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Bertalanffy-Pütter models for avian growth

This paper explores the ratio of the mass in the inflection point over asymptotic mass for 81 nestlings of blue tits and great tits from an urban parkland in Warsaw, Poland (growth data from literature). We computed the ratios using the Bertalanffy-Pütter model, because this model was more flexible...

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Autores principales: Brunner, Norbert, Kühleitner, Manfred, Renner-Martin, Katharina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8075225/
https://www.ncbi.nlm.nih.gov/pubmed/33901213
http://dx.doi.org/10.1371/journal.pone.0250515
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author Brunner, Norbert
Kühleitner, Manfred
Renner-Martin, Katharina
author_facet Brunner, Norbert
Kühleitner, Manfred
Renner-Martin, Katharina
author_sort Brunner, Norbert
collection PubMed
description This paper explores the ratio of the mass in the inflection point over asymptotic mass for 81 nestlings of blue tits and great tits from an urban parkland in Warsaw, Poland (growth data from literature). We computed the ratios using the Bertalanffy-Pütter model, because this model was more flexible with respect to the ratios than the traditional models. For them, there were a-priori restrictions on the possible range of the ratios. (Further, as the Bertalanffy-Pütter model generalizes the traditional models, its fit to the data was necessarily better.) For six birds there was no inflection point (we set the ratio to 0), for 19 birds the ratio was between 0 and 0.368 (lowest ratio attainable for the Richards model), for 48 birds it was above 0.5 (fixed ratio of logistic growth), and for the remaining eight birds it was in between; the maximal observed ratio was 0.835. With these ratios we were able to detect small variations in avian growth due to slight differences in the environment: Our results indicate that blue tits grew more slowly (had a lower ratio) in the presence of light pollution and modified impervious substrate, a finding that would not have been possible had we used traditional growth curve analysis.
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spelling pubmed-80752252021-05-05 Bertalanffy-Pütter models for avian growth Brunner, Norbert Kühleitner, Manfred Renner-Martin, Katharina PLoS One Research Article This paper explores the ratio of the mass in the inflection point over asymptotic mass for 81 nestlings of blue tits and great tits from an urban parkland in Warsaw, Poland (growth data from literature). We computed the ratios using the Bertalanffy-Pütter model, because this model was more flexible with respect to the ratios than the traditional models. For them, there were a-priori restrictions on the possible range of the ratios. (Further, as the Bertalanffy-Pütter model generalizes the traditional models, its fit to the data was necessarily better.) For six birds there was no inflection point (we set the ratio to 0), for 19 birds the ratio was between 0 and 0.368 (lowest ratio attainable for the Richards model), for 48 birds it was above 0.5 (fixed ratio of logistic growth), and for the remaining eight birds it was in between; the maximal observed ratio was 0.835. With these ratios we were able to detect small variations in avian growth due to slight differences in the environment: Our results indicate that blue tits grew more slowly (had a lower ratio) in the presence of light pollution and modified impervious substrate, a finding that would not have been possible had we used traditional growth curve analysis. Public Library of Science 2021-04-26 /pmc/articles/PMC8075225/ /pubmed/33901213 http://dx.doi.org/10.1371/journal.pone.0250515 Text en © 2021 Brunner et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Brunner, Norbert
Kühleitner, Manfred
Renner-Martin, Katharina
Bertalanffy-Pütter models for avian growth
title Bertalanffy-Pütter models for avian growth
title_full Bertalanffy-Pütter models for avian growth
title_fullStr Bertalanffy-Pütter models for avian growth
title_full_unstemmed Bertalanffy-Pütter models for avian growth
title_short Bertalanffy-Pütter models for avian growth
title_sort bertalanffy-pütter models for avian growth
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8075225/
https://www.ncbi.nlm.nih.gov/pubmed/33901213
http://dx.doi.org/10.1371/journal.pone.0250515
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