Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes

Rhiannon L. Dalrymple, Darrell J. Kemp, Habacuc Flores-Moreno, Shawn W. Laffan, Thomas E. White, Frank A. Hemmings, Marianne L. Tindall, Angela T. Moles

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Aim: The idea that species are generally more colourful at tropical latitudes has held great appeal among biologists since the days of exploration by early naturalists. However, advances in colour quantification and analysis only now allow an objective test of this idea. We provide the first quantitative analysis of the latitudinal gradient in colour on a broad scale using data from both animals and plants, encompassing both human-visible and ultraviolet colours. Location: Australia. Methods: We collected spectral reflectance data from 570 species or subspecies of birds, adult forms of 424 species or subspecies of butterflies and the flowers of 339 species of plants, from latitudes ranging from tropical forests and savannas at 9.25°S, to temperate forests and heathlands at 43.75°S. Colour patch saturation, maximum contrast between patches, colour diversity and hue disparity between patches were calculated for all species. Latitudinal gradients in colour were analysed using both regression analyses and comparisons of categorically temperate and tropical regions. We also provide phylogenetically independent contrast analyses. Results: The analyses which compared the colour traits of communities and the phylogenetically independent contrasts both show that species in the tropics are not more colourful than those at higher latitudes. Rather, the cross-species analyses indicate that species further away from the equator possess a greater diversity of colours, and their colours are more contrasting and more saturated than those seen in tropical species. These results remain consistent regardless of whether the mean or the maximum of coloration indices are considered. Main conclusions: We demonstrate that birds, butterflies and flowers display similar gradients of colourfulness across latitudes, indicating strong ecological and evolutionary cohesion. However, our data do not support the idea that tropical latitudes contain the most colourful species or house the more colourful biological communities.

LanguageEnglish
Pages1424-1432
Number of pages9
JournalGlobal Ecology and Biogeography
Volume24
Issue number12
DOIs
Publication statusPublished - 1 Dec 2015

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butterfly
butterflies
tropics
flower
bird
flowers
color
birds
latitudinal gradient
subspecies
heathland
heathlands
spectral reflectance
tropical region
temperate forests
temperate forest
cohesion
savanna
quantitative analysis
tropical forests

Cite this

Dalrymple, R. L., Kemp, D. J., Flores-Moreno, H., Laffan, S. W., White, T. E., Hemmings, F. A., ... Moles, A. T. (2015). Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes. Global Ecology and Biogeography, 24(12), 1424-1432. https://doi.org/10.1111/geb.12368
Dalrymple, Rhiannon L. ; Kemp, Darrell J. ; Flores-Moreno, Habacuc ; Laffan, Shawn W. ; White, Thomas E. ; Hemmings, Frank A. ; Tindall, Marianne L. ; Moles, Angela T. / Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes. In: Global Ecology and Biogeography. 2015 ; Vol. 24, No. 12. pp. 1424-1432.
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abstract = "Aim: The idea that species are generally more colourful at tropical latitudes has held great appeal among biologists since the days of exploration by early naturalists. However, advances in colour quantification and analysis only now allow an objective test of this idea. We provide the first quantitative analysis of the latitudinal gradient in colour on a broad scale using data from both animals and plants, encompassing both human-visible and ultraviolet colours. Location: Australia. Methods: We collected spectral reflectance data from 570 species or subspecies of birds, adult forms of 424 species or subspecies of butterflies and the flowers of 339 species of plants, from latitudes ranging from tropical forests and savannas at 9.25°S, to temperate forests and heathlands at 43.75°S. Colour patch saturation, maximum contrast between patches, colour diversity and hue disparity between patches were calculated for all species. Latitudinal gradients in colour were analysed using both regression analyses and comparisons of categorically temperate and tropical regions. We also provide phylogenetically independent contrast analyses. Results: The analyses which compared the colour traits of communities and the phylogenetically independent contrasts both show that species in the tropics are not more colourful than those at higher latitudes. Rather, the cross-species analyses indicate that species further away from the equator possess a greater diversity of colours, and their colours are more contrasting and more saturated than those seen in tropical species. These results remain consistent regardless of whether the mean or the maximum of coloration indices are considered. Main conclusions: We demonstrate that birds, butterflies and flowers display similar gradients of colourfulness across latitudes, indicating strong ecological and evolutionary cohesion. However, our data do not support the idea that tropical latitudes contain the most colourful species or house the more colourful biological communities.",
author = "Dalrymple, {Rhiannon L.} and Kemp, {Darrell J.} and Habacuc Flores-Moreno and Laffan, {Shawn W.} and White, {Thomas E.} and Hemmings, {Frank A.} and Tindall, {Marianne L.} and Moles, {Angela T.}",
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Dalrymple, RL, Kemp, DJ, Flores-Moreno, H, Laffan, SW, White, TE, Hemmings, FA, Tindall, ML & Moles, AT 2015, 'Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes', Global Ecology and Biogeography, vol. 24, no. 12, pp. 1424-1432. https://doi.org/10.1111/geb.12368

Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes. / Dalrymple, Rhiannon L.; Kemp, Darrell J.; Flores-Moreno, Habacuc; Laffan, Shawn W.; White, Thomas E.; Hemmings, Frank A.; Tindall, Marianne L.; Moles, Angela T.

In: Global Ecology and Biogeography, Vol. 24, No. 12, 01.12.2015, p. 1424-1432.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Birds, butterflies and flowers in the tropics are not more colourful than those at higher latitudes

AU - Dalrymple, Rhiannon L.

AU - Kemp, Darrell J.

AU - Flores-Moreno, Habacuc

AU - Laffan, Shawn W.

AU - White, Thomas E.

AU - Hemmings, Frank A.

AU - Tindall, Marianne L.

AU - Moles, Angela T.

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N2 - Aim: The idea that species are generally more colourful at tropical latitudes has held great appeal among biologists since the days of exploration by early naturalists. However, advances in colour quantification and analysis only now allow an objective test of this idea. We provide the first quantitative analysis of the latitudinal gradient in colour on a broad scale using data from both animals and plants, encompassing both human-visible and ultraviolet colours. Location: Australia. Methods: We collected spectral reflectance data from 570 species or subspecies of birds, adult forms of 424 species or subspecies of butterflies and the flowers of 339 species of plants, from latitudes ranging from tropical forests and savannas at 9.25°S, to temperate forests and heathlands at 43.75°S. Colour patch saturation, maximum contrast between patches, colour diversity and hue disparity between patches were calculated for all species. Latitudinal gradients in colour were analysed using both regression analyses and comparisons of categorically temperate and tropical regions. We also provide phylogenetically independent contrast analyses. Results: The analyses which compared the colour traits of communities and the phylogenetically independent contrasts both show that species in the tropics are not more colourful than those at higher latitudes. Rather, the cross-species analyses indicate that species further away from the equator possess a greater diversity of colours, and their colours are more contrasting and more saturated than those seen in tropical species. These results remain consistent regardless of whether the mean or the maximum of coloration indices are considered. Main conclusions: We demonstrate that birds, butterflies and flowers display similar gradients of colourfulness across latitudes, indicating strong ecological and evolutionary cohesion. However, our data do not support the idea that tropical latitudes contain the most colourful species or house the more colourful biological communities.

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