Estimating isotopic turnover rates using DEB theory

The isotopic turnover rate (λ) quantifies the rate at which an organism's tissues are renewed.

By Cathelin, Lefebvre, GiraldoEcological ModellingOct 4, 2026

Score████░░░░░░4.3

VerdictWorth a reader's time today.

Abstract

The isotopic turnover rate (λ) quantifies the rate at which an organism’s tissues are renewed. It is a key parameter in dietary studies as it governs predator-prey dynamics and by extension the broader food web. However, λ has historically been difficult to estimate, typically requiring a combination of experiments, empirical data and modelling approaches. Mechanistic models offer a promising alternative for estimating λ. Among these, the Dynamic Energy Budget (DEB) theory provides a particularly relevant framework for describing organism metabolism. In this study, we propose a formal expression of λ within the DEB framework, expressed as a function of length or body mass, temperature, and food intake. Model predictions show good agreement with λ values reported in the literature. By linking λ estimation to DEB theory, this approach provides a user-friendly formulation and enables the estimation of condition-dependent isotopic turnover rates across more than 7000 species across a wide range of taxa.

Emilie Cathelin, Sébastien Lefebvre, Carolina Giraldo

The editor's rubric

Heuristic review

Dimension	Level	Weight	What that level means
Leverage	████░ 4	16%	A general-purpose tool used across several fields (Adam, ResNet, LoRA, next-generation sequencing).
Magnitude	██░░░ 2	20%	Solid incremental gain on a meaningful problem.
Evidence	███░░ 3	20%	Solid: multiple benchmarks or cohorts, ablations, fair baselines, released code or data.
Novelty	██░░░ 2	10%	A new combination of known ideas.
Trajectory	███░░ 3	14%	A clear path to scale.
Stakes	██░░░ 2	20%	Benefits a professional community (practitioners, clinicians, engineers).

Editor’s rationale

Heuristic triage from title and abstract text only, not a reading of the paper. Cues found: method (we propose); breadth (wide range, many tasks); verification (multiple benchmarks); stakes (energy).

How the score was computed

rank-2026-09-29

Score████░░░░░░4.3

Score = 10 × (75% × adjusted merit / 10 + 15% × attention + 10% × freshness)

Merit: 5.3 / 10; Weighted rubric, evidence-gated.
Adjusted merit: 4.5 / 10; Shrunk toward the desk prior by editor confidence (40%).
Attention: 0%; Citations, upvotes, points, mentions.
Freshness: 85%; Half-life decay since publication.

Citations0 (reference 15, via openalex, Oct 6, 2026, 07:31 UTC)
Field-weighted citation impact0 (reference 3, via openalex, Oct 6, 2026, 07:31 UTC)

The record

Reviewed by heuristic-v2 on Oct 6, 2026, 07:29 UTC. Paper type: method.
Categories: Isotope Analysis in Ecology, Sustainability and Ecological Systems Analysis, Physiological and biochemical adaptations, Ecology, Environmental Science
BRIEF, No.5 in the Climate & Energy edition of October 6, 2026.