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 20 of 80 for “"reproductive isolation"”.
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The Degree of Reproductive Isolation in Gambusia affinis and Gambusia geiseri
No abstract prepared.
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The evolution of prezygotic reproductive isolation in the Drosophila pseudoobscura subgroup
… is to evaluate some mechanisms of prezygotic reproductive isolation in the D. pseudoobscura subgroup. I begin by evaluating how the evolution of female preferences and male sexual characters lead to reinforcement between Drosophila pseudoobscura and its congener D. persimils. In particular, I …
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Linking ecological divergence and reproductive isolation: a tale of two killifish
… need not always lead to the evolution of reproductive isolating barriers (RIBs). When the genes under ecological selection also confer reproductive isolation, ecological speciation occurs readily (Boughman 2001; Kirkpatrick and Ravigne 2002; Gavrilets 2004). However, when the genes under …
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Pheromone chemistry and reproductive isolation in the subfamily Lamiinae (Coleoptera: Cerambycidae)
… lamiines and to elucidate chemical mechanisms of reproductive isolation among sympatric species that share pheromone components. In Chapter 1, I summarize what is known about the pheromone chemistry of cerambycids, with emphasis on the subfamily Lamiinae. In Chapter 2, I identify the pheromone …
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EVALUATION OF POTENTIAL PRE-MATING REPRODUCTIVE ISOLATION IN TIGER BEETLES (CARABIDAE: CICINDELINAE)
… characteristics potentially responsible for this isolation, we conducted behavioral and morphological experiments with two pairs of tiger beetle species. Choice trials showed males use visual cues to trigger the pursuit of potential mates and prefer females who appear similar in color. Geometric …
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Tests of Reproductive Isolation Between the Fishes Fundulus heteroclitus and F. grandis
… suggesting the presence of relatively strong reproductive isolation between these species. The objective of this study was to elucidate barriers to reproduction between F. heteroclitus and F. grandis in the lab, as well as to quantify the relative strengths and contributions of various …
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Mechanisms for partial reproductive isolation in a Bombina hybrid zone in Romania
… have devoloped in allopatry can contribute to reproductive isolation in the case of secondary contact. Hybrid zones are ideal study systems in which to investigate mechanisms for the inhibition of gene flow. This thesis describes a mosaic hybrid zone between the ecologically differentiated …
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Genetics and Reproductive Isolation of Rhagoletis Flies (Fruit Fly, Eclosion, Speciation, Electrophoresis, Host Selection)
… in host selection and in maintenance of reproductive isolation among these sibling species and host-associated populations.
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The role of male-male aggressive signals in reproductive isolation between two hybridizing warblers
… extensively studied for its role in pre-mating reproductive isolation between species. Sometimes song fails to effectively isolate a species and hybrids are produced, giving an opportunity to investigate the mechanisms of how song might act as a reproductive barrier. The ways in which two …
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Adaptive radiation, speciation, and reproductive isolation in African weakly electric fish : (Genus Campylomormyrus, Mormyridae, Teleostei)
… the identified phylogenetic clades proved to be reproductively isolated biological species. This way I detected at least six species occurring in sympatry near Brazzaville/Kinshasa (Congo Basin). By combining molecular data and EOD analyses, I could show that there are three cryptic species, …
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The genetic basis of reproductive isolation in house mice: Studies of a European hybrid zone
… patterns that characterize the genetic basis of reproductive isolation. First, reproductive isolation is usually caused by incompatible substitutions at different, interacting loci. Second, the locations of genes contributing to reproductive isolation are biased toward the X chromosome. These …
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Gene linkage, ontogeny of gene expression, and reproductive isolation in Pomoxis annularis, P. nigromaculatus, and their hybrids
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:45:43Z Item is restricted indefinitely.
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The role of cultural divergence in reproductive isolation in a tropical bird, the rufous-collared sparrow (Zonotrichia capensis)
… recognition may be a critical component of reproductive isolation through female mate preference. I investigated the role of cultural divergence in reproductive isolation in a widespread Neotropical passerine the rufous-collared sparrow (Zonotrichia capensis). In Chapter II, I investigated, …
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Reproductive Isolation and Genetic Divergence in a Young "Species Flock" of Pupfishes (Cyprinodon sp.) from San Salvador Island, Bahamas
The study of the process of speciation is instrumental to understanding the species diversity observed today. Diverging populations are intriguing, because speciation has not reached an endpoint, yet the process that may eventually lead to distinct species can be studied. Systems that contain many …
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Latitudinal Variation in Thermal Tolerance and Preference of <i>Fundulus notatus</i> and <i>F. olivaceus</i>: Implications for Temperature Mediated Reproductive Isolation
<p>Temperature is one of the most pervasive and influential abiotic factors affecting the life histories of fish, regulating a host of physiological processes and influencing behavioral thermoregulation. <em>Fundulus notatus</em>, the blackstripe topminnow, and <em>F</em>.<em> olivaceus</em>, the …
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Reinforcement and cascade reinforcement in the lucania system: the effects of experimental design, sex, and heterospecific pairings on mate preference
… document these processes is to compare levels of reproductive isolation between areas of sympatry and allopatry (Servedio and Noor 2003; Hoskin and Higgie 2010; Pfennig 2016). This often involves using behavioral assays and metrics to determine conspecific or native mate preference in the …
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Diet, adaptation and the evolution of assortative mating in Ceratitis capitata
… barriers to gene flow between populations, or reproductive isolation, is increasingly understood to be a primary driver of speciation and thus biodiversity. ‘Ecological speciation’ is now supported by evidence from numerous studies in a range of natural populations. However, experimental tests …
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Patterns and processes of speciation in North American chorus frogs (Pseudacris)
… and this leads to genetic divergence and reproductive isolation. Here, I study the process of speciation and the patterns resulting from this process in the chorus frogs (Pseudacris). I first lay the foundation for this work by constructing phylogenies based on molecular data. I then …
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