July 22, 2009
Discovery Suggests Trees Evolved Camouflage Defense Against Long Extinct Predator
Many animal species such as snakes, insects and fish have evolved camouflage defenses to deter attack from their predators. However research published in New Phytologist has discovered that trees in New Zealand have evolved a similar defense to protect themselves from extinct giant birds, providing the first evidence of this strategy in plant life.
"Plants are attacked by a bewildering array of herbivores and in response they have evolved a variety of defenses to deter predators such as thorns and noxious chemicals," said lead researcher Dr Kevin Burns from Victoria University of Wellington, New Zealand. "In contrast animals often use colors to hide from predators or advertise defenses, but until now there has been little evidence of color based defenses in plants."
Dr Burns' team studied the leaves of the Araliaceae tree (P. crassifolius) a heteroblastic species which is native to New Zealand. This species goes through several strange color transitions during the process from germination to maturity and the reason for these changes is now thought to be a defense strategy from an extinct predator, the moa.
Before the arrival of humans New Zealand had no native land mammals, but was home to moa, giant flightless birds, closely related to the modern ostrich and the top herbivore predator in the food chain. However moa were hunted to extinction 750 years ago.
The Araliaceae tree has several defenses which the team suggest are linked to the historic presence of moa. Seedlings produce small narrow leaves, which appear mottled to the human eye. Saplings meanwhile produce larger, more elongated leaves with thorn-like dentitions.
The mottled colors of seedling leaves are similar to the appearance of leaf litter, which would have made them difficult for a moa to distinguish. The unusual coloring may also reduce the probability of leaf outlines and help camouflage leaves against the sunlight-draped forest 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 color, lacking any defense.
To prove that these defenses were linked to the presence of moa the team compared Araliaceae leaves to samples from a similar species of tree, P chatwamicus, from the Chatham Islands, which are 800 kilometers east of New Zealand. Unlike New Zealand the islands lacked large browsers such as Moa and so the plant life did not evolve a defense against them.
"The Chatham island species displays less morphological changes between adults and juveniles," said Burns. "If these coloring changes developed in response to the presence of moa in New Zealand they are reduced when they have evolved in the absence of moa."
On The Net: