What term describes the bright yellow coloration of A. nerii when used as a warning signal to predators?

Answer

Aposematic signal

The vivid, bright yellow appearance of the Oleander aphid serves a crucial ecological purpose beyond mere identification; it acts as a direct warning advertisement to potential predators regarding the aphid's toxicity. In biology, a conspicuous coloration that signals the unpalatability or toxicity of an organism is termed an aposematic signal. This warning is effective because the aphids have sequestered cardenolide glycosides from their host plants. Furthermore, the aphid reinforces this signal by incorporating these bitter chemicals into its honeydew excretion. While this defense deters some generalist predators, it is important to note that highly specialized parasitoids or certain generalist enemies may still attack the advertised toxic prey.

What term describes the bright yellow coloration of A. nerii when used as a warning signal to predators?

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