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Batesian mimicry
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  1. References
  2. mimicry - Dictionary Definition : jabidajyzu.tk
  3. Related Subjects

  • The evolution of mimicry.
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When the receiver is known and its reactions understood, however, the distinction is quite clear: in mimicry the signals have a special significance for the receiver and for the sender, which has evolved the signals in order to be perceived by the receiver; in camouflage the sender seeks to avoid detection by the receiver through imitation of what is neutral background to the receiver. For information on camouflage, see also coloration: Camouflage.

In the English naturalist Henry W. Bates published an explanation for unexpected similarities in appearance between certain Brazilian forest butterflies of two distinct families. Members of one family, the Heliconiidae, are unpalatable to birds and are conspicuously coloured; members of the other family, the Pieridae , are edible to predators.

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Bates concluded that the conspicuous coloration of the inedible species must serve as a warning for predators that had learned of their inedibility through experience. The deceptively similar colour patterns of the edible species would provide protection from the same predators.

References

This form of mimicry, in which a defenseless organism bears a close resemblance to a noxious and conspicuous one, is called Batesian , in honour of its discoverer. Mimicry biology.

Basic types of mimicry

Written By: Wolfgang J. See Article History. Read More on This Topic. A different kind of convergence has occurred in the evolution of mimetic butterflies and other insects. Mimicry occurs…. Start your free trial today for unlimited access to Britannica. Load Next Page. Additional Reading. Although a test bird would occasionally peck at a model, then reject it, the same action was sometimes shown to a mimic that it had picked up, suggesting that a premature response had been subsequently corrected.

Analysis and understanding of a given mimicry system require a rather comprehensive knowledge of morphology , behaviour, ecology , and mutual relationships of animals usually in different classes—for example, wasps Hymenoptera , flies Diptera , insect-eating amphibians , reptiles , birds , and small mammals. Tracing the evolution of such a complicated system requires a detailed acquaintance with a large group of forms related to each of the animals involved. Such data, in fact, are seldom available.

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mimicry - Dictionary Definition : jabidajyzu.tk

Reconstructing the evolution of a case of mimicry within the same species , however, is relatively simple, requiring detailed knowledge of but one rather narrow taxonomic unit. Such a reconstruction is valuable, because mimicry is an indispensable tool in the study of the evolution of animal communication , and usually starts from conspicuously elaborated signals, which postulate a signal receiver interested in them.

The receiver practically always has undergone a special molding toward optimal receiving of the signal. The mutual adaptations of the sender and the receiver must be examined separately. This examination is easily made, so far as the evolution of a reaction or of a receiving mechanism is concerned, in all predators trying to find their prey and in all prey animals attempting to escape an approaching predator. The suppression of signals may be studied in predators trying to sneak up on a prey unnoticed.

The elaboration of a signal, which must, of course, be important to the receiver, can only be studied after consideration of compensatory adaptations in the receiver and in situations where the sender has a one-sided interest in the signal.


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The deceiving signal can be derived only from one of two types: a signal developed by the receiver and another signal sender in their common interest or a signal emitted by another signal sender and made use of by the receiver only in its own interest. Both cases, by the definition given above, are called mimicry.

An additional advantage is that the model is known to be the final stage toward which the mimic will evolve so far as the signal characters are concerned , thus indicating a trend in evolution that is still operating and that probably over time will further elaborate the mimetic signals.

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If the female Haplochromis fish were to discriminate between real eggs and the egg dummies of the male and were to stop reacting toward the latter, her eggs would remain unfertilized. In such cases of deceptive signals developed within the same species, natural selection operates against better signal discrimination on the part of the signal receiver. Fundamental characteristics of mimicry are determined mainly by behavioral properties of the signal receiver.

A precise knowledge of the identity of the receiver and a thorough study of its behaviour are therefore indispensable for the understanding of mimicry. Moreover, mimicry gradually merges into other sender—receiver systems. Because, however, the male wasps have no protective properties but retain their group-specific warning coloration, this is Batesian mimicry , although model and mimic are of the same species and their signals homologous evolved from the same source.

An insect may be protectively coloured to resemble, for example, a wasp or a twig.

In the first case the coloration is called mimicry, in the second, mimesis, or protective coloration. The difference lies within the signal receiver.


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If the mimetic signal does not release any reaction in the receiver, the mimic is said to exhibit mimesis. This distinction is illustrated by the experiments of the Dutch biologist L.