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Nanostructures and Monolayers of Spheres Reduce Surface Reflections in Hyperiid Amphipods

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dc.contributor.author Bagge, Laura E en
dc.contributor.author Osborn, Karen J. en
dc.contributor.author Johnsen, Sönke en
dc.date.accessioned 2016-11-16T20:04:58Z
dc.date.available 2016-11-16T20:04:58Z
dc.date.issued 2016
dc.identifier.citation Bagge, Laura E, Osborn, Karen J., and Johnsen, Sönke. 2016. "<a href="https://repository.si.edu/handle/10088/30078">Nanostructures and Monolayers of Spheres Reduce Surface Reflections in Hyperiid Amphipods</a>." <em>Current Biology</em>. 26 (22):3071&ndash;3076. <a href="https://doi.org/10.1016/j.cub.2016.09.033">https://doi.org/10.1016/j.cub.2016.09.033</a> en
dc.identifier.issn 0960-9822
dc.identifier.uri https://hdl.handle.net/10088/30078
dc.description.abstract Summary Transparent zooplankton and nekton are often nearly invisible when viewed under ambient light in the pelagic zone 1 3]. However, in this environment, where the light field is directional (and thus likely to cause reflections), and under the bioluminescent searchlights of potential predators, animals may be revealed by reflections from their body surface 4 7]. We investigated the cuticle surfaces of seven species of hyperiids (Crustacea; Amphipoda) using scanning electron microscopy and found two undocumented features that may reduce reflectance. We found that the legs of Cystisoma spp. (n = 5) are covered with an ordered array of nanoprotuberances 200 ± 20 nm SD in height that function optically as a gradient refractive index material 6, 8, 9]. Additionally, we observed that Cystisoma and six other species of hyperiids are covered with a monolayer of homogenous spheres (diameters ranging from 52 ± 7 nm SD on Cystisoma spp. to 320 ± 15 nm SD on Phronima spp.). Optical modeling using effective medium theory and transfer matrix methods demonstrated that both the nanoprotuberances and the monolayers reduce reflectance by as much as 100-fold, depending on the wavelength and angle of the incident light and the thickness of the gradient layer. Even though we only consider surface reflectance and not internal light scattering, our study demonstrates that these nanoprotuberances and spheres can improve crypsis in a featureless habitat where the smallest reflection can render an animal vulnerable to visual predation. en
dc.relation.ispartof Current Biology en
dc.title Nanostructures and Monolayers of Spheres Reduce Surface Reflections in Hyperiid Amphipods en
dc.type Journal Article en
dc.identifier.srbnumber 140840
dc.identifier.doi 10.1016/j.cub.2016.09.033
rft.jtitle Current Biology
rft.volume 26
rft.issue 22
rft.spage 3071
rft.epage 3076
dc.description.SIUnit NH-Invertebrate Zoology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 3071
dc.citation.epage 3076

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