DaveO Posted January 31, 2019 Share Posted January 31, 2019 If this paper doesn't make your head spin - rapidly - you are not reading it carefully enough Signal or cue: the role of structural colours in flower pollinationhttps://academic.oup.com/cz/advance-article/doi/10.1093/cz/zoy096/5244970 Dave Link to comment
nfoto Posted January 31, 2019 Share Posted January 31, 2019 The predicted response developed - rapidly. Link to comment
Andy Perrin Posted January 31, 2019 Share Posted January 31, 2019 It sounds like (based on what I could make of their findings), the angular dependence has as much significance to pollinators as dichroic hotspots have to UV photographers. Link to comment
DaveO Posted February 1, 2019 Author Share Posted February 1, 2019 I came across this when I was looking to see what Adrian Dyer's group had been doing recently as he was one of the first to do UV images (on film in those days) of Australian native flowers. Hidden deep inside this paper is a figure showing the UV Vis reflectance spectra of the subjects of this paper and I have posted my images of some of these: Current Zoology, 2019, 1-15Signal or cue: the role of structural colors in flower pollinationGarcia, Shrestha, Howard, Petersen and Dyer (a) Alyogyne huegelli (Malvaceae)http://www.ultraviol...ogyne-huegelii/UV: Black petals Solanum laciniatum (Solanaceae)http://www.ultraviol...kangaroo-apple/UV: Dark blue petals (f) Pelargonium rodneyanumhttp://www.ultraviol...ta-storks-bill/UV: Light blue petals What is interesting here is that they are at the "blue end" of the UV false colour spectrum whereas previous ones were at the yellow end. One of these days I might make some sense out of it all Dave Link to comment
Alaun Posted February 1, 2019 Share Posted February 1, 2019 Nice paper, but I miss the word "polarisation" in that context. Link to comment
DaveO Posted February 1, 2019 Author Share Posted February 1, 2019 This is another paper which has UV-Vis reflection spectra of various flowers, some of which whose images have been posted on this site How to colour a flower: on the optical principles of flower colourationC.J. van der Kooi, J.T. M. Elzenga, M. Staal and D.G. StavengaProc. R. Soc. B 283: 20160429 https://royalsociety.../rspb.2016.0429 page 4 a) Hibiscus trionum (Malvaceae)No UVP link Borago officinalis (Boraginaceae)No UVP link c) Oenothera biennis (Onagraceae)http://www.ultraviol...ening-primrose/UV: Yellow petals d) Papavera rheoas (Papaveraceae)http://www.ultraviol...s-common-poppy/UV: Yellow petals Supplementary material a) Cinchorum intybus (Asteraceae)http://www.ultraviol...nother-example/UV: Blue petals Browallia americana (Solanaceae)No UVP link c) Solanum trisectum (Solanaceae)http://www.ultraviol...m-buffalo-burr/UV:yellow petalsd) Physalis philadelphia (Solanaceae)http://www.ultraviol...d-groundcherry/UV: dark yellow petalse) Nuphar lutea (Nymphaceae)No UVP link f) Oenothera glazioviana (Onagraceae)http://www.ultraviol...ening-primrose/UV: Yellow petalsg) Petunia nyctaginiflora (Solanaceae)No UVP link h) Convolvulus arviensis (Convolvulacaeae)http://www.ultraviol...field-bindweed/UV: Dark blue petalsi) Lathyrus pratensis (Fabaceae)http://www.ultraviol...adow-vetchling/UV: Dark yellow petalsj) Geranium phaeum (Gerianaceae)http://www.ultraviol...um-herb-robert/UV: Bright blue petalsk) Caltha palustris (Ranunculaceae)http://www.ultraviol...marsh-marigold/UV: Black bullseye on yellow petalsl) Malva moschata (Malvaceae)http://www.ultraviol...ta-musk-mallow/UV: Light blue petals So, there does seem to be a correlation, not a causation, between the UV-Vis spectra and those UV images which show yellow or blue false UV-colours Link to comment
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