Abstract
Many animals use body coloration as a strategy to communicate with conspecifics, prey, and predators. Color is a trade-off for some species, since they should be visible to conspecifics but cryptic to predators and prey. Some flower-dwelling predators, such as crab spiders, are capable of choosing the color of flowers where they ambush flower visitors and pollinators. In order to avoid being captured, visitors evaluate flowers visually before landing. The crab spider Mecaphesa dubia is a polymorphic species (white/purple color morphs), which inhabits the flower heads of a dune plant, Palafoxia lindenii. Using full-spectrum photography of spiders and flowers, we evaluated how honeybees perceived the spiders at different distances. Using visual modeling, we obtained the chromatic and achromatic contrasts of the spiders on flower heads as perceived by honeybees. Purple morphs were found mainly on the receptacle area and white morphs were equally likely to be found in the flowers and receptacle. According to theoretical modeling, white morphs were visible to honeybees from a distance of 10 cm in receptacle area but appeared to be cryptic in the flower area. Purple morphs were cryptic on the receptacle and less so when they were on the flowers. Spiders on flower heads are predicted to be more easily detected by honeybees using chromatic contrast. Our study shows that the conspicuousness of flower dwelling spiders to honeybees depends on the color morph, the distance of observation, and the position of spider on the flower head.
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Acknowledgements
We thank the anonymous reviewers who contributed to the improvement of this document. We thank the Centro de Investigaciones Costeras La Mancha (CICOLMA) of Instituto de Ecología A.C., for the support. We thank Elizabeth Navarro-Ulloa for the help in the field.
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We greatly appreciate the financial support of the Consejo Nacional de Ciencia y Tecnología (CONACYT) for the Doctoral fellowship to DRM (No. 301494).
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Table 1
Location of the spiders on flowers heads. Analysis of the location of three color morphs (white, white with purple, and purple) of Mecaphesa dubia spiders, that occupy the area of flowers or receptacles on the floral chapters of Palafoxia lindenii. The table shows the data obtained from the GLM and the posthoc tests of performed with contrasts. Asterisks indicate significant differences. (PDF 41 kb)
Fig. 1
Images of M. dubia spiders and flower heads of P. lindenii in human visible light and ultraviolet light. (PDF 436 kb)
Fig. 2
Chromatic and achromatic contrasts in JND values of the cephalothorax, abdomen, and whole body of white spiders (N = 6 spiders) perceived by honeybees (A. mellifera) on the whole flower heads of P. lindenii and its different areas: flowers and receptacle. Lines above bars represent standard errors, and different letters above bars indicate significant differences. (PDF 251 kb)
Fig. 3
Chromatic and achromatic contrasts in JND values of the cephalothorax, abdomen, and whole body of purple spiders (N = 5 spiders) perceived by honeybees (A. mellifera) on the whole flower heads of P. lindenii and its different areas: flowers and receptacle. Lines above bars represent standard errors, and different letters above bars indicate significant differences. (PDF 249 kb)
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Rodríguez-Morales, D., Rico-Gray, V., García-Franco, J.G. et al. Context-dependent crypsis: a prey’s perspective of a color polymorphic predator. Sci Nat 105, 36 (2018). https://doi.org/10.1007/s00114-018-1562-0
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DOI: https://doi.org/10.1007/s00114-018-1562-0