Helena Ajuria Ibarra

Helena Ajuria Ibarra
Universidad Veracruzana | UV · Instituto de Biotecnología y Ecología Aplicada (INBIOTECA)

Ph.D Life Science

About

7
Publications
1,935
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Introduction
I am interested in studying the mechanisms that produce different phenotypic traits in animals, including behaviour, and how these mechanisms are influenced by biotic and abiotic factors, using spiders as study systems. I am especially interested in the effects that intra and interspecific interactions have on such traits.

Publications

Publications (7)
Article
Predation is one of the main interactions between organisms and one of the primary selective agents for their survival. Both prey and predators have developed different strategies and characteristics that allow them to be conspicuous or go undetected. In sit and wait predators, their shape and appearance are important factors that allow them to rem...
Article
The existence of conspicuous color polymorphisms in animals provides an ideal opportunity to examine the mechanisms which determine genetic and phenotypic variation in populations. It is well known that directional and negative frequency-dependent selection by predators can influence the persistence of color polymorphisms in their prey, but much le...
Article
Full-text available
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 visit...
Article
Full-text available
Colour variation is frequently observed in spiders. Such variation can impact fitness by affecting the way spiders are perceived by relevant observers such as prey (i.e. by resembling flower signals as visual lures) and predators (i.e. by disrupting search image formation). Verrucosa arenata is an orb-weaving spider that presents colour variation i...
Article
Full-text available
Digital processing and analysis of high resolution images of 30 individuals of the orb web spider Verrucosa arenata were performed to extract and quantify human visible colors present on the dorsal abdomen of this species. Color extraction was performed with minimal user intervention using an unsupervised algorithm to determine groups of colors on...
Article
Conspicuous colour variation, caused by the influence of the environment on phenotype or by genetic differences among individuals, is frequently observed in nature. If genetic in origin, colour variation can facilitate the study of mechanisms that contribute to the maintenance of true polymorphisms. Here we describe, for the first time, the female-...
Article
Full-text available
Many invertebrate species show conspicuous colour polymorphisms, the study of which has provided us with important insights in evolutionary biology. The potential importance of frequency-dependent selection in the maintenance of polymorphisms was identified by theoretical studies more than 50 years ago, and since then, the topic has received consid...

Questions

Question (1)
Question
I am studying the colour polymorphism of a crab spider and I want to know if birds can discriminate among the spider's colour morphs. I have calculated the excitation values of the four bird cone photoreceptors and transformed these into tetrahedral space coordinates (x, y, and z). I would like to represent these graphically in a colour tetrahedron, but i haven't been able to figure out how to obtain the coordinates for the vertices (representing the four classes of receptors: u/v, s, m, and l) of the tetrahedron. Any help will be much appreciated.

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