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
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Dissertation
Distinguishing animal personality and innovation in the guppy - the effect of sex and body size
TL;DR: The Sammendrag series examines the links between animal personality, behavioural syndromes, innovation, and structured equation modelling in the context of a youth-services agency.
Journal ArticleDOI
Phylogenetic conservation of behavioural variation and behavioural syndromes.
TL;DR: In this paper, the role of phylogeny in shaping patterns of average behaviours, behavioural variation and behavioural correlations was examined for five species of Gryllid crickets, and it was found that phylogeny shaped average behaviours and behavioural (co)variation.
Journal ArticleDOI
Boldness and exploration vary between shell morphs but not environmental contexts in the snail Cepaea nemoralis
TL;DR: The link between morph and boldness is compatible with visual selection by avian predators, assuming a positive association between boldness and morphological defense (phenotypic compensation hypothesis), and the fact morph-behaviors associations are consistent across environments, despite selection on morph, hint to a possible underlying genetic origin.
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Characterising the flight song: repeatable individual variation of Ovenbird song features
TL;DR: The songs of most passerines have been well described; however, songs from some species are more difficult to record and have yet to be characterised as discussed by the authors, such as the Ovenbird (Seiurus aurocapilla) flight song.
Dissertation
Effects of Periodic Cooling During Incubation on Lifelong Physiology in Zebra Finches
TL;DR: It is shown that cooling during incubation alters Embryonic Heart Rate and Development and alters Adrenocortical Responses in Zebra Finches, and Cooling During Incubation influences Lifelong Growth.
References
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TL;DR: The genetic constitution of a population: Hardy-Weinberg equilibrium and changes in gene frequency: migration mutation, changes of variance, and heritability are studied.
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Mixed-Effects Models in S and S-PLUS
TL;DR: Linear Mixed-Effects and Nonlinear Mixed-effects (NLME) models have been studied in the literature as mentioned in this paper, where the structure of grouped data has been used for fitting LME models.
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TL;DR: For the next few weeks the course is going to be exploring a field that’s actually older than classical population genetics, although the approach it’ll be taking to it involves the use of population genetic machinery.
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Multilevel analysis : an introduction to basic and advanced multilevel modeling
Tom A. B. Snijders,Roel Bosker +1 more
TL;DR: In this paper, the authors proposed a multilevel regression model to estimate within-and between-group correlations using a combination of within-group correlation and cross-group evidence.
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Generalized linear mixed models: a practical guide for ecology and evolution
Benjamin M. Bolker,Mollie Elizabeth Brooks,Connie J. Clark,Shane W. Geange,John R. Poulsen,M. Henry H. Stevens,Jada-Simone S. White +6 more
TL;DR: The use (and misuse) of GLMMs in ecology and evolution are reviewed, estimation and inference are discussed, and 'best-practice' data analysis procedures for scientists facing this challenge are summarized.