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Sex allocation theory reveals a hidden cost of neonicotinoid exposure in a parasitoid wasp

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Author(s)

Penelope R. Whitehorn, Nicola Cook, Charlotte V. Blackburn, Sophie M. Gill, Jade Green, David M. Shuker

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Abstract

Sex allocation theory has proved to be one the most successful theories in evolutionary ecology. However, its role in more applied aspects of ecology has been limited. Here we show how sex allocation theory helps uncover an otherwise hidden cost of neonicotinoid exposure in the parasitoid wasp Nasonia vitripennis. Female N. vitripennis allocate the sex of their offspring in line with Local Mate Competition (LMC) theory. Neonicotinoids are an economically important class of insecticides, but their deployment remains controversial, with evidence linking them to the decline of beneficial species. We demonstrate for the first time to our knowledge, that neonicotinoids disrupt the crucial reproductive behaviour of facultative sex allocation at sub-lethal, field-relevant doses in N. vitripennis. The quantitative predictions we can make from LMC theory show that females exposed to neonicotinoids are less able to allocate sex optimally and that this failure imposes a significant fitness cost. Our work highlights that understanding the ecological consequences of neonicotinoid deployment requires not just measures of mortality or even fecundity reduction among non-target species, but also measures that capture broader fitness costs, in this case offspring sex allocation. Our work also highlights new avenues for exploring how females obtain information when allocating sex under LMC.

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Details

Original languageEnglish
Article number20150389
Number of pages6
JournalProceedings of the Royal Society B: Biological Sciences
Volume282
Issue number1807
Early online date29 Apr 2015
DOIs
Publication statusPublished - May 2015

    Research areas

  • Systemic insecticide, Beneficial insects, Sex ratio

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