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16 results for “Metabolic theory”
Data from: Why does offspring size affect performance? Integrating metabolic scaling with life-history theory
Within species, larger offspring typically outperform smaller offspring. While the relationship between offspring size and performance is ubiquitous, the cause of this relationship remains elusive. By linking metabolic and life-history theory, we provide a general explanation for why larger offspring perform better than smaller offspring. Using high-throughput respirometry arrays, we link metabolic rate to offspring size in two species of marine bryozoan. We found that metabolism scales allometrically with offspring size in both species: while larger offspring utilise absolutely more energy than smaller offspring, larger offspring use proportionally less of their maternally-derived energy throughout the dependent, non-feeding phase. The increased metabolic efficiency of larger offspring while dependent on maternal investment may explain offspring size effects –larger offspring reach nutritional independence (feed for themselves) with a higher proportion of energy relative to structure than smaller offspring. These findings offer a potentially universal explanation for why larger offspring tend to perform better than smaller offspring but studies on other taxa are needed.
Data from: Using metabolic theory to describe temperature and thermal acclimation effects on parasitic infection
<p>Predicting temperature effects on species interactions can be challenging, especially for parasitism where it is difficult to experimentally separate host and parasite thermal performance curves. Prior authors proposed a possible solution based on the metabolic theory of ecology (MTE), using MTE-based equations to describe the thermal mismatch between host and parasite performance curves and account for thermal acclimation responses. Here we use published infection data, supplemented with experiments measuring metabolic responses to temperature in each species, to show that this modeling framework can successfully describe thermal acclimation effects on two different stages of infection in a tadpole-trematode system. All thermal acclimation effects on host performance manifested as changes in one key model parameter (activation energy), with measurements of host respiration generating similar MTE parameter estimates and acclimation effects compared to measurements of the host's ability to clear encysted parasites. This result suggests that metabolic parameter estimates for whole-body metabolism can sometimes be used to estimate temperature effects on host and parasite performance curves. However, we found different thermal patterns for measurements of host prevention of initial parasite encystment emphasizing potential challenges when applying MTE-based models to complex parasite-host systems with multiple distinct stages of infection.</p>
Code and data from: Towards a more dynamic metabolic theory of ecology to predict climate change effects on biological systems
<p>This repository contains data and code used to produce Figures 1, 2, and S1 in <em>Towards a more dynamic metabolic theory of ecology to predict climate change effects on biological systems.</em></p> <p>The file "empirical_mte_database.csv" contains a database of peer-reviewed articles pulled from a Web of Science search of papers that empirically tested the temperature dependence predictions of the metabolic theory of ecology (Brown et al. 2004) between 2004 and 2024. </p> <p>The .zip file contains a jupyter notebook, julia project toml file and a README in order to reproduce the simulations illustrating how different temperature dynamics can lead to different inferred thermal performance curves in populations.</p> <p> </p>
Data from: Why does offspring size affect performance? Integrating metabolic scaling with life-history theory
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Data from: Linking life-history theory and metabolic theory explains the offspring size-temperature relationship
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Data from: Using metabolic theory to describe temperature and thermal acclimation effects on parasitic infection
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Mediterranean Diet- and Psychological Well-being Theory-based Intervention to Reverse Metabolic Syndrome in Chile
ClinicalTrials.gov study NCT05454904. IPD Sharing: NO. Countries: 1. Publications: 7.
Efficacy of a Health Empowerment Theory Based Health Information Literacy Promotion Intervention in Individuals With Metabolic Syndrome
ClinicalTrials.gov study NCT07096102. IPD Sharing: NO. Countries: 1. Publications: 5.
Data from: Insect rate-temperature relationships: environmental variation and the metabolic theory of ecology
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Metabolic theory of ecology successfully predicts distinct scaling of ectoparasite load on hosts
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Data from: Metabolic theory predicts animal self-thinning
1. The Metabolic Theory of Ecology (MTE) predicts observed patterns in ecology based on metabolic rates of individuals. The theory is influential but also criticized for a lack of firm empirical evidence confirming MTE's quantitative predictions of processes, e.g. outcome of competition, at population or community level. 2. Self-thinning is a well-known population level phenomenon among plants, but a much less studied phenomenon in animal populations and no consensus exists on what a universal thinning slope for animal populations might be, or if it exists. 3. The goal of this study was to use animal self-thinning as a tool to test population-level predictions from MTE, by analyzing (i) if self-thinning can be induced in populations of house crickets (Acheta domesticus) and (ii) if the resulting thinning trajectories can be predicted from metabolic theory, using estimates of the species-specific metabolic rate of A. domesticus 4. I performed a laboratory study where the growth of A. domesticus was followed, from hatching until emergence as adults, in 71 cohorts of five different starting densities. 5. 96% of all cohorts in the three highest starting densities showed evidence of self-thinning, with estimated thinning slopes in general being remarkably close to that expected under metabolic constraints: A cross-sectional analysis of all data showing evidence of self-thinning produced an OLS slope of -1.11, exactly that predicted from specific metabolic allometry of Acheta domesticus. This result is furthermore supported by longitudinal analyses, allowing for independent responses within cohorts, producing a mean OLS slope across cohorts of -1.13 and a fixed effect LMEM slope of -1.09. Sensitivity analysis showed that these results are robust to how the criterion for on-going self-thinning was defined. Finally, also as predicted by metabolic theory, temperature had a negative effect on the thinning intercept, producing an estimate of the activation energy identical to that suggested by MTE. 6. This study demonstrates a direct link between the metabolic rate of individuals and a population-level ecological process and as such provides strong support for research that aims to integrate body mass, via its effect on metabolism, consumption and competition, into models of populations and communities.
Data from: Predicting the thermal and allometric dependencies of disease transmission via the metabolic theory of ecology
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Data from: Metabolic theory and the temperature-size rule explain the temperature dependence of population carrying capacity
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Data from: Metabolic theory predicts animal self-thinning
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Theory-based Health Behaviour Change Intervention in Patients of Metabolic Syndrome With Chronic Kidney Disease
ClinicalTrials.gov study NCT06527768. IPD Sharing: NO. Countries: 1. Publications: 0.
Theory-based Health Behaviour Change Intervention in Individuals of Metabolic Syndrome With Chronic Kidney Disease
ClinicalTrials.gov study NCT06715735. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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