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kadal Christmas colors
disguise gliding lizards di hutan hujan
Dengan meniru warna merah dan hijaunya
daun , kadal Kalimantan meluncur menghindar menjadi mangsa burung sementara....read more
Christmas colors
disguise gliding lizards in the rainforest
Date:
December 24, 2014
Source:
University of
Melbourne
Summary:
By mimicking the red
and green colors of falling leaves, Bornean lizards avoid falling prey to birds
whilst gliding, new research has found.
............
By mimicking the red and green colours of falling
leaves, Bornean lizards avoid falling prey to birds whilst gliding, new
research has found.
The work suggests that populations of the gliding lizard, Draco
cornutus, have evolved extendable gliding membranes, like wings, which
closely match the colours of falling leaves to disguise themselves as they
glide between trees in the rainforest.
Found throughout South-East Asia, Draco is the only living genus of lizard
with extendable gliding membranes -- call patagia -- which allow them to glide
between trees in their territories.
Published Dec. 24 in the international journal Biology Letters,
the study was conducted by PhD student Ms Danielle Klomp, based at both the
University of Melbourne and the University of New South Wales with supervisors
Dr Terry Ord and Dr Devi Stuart-Fox and collaborator Dr Indraneil Das from the
University of Malaysia.
The team travelled to Borneo and observed two populations of a gliding
lizard that have different coloured gliding membranes and occupy very different
habitats.
One population has red gliding membranes, which match the colour of the red
falling leaves of their coastal mangrove forest habitat. The other population
has dark brown and green gliding membranes, which match the colours of falling
leaves in their lowland rainforest habitat.
They determined how the colours would be perceived by a predatory bird and
found that the gliding membrane colour would be indistinguishable from a
falling leaf in the same forest.
Birds can see ultraviolet light as well as the colours that humans see, so
it is important to take into account how closely the colours would actually
match to a bird, Ms Klomp said.
"It's a cool finding because these gliding lizards are matching the
colours of falling leaves and not the leaves that are still attached to the
tree. In the mangrove population the leaves on the trees are bright green, but
turn red shortly before falling to the ground, and it is this red colour that
the lizards mimic in their gliding membranes. This allows them to mimic a
moving part of the environment- falling leaves -- when they are gliding."
Ms Klomp said.
Because some animals have developed colour not only for camouflage, but
also as a form of communication, we also wanted to watch the lizards interact
in the wild and determine whether their gliding membranes were used for
communication as well as gliding said Ms Klomp.
The team filmed hours of gliding lizard behaviour to observe how often the
colours were displayed to other lizards.
"We found that both the red and green/brown gliding membranes seem to
have evolved to specifically resemble the falling leaves in each population's
particular habitat, and are rarely used for communication," Ms Klomp said.
"Perhaps these populations may have originally had the same gliding
membrane colours but as they have moved into different forest types their
colours have adapted to closely resemble the colours of falling leaves in the
different forests, known as divergent evolution."
Story Source:
The above story is based on materials provided by University of Melbourne. Note: Materials may be edited
for content and length.
Journal Reference:
1. D. A. Klomp, D. Stuart-Fox, I. Das, T.
J. Ord. Marked colour divergence in the gliding membranes of a tropical
lizard mirrors population differences in the colour of falling leaves. Biology
Letters, 2014; 10 (12): 20140776 DOI:10.1098/rsbl.2014.0776
