TY - JOUR
T1 - Cost of reproduction in the Queensland fruit fly
T2 - Y-model versus lethal protein hypothesis
AU - Fanson, Benjamin G.
AU - Fanson, Kerry V.
AU - Taylor, Phillip W.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84869138336&partnerID=8YFLogxK
U2 - 10.1098/rspb.2012.2033
DO - 10.1098/rspb.2012.2033
M3 - Article
C2 - 23097519
AN - SCOPUS:84869138336
SN - 0962-8452
VL - 279
SP - 4893
EP - 4900
JO - Proceedings of the Royal Society B: Biological Sciences
JF - Proceedings of the Royal Society B: Biological Sciences
IS - 1749
ER -