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    Energetic and fitness costs of mismatching resource supply and demand in seasonally breeding birds (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-03
    Description: By advancing spring leaf flush and ensuing food availability, climatic warming results in a mismatch between the timing of peak food supply and nestling demand, shifting the optimal time for reproduction in birds. Two populations of blue tits (Parus caeruleus) that breed at different dates in similar, but spatially distinct, habitat types in Corsica and southern France provide a unique opportunity to quantify the energetic and fitness consequences when breeding is mismatched with local productivity. As food supply and demand become progressively mismatched, the increased cost of rearing young pushes the metabolic effort of adults beyond their apparent sustainable limit, drastically reducing the persistence of adults in the breeding population. We provide evidence that the economics of parental foraging and limits to sustainable metabolic effort are key selective forces underlying synchronized seasonal breeding and long-term shifts in breeding date in response to climatic change.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thomas, D W -- Blondel, J -- Perret, P -- Lambrechts, M M -- Speakman, J R -- New York, N.Y. -- Science. 2001 Mar 30;291(5513):2598-600.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Groupe de Recherche en Ecologie, Nutrition et Energetique, Departement de Biologie, Universite de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada. d.thomas@courrier.usherb.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11283370" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Animals ; Climate ; *Energy Metabolism ; Feeding Behavior ; Female ; *Food ; France ; Male ; *Nesting Behavior ; *Reproduction ; Seasons ; Songbirds/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    FTO effect on energy demand versus food intake (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-04-03
    Description: An intronic single nucleotide polymorphism (SNP) (rs9939609) close to the fat mass and obesity associated gene (FTO) was the first SNP to be discovered with common variants linked to body mass index; at least seven studies in humans have implicated this SNP with variations in food intake and satiety, and four studies have rejected an effect on energy expenditure normalized for body weight. Fischer et al. recently constructed a mouse in which the homologous Fto gene was inactivated (Fto(-/-)) and showed that these mice were protected from obesity. This observation strongly implicates the effects of the intronic SNP rs9939609 as arising due to an effect on the closest gene (FTO). However, the suggested mechanism underlying this effect in mice was opposite to that in humans. The Fto(-/-) mice showed no significant differences in food intake relative to wild-types litter-mates but had an elevated metabolic rate. The apparent contrasting effects of the gene in humans and mice is worthy of closer investigation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Speakman, John R -- England -- Nature. 2010 Apr 1;464(7289):E1; discussion E2. doi: 10.1038/nature08807.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, UK. j.speakman@abdn.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20360686" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Eating/genetics/*physiology ; Energy Intake/genetics/physiology ; Energy Metabolism/genetics/*physiology ; Female ; Humans ; Hyperphagia/genetics ; Introns/genetics ; Male ; Mice ; Mixed Function Oxygenases ; Obesity/genetics ; Oxo-Acid-Lyases/deficiency/genetics/*metabolism ; Polymorphism, Single Nucleotide/genetics ; Proteins/genetics/*metabolism ; Thinness/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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