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Isotopic ecology ten years after a call for more laboratory experiments
These areas remain central to isotopic ecology and are used as organising foci to review the experimental results that isotopic ecologists have collected and the models that have been built to explain and organise experimental results in these areas. Expand
Effects of elemental composition on the incorporation of dietary nitrogen and carbon isotopic signatures in an omnivorous songbird
Feathers were the most enriched and whole blood and plasma were the least enriched or, in the case of carbon, slightly depleted relative to diet, and for all tissues, carbon and nitrogen isotope discrimination factors increased withcarbon and nitrogen concentrations of diets. Expand
Natural abundance variations in stable isotopes and their potential uses in animal physiological ecology.
It is argued that animal physiological ecologists can benefit from including the measurement of naturally occurring stable isotopes in their battery of techniques, and can make an important contribution to the emerging field of stable isotope in biology by testing experimentally the plethora of assumptions upon which the techniques rely. Expand
Effects of growth and tissue type on the kinetics of 13C and 15N incorporation in a rapidly growing ectotherm
The contribution of growth and catabolic turnover to the rate of 13C and 15N incorporation into several tissues that can be sampled non-invasively in two age classes of a rapidly growing ectotherm and variation in rates among tissues was lower than reported in previous studies. Expand
Ecological physiology of diet and digestive systems.
The morphological and functional design of gastrointestinal tracts of many vertebrates and invertebrates can be explained largely by the interaction between diet chemical constituents and principlesExpand
Beyond the reaction progress variable: the meaning and significance of isotopic incorporation data
The use of information theoretic criteria to assess the number of compartments that must be included in models of isotopic incorporation is proposed, by providing a way to estimate average retention times for an isotope in a tissue (and its associate error) for multi-compartment models. Expand
Dietary Flexibility and Intestinal Plasticity in Birds: A Field and Laboratory Study
Doubts are cast on the notion that dietary flexibility and the plasticity of the gut's enzymes are necessarily correlated and on the general validity of the adaptive modulation hypothesis after the first field documentation of modulation of intestinal enzymes by diet in birds. Expand
Dietary and isotopic specialization: the isotopic niche of three Cinclodes ovenbirds
Tissues deposited in winter (liver and muscle) had distinct stable C and stable N isotope ratio values from tissues deposited in the summer (wing feathers) suggesting that birds changed the resources that they used seasonally from freshwater habitats inThe summer to coastal habitats in the winter. Expand
Conservation and the microbiome.
The concepts and methods used to study the human microbiome could be applied to meet conservation challenges such as captive breeding, reintroduction, invasions of non-native species, and undesirable effects of chemicals on native plants and animals. Expand
Hummingbirds Fuel Hovering Flight with Newly Ingested Sugar
The combination of respirometry and carbon isotope analysis revealed that hummingbirds initially oxidized endogenous fat following a fast and then progressively oxidized proportionately more carbohydrates, providing an example of evolutionary convergence in physiological and biochemical traits among unrelated nectar‐feeding animals. Expand