Bayesian stable isotope mixing models

Parnell, Andrew C and Phillips, Donald L and Bearhop, Stuart and Semmens, Brice X and Ward, Eric J and Moore, Jonathan W and Jackson, Andrew L and Grey, Jonathan and Kelly, David J. and Inger, Richard (2013) Bayesian stable isotope mixing models. Environmetrics, 24 (6). pp. 387-399. ISSN 1180-4009

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In this paper, we review recent advances in stable isotope mixing models (SIMMs) and place them into an overarching Bayesian statistical framework, which allows for several useful extensions. SIMMs are used to quantify the proportional contributions of various sources to a mixture. The most widely used application is quantifying the diet of organisms based on the food sources they have been observed to consume. At the centre of the multivariate statistical model we propose is a compositional mixture of the food sources corrected for various metabolic factors. The compositional component of our model is based on the isometric log-ratio transform. Through this transform, we can apply a range of time series and non-parametric smoothing relationships. We illustrate our models with three case studies based on real animal dietary behaviour.

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13 Jul 2015 11:02
Last Modified:
22 Nov 2022 01:58