2019
DOI: 10.1111/ibi.12708
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Quantifying the maculation of avian eggs using eggshell geometry

Abstract: Birds' eggs often exhibit considerable variation in the presence and pattern of superficial pigmentation, or maculation. However, despite long appreciation of the nature of this variation both between and within species, there is still poor understanding of why such a diversity of patterns has evolved. Accurately quantifying eggshell maculation is therefore key to elucidating its functional significance. Maculation is typically quantified from photographs, and so measurements may be biased by the perceived dis… Show more

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Cited by 5 publications
(4 citation statements)
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“…As a result, a function could be deduced that, unfortunately, would be adequate only to those eggs that were involved in the experiment. [10][11][12] Some authors 13,14 applied the circle equation instead of ellipse as the basic formula, but the principle of empirical determination of the function f(x) remained unchanged. Several attempts were made to describe the function f(x) theoretically in the basic ellipse formula; 15,16 however, for universal and practical applicability to all eggs (rather than just theoretical systems), it is necessary to increase the number of measurements and the obtained coefficients.…”
Section: Theorymentioning
confidence: 99%
“…As a result, a function could be deduced that, unfortunately, would be adequate only to those eggs that were involved in the experiment. [10][11][12] Some authors 13,14 applied the circle equation instead of ellipse as the basic formula, but the principle of empirical determination of the function f(x) remained unchanged. Several attempts were made to describe the function f(x) theoretically in the basic ellipse formula; 15,16 however, for universal and practical applicability to all eggs (rather than just theoretical systems), it is necessary to increase the number of measurements and the obtained coefficients.…”
Section: Theorymentioning
confidence: 99%
“…Regardless of the hypothesis being tested, the first step in all studies is to accurately and objectively measure the eggshell pigmentation (Pike, 2019 ). Reflectance spectrometry is a golden standard in studies on avian integuments coloration and works well in species with uniformly coloured eggshells (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…As a starting point, one can embody structurally a certain engineering object in the shape of an egg through use of its respective mathematical model. Despite fairly extensive research in this field for ∼70 years (e.g., Preston, 1953 ; Carter, 1968 ; Todd and Smart, 1984 ; Smart, 1991 ; Baker, 2002 ; Troscianko, 2014 ; Biggins et al, 2018 ; Pike, 2019 ), the Narushin’s ( Narushin, 2001b ) and Hügelschäffer’s ( Petrović and Obradović, 2010 ; Petrović et al, 2011 ; Obradović et al, 2013 ) models have recently gained the most attention. While the former is thought to be more applicable in thin-walled shell structures ( Zhang et al, 2017a ; b , 2019 , 2021 , 2022 ), the latter has been more adapted to architectural and construction design ( Petrović et al, 2011 ; Maulana et al, 2015 ).…”
Section: Introductionmentioning
confidence: 99%