Mimicry - Batesian Mimicry, Müllerian Mimicry, Aggressive Mimicry
Mimicry may broadly be defined as imitation or copying of an action or image. In biological systems, mimicry specifically refers to the fascinating resemblance of an organism, called the "mimic," to another somewhat distantly related organism, called the "model." The set of mimic and model species involved is often referred to as a mimicry complex. Usually through escape from predation, the mimicry of a trait or traits helps the mimic to survive. This, coupled with the fact that the resemblance traits are genetically based, implies that mimicry complexes have been shaped by natural selection. There are two major types of mimicry, Batesian and Müllerian, named after the naturalists that first theorized them upon their observations of butterflies. There are a few other types that are not as prevalent, such as aggressive mimicry.
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In 1862, H.W. Bates presented an hypothesis explaining the similar color patterns in several species sets of tropical butterflies in different families. His hypothesis was one of the early applications of Charles Darwin's theory of natural selection. Bates reasoned that an edible butterfly species that was susceptible to predation would evolve, due to selection by a bird predator, to look l…
In the 1870s, Fritz Müller theorized a different type of mimicry. His idea, also based on sets of butterfly species, was that several species, all somewhat distasteful, would evolve to look like each other. Such an evolutionary strategy would, in effect, reduce predation on any of the species because the predator would learn to avoid a single color pattern, but since all of them had the sam…
A less common but equally fascinating type of mimicry involves not only a model and a mimic, but a "dupe" species that is tricked by the mimicry. In the previously noted types of mimicry, the dupe is the predator who is tricked out of a potential food source, but in aggressive mimicry, the word is especially appropriate as being duped is lethal. In aggressive mimicry, the mimic is a …
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