Quantifying individual variation in behaviour: mixed-effect modelling approaches
TLDR
An overview of how mixed-effect models can be used to partition variation in, and correlations among, phenotypic attributes into between- and within-individual variance components is provided.Abstract:
Growing interest in proximate and ultimate causes and consequences of between- and within-individual variation in labile components of the phenotype - such as behaviour or physiology - characterizes current research in evolutionary ecology. The study of individual variation requires tools for quantification and decomposition of phenotypic variation into between- and within-individual components. This is essential as variance components differ in their ecological and evolutionary implications. We provide an overview of how mixed-effect models can be used to partition variation in, and correlations among, phenotypic attributes into between- and within-individual variance components. Optimal sampling schemes to accurately estimate (with sufficient power) a wide range of repeatabilities and key (co)variance components, such as between- and within-individual correlations, are detailed. Mixed-effect models enable the usage of unambiguous terminology for patterns of biological variation that currently lack a formal statistical definition (e.g. 'animal personality' or 'behavioural syndromes'), and facilitate cross-fertilisation between disciplines such as behavioural ecology, ecological physiology and quantitative genetics.read more
Citations
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Journal ArticleDOI
The effect of heterospecific and conspecific competition on inter-individual differences in tungara frog tadpole (Engystomops pustulosus) behavior
TL;DR: In this article , the authors used univariate and multivariate hierarchical mixed effect models to investigate the effect of treatment on mean behavior, variance among and within individuals, behavioral repeatability and covariance among individuals in their behavior between contexts.
Journal ArticleDOI
Variation in Embryonic Metabolic Reaction Norms and the Role of the Environment
TL;DR: This paper measured the reaction norms of embryonic heart rate in response to egg temperature and the change in egg mass over the incubation period in wild house sparrows and found that heart rate intercepts, not slopes, varied among clutches and that neither intercepts nor slopes varied among eggs within clutches.
Journal ArticleDOI
Fear of missing out? Personality and plasticity in food neophilia by wild vervet monkeys, Chlorocebus pygerythrus
Christina Nord,Tyler R. Bonnell,D Roth,Madison Clarke,Mark Dostie,Peter Henzi,Louise Barrett +6 more
TL;DR: This article explored interindividual variation in neophilia towards novel foods by recording whether animals ingested novel food stuffs (Nindividuals = 116; Ntrials = 276) in three troops of wild vervet monkeys.
Dissertation
Habitat quality, torpor expression and pathogen transmission in little brown bats (Myotis lucifugus)
TL;DR: The hypotheses that warm roosting habitat reduces use of torpor by endangered little brown bats (Myotis lucifugus); but 2) increases the risk of pathogen acquisition from substrates in the environment are tested.
References
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