’s infrared energy, and heat up the atmosphere. The producers of methane today range from ruminant species such as cows, goats, and sheep, and from human activities such as natural gas drilling, but the effects on the environment could be similar – a warming of the atmosphere. Back in the Mesozoic, average temperatures were about 18 °F higher than today. Wilkinson and his colleagues suggest the dinosaur backfires could have been a big factor in the warming of the prehistoric environment, but admit it wouldn't have been the only source of the gas back then.

"There were other sources of methane in the Mesozoic so total methane level would probably have been much higher than now," Wilkinson said.

Wilkinson’s research interest lays not so much in the sauropods themselves but in the microscopic bacteria that once lined their guts. It was these microbes that converted the vegetable matter into energy and waste, including methane. Could that vast SBD Mesozoic methane source, as the researchers suggest, have been a big contributor to the warmer temperatures back then? Possibly. Or maybe it's just a lot of hot air.

BBC Nature News

Your Comments, Thoughts, Questions, Ideas

Jerzy Trammer, Warsaw University, Poland's picture
Jerzy Trammer, Warsaw University, Poland says:

The hipothesis of Wilkinson and his co-authors is likely but the amount of methane emited by dinosaurs is clearly overestimated: e. g. for the Late Jurassic time 1.5 to 5 times - if dinosaurs had a mammalian like metabolism, and as many as 7 to 20 times - if they had a reptilian-type metabolism.

posted on Sat, 05/26/2012 - 4:04pm

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