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 15 of 15 for “"color morphs"”.
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Genetic, Morphological, and Behavioral Analysis of the Oklahoma Salamander (Eurycea Tynerensis) in Southwestern Missouri
… of Eurycea tynerensis which differed in coloration and life history mode. Using morphometrics and behavioral trials, I tested two sympatric color morphs for the presence of a cryptic species. I also obtained sequence data from the mitochondrial cytochrome-b gene of 21 salamanders, …
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Melanin as an Oto-Protective Pigment in Two Fish Species: <i> Poecilia Latipinna </i> and <i>Cyprinus Carpio </i>
… dark pigment found in most organisms that gives color to the skin, hair, feathers, and eyes of vertebrates. While melanin is known to also be present in the stria vascularis of the mammalian cochlea, its function in the inner ear is still unknown. Some previous studies have indicated that melanin …
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Divergence of Threespine Stickleback That Differ in Nuptial Coloration
… We address these questions with two freshwater color morphs, red and black, of the threespine stickleback fish (Gasterosteus aculeatus) from the northwest United States, in which a shift from red to black nuptial coloration occurred in several locations following glacial retreat. We measured …
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Responses to salinity of color polymorphs in two populations of the sea star, Pisaster achraceus
… to determine if varying salinities, animal color, or location affect the physiology of these sea stars. The three responses analyzed were aerobic respiration, ammonia excretion, and self-righting. The tested variables included two different color morphs (orange and purple) of <em>P. …
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The Maintenance of Male Color Polymorphism in Poecilia parae
<p>Genetic color polymorphisms are common in nature, and a major challenge for evolutionary biologists has been to understand how they are maintained despite the effects of directional selection. Recent studies suggest that frequency-dependent selection may explain the persistence of intraspecific …
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A snapshot of color: Exploring the ecological and genetic basis of color variation in the Neotropical tortoise beetle, Chelymorpha alternans (chrysomelidae:cassidinae)
… how life’s diversity is shaped and maintained, color polymorphisms serve as a powerful tool to connect phenotypic variation with the ecological processes that influence them and the genomic factors that maintain them. My dissertation focuses on a polymorphic species within a unique and striking …
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Molecular Genetic Assessment of Population Structure, Paternity, and Sex Ratios for the Reddish Egret
… 4) assess genetic differentiation between color morphs, 5) clarify subspecies status of E. r. dickeyi, a completely dark morph population located in and around Baja, Mexico, 6) assess paternity of nest mates, 7) determine offspring sex ratio. We collected blood samples of244 nestlings, each …
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Poison frog warning signals: From the rainforest to the genome and back again
… species use warning signals (e.g. bright coloration) to alert predators to the presence of a secondary defense (e.g., spines, toxins, etc). The presence of a conspicuous signal in combination with a secondary defense is thought to increase the efficiency of learned avoidance by predators …
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Characterizing the Innate Immunity in the Hawaiian Coral Montipora capitata
… Bay, Oahu, Hawaii. This coral occurs in two color morphs, orange and red, and is susceptible to the tissue loss disease Montipora white syndrome (MWS). MWS disease prevalence within Kaneohe Bay varies, with lower prevalence in the North than South Bay and with orange colonies more susceptible …
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Phenotypic and Genetic Diversity in the Sea Urchin Lytechinus Variegatus
<p>Diversity in coloration is a common phenomenon in marine invertebrates, although the ecological significance of the diversity is often unknown. Patterns of geographic variability, particularly with respect to color phenotypes, are evident in many organisms and may provide visual evidence of …
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Quantification of insecticide resistance in the tobacco-adapted form of the green peach aphid, Myzus persicae (Sulzer)(Hemiptera: Aphididae)
… colonies (136) including red, green, and orange color morphs were screened for total esterase activity using microplate assay with 1-Naphthyl acetate as the substrate. The green morphs generally had lower esterase levels than the red and orange morphs. All orange morphs had among the highest …
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The generation and maintenance of diversity in a rapid adaptive radiation
… (e.g. trophic morphology, tooth shape, color patterns, behavior, development). The unique characteristics of this system have produced unparalleled diversity with very little genetic differentiation between species. This dissertation is composed of four studies addressing different …
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Wintering Reddish Egret (Egretta Rufescens) Foraging Response To Environmental Variability On The Southern Texas Gulf Coast
… difference in foraging response between the two color morphs. This study will help in furthering knowledge of Reddish Egret winter foraging preferences and may help inform conservation actions including suitable habitat identification and protection in the future.
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The Phenotypic Impact of Transgenic Flower Color Variation in Ipomoea quamoclit.
… in pollen and ova fitness between the color morphs.</p> <p>The single genetic change to create blue-flowering <em>I. quamoclit</em> resulted in changes in almost every trait measured. Overall, red plants had much higher fitness than blue plants, regardless of pot size. The interaction …
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Causes and consequences of color polymorphism in Rambur’s forktail (Ischnura ramburii)
… in which to study how female variation evolves. Color polymorphic damselflies typically contain one female morph that resembles the male (“andromorph”) and one or more alternative morphs with distinctive coloration (“gynomorphs” or “heteromorphs”). My thesis draws upon the unique context of a …