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A standardized method for quantifying eggshell spot patterns

2014; Association of Field Ornithologists; Volume: 85; Issue: 4 Linguagem: Inglês

10.1111/jofo.12079

1557-9263

Angela Schmitz Ornés, André Herbst, Andreas Spillner, Wolfgang Mewes, Moriz Rauch,

Plant and animal studies

Journal of Field OrnithologyVolume 85, Issue 4 p. 397-407 Original Article A standardized method for quantifying eggshell spot patterns Angela Schmitz Ornés, Corresponding Author Angela Schmitz Ornés Vogelwarte Hiddensee, Zoological Institute and Museum, University of Greifswald, Soldmannstr. 23, D-17489 Greifswald, GermanyCorresponding author. Email: [email protected]Search for more papers by this authorAndré Herbst, André Herbst Department of Mathematics and Computer Science, University of Greifswald, Walther-Rathenau-Str. 4717487, GermanySearch for more papers by this authorAndreas Spillner, Andreas Spillner Department of Mathematics and Computer Science, University of Greifswald, Walther-Rathenau-Str. 4717487, GermanySearch for more papers by this authorWolfgang Mewes, Wolfgang Mewes Grüner Weg 3, 19395 Plau am See, Ortsteil (OT) Karow, GermanySearch for more papers by this authorMoriz Rauch, Moriz Rauch Kiefernweg 3, 14055 Berlin, GermanySearch for more papers by this author Angela Schmitz Ornés, Corresponding Author Angela Schmitz Ornés Vogelwarte Hiddensee, Zoological Institute and Museum, University of Greifswald, Soldmannstr. 23, D-17489 Greifswald, GermanyCorresponding author. Email: [email protected]Search for more papers by this authorAndré Herbst, André Herbst Department of Mathematics and Computer Science, University of Greifswald, Walther-Rathenau-Str. 4717487, GermanySearch for more papers by this authorAndreas Spillner, Andreas Spillner Department of Mathematics and Computer Science, University of Greifswald, Walther-Rathenau-Str. 4717487, GermanySearch for more papers by this authorWolfgang Mewes, Wolfgang Mewes Grüner Weg 3, 19395 Plau am See, Ortsteil (OT) Karow, GermanySearch for more papers by this authorMoriz Rauch, Moriz Rauch Kiefernweg 3, 14055 Berlin, GermanySearch for more papers by this author First published: 25 November 2014 https://doi.org/10.1111/jofo.12079Citations: 9Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL ABSTRACTen Spottiness is an important component of the morphology of bird eggs and a number of methods have been developed for characterizing variation in spottiness. We developed a quantitative method for measuring and comparing eggs to determine if female European Cranes (Grus grus) lay eggs with individually distinct color and spotting patterns. We used photographs taken under standard conditions and developed a computer program (ESPANA) to quantify egg-spot patterns. The goal of the analysis was to create a "fingerprint" of each eggshell by measuring reflection along virtually drawn lines (transects) on an egg's image. Values measured in the same positions along transects can be compared among eggs by considering them as separate variables defining the pattern. Data were analyzed using cluster analyses and by performing analyses of similarity (ANOSIM). We found that the eggs of female European Cranes (N = 11) had individually distinct color patterns, with eggs laid by a given female more similar to each other than to the eggs of other females. Beyond its potential use for identifying the eggs of specific females, we believe our method could also be useful for investigators quantifying differences in egg-spot patterns for other reasons, for example, examining possible relationships between egg-spot patterns and female quality. The program ESPANA is implemented using the Java programming language and is available as supporting information on the Journal of Field Ornithology website. RESUMENes Una metodología estandarizada para cuantificar patrones de coloración en huevos El patrón de moteado es un componente importante de la morfología de los huevos de aves y varios métodos se han desarrollado para caracterizar su variación. Desarrollamos una metodología cuantitativa para medir y comparar huevos con la meta de determinar si hembras de Grulla Europea (Grus grus) ponen huevos con un patrón individual de coloración y moteado. Utilizamos fotografías tomadas en condiciones estándar y desarrollamos un programa de computación (ESPANA) para cuantificar el patrón de moteado del huevo. El objetivo del análisis fue el de crear una "huella" de cada cáscara de huevo midiendo la reflección a lo largo de líneas virtuales (transectas) en la imagen del huevo. Los valores medidos en las mismas posiciones a lo largo de las transectas pueden ser comparados entre huevos considerándo estos valores como variables que definen el patrón de coloración. Los datos fueron analizados utilizando análisis de agrupación y realizando análisis de similaridad (ANOSIM). Encontramos que los huevos de las hembras de Grulla Europea (N = 11) muestran patrones de coloración individuales, mostrando mas similaridad entre huevos puestos por una misma hembra que entre los puestos por diferentes hembras. Mas allá del potencial uso para identificar huevos de hembras específicas, creemos que nuestro método pudiera ser también útil para investigadores que deseen cuantificar las diferencias en los patrones de moteado de huevos creadas por otras razones, como por ejemplo para examinar la relación entre el moteado del huevo y la calidad de la hembra. El programa ESPANA está implementado utilizando el lenguaje de programación Java y está disponible como información suplementaria en la página web del "Journal of Field Ornithology." Citing Literature Supporting Information Disclaimer: Supplementary materials have been peer-reviewed but not copyedited. Filename Description jofo12079-sup-0001-SupMat1.docx15.6 KB Supplemental Information S1 Supplemental Information S2 jofo12079-sup-0002-SupMat2.docx20.9 KB Supplemental Information S3 Supplemental Information S4 Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article. Volume85, Issue4December 2014Pages 397-407 RelatedInformation