Sex differences but no evidence of quantitative honesty in the warning signals of six-spot burnet moths (Zygaena filipendulae L.)

Evolution; International Journal of Organic Evolution
Emmanuelle Sophie BriolatM Stevens

Abstract

The distinctive black and red wing pattern of six-spot burnet moths (Zygaena filipendulae, L.) is a classic example of aposematism, advertising their potent cyanide-based defences. While such warning signals provide a qualitatively honest signal of unprofitability, the evidence for quantitative honesty, whereby variation in visual traits could provide accurate estimates of individual toxicity, is more equivocal. Combining measures of cyanogenic glucoside content and wing color from the perspective of avian predators, we investigate the relationship between coloration and defences in Z. filipendulae, to test signal honesty both within and across populations. There were no significant relationships between mean cyanogenic glucoside concentration and metrics of wing coloration across populations in males, yet in females higher cyanogenic glucoside levels were associated with smaller and lighter red forewing markings. Trends within populations were similarly inconsistent with quantitative honesty, and persistent differences between the sexes were apparent: larger females, carrying a greater total cyanogenic glucoside load, displayed larger but less conspicuous markings than smaller males, according to several color metrics. The ove...Continue Reading

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Citations

Jun 20, 2018·Evolution; International Journal of Organic Evolution·Jordan Greer
Oct 15, 2018·Journal of Evolutionary Biology·Emmanuelle S BriolatMartin Stevens
Aug 29, 2018·Biological Reviews of the Cambridge Philosophical Society·Emmanuelle S BriolatAdam M M Stuckert
May 13, 2018·Insects·Mika ZagrobelnySøren Bak
Apr 29, 2021·Proceedings. Biological Sciences·Thomas E White, Kate D L Umbers

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