Many species of the orb-web spider genus Cyclosa often adorn their webs with decorations of prey remains, egg sacs and/or plant detritus, termed ;detritus decorations'. These detritus decorations have been hypothesised to camouflage the spider from predators or prey and thus reduce predation risk or increase foraging success. In the present study, we tested these two alternative hypotheses simu...

UV reflectance of plumage display is important in mate choice of many avian species, but its role in off-body display has received little consideration. Male satin bowerbirds (Ptilonorhynchus violaceus) collect objects for use as bower decorations. Here, I test the hypothesis that UV and non-UV colors are important in choice of satin bowerbird bower decorations (colored squares and blue parrot ...

Bulliform phytoliths play an important role in researching rice origins as they can be used to distinguish between wild and domesticated rice. Rice bulliform phytoliths are characterized by numerous small shallow fish-scale decorations on the lateral side. Previous studies have shown that domesticated rice has a larger number of these decorations than wild rice and that the number of decoration...

Title of Document: THE EFFECT OF SUNLIGHT ON DECORATION PLACEMENT AND MATING SUCCESS IN MALE SATIN BOWERBIRDS Archer Freni Larned, Master of Science 2012 Directed By: Dr. Gerald Borgia, Professor, Department of Biology Males of some bird species choose sunlit display sites to enhance their visual signal. Satin bowerbird (Ptilonorhynchus violaceus) males place colored decorations on their bower ...

Competitive interactions between males can affect mate-choice decisions of females, so it is important to understand the factors that underlie variation in the frequency and intensity of male–male interactions. In bowerbirds (Ptilonorhynchidae), two hypotheses have been proposed to explain withinand between-species variation in the rate at which males steal each other’s decorations. Males may s...

the study, the second-year females’ choice of mate showed no effect of bower treatment, but they did in year 2, when even more decorations were added. An age-biased effect is not restricted to female responses to bower decorations, but also applies to male display intensity. The more intense the male display during the second stage of courtship, the more likely were older females to visit a mal...

success because in this highly competitive business, many males’ bowers are rarely visited by females. The researchers assessed the quality of the bowers in terms of the density and thickness of the sticks used in its construction and also its symmetry. They also checked the decorations on display and grouped them into five categories: artificial and yellow, brown, blue and white natural. The b...

Anthocyanins are some of the most widely occurring secondary metabolites in plants, responsible for the orange, red, purple, and blue colors of flowers and fruits and red colors of autumn leaves. These pigments accumulate in vacuoles, and their color is influenced by chemical decorations, vacuolar pH, the presence of copigments, and metal ions. Anthocyanins are usually soluble in the vacuole, b...

The equivalence between quasi-unit-cell models and Penrose-tile models on the level of decorations is proved using inflation rules for Gummelt coverings with decorated decagons. Owing to overlaps, Gummelt arrangement of decorated decagons gives rise to nine different (context-dependent) decagon decorations in the covering. The inflation rules for decagons for each of nine types are presented an...