Journal ArticleDOI
Combined usage of stable isotopes and GPS-based telemetry to understand the feeding ecology of an omnivorous bird, the Ring-billed Gull (Larus delawarensis)
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Ring-billed Gulls that foraged predominantly in anthropogenic habitats exhibited significantly lower δ15N in blood cells and higher total C to N ratios (C:N) in liver, characteristic of profiles determined in food items consumed by Ring-bills at these urbanized sites.Abstract:
The aim of the present study was to investigate the feeding ecology of an omnivorous bird, the Ring-billed Gull (Larus delawarensis Ord, 1815), breeding in a highly urbanized and heterogeneous land...read more
Citations
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Carbon and Nitrogen Stable Isotopes in Fastfood: Signatures of Corn and Confinement
H. Jahren,R. Kraft +1 more
TL;DR: Carbon and nitrogen stable isotopes were used to infer the source of feed to meat animals, the sources of fat within fries, and the extent of fertilization and confinement inherent to production within the U.S. diet.
Journal ArticleDOI
Stable isotopes reveal links between human food inputs and urban ant diets.
TL;DR: The results demonstrate that the degree urban ants exploit human resources changes across the city and among species, and this variation could play a key role in community structure and ecosystem processes where human and animal food webs intersect.
Journal ArticleDOI
Habitat use of urban-nesting lesser black-backed gulls during the breeding season
Anouk Spelt,Cara Williamson,Cara Williamson,Judy Shamoun-Baranes,Emily L. C. Shepard,Peter Rock,Shane P. Windsor +6 more
TL;DR: The results indicate that the range of potential foraging areas available needs to be considered in management decisions and that urban bird populations may not use the resources they are expected to.
Journal ArticleDOI
Unusually high Deca-BDE concentrations and new flame retardants in a Canadian Arctic top predator, the glaucous gull.
TL;DR: The principal constituent in the Deca-brominated diphenyl ether (BDE) mixture, BDE-209, was remarkably the most concentrated PBDE congener determined in liver samples of Eastern Canadian Arctic glaucous gulls, suggesting dietary exposure from the local marine food web and perhaps also from nearby community landfills.
Journal ArticleDOI
Tracking the sources of polybrominated diphenyl ethers in birds: foraging in waste management facilities results in higher DecaBDE exposure in males.
Marie-Line Gentes,Marc J. Mazerolle,Jean-François Giroux,Martin Patenaude-Monette,Jonathan Verreault +4 more
TL;DR: Findings suggest that animals breeding in the vicinity of WMFs as well as mobile species that only use these sites for short stopovers to forage, could be at risk of enhanced DecaBDE exposure.
References
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Journal ArticleDOI
Using stable isotopes to estimate trophic position: models, methods, and assumptions
TL;DR: In this article, the authors developed and discussed methods for generating an isotopic baseline and evaluate the assump- tions required to estimate the trophic position of consumers using stable isotopes in multiple ecosystem studies.
Journal ArticleDOI
Stable isotopes of carbon and nitrogen in the study of avian and mammalian trophic ecology
TL;DR: Differences in stable-isotope composition among trophic groups were detected despite variation attributable to geographic location, climate, and analytical techniques, indicating that these effects are large and pervasive.
Journal ArticleDOI
Assessing Avian Diets Using Stable Isotopes I: Turnover of 13C in Tissues
Keith A. Hobson,Robert G. Clark +1 more
TL;DR: It is suggested that stable isotope analysis could be used to determine relative contributions of endogenous and exogenous nutrient sources for feather growth and egg production in captive and wild birds.
Journal ArticleDOI
Factors That Influence Assimilation Rates and Fractionation of Nitrogen and Carbon Stable Isotopes in Avian Blood and Feathers
TL;DR: Differences in diet‐tissue discrimination factors before and after the diet switch may mean that toward the end of the experiment, some of the nutrients for blood synthesis had been coming from stores, and repeated measures mixed models provided evidence that increases in metabolic rate might accelerate fractional turnover rates in blood.
Journal ArticleDOI
The effect of dietary protein quality on nitrogen isotope discrimination in mammals and birds
TL;DR: It is concluded that protein quality established the baseline for discrimination between dietary groupings, while other variables, such as dietary protein intake relative to animal requirements, created within-group variation.
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