Cost of reproduction in the Queensland fruit fly

Y-model versus lethal protein hypothesis

Benjamin G. Fanson, Kerry V. Fanson, Phillip W. Taylor

Research output: Contribution to journalArticle

29 Citations (Scopus)


The trade-off between lifespan and reproduction is commonly explained by differential allocation of limited resources. Recent research has shown that the ratio of protein to carbohydrate (P: C) of a fly's diet mediates the lifespan-reproduction trade-off, with higher P: C diets increasing egg production but decreasing lifespan. To test whether this P: C effect is because of changing allocation strategies (Y-model hypothesis) or detrimental effects of protein ingestion on lifespan (lethal protein hypothesis), we measured lifespan and egg production in Queensland fruit flies varying in reproductive status (mated, virgin and sterilized females, virgin males) that were fed one of 18 diets varying in protein and carbohydrate amounts. The Y-model predicts that for sterilized females and for males, which require little protein for reproduction, there will be no effect of P: C ratio on lifespan; the lethal protein hypothesis predicts that the effect of P: C ratio should be similar in all groups. In support of the lethal protein hypothesis, and counter to the Y-model, the P: C ratio of the ingested diets had similar effects for all groups. We conclude that the trade-off between lifespan and reproduction is mediated by the detrimental side-effects of protein ingestion on lifespan.

Original languageEnglish
Pages (from-to)4893-4900
Number of pages8
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1749
Publication statusPublished - 2012

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