tRophicPosition , an r package for the Bayesian estimation of trophic position from consumer stable isotope ratios
نویسندگان
چکیده
منابع مشابه
Trace metals, stable isotope ratios, and trophic relations in seabirds from the North Pacific Ocean.
Trace elements including mercury, cadmium, selenium, and stable nitrogen isotope ratios (sigma15N) were measured in tissues of Pacific seabirds. Two species of albatross (Diomedea immutabilis, Diomedea nigripes), four species of shearwaters (Puffinus bulleri, Puffinus carneipes, Puffinus griseus, Puffinus tenuirostris), northern fulmar (Fulmarus glacialis), and horned puffin (Fratercula cornicu...
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Over the last few decades, the use of stable isotope ratios in ecological studies has increased greatly, most notably in the area of trophic ecology and food webs (Peterson and Fry 1987, Fry 2006). However, applications of stable isotopes in food web studies have been mostly qualitative to date, prompting the recent development of quantitative approaches to investigate different aspects of trop...
متن کاملCan stable isotope ratios provide for community-wide measures of trophic structure?
Stable isotope ratios (typically of carbon and nitrogen) provide one representation of an organism's trophic niche and are widely used to examine aspects of food web structure. Yet stable isotopes have not been applied to quantitatively characterize community-wide aspects of trophic structure (i.e., at the level of an entire food web). We propose quantitative metrics that can be used to this en...
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Use of stable isotope ratios to trace pathways of organic matter among consumers requires knowledge of the isotopic shift between diet and consumer. Variation in trophic shift among consumers can be substantial. For data from the published literature and supplementary original data (excluding fluid-feeding consumers), the mean isotopic shift for C was +0.5 0.13‰ rather than 0.0‰, as commonly as...
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This introduction to the R package bayesGARCH is a shorter version of Ardia and Hoogerheide (2010), published in The R Journal and available at http://journal. r-project.org/. The package provides functions for the Bayesian estimation of the parsimonious and effective GARCH(1,1) model with Student-t innovations. The estimation procedure is fully automatic and thus avoids the tedious task of tun...
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ژورنال
عنوان ژورنال: Methods in Ecology and Evolution
سال: 2018
ISSN: 2041-210X,2041-210X
DOI: 10.1111/2041-210x.13009