Adrian Posted September 10, 2020 Share Posted September 10, 2020 Davies, A. (2020) Sarracenia purpurea L. ssp.purpurea (Saraceniaceae) Pitcher Plant. Photographs in Visible and Reflected Ultraviolet light. https://www.ultravio...cenia-purpurea/ Other Common Names:Purple Pitcher PlantNorthern Pitcher PlantComment:This North American species was introduced into the UK in the 1980's and has become a pest species. Attempts are made to remove colonies annually. Like all other Sarracenia species photographed, the veining pattern disappears in the UV, to be replaced with UV absorbing liquid droplets. Note: The spider web has become more visible in the UV record. This is going to become an area of further research. Current research indicates that some spiders webs actually attract their prey by UV reflection. Reference:1. Bailey, T, and McPherson S, (2016) Carnivorous Plants of Britain and Ireland. Redfern Natural History Productions. Equipment: D800-broadband + UV Nikkor 105mm lens UV: Baader U filter, 4 x Metz 45 CT1 full spectrum modified flash guns. WB with Photo NinjaVisible: Schott S8612 filter with Elinchrom flash guns. Link to comment
JMC Posted September 10, 2020 Share Posted September 10, 2020 Wow, that spiders web looks very different in UV. Out of interest Adrian, were different apertures used for the visible and UV shots? The depth of field looks very different. Link to comment
Adrian Posted September 10, 2020 Author Share Posted September 10, 2020 Apologies, the UV was f/8, the visible f/16.One theory about spider webs is that circular webs can look like flowers when seen in UV. I hope to photograph some during the autumn. Link to comment
JMC Posted September 10, 2020 Share Posted September 10, 2020 Thanks Adrian. Cool, yes, keep us posted on what you find out about spiders webs. Link to comment
dabateman Posted September 10, 2020 Share Posted September 10, 2020 Spider webs have an amyloid structure and will have apple-green birefringence in polarized light when stained with congo red.I still need to get a great shot of a spider web. I had a perfect one in my yard but missed it before it was destroyed. Link to comment
Cadmium Posted September 11, 2020 Share Posted September 11, 2020 Adrian, Great shots! Link to comment
Andrea B. Posted December 8, 2020 Share Posted December 8, 2020 Adrian, I made a minor rearrangement of your post headerso that it would be searchable by the Index making algorithm. Thank you for this lovely contribution. Link to comment
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