Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 11 of 11 for “"Visual ecology"”.
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The Visual Ecology of the Cleaner Shrimp-Client Fish Mutualism
… it has been suggested that these signals are visual, and function to identify cleaners as helpers, rather than food, and perhaps to identify clients as seeking cleaning rather than a meal. </p><p>The broad goal of this dissertation was to examine the cleaner shrimp-client fish mutualism by …
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Behavioral Measures and Ecological Correlates of Vision in Poeciliid Fishes
… how animals see the world and how visual systems have evolved to meet the needs of particular animals are major goals of visual ecology research. The Poeciliidae are a diverse family of Neotropical freshwater fishes and are excellent models for visual ecology research given …
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Evolution and functional specializations in nocturnal environments: insights from visual pigments in Chiroptera
… level, vision is initiated through activation of visual pigments, light-sensitive complexes expressed in photoreceptor cells in the retina that have been shown to evolve in response to changes in ecology and light environment. In this thesis, I employ molecular evolutionary analyses and …
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Molecular Evolution of Visual System Genes in Fishes
… of prey and predators. Selection on the visual system should therefore be strong, especially when ecological or genomic changes open new avenues for evolutionary changes. Visual system proteins are thus attractive systems for molecular evolutionary analyses. This thesis presents a …
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Molecular Evolution and Functional Characterization of the Visual Pigment Proteins of the Great Bowerbird (Chlamydera nuchalis) and Other Vertebrates
Visual pigments are light sensitive receptors in the eye that form the basis of sensory visual transduction. This thesis presents three studies that explore visual pigment proteins in vertebrates using a number of computational and experimental methods in an evolutionary framework. The objective is …
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Sexual Selection and Mate Preference in Astatotilapia Burtoni
… and outcomes of males? and (2) Does the visual ecology of females shape their preferences for differently colored males?</p> <p>To address these questions, we adopted the African cichlid, <em>Astatotilapia burtoni</em>, that is indigenous to Lake Tanganyika. The cichlid's notable …
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Multidimensional Approach to Comparative Avian Visual Systems
<p>Since the birth of visual ecology, comparative studies on how birds see their world have been limited to a small number of species and tended to focus on a single visual trait. This approach has constrained our ability to understand the diversity and evolution of the avian visual system. The …
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The Maintenance of Male Color Polymorphism in Poecilia parae
… by techniques that aimed to characterize the visual ecology (e.g., water light transmission, visual sensitivity) of Poecilia parae, I found that this striking color polymorphism is maintained by a complex balance between different components of natural and sexual selection. First, males of the …
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Assessment of anthropocentric representations of color patterns for biological relevance
… 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 observations have led some to propose that …
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Dynamic lighting and its impact on the behaviour of marine invertebrates
… intensity as well as false motion cues in the visual scene. While caustics impair the visual systems of teleost fishes, whether they impact other aquatic organisms with different visual systems remains unknown. In this thesis, I tested whether, and to what extent, dynamic lighting in the form …
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The Genomics of Divergence and Adaptation in Sister Reef Fishes Separated by the Isthmus of Panamá
… the molecular basis of adaptation in the visual system to the contrasting visual environments of the Tropical Eastern Pacific (TEP) and Caribbean. I compiled de novo transcriptomes of the retina and investigated expression and coding sequence changes in opsin genes and expression changes …