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Cost of reproduction in the Queensland fruit fly: Y-model versus lethal protein hypothesis

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journal contribution
posted on 2012-01-01, 00:00 authored by Benjamin Fanson, Kerry FansonKerry Fanson, P Taylor
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.

History

Journal

Proceedings of the Royal Society B: Biological Sciences

Volume

279

Pagination

4893 - 4900

Location

London, UK

Open access

  • Yes

ISSN

0962-8452

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2012, Royal Society Publishing