Data from: Accurately quantifying the shape of birds' eggs ...
Describing the range of avian egg shapes quantitatively has long been recognised as difficult. A variety of approaches has been adopted, some of which aim to capture the shape accurately and some to provide intelligible indices of shape. The objectives here are to show that a (four-parameter) method...
| Main Authors: | , , |
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| Format: | Dataset |
| Language: | English |
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Dryad
2019
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.5061/dryad.8kv2b20 https://datadryad.org/stash/dataset/doi:10.5061/dryad.8kv2b20 |
| Summary: | Describing the range of avian egg shapes quantitatively has long been recognised as difficult. A variety of approaches has been adopted, some of which aim to capture the shape accurately and some to provide intelligible indices of shape. The objectives here are to show that a (four-parameter) method proposed by Preston (1953) is the best option for quantifying egg shape, to provide and document an R program for applying this method to suitable photographs of eggs, to illustrate that intelligible shape indices can be derived from the summary this method provides, to review shape indices that have been proposed, and to report on the errors introduced by using photographs of eggs at rest rather than horizontal. ... : programs and test dataPrograms Preston.R and Indices.R, mentioned in supplementary material of the paper, to calculate the Preston parameters and then indices from that output. The zip file also contains test data and brief user guides for each program.programs.zipSupplementary-Material2.html 3d-plotdynamic 3d-plot illustrating the three indices Pointedness, Elongation and Polar Asymmetry for three species (Uria aalge, Uria lomvia, Alca torda)Supplementary-Material2.htmlData and AnalysisContains the R script (Analysis.R) which computes everything in the article, and the data sets used. Also contains the Rmarkdown file (Supplementary-Material2.Rmd) which produces the 3-d plot in Supplementary-Material2.htmlAnalysis.zip ... |
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