Oestradiol reduces female bill colour in a mutually ornamented bird

Romero‐Diaz, Cristina; Silva, Paulo A.; Soares, Marta C.; Cardoso, Gonçalo C.; Trigo, Sandra

doi:10.1098/rspb.2022.1677

Cited by 4 publications

(1 citation statement)

References 92 publications

(141 reference statements)

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“…These forms, and their underlying functions, have occupied the attention of functional morphologists, who compare them among species as a way of identifying adaptations (Lauder, 1981;Losos, 1990;Irschick et al 1997;Biewener & Patek, 2018). With the development of new tools and methods for quantifying biological form, researchers are able to gather new types of data and ask novel questions about form and function (Rohlf & Marcus, 1993;Zelditch et al, 2012). One of the more recent innovations is the new ability to reconstruct digital 3D models that accurately represent an organism's body shape while alive (Irschick et al, 2022;Leménager et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

PicoCam: High-resolution 3D imaging of live animals and preserved specimens

Medina,

Irschick,

Epperly

et al. 2024

Preprint

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The PicoCam system is a multicamera photogrammetry rig used for generating high-resolution 3D models of animals in the field, or preserved specimens in laboratory or museum settings. The digital measurement of 3D models is increasingly useful for studying body shape. However, methods that capture submillimetric detail often do so at the cost of portability and versatility; this system aims to bridge this gap. The PicoCam system employs 3D digital photogrammetry, a process that generates accurate, full-color, 3D models from sequences of photographs. By using six cameras and a rotating base, the system is able to capture multiple angles in rapid succession, which is a key advantage for both 3D-imaging live specimens and efficiently scanning museum specimens. Through the use of macro lenses and high-resolution camera sensors, this system can capture submillimetric detail without sacrificing portability. In this study, we 3D imaged the bills of 19 species of hummingbirds using the PicoCam system and measured length, height, width, surface area, and volume of their bills. We examined eight species in the field and 11 from the Burke Museum in Seattle. We chose Hummingbird bills as a model system, as their fine-scale interspecific differences in 3D shape can have significant functional and behavioral implications, and could tell us more about how these traits predict habitat and resource use. The prospect of a common 3D-imaging method for both museum and field use is compelling when documenting structures shape within and among species. The PicoCam system is also valuable for quantifying the 3D shape of fine-scale phenotypes (like hummingbird bills) that benefit from digital measurement, preservation, and improved accessibility. Lastly, the PicoCam system allows a kind of digital 3D collection, by which the shape of biological structures in the field can be recorded and stored in a public database without the need to collect a specimen. This opens the door to studies in which multiple 3D image captures of the same individual across different time scales permit 3D shape/color comparisons (e.g., seasonal, ontogenetic changes).

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Section: Introductionmentioning

confidence: 99%

PicoCam: High-resolution 3D imaging of live animals and preserved specimens

Medina,

Irschick,

Epperly

et al. 2024

Preprint

View full text Add to dashboard Cite

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Oestradiol reduces female bill colour in a mutually ornamented bird

et al. 2022

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Carotenoid-based colour signals can be costly to produce and maintain, and trade-offs between signalling and other fitness traits are expected. In mutually ornamented species, trade-offs with reproduction may be stronger for females than males, because females often dedicate more resources to offspring production, which may lead to plastic investment in colour signals and plastic sexual dichromatism. Oestradiol is a candidate mediator of this trade-off because it regulates reproductive physiology and may also influence the expression of coloration. We tested this hypothesis by giving female common waxbills ( Estrilda astrild ) either oestradiol (17β-oestradiol) or empty implants during the early breeding season and measured spectral reflectance of carotenoid-based bill coloration weekly for two months. Using a model of avian vision, we found that bill colour in oestradiol-implanted females became less saturated, less red in hue and brighter, compared with control females and with unimplanted males. This resulted in a change in bill sexual dichromatism from imperceptible to perceptible. Results support the hypothesis that female reproductive physiology influences investment in coloration through changes in oestradiol and show a form of female-driven plastic sexual dichromatism. Greater sensitivity of female colour to physiological and/or environmental conditions helps explain why differences in sexual dichromatism among species differing in ecology often evolve owing to changes in female rather than male phenotype.

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PicoCam: High‐resolution 3D imaging of live animals and preserved specimens

Medina,

Irschick,

Epperly

et al. 2024

Methods Ecol Evol

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The PicoCam system is a multi‐camera photogrammetry rig used for generating high‐resolution 3D models of animals in the field, or preserved specimens in laboratory or museum settings. The digital measurement of 3D models is increasingly useful for studying body shape. However, methods that capture sub‐millimetric detail often do so at the cost of portability and versatility; this system aims to bridge this gap. The PicoCam system employs 3D digital photogrammetry, a process that generates accurate, full‐colour, 3D models from sequences of photographs. By using six cameras and a rotating base, the system is able to capture multiple angles in rapid succession—a key advantage for both 3D‐imaging live specimens and efficiently scanning museum specimens. Through the use of macro lenses and high‐resolution camera sensors, this system can capture sub‐millimetric detail without sacrificing portability. In this study, we 3D imaged the bills of 19 species of hummingbirds using the PicoCam system and measured length, height, width, surface area and volume of their bills. We examined eight species in the field and 11 from the Burke Museum in Seattle. We chose Hummingbird bills as a model system, as their fine‐scale interspecific differences in 3D shape can have significant functional and behavioural implications, and could tell us more about how these traits predict habitat and resource use. The prospect of a common 3D‐imaging method for both museum and field use is compelling when documenting structures' shape within and among species. The PicoCam system is also valuable for quantifying the 3D shape of fine‐scale phenotypes (like hummingbird bills) that benefit from digital measurement, preservation, and improved accessibility. Finally, the PicoCam system allows ‘digital 3D collection’, by which the shape of biological structures in the field can be recorded and stored in a public database without the need to collect a specimen. This opens the door to studies in which multiple 3D image captures of the same individual across different time scales permit 3D shape/colour comparisons (e.g. seasonal, ontogenetic changes).

show abstract

Oestradiol reduces female bill colour in a mutually ornamented bird

Cited by 4 publications

References 92 publications

PicoCam: High-resolution 3D imaging of live animals and preserved specimens

PicoCam: High-resolution 3D imaging of live animals and preserved specimens

Oestradiol reduces female bill colour in a mutually ornamented bird

PicoCam: High‐resolution 3D imaging of live animals and preserved specimens

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