Mimicry
Mimicry in insects covers a variety of
auditory, olfactory, or visual behaviors which serve to camouflage or advance
some other deceptive or defensive behavior.
So, the mimetic species may sound-like, smell-like or look-like its
model.
Henry W. Bates, the British naturalist of the
Amazon, first wrote in 1862 about mimics among palatable and unpalatable
species, saying: "I never saw the flocks of slow-flying Heliconidae in the
woods persecuted by birds or dragonflies... nor when at rest did they appear to
be molested by lizards, or predacious flies of the family Asilidae
[robber-flies] which were very often seen pouncing on butterflies of other
families... In contrast, the Pieridae (sulfur butterflies), to
which Leptalis
belongs [now called Dismorphia]
are much persecuted." This quote identifies
a visual mimicry where an edible species mimics a less edible or inedible
species (Barrows, 2001). The theory is
called Batesian or cryptic mimicry and classically refers to situations where
the mimetic does not outnumber its model; by contrast to Waldbauerian-Batesian
mimicry, “in which a mimetic species is sympatric [“occupying the same
geographical range without loss of identity from interbreeding,” according to M-W
Online Dictionary] with its model but is more frequent that it earlier
during the warm season,” according to Barrows (2001). Also, there is Browerian automimicry where
“conspecific [i.e., the same] species mimic each other (e.g., in Monarch
Butterflies, individuals that are more palatable look like individuals that are
less palatable),” according to Barrows (2001).
Somewhat later, Dr. Johann Friedrich Theodor (“Fritz”)
Müller, the German biologist who immigrated to southern Brazil, observed [see “Ueber die Vortheile der Mimicry bei Schmetterlingen,”Zoologischer Anzeiger
1 (1878): 54-55] a situation “in which both mimic and model are unpalatable for
all potential predators;” but Mllerian mimicry is also used
today in the sense of “mimicry between, or among, two or more distasteful, or
toxic, species that reduces predation for each species because, in this
resemblance situation, predators learn to avoid only one color pattern rather
than several,” according to Barrows (2001).
Pasteur (1985) has argued that strictly speaking, “Müllerian mimicry is
not mimicry because both model and mimic are sending non-deceitful signals to a
perceiver.”
In any event, the advantage of mimicry is that
one species potentially survives longer by using less energy.
REFERENCES:
Edward M. Barrows, Animal Behavior Desk
Reference: A Dictionary of Animal, Ecology and Evolution, 2nd ed. Boca Raton, FL:
CRC Press, 2001, p. 442 and 445.
G. D. H. Carpenter and E.
B. Ford.
Mimicry. London: Methuen, 1933.
Georges Pasteur, “A Classificatory Review of
Mimicry Systems,” Annual Review of Ecology and Systematics 13 (November
1985), p. 185.