Parental phenotype not predator cues influence egg warning coloration and defence levels

A - Papers appearing in refereed journals

Birkett, M. A., Paul, S., Stevens, M., Burton, J., Pell, J. K. and Blount, J. D. 2018. Parental phenotype not predator cues influence egg warning coloration and defence levels. Animal Behaviour. 140 (June), pp. 177-186.

AuthorsBirkett, M. A., Paul, S., Stevens, M., Burton, J., Pell, J. K. and Blount, J. D.
Abstract

In species that advertise their toxicity to predators through visual signals, there is considerable variation among individuals in both signal appearance and levels of defence. Parental effects, a type of non-genetic inheritance, may play a key role in creating and maintaining this within-species diversity in aposematic signals, however a comprehensive test of this notion is lacking. Using the ladybird Adalia bipunctata we assess how egg coloration and defence level (concentration of the toxic alkaloid (-)-adaline) is influenced both by simulated predation risk in the egg laying environment, and by parental phenotype (coloration and toxin level). We found that egg toxin level and colour were predicted by parental phenotype, but were not altered in response to cues of egg predators. Egg luminance (lightness) was positively correlated with paternal elytral luminance, whilst maternal toxin level positively predicted egg toxin level. In response to egg predator cues, ladybird mothers altered the timing of laying and total egg number, but not egg toxin level or colour. It appears therefore that in A. bipunctata variation between individuals of the same morph in the colour and toxin level of the eggs they lay, i.e. egg aposematic phenotype, is more strongly influenced by individual variation in parental aposematic traits than environmental cues of egg predation risk. Furthermore, these results provide the first indication that, in a warningly coloured species, male coloration may play a dual role as predator deterrent and indicator of paternal quality, influencing maternal investment in offspring.

KeywordsParental effects; Maternal effects; Paternal effects; Differential allocation; Warning colour variation; Aposematism
Year of Publication2018
JournalAnimal Behaviour
Journal citation140 (June), pp. 177-186
Digital Object Identifier (DOI)doi:10.1016/j.anbehav.2018.04.014
Open accessPublished as ‘gold’ (paid) open access
Funder project or codeBBSRC Strategic Programme in Smart Crop Protection
FunderBiotechnology and Biological Sciences Research Council
Accepted author manuscriptAnimalBehaviourPaper.docx
Output statusPublished
Publication dates
Online26 May 2018
Publication process dates
Accepted07 Mar 2018
Copyright licenseCC BY
PublisherAcademic Press Ltd- Elsevier Science Ltd
ISSN0003-3472

Permalink - https://repository.rothamsted.ac.uk/item/8472x/parental-phenotype-not-predator-cues-influence-egg-warning-coloration-and-defence-levels

Total views: 3

Total downloads: 11

Views this month: 1

Downloads this month: 1