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 16 of 16 for “"Pigmentation patterns"”.
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Evolution and Development of Pigmentation Patterns in East African Cichlid fishes
… development, highlighting clear tissue-specific patterns of gene expression. These findings suggest that cellular interactions are critical for trait patterning. ii To explore the genetic and developmental basis of egg-spot diversification, I undertook comparative developmental and genomic …
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Understanding the development, evolution, and function of bullseye pigmentation patterns in Hibiscus trionum
Colourful spot, stripe and ring patterns decorate the corolla of many flowering plants and fulfil important biotic and abiotic functions. These petal patterns are created by spatial differences in pigmentation, cell shape and texture of the adaxial petal epidermis. The mechanisms controlling …
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Mapping the Dorsal Skin Pigmentation Patterns of Two Sympatric Populations of Ambystomatid Salamanders, <em>Ambystoma opacum</em> and <em>A. maculatum</em> from Northeast Tennessee.
… ii) what traits influence the dorsal skin pigmentation and how, iii) whether gender differences in developmental stability occur, and iv) the extent of phenotypic variation within each species. The findings of this study revealed SSD in both species of salamanders. The most parsimonious …
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Variation in neural crest development contributes to phenotypic diversification of East African cichlid fishes
… traits, such as craniofacial morphologies and pigmentation patterns, originates from a common embryonic migratory progenitor cell population, the neural crest (NC). Although the genetic and developmental basis of these phenotypes has been investigated, understanding of how and when, …
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Cretaceous Amber: A New Source of Bird Remains and of Palaeoecological Information in Dinosaur Bonebeds
… types of feathers, ontogenetic stages, and pigmentation patterns. Based on recent work that associates feather types with skeletal remains, I was able to attribute many of the feathers to putative source animals. Although a few feathers may belong to non-avian dinosaur taxa, this survey …
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MHC Class I diversity influences haematozoon infection intensity in the polymorphic black sparrowhawk (Accipiter melanoleucus)
… in birds that carotenoïd and melanin-based pigmentation patterns are often associated with parasite resistance. In this study, functional variation at the peptide binding region (PBR) of MHC class I loci is investigated to explain individual variation in blood parasite infection in black …
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Organ-specific regulation and molecular evolution of the maize pericarp color1 gene
… the p1 gene condition distinct tissue-specific pigmentation patterns. To elucidate the molecular basis of these allele-specific expression patterns, we characterized two novel P1-rw alleles, P1-rw1077 and P1-rw751::Ac. Structural analysis of P1-rw1077 indicated that this allele was generated by …
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Flavonoid diversification in Hibiscus and its impact on petal pattern evolution
… animal-mediated pollination through distinct pigmentation patterns on their petals. While their ecological significance is known, the developmental and evolutionary origins of these patterns remain less understood. In Hibiscus trionum, a new model system, bullseye patterns are formed by …
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Unraveling The Genetic Mechanisms Involved In The Evolution And Development Of The Thoracic Appendages In Insects
… These differences can range from the diverse pigmentation patterns between fore- and hindwings to changes in the size and shape of legs. The greatly enlarged jumping hind leg in crickets and grasshoppers is one of the best known illustrations of such diversity, representing a unique feature …
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Maintaining contact : design and use of acoustic signals in killer whales, Orcinus orca
… behavior. Individually-distinctive markings and pigmentation patterns were used to identify groups or individuals from which sounds were recorded. Recordings from each of the three matrilineal groups composing pod Al were made when each subgroup was isolated from the two other subgroups. Analysis …
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Role of subfunctionalized MYB paralogs in the evolution of pigmentation patterning in Clarkia
… study of the intricate spatial patterning of pigmentation, for example zebra stripes, butterfly wings, and flower spots. The study of plant pigmentation patterning is still in its infancy, but one surprising preliminary result is that patterning, specifically with anthocyanin pigments, always …
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BIO-ECOLOGICAL AND ANATOMICAL ASPECTS OF THE EUROPEAN EEL ANGUILLA ANGUILLA (L. 1758)
… of the peak of recruitment and the biometric and pigmentation patterns of glass eels. Moreover, I tested new floating traps as an alternative sampling method in three Sardinian estuaries to further deepen glass eels’ recruitment dynamics in Sardinia. Third, I analysed eels’ survival and growth …
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Mechanisms controlling cell shape patterning in petals
Angiosperms often exhibit various patterns on their petals. These patterns allow entomophilous plants to attract pollinators and also help them deal with abiotic stress such as UV-levels and water loss. While previous research largely focused on pigmentation patterns, structural patterns created by …
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The modification of Anthocyanin biosynthesis in dicotyledonous plants
… enhanced often displayed various aberrant petal pigmentation patterns, presumably associated with the phenomenon of 'silencing'. In white clover plants transformed with either the dicotyledonous or monocotyledonous anthocyanin regulatory genes on their own or in combmation, a large range of …
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The modification of Anthocyanin biosynthesis in dicotyledonous plants
… enhanced often displayed various aberrant petal pigmentation patterns, presumably associated with the phenomenon of 'silencing'. In white clover plants transformed with either the dicotyledonous or monocotyledonous anthocyanin regulatory genes on their own or in combmation, a large range of …