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New discovery suggests trees evolved camouflage defense against long extinct predator
Date:7/22/2009

est floor.

Moa also lacked teeth and swallowed leaves by placing them in their bills and snapping their head forward. The long rigid leaves produced by P. crassifolius would have been difficult for a moa to swallow. The maximum browsing height of the largest known moa was approximately 300cm and once P. crassifolius grow above this height they produce leaves that are ordinary in size, shape and colour, lacking any defence.

To prove that these defences were linked to the presence of moa the team compared Araliaceae leaves to samples from a similar species of tree, P chathamicus, from the Chatham Islands, which are 800 kilometres east of New Zealand. Unlike New Zealand the islands lacked large browsers such as Moa and so the plant life did not evolve a defence against them.

"The Chatham island species displays less morphological changes between adults and juveniles," said Burns. "If these colouring changes developed in response to the presence of moa in New Zealand they are reduced when they have evolved in the absence of moa."


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Contact: Ben Norman
Lifesciencenews@wiley.com
44-124-377-0375
Wiley-Blackwell
Source:Eurekalert

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