Affiliation:
1. Groningen Institute for Evolutionary Life Science, University of Groningen, NL9747AG Groningen, The Netherlands
2. Research Center for Integrative Evolutionary Science, Sokendai-Hayama, The Graduate University for Advanced Studies, SOKENDAI, Hayama 240-0193, Japan
Abstract
The light reflected by the dorsal side of butterfly wings often functions as a signal for, e.g., mate choice, thermoregulation, and/or predator deterrence, while the ventral wing reflections are generally used for crypsis and camouflage. Here, we propose that transmitted light can also have an important role in visual signaling because, in many butterfly species, the dorsal and ventral wing sides are similarly patterned and locally more or less translucent. Extreme examples are the Japanese yellow swallowtail (Papilio xuthus Linnaeus, 1758) and the Yellow glassy tiger (Parantica aspasia Fabricius, 1787). Their wings exhibit a similar color pattern in reflected and transmitted light, which allows enhanced visual signaling, especially in flight. Contrasting cases in which the coloration and patterning of dorsal and ventral wings strongly differ are the papilionid Papilio nireus Linnaeus, 1758, and the pierid Delias nigrina Fabricius, 1775. The wings observed in reflected or transmitted light then show very different color patterns. Wing translucence thus will strongly affect a butterfly’s visual signal.
Funder
Air Force Office of Scientific Research/European Office of Aerospace Research and Development AFOSR/EOARD
JSPS KAKENHI
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