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Showing 1 to 20 of 166 for “"Coloration"”.
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The Physical Basis of Extreme Animal Coloration
… and spiders, have evolved extreme forms of coloration that push the limits of absorption and reflectance. In these animals, pigments and structural elements are combined to produce high absorption or high reflectance. Compared to more typical pigmentary or structural colors, relatively …
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Divergence of Threespine Stickleback That Differ in Nuptial Coloration
… in which a shift from red to black nuptial coloration occurred in several locations following glacial retreat. We measured phenotypic variation in a suite of traits and used next generation sequencing to characterize within-species and among-morph genetic variation between the two morphs. We …
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Speciation and the evolution of male breeding coloration in darters
… First, I quantified variation in male breeding coloration across multiple populations of E. caeruleum and E. spectabile using digital photography and image processing software. Male color traits in both species can be categorized as “blue” and “red” components, which are based on chromoprotein …
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Investigation of factors that influence coloration in polycarbonate based compounded plastics
… compounders achieve consistency in plastics coloration. To visualize the flow behaviour of kneading discs zone in a co-rotating intermeshing twin screw extruder used in experimentation, a 3D numerical analysis was carried out using OpenFOAM® software. This study evaluates the dispersive …
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Tests of Adaptive Coloration Hypotheses for Madtom (Notorus) Catfishes (Siluriformes: Ictaluridae)
Predators select for defensive adaptations, such as stings, toxins, and camouflage color patterns. Madtoms, Noturus, are diminutive catfishes with dorsal and pectoral stings. Thirteen of the 25 nominal species have serrated spines in the pectoral sting and a contrasting pigment pattern. Behavior of …
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Impacts And Implications Of Polytypism On The Evolution Of Aposematic Coloration
… species use conspicuous signals (i.e., bright coloration) to warn predators of the risks of predation due to a secondary defense. Theoretical, lab, and field experiments have demonstrated that individuals who project novel conspicuous signals should experience disproportionately high predation …
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Coloration, Camouflage, and Sexual Dichromatism in the Northern Pacific Rattlesnake (Crotalus oreganus)
… viperid snakes, natural selection has shaped coloration and patterning to match local habitats, and for males to show greater warning coloration than females due to a less sedentary lifestyle. The Northern Pacific Rattlesnake (<em>Crotalus oreganus) </em>is likely the most abundant ambush …
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Geography, coloration and speciation in a genus of neotropical reef fishes (Gobiidae: Elacatinus)
… separate ranges. Sister taxa usually differ by coloration, and distantly related sympatric species frequently differ by habitat. These differences suggest that some combination of coloration and ecological differences may facilitate assortative mating in sympatry or at range boundaries. The …
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Identifying and characterizing genes and transcription factors involved in coloration of apple fruit
… determinants of fruit quality is skin color. Red coloration in apple fruit is attributed to anthocyanin accumulation. Anthocyanins are encoded by structural genes, in the anthocyanin biosynthetic pathway, which are highly regulated by transcription factors. In this thesis, studies were conducted …
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Effets de polarisation sur la coloration d'un matériau à changement de phase
… de dispositifs ultra-minces avec réflectance et coloration variable. Le VO₂ est un PCM particulièrement intéressant en raison de sa basse température d’activation, comparativement à d’autre PCM typiquement utilisés, mais il offre une mauvaise performance optique dans le spectre visible, car les …
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Inheritance of Dorsal Fin Coloration in the Metriaclima Species Complex (Teleostei: Cichlidae) of Lake Malawi
… endemic populations, differing primarily in coloration and often of uncertain taxonomic rank. The recency and rapidity of speciation within the mbuna have led to difficulties in reconstructing an accurate species-level phylogeny, in turn limiting our ability to elucidate the evolutionary …
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Contribution à l'étude de métabolites secondaires d'Harmonia axyridis (Pallas) en relation avec la coloration de l'insecte
… (Pallas) (Coccinellidés) en relation avec la coloration de l’insecte. Dans ce but, deux méthodes analytiques originales de quantification de métabolites secondaires de cet insecte ont été mises au point en vue de doser l’harmonine, son principal alcaloïde défensif, et la …
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The Effect of Aposematic Coloration on the Food Preference of Aphelocoma coerulescens, the Florida Scrub Jay
<p>Aposematic coloration, commonly observed in noxious organisms, serves as a warning to predators to avoid attacking specific prey. This coloration is conspicuous in nature, with one of the most common examples being a red and black pattern. The plant Abrus precatorius exhibits this warning signal …
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Calcium Dynamics Affecting Egg Production, Skeletal Integrity, and Egg Coloration in Ring-necked Pheasants (Phasianus colchicus)
<p>These 4 chapters represent manuscripts formatted for submission to journals based on an experiment conducted on Ring-necked Pheasants (Phasianus colchicus). Calcium limits the distribution of this species, which produces 7-15 eggs per clutch. They may renest up to 5 times per breeding season on …
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Effects of Testosterone on the Spatial Ecology, Coloration, and Brain Regions in Western Fence Lizards, Sceloporus occidentalis
… home range size, it also causes an increase in coloration, which is used as a signal to deter or elicit aggressive behaviors in lizards. Potentially, contests are less common in natural settings than in the lab due to this signaling despite increased frequency overlap of home ranges in males. …
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Innovative visual effects in printed and dyed textiles for fashion: the combination of various printing techniques for coloration and relief effects
… Practical research of textile printing and other coloration techniques has been documented within the framework of a dictionary of visual effects. This was used as a point of reference to explore the possibility of increasing design potential by the combination of elements, and can be found in …
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Assessment of anthropocentric representations of color patterns for biological relevance
Studying animal coloration is a notoriously difficult task as animals differ in their visual system properties (number of cone cells, spectral sensitivities of cone cells, filtering properties of ocular media, etc.) and thus may perceive and respond to stimuli differently than we do. These …
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Taxonomia e distribuição geográfica das subespécies brasileiras de Erythrolamprus aesculapii (Linnaeus, 1758) (Serpentes, Colubridae)
… studied with analysis of variance. Patterns of coloration were classified and a sample of hemipenis were observed. Five basic patterns of coloration were recognized. The hemipenis of the specimens from different areas were virtually without differences, but the statistical analysis have …
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The Importance of the Multicomponent Display in Sexual Selection of Black Morph Girardinus metallicus (Pisces: Poeciliidae)
… displays are composed of traits, such as coloration, structural ornaments, and behavior, that become integrated and signal information to conspecifics. Estimation of multicomponent displays in fishes often involves measurement of color traits. Fish color measurements are often obtained …
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Sensory exploitation and condition indication may explain red pelvic spines in the brook stickleback Culaea inconstans
… selected trait. Question: Did red pelvic spine coloration in male Turnbull National Wildlife Refuge (TNWR) brook stickleback (Cu!aea inconstans) evolve to exploit a preexisting sensory bias for red prey, thus helping males draw females to the nest? Or, did it evolve as an intersexual signal …
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