Abstracts (first author)

Poster 

Why do the well-fed die young? An eco-evolutionary perspective on the effects of dietary restriction

Author(s): Adler MI, Bonduriansky R

Summary:

The phylogenetically conserved life-history responses to dietary restriction (DR) – lifespan extension and reduced fecundity – have long been thought to reflect an adaptive survival mode whereby resources are redirected from reproduction to somatic maintenance and repair, enabling organisms to weather periods of resource scarcity. We argue that this interpretation of DR’s effects is both inconsistent with recent experimental evidence and at odds with the ecology of natural populations. Laboratory studies have shown that high nutrient intake stimulates nutrient-sensing pathways that enhance reproduction as well as the ability to respond to environmental challenges, but impose latent costs -- increased rates of cellular damage and aging – that reduce survival in the lab. However, relative to laboratory organisms, natural populations subject to high extrinsic mortality rates are far less likely to reap the survival benefits associated with DR, or to pay the fitness costs associated with full-feeding. We suggest that DR’s effects are best understood as the corollary of an ancient and highly-conserved strategy that allows organisms to take advantage of periods of resource abundance.



Contacts

Chairman: Octávio S. Paulo
Tel: 00 351 217500614 direct
Tel: 00 351 217500000 ext22359
Fax: 00 351 217500028
email: mail@eseb2013.com

Address

XIV Congress of the European Society for Evolutionary Biology

Organization Team
Department of Animal Biology (DBA)
Faculty of Sciences of the University of Lisbon
P-1749-016 Lisbon
Portugal

Website

Computational Biology & Population Genomics Group 
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