Choosing the right sigmoid growth function using the unified-models approach
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73598317" target="_blank" >RIV/61989592:15310/19:73598317 - isvavai.cz</a>
Result on the web
<a href="https://onlinelibrary.wiley.com/doi/full/10.1111/ibi.12592" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1111/ibi.12592</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/ibi.12592" target="_blank" >10.1111/ibi.12592</a>
Alternative languages
Result language
angličtina
Original language name
Choosing the right sigmoid growth function using the unified-models approach
Original language description
Growth of the young is an important part of the life history in birds. However, mod-elling methods have paid little attention to the choice of regression model used todescribe its pattern. The aim of this study was to evaluate whether a single sigmoidmodel with an upper asymptote could describe avian growth adequately. We comparedunified versions offive growth models of the Richards family (the four-parameter U-Richards and the three-parameter U-logistic, U-Gompertz, U-Bertalanffy and U4-mod-els) for three traits (body mass, tarsus-length and wing-length) for 50 passerine species,including species with varied morphologies and life histories. The U-family models exhi-bit a unified set of parameters for all models. The four-parameter U-Richards modelproved a good choice forfitting growth curves to various traits–its extrad-parameterallows for aflexible placement of the inflection point. Which of the three-parameter U-models was the best performing varied greatly between species and between traits, aseach three-parameter model had a differentfixed relative inflection value (fraction of theupper asymptote), implying a different growth pattern. Fixing the asymptotes to averagesfor adult trait value generally shifted the model preference towards one with lower rela-tive inflection values. Our results illustrate an overlooked difficulty in the analysis oforganismal growth, namely, that a single traditional three-parameter model does not suitall growth data. This is mostly due to differences in inflection placement. Moreover,some biometric traits require more attention when estimating growth rates and othergrowth-curve characteristics. We recommendfitting either several three-parameter mod-els from the U-family, where the parameters are comparable between models, or onlythe U-Richards model.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10615 - Ornithology
Result continuities
Project
—
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
IBIS
ISSN
0019-1019
e-ISSN
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Volume of the periodical
161
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
14
Pages from-to
13-26
UT code for WoS article
000454604400002
EID of the result in the Scopus database
2-s2.0-85044202403