Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them?
Postnatal growth is an important life-history trait that varies widely across avian species, and several equations with a sigmoidal shape have been used to model it. Classical three-parameter models have an inflection point fixed at a percentage of the upper asymptote which could be an unrealistic a...
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Online Access: | https://doi.org/10.5061/dryad.s448n5d |
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fttriple:oai:gotriple.eu:50|dedup_wf_001::9dce9194b5a3e6f214a639ce33a7f00a 2023-05-15T16:53:41+02:00 Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? Svagelj, Walter S. Laich, Agustina Gómez Quintana, Flavio 2018-01-01 https://doi.org/10.5061/dryad.s448n5d en eng Dryad http://dx.doi.org/10.5061/dryad.s448n5d https://dx.doi.org/10.5061/dryad.s448n5d lic_creative-commons 10.5061/dryad.s448n5d oai:easy.dans.knaw.nl:easy-dataset:119246 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:119246 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f re3data_____::r3d100000044 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 random effects Phalacrocorax atriceps grouped data females maximum growth rate Growth models nonlinear mixed models growth data asymptotic size Life sciences medicine and health care envir psy Dataset https://vocabularies.coar-repositories.org/resource_types/c_ddb1/ 2018 fttriple https://doi.org/10.5061/dryad.s448n5d 2023-01-22T16:51:23Z Postnatal growth is an important life-history trait that varies widely across avian species, and several equations with a sigmoidal shape have been used to model it. Classical three-parameter models have an inflection point fixed at a percentage of the upper asymptote which could be an unrealistic assumption generating biased fits. The Richards model emerged as an interesting alternative because it includes an extra parameter that determines the location of the inflection point which can move freely along the growth curve. Recently, nonlinear mixed models (NLMM) have been used in modeling avian growth because these models can deal with a lack of independence among data as typically occurs with multiple measurements on the same individual or on groups of related individuals. Here, we evaluated the usefulness of von Bertalanffy, Gompertz, logistic, U4 and Richards’s equations modeling chick growth in the Imperial Shag (Phalacrocorax atriceps). We modelled growth in commonly used morphological traits, including body mass, bill length, head length and tarsus length, and compared the performance of models by using NLMM. Estimated adult size, age at maximum growth and maximum growth rates markedly differed across models. Overall, the most consistent performance in estimated adult size was obtained by the Richards model that showed deviations from mean adult size within 5%. Based on AICc values, the Richards equation was the best model for all traits analyzed. For tarsus length, both Richards and U4 models provided indistinguishable fits because the relative inflection value estimated from the Richards model was very close to that assumed by the U4 model. Our results highlight the bias incurred by three-parameter models when the assumed inflection placement deviates from that derived from data. Thus, the application of the Richards equation using the NLMM framework represents a flexible and powerful tool for the analysis of avian growth. Morphological measurements of female chicks of the Imperial ShagMorphological ... Dataset Imperial Shag Phalacrocorax atriceps Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
random effects Phalacrocorax atriceps grouped data females maximum growth rate Growth models nonlinear mixed models growth data asymptotic size Life sciences medicine and health care envir psy |
spellingShingle |
random effects Phalacrocorax atriceps grouped data females maximum growth rate Growth models nonlinear mixed models growth data asymptotic size Life sciences medicine and health care envir psy Svagelj, Walter S. Laich, Agustina Gómez Quintana, Flavio Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
topic_facet |
random effects Phalacrocorax atriceps grouped data females maximum growth rate Growth models nonlinear mixed models growth data asymptotic size Life sciences medicine and health care envir psy |
description |
Postnatal growth is an important life-history trait that varies widely across avian species, and several equations with a sigmoidal shape have been used to model it. Classical three-parameter models have an inflection point fixed at a percentage of the upper asymptote which could be an unrealistic assumption generating biased fits. The Richards model emerged as an interesting alternative because it includes an extra parameter that determines the location of the inflection point which can move freely along the growth curve. Recently, nonlinear mixed models (NLMM) have been used in modeling avian growth because these models can deal with a lack of independence among data as typically occurs with multiple measurements on the same individual or on groups of related individuals. Here, we evaluated the usefulness of von Bertalanffy, Gompertz, logistic, U4 and Richards’s equations modeling chick growth in the Imperial Shag (Phalacrocorax atriceps). We modelled growth in commonly used morphological traits, including body mass, bill length, head length and tarsus length, and compared the performance of models by using NLMM. Estimated adult size, age at maximum growth and maximum growth rates markedly differed across models. Overall, the most consistent performance in estimated adult size was obtained by the Richards model that showed deviations from mean adult size within 5%. Based on AICc values, the Richards equation was the best model for all traits analyzed. For tarsus length, both Richards and U4 models provided indistinguishable fits because the relative inflection value estimated from the Richards model was very close to that assumed by the U4 model. Our results highlight the bias incurred by three-parameter models when the assumed inflection placement deviates from that derived from data. Thus, the application of the Richards equation using the NLMM framework represents a flexible and powerful tool for the analysis of avian growth. Morphological measurements of female chicks of the Imperial ShagMorphological ... |
format |
Dataset |
author |
Svagelj, Walter S. Laich, Agustina Gómez Quintana, Flavio |
author_facet |
Svagelj, Walter S. Laich, Agustina Gómez Quintana, Flavio |
author_sort |
Svagelj, Walter S. |
title |
Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
title_short |
Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
title_full |
Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
title_fullStr |
Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
title_full_unstemmed |
Data from: Richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
title_sort |
data from: richards’s equation and nonlinear mixed models applied to avian growth: why use them? |
publisher |
Dryad |
publishDate |
2018 |
url |
https://doi.org/10.5061/dryad.s448n5d |
genre |
Imperial Shag Phalacrocorax atriceps |
genre_facet |
Imperial Shag Phalacrocorax atriceps |
op_source |
10.5061/dryad.s448n5d oai:easy.dans.knaw.nl:easy-dataset:119246 oai:services.nod.dans.knaw.nl:Products/dans:oai:easy.dans.knaw.nl:easy-dataset:119246 10|openaire____::9e3be59865b2c1c335d32dae2fe7b254 10|re3data_____::94816e6421eeb072e7742ce6a9decc5f re3data_____::r3d100000044 10|re3data_____::84e123776089ce3c7a33db98d9cd15a8 10|eurocrisdris::fe4903425d9040f680d8610d9079ea14 |
op_relation |
http://dx.doi.org/10.5061/dryad.s448n5d https://dx.doi.org/10.5061/dryad.s448n5d |
op_rights |
lic_creative-commons |
op_doi |
https://doi.org/10.5061/dryad.s448n5d |
_version_ |
1766044265552543744 |