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1432-1904, 0028-1042

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Pedro Henrique Pereira Gonçalves ◽  
Uiara Costa Rezende ◽  
Phabliny Martins Silva Bomfim ◽  
Valéria Cid Maia ◽  
Denis Coelho Oliveira

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Ivana Lemos Souza ◽  
Diego Bastos Silva ◽  
Luís Cláudio Paterno Silveira ◽  
José Maurício Simões Bento ◽  
Maria Fernanda Gomes Villalba Peñaflor ◽  
...  

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Ashraf M. El‑Sayed ◽  
Suresh Ganji ◽  
Jürgen Gross ◽  
Natalie Giesen ◽  
Margit Rid ◽  
...  

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Nataša Stritih-Peljhan ◽  
Meta Virant-Doberlet

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Mathilde Martin ◽  
Tess Gridley ◽  
Simon Harvey Elwen ◽  
Isabelle Charrier
Keyword(s):  
Fur Seal ◽  

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Mateusz Glenszczyk ◽  
David Outomuro ◽  
Matjaž Gregorič ◽  
Simona Kralj-Fišer ◽  
Jutta M. Schneider ◽  
...  

AbstractExamining the role of color in mate choice without testing what colors the study animal is capable of seeing can lead to ill-posed hypotheses and erroneous conclusions. Here, we test the seemingly reasonable assumption that the sexually dimorphic red coloration of the male jumping spider Saitis barbipes is distinguishable, by females, from adjacent black color patches. Using microspectrophotometry, we find clear evidence for photoreceptor classes with maximal sensitivity in the UV (359 nm) and green (526 nm), inconclusive evidence for a photoreceptor maximally sensitive in the blue (451 nm), and no evidence for a red photoreceptor. No colored filters within the lens or retina could be found to shift green sensitivity to red. To quantify and visualize whether females may nevertheless be capable of discriminating red from black color patches, we take multispectral images of males and calculate photoreceptor excitations and color contrasts between color patches. Red patches would be, at best, barely discriminable from black, and not discriminable from a low-luminance green. Some color patches that appear achromatic to human eyes, such as beige and white, strongly absorb UV wavelengths and would appear as brighter “spider-greens” to S. barbipes than the red color patches. Unexpectedly, we discover an iridescent UV patch that contrasts strongly with the UV-absorbing surfaces dominating the rest of the spider. We propose that red and black coloration may serve identical purposes in sexual signaling, functioning to generate strong achromatic contrast with the visual background. The potential functional significance of red coloration outside of sexual signaling is discussed.


2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Jonas B. Castro ◽  
Glauco Machado ◽  
Rodrigo B. Singer

2021 ◽  
Vol 109 (1) ◽  
Author(s):  
Rodrigo Roucourt Cezário ◽  
Eralci Moreira Therézio ◽  
Alexandre Marletta ◽  
Stanislav N. Gorb ◽  
Rhainer Guillermo-Ferreira

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