... urea and employ compensatory nitrogen conservation strategies such as reduced urea and ammonia excretion. We hypothesized that the elasmobranch gut microbiome transforms dietary and recycled nutrients into amino acids, supporting host carbon and nitrogen balance. Here, using stable isotope analyses, we...

.... Summary: Birds oxidize more endogenous amino acids under acute water stress, supporting the hypothesis that dehydrated birds catabolize protein to offset water losses by synthesizing endogenous water. Water balance Metabolism Body composition Stable isotopes Birds National Science...

...-1/ Summary: Temperature alters the class of nutrients oxidized and assimilated, and the amount of energy spent for processing a meal in an ectotherm. Gut passage time Metabolic rate Nutrient assimilation Nutrient oxidation Specific dynamic action Stable isotopes...

...Erling S. Nordøy; Anne R. Lager; Pauke C. Schots ABSTRACT The aim of this study was to monitor seasonal changes in stable isotopes of pool freshwater and harp seal ( Phoca groenlandica ) body water, and to study whether these potential seasonal changes might bias results obtained using the doubly...

... and nutrient costs of glucocorticoid-accelerated development alter fitness trade-offs across life stages. Amphibian Life history Trade-off Glucocorticoids Corticosterone Stable isotopes Larval development is shaped by genetic and environmental interactions, and variation in conditions during...

... starvation conditions, adult females exhibit the opposite pattern. Manduca sexta Nutrient use Metabolism Stable isotopes δ 13 C The resource investment of male sperm is considered to be low compared with the large and nutrient-rich oocyte produced by the females ( Parker, 1982 ). This has...

... change Stable isotopes Thermal preference Heat increment of feeding Specific dynamic action Tsetse Diptera Animals eat to obtain the energy essential for the basic functions of life – growth, survival and reproduction – but processing food has an inherent energetic cost. The increase...

...-labeled mice indicate how and when the snakes oxidize the different types of metabolic fuels in their diet. This novel approach could be used on virtually any air-breathing animal. Metabolism Nutrition Snakes Specific dynamic action Stable isotopes Pythons have become popular models...

..., with honesty ensured by a direct metabolic or indirect fitness cost to the signaler. Using a stable isotope tracer–tracee method, we characterized the nutrient pools that fuel sex pheromone production in females of the moth Heliothis virescens , as well as the relative importance of larval- and adult-acquired...

... 2014 22 9 2014 © 2014. Published by The Company of Biologists Ltd 2014 Scleractinia Diazotrophy Stable isotopes Symbiosis Coral reef waters are oligotrophic with respect to nitrogen (D'Elia and Wiebe, 1990), thus N 2 fixation by free-living benthic or pelagic cyanobacteria...

... the samples at the Stable Isotope Laboratory of the IZW. This project was initiated during a workshop on the Biology of Desert-dwelling Bats held in the Mitrani Department of Desert Ecology (MDDE), and supported by the Blaustein Center for Scientific Cooperation and the Office of Donor and Associates Affairs...

... and protein turnover hypotheses that predict increased carbon turnover, either in association with increased daily energy expenditure, or in concert with tissue-specific increased protein metabolism. We used stable-isotope-labeled diets to quantify the rate of carbon turnover in 12 different tissues for three...

... substrates were in isotopic equilibrium with exogenous substrates. * Author for correspondence (e-mail: [email protected] ) 7 5 2008 © The Company of Biologists Limited 2008 2008 bats dietary preferences exogenous substrate fat metabolism stable isotopes During...

... on diet composition. * Author for correspondence (e-mail: [email protected] ) 20 11 2007 © The Company of Biologists Limited 2008 2008 incorporation rate stable isotopes Yellow-vented bulbul protein intake diet reconstruction The measurement of naturally...

... 2006 2006 δ 13 C energy storage fuel use hummingbird Selasphorus platycercus isotopic incorporation respiration stable isotopes The nutrients that animals assimilate can follow several pathways. They can be stored for future use, immediately oxidized to fuel metabolism, or used...