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65 results for “iridescence”
FIGURES 48, 49 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 48, 49. Geographical distribution of the genus Brachinepticula Diškus & Stonis. 48, distribution map of all currently known species; 49, South American transition zone of the Neotropical Region (after Stonis et al. 2016 and Morrone 2014, 2015, modified)
FIGURES 40–47 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 40–47. The genus Brachinepticula Diškus & Stonis, major diagnostic characters (after Stonis et al. 2018). 40, 42–47, B. plurilobata Diškus & Stonis; 41, B. elongata Remeikis & Stonis
FIGURES 30–39 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 30–39. The genus Brachinepticula Diškus & Stonis, major diagnostic characters of the male genitalia (after Stonis et al. 2018). 30, 32–37, B. plurilobata Diškus & Stonis; 31, 38, 39, B. elongata Remeikis & Stonis
FIGURES 1–5 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 1–5. Collecting locality in Colombian páramo. 1–4, Brachinepticula melania sp. nov., habitat, Cundinamarca, Parque Ecológico Matarredonda, Páramo de Cruz Verde, 3300 m; 5—B. colombica sp. nov., habitat, Cundinamarca, Fómeque, Finca La Laja (near Parque Ecológico Matarredonda, Páramo de Cruz Verde), 3200 m
FIGURES 23–29 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 23–29. Brachinepticula colombica Remeikis, Mey & Stonis, sp. nov., holotype (MfN / ICN). 23–25, adult female; 26–29, female genitalia, slide no. RA1101
FIGURES 19–22 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 19–22. Male genitalia of Brachinepticula melania Remeikis, Mey & Stonis, sp. nov., holotype, genitalia slide no. RA1100 (MfN / ICN). 19, 21, dorsal view; 20, 22, lateral view
FIGURES 13–18 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 13–18. Male genitalia of Brachinepticula melania Remeikis, Mey & Stonis, sp. nov., holotype, genitalia slide no. RA1100 (MfN / ICN). 13, 14, capsule with phallus removed; 15–18, phallus
FIGURES 6–12 in Collecting in the Northern Andean Páramo revealed purple iridescent pygmy moths of the little known Andean endemic Brachinepticula (Nepticulidae)
FIGURES 6–12. Male adult of Brachinepticula melania Remeikis, Mey & Stonis, sp. nov., holotype, Colombia, Cundinamarca, Parque Ecológico Matarredonda, Páramo de Cruz Verde, 3300 m (MfN / ICN)
Data from: Molecular and iridescent feather reflectance data reveal recent genetic diversification and phenotypic differentiation in a cloud forest hummingbird
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Data from: A reliable technique to quantify the individual variability of iridescent coloration in birds
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Data from: Biomimicry of iridescent, patterned insect cuticles: comparison of biological and synthetic, cholesteric microcells using hyperspectral imaging
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Data from: Do trace metals influence visual signals? Effects of trace metals on iridescent and melanic feather colouration in the feral pigeon
Trace metals are chemical pollutants of prime concern nowadays given their implication in several human diseases and their noxious effects on wildlife. Previous studies demonstrated their negative (e.g. lead, cadmium) or positive (e.g. zinc) effects on body condition, immunity and reproductive success in birds. Because of their effects on bird condition, trace metals are likely to influence the production of condition-dependent plumage colours, that may be used in mate choice. In the feral pigeon Columba livia, we investigated iridescent colouration in response to lead and zinc experimental (i.e. metal supplementation in standardized conditions) and natural exposure (i.e. metal concentrations in feathers of wild urban pigeons), and melanic feather colouration in response to experimental lead and zinc exposure. Both studies (i.e. experimental and correlative) consistently showed that lead exposure decreased iridescent neck feather brightness independently of colour morph. Moreover, lead, when provided alone, decreased melanic feather reflectance in the middle wavelengths while zinc supplementation increased melanic feather reflectance in the violet-wavelength. In conclusion, our study suggests that the colouration of iridescent and melanic feathers depends on the exposure to pollutants. Whether trace metal exposure affected the ability of birds to produce melanin pigments, to grow the microstructural feather elements required for maximum colour display, or to cope with bacteria that degrade feather microstuctures remains unclear. Future studies should investigate whether these metal-induced modifications of plumage colouration affect behaviours involved in sexual selection.
Flies exploit predictable perspectives and backgrounds to enhance iridescent signal salience and mating success
<p class="FirstParagraph"><span><span><span><span><span><span><span><span><span><span><span>Communication requires both the encoding of information and its effective transmission, but little is known about display traits that primarily serve to enhance efficacy. Here we examined the visual courtships of <i>Lispe cana</i>, a cursorial fly that lives and mates in heterogeneous foreshores, and tested the prediction that males should seek to enhance signal salience and consequent fitness through the flexible choice of display locations. We show that courting males access the field of view of females by straddling them and holding their wings closed, before moving ahead to present their structurally coloured faces in ritualised dances. Males preferentially present these UV-white signals against darker backgrounds, and the magnitude of contrast predicts female attention, which in turn predict mating success. Our results demonstrate a striking interplay between the physical and attentional manipulation of receivers and reveal novel routes to the enhancement of signal efficacy in noisy environments.</span></span></span></span></span></span></span></span></span></span></span></p>
Data from: Nanoscale millefeuilles produce iridescent bill ornaments in birds
<p>Colours are well studied in bird plumage, however studies on colours in other integumentary structures remain scarce. In particular, iridescent colours from non-plumage structures are undescribed in birds. Here, we show that a multilayer of keratin and lipids are sufficient to produce the iridescent bill of Spermophaga haematina. Furthermore, the observation that the male bill is presented to the female under differengt angles during display, provides support for the hypothesis that iridescence evolved in response to sexual selection. Not only is this the first report on an iridescent bill, it is only the second instance of iridescence in birds in which melanosomes are not involved. These results are thus exciting, as they suggest that birds utilize an even wider array of physical phenomena to produce colouration, and should further stimulate research on non-plumage integumentary colours.</p>
FIGURE 3 in A new iridescent " elfin " butterfly species of Podanotum (Lepidoptera: Lycaenidae: Eumaeini) from the Colombian Andes
FIGURE 3. Map of Colombian Andes illustrating the known distribution of Podanotum pulsar.
Data from: Signal design and courtship presentation coincide for highly biased delivery of an iridescent butterfly mating signal
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Data from: Higher iridescent-to-pigment optical effect in flowers facilitates learning, memory and generalization in foraging bumblebees
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Flies exploit predictable perspectives and backgrounds to enhance iridescent signal salience and mating success
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Data from: Nanoscale millefeuilles produce iridescent bill ornaments in birds
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Data from: Do trace metals influence visual signals? Effects of trace metals on iridescent and melanic feather colouration in the feral pigeon
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Allen Brain Atlas
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