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Text and photographs
protected by Copyright © Adrian Hoskins
2007, and must not be published
in part or in whole elsewhere without prior written permission from the
author.
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Strategies for
Survival
PAGE 2
Butterflies
occur in an incredible variety of sizes, shapes, colours and
patterns. Each design serves a dual role. Firstly it must act as a
"badge", identifying the butterfly to potential mates.
Secondly, and perhaps more importantly,
it must function to protect the butterfly from predators, either by
using camouflage, warning coloration, mimicry or transparency.
PAGE 1 - MATE RECOGNITION
PAGE 2 - CAMOUFLAGE and
DISGUISE
PAGE 3 - APOSEMATIC
COLOURATION
PAGE 4
- MIMICRY
PAGE 5
- SEXUAL DIMORPHISM
PAGE 6 - ROOSTING BEHAVIOUR
Camouflage and Disguise
cryptic
patterns, disguise and transparency to conceal butterflies from
predators
Green hairstreak
Callophrys rubi
at rest on green foliage.
Butterflies use many means to hide themselves from predators. Sometimes, as with the neotropical metalmarks ( Riodinidae ), they simply hide under leaves, out of sight. Most other species rest in more open situations though, and conceal themselves using techniques such as camouflage, disguise or disruptive coloration. The boundary between camouflage and disguise is hard to define, but camouflage is generally considered to describe something with a colour, pattern and texture that enables it to blend well against a natural background or substrate. Butterflies rest on many different substrates including foliage, soil, rocks and tree trunks - and various species possess colours and patterns which match each of these backgrounds. Disguise on the other hand describes a butterfly or moth that has a similar appearance to another natural object, such as a leaf or flower. Moths often have very effective disguises - some which rest on tree trunks resemble bits of lichen, others resemble bits of broken twig. The caterpillars of many Geometrid moths look exactly like twigs, and even have small projecting false "thorns".Camouflage Amongst British butterflies the Orange tip Anthocharis cardamines is a good example, difficult to spot when at rest on the white flowers of garlic mustard.
Orange tip
Anthocharis cardamines,
well
camouflaged at rest on garlic mustard flowers.
Disguise The Brimstone Gonepteryx rhamni, is a superb example of disguise, being coloured and shaped like a living leaf, complete with raised "veins".
Brimstone Gonepteryx rhamni,
perfectly disguised as a leaf.
In the tropics there are many
species which are disguised as dead brown leaves - examples
include the Leaf butterfly
Kallima inachus
from India, and the
Memphis
and Marpesia Leafwing butterflies of
South America.
Marpesia furcula,
a Peruvian species convincingly disguised as a dead leaf.
Disruptive coloration This term is used to describe the way in which a butterfly or moth's appearance is visually broken up, usually by means of mottling and / or prominent lines. The Angle Shades moth Phlogophora meticulosa is a good example - it is equally well concealed when settled amongst dead vegetation or fallen branches. Predators - particularly birds, use a "search image" to locate resting moths. They look out for a "moth shaped" object, but the disruptive pattern of the Angle Shades breaks up it's outline and foils the bird's search image.
Angle Shades
moth Phlogophora meticulosa, Hampshire, England.
Hylephila
peruana,
a skipper from Peru. The disruptive patterning makes it very
difficult to detect amongst the dry grasslands of it's habitat in
the Andes.
Grayling
Hipparchia semele, perfectly disguised at rest on
dead wood
Transparency
The colours of
butterflies are produced by pigments in the wings scales, and
sometimes structurally, by light refracting on prism-like ridges on
the surface of the scales. Some species however are very thinly
scaled, or lack wing scales almost entirely, revealing the
transparent membrane of the wings.
Butterflies which
use transparency to conceal themselves include the Ithomiine Glasswings and certain neotropical
Satyrines such as Cithaerias pireta and
Dulcedo polita.
There are representatives from other families as well, e.g. the
Chorinea
metalmarks ( Riodinidae ) of South America, and the
Lamproptera
dragontails
( Papilionidae ) of Malaysia.
Cithaerias
pireta aurora, Manu Biosphere Reserve, Peru
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Related subjects :
Taxonomy -
the classification and characteristics of butterfly families and
sub-families.
Lifecycle -
egg, caterpillar, chrysalis, adult butterfly, courtship,
reproduction.
Parasitoids and Predators - of eggs, larvae, pupae and adult
butterflies.
Text and butterfly photographs protected by Copyright © Adrian
Hoskins 2007-2008, and must not be reproduced or published in part
or in whole elsewhere in any form without written permission from
Adrian Hoskins. Breach of copyright will be pursued by litigation.
Website designed, produced and owned by
Adrian Hoskins
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