Dinosaurs may have experienced less gravitational pull as a result 21.9hour day

Ryan_m_b

Please provide citations from credible sources. You have been asked twice now to back up your claims.
I don't mean to sound offensive but you seem to be very arrogant here. On what basis have you come to a conclusion that you think paleontologists have missed or dismissed out of hand? If you do a journal search you can quickly find papers on sauropod estimated weights and in recent years more on their evolution and how they possibly came to be so big. Even following the wikipedia links would give you something like this
http://www.miketaylor.org.uk/tmp/pap...-body-size.pdf

vendingnick

I am not trying to be arrogant. I send a letter to the Natural History museum outlining my concerns about the weight of dinosaurs . I said that I just found it difficult to belive that craatures this heavy could move about or indeed eat enough to keep going. I received a quiet curt reply stating the larger creatures supported their weight by spending most of their time in water, They were able to process large amounts of vegetation for food because they had a mill located in their neck so they could breakdown food quickly. when i replied voicing my doubts the Museum refused to enter into any more correspondance.
The Conspiracy theory is that bigger monsters get more visitors through museum doors

Ryan_m_b

I advise you read this and this carefully and in future read published papers and books from scientists within the field so that you can understand why they conclude the things they do rather than dismissing them out of hand.

vendingnick

This was the original article From The University of Manchester

Dinosaurs lighter than previously thought

06 Jun 2012

Scientists have developed a new technique to accurately measure the weight and size of dinosaurs and discovered they are not as heavy as previously thought.
University of Manchester biologists used lasers to measure the minimum amount of skin required to wrap around the skeletons of modern-day mammals, including reindeer, polar bears, giraffes and elephants.

They discovered that the animals had almost exactly 21% more body mass than the minimum skeletal ‘skin and bone’ wrap volume, and applied this to a giant Brachiosaur skeleton in Berlin’s Museum für Naturkunde.

Previous estimates of this Brachiosaur's weight have varied, with estimates as high as 80 tonnes, but the Manchester team’s calculations – published in the journal Biology Letters – reduced that figure to just 23 tonnes. The team says the new technique will apply to all dinosaur weight measurements.

Lead author Dr Bill Sellers said: "One of the most important things palaeobiologists need to know about fossilised animals is how much they weighed. This is surprisingly difficult, so we have been testing a new approach. We laser scanned various large mammal skeletons, including polar bear, giraffe and elephant, and calculated the minimum wrapping volume of the main skeletal sections.

“We showed that the actual volume is reliably 21% more than this value, so we then laser scanned the Berlin Brachiosaur, Giraffatitan brancai, calculating the skin and bone wrapping volume and added 21%. We found that the giant herbivore weighed 23 tonnes, supporting the view that these animals were much lighter than traditionally thought.

Dr Sellers, based in Manchester’s Faculty of Life Sciences, explained that body mass was a critical parameter used to constrain biomechanical and physiological traits of organisms.

He said: “Volumetric methods are becoming more common as techniques for estimating the body masses of fossil vertebrates but they are often accused of excessive subjective input when estimating the thickness of missing soft tissue.

“Here, we demonstrate an alternative approach where a minimum convex hull is derived mathematically from the point cloud generated by laser-scanning mounted skeletons. This has the advantage of requiring minimal user intervention and is therefore more objective and far quicker.

“We tested this method on 14 large-bodied mammalian skeletons and demonstrated that it consistently underestimated body mass by 21%. We suggest that this is a robust method of estimating body mass where a mounted skeletal reconstruction is available and demonstrate its usage to predict the body mass of one of the largest, relatively complete sauropod dinosaurs, Giraffatitan brancai, as 23,200 kg.

“The value we got for Giraffatitan is at the low range of previous estimates; although it is still huge, some of the enormous estimates of the past – 80 tonnes in 1962 – are exaggerated. Our method provides a much more accurate measure and shows dinosaurs, while still huge, are not as big as previously thought.”

Ends



Notes for editors
A copy of the paper is available on request.

Images also available at http://130.88.90.147/~wis/bm/

For further information contact:

Aeron Haworth
Media Relations
Faculty of Life Sciences
The University of Manchester

Mob: +44 (0)7717 881563
Email: aeron.haworth@manchester.ac.uk