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 8 of 8 for “"Isolating mechanisms"”.
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Geographic scope, isolating mechanisms, and firm performance: antecedents and consequences of isolating mechanisms
… I examine the antecedents and consequences of isolating mechanisms or the barriers to imitation, focusing on the role of geographic scope of knowledge acquisition. I address the following four questions concerning the antecedents and consequences of isolating mechanisms with data from the …
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Cellular/Molecular Analysis of Interspecies Sterile Male Hybrids In Drosophila
… can lead to the evolution of reproductive isolating mechanisms that reduce gene flow between the populations and, upon secondary contact, result in distinct species. The process of speciation is, thus, what accounts for the multitude of species that contribute to the rich biodiversity on …
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The Effect of Follicle-Stimulating Hormone and Testosterone Propionate on the Reproduction of the Bull Snakes, Pituophis Melanoleucus Catenifer and Pituophis Melanoleucus Affinis; Accompanied with Analysis of Changes in Blood Protein Constituents Following Stimulation
The bull snake, Pituophis melanoleucus, was chosen for this experimentation for several reasons; (1) it is relatively abundant in Central Washington (2) it is a large snake, well able to withstand the effects of the frequent blood samplings which were necessary in this experimentation ... (3) the …
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The Degree of Reproductive Isolation in Gambusia affinis and Gambusia geiseri
No abstract prepared.
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A Geographic Mosaic of Speciation in Eurosta solidaginis
… on E. solidaginis flies. Reproductive isolating mechanisms of the flies across the boundary are also distributed in a geographic mosaic which supports our hypothesis that these flies show a Geographic Mosaic of Speciation.
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MATING COSTS, MALE CHOICE DISPLACEMENT, AND THE EFFECTS ON HYBRIDIZATION AND SPECIATION IN THE HAWAIIAN CRICKET LAUPALA (SUBFAMILY:TRIGONIDIINAE)
… may result in male choice conflicting with other isolating mechanisms. If so, this study may be another putative case of reinforcement, or it may be an entirely novel report of conflicting selection pressures within a hybrid zone. I suggest that further studies are needed to measure hybrid fitness …