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Ecological conditions of secondary sexual dimorphism in salix glauca : fundamental and realized dimorphic niche
(University of Missouri--Columbia, 2006)
This thesis explores the dimorphic niche of ecological conditions hypothesis as the selective force behind secondary sexual dimorphism in Salix glauca, a dioecious willow shrub. The dimorphic niche hypothesis predicts trait ...
Mechanisms of call recognition in three sympatric species of Neoconocephalus (Orthoptera: Tettigoniidae) : asymmetrical interactions and evolutionary implications
(University of Missouri--Columbia, 2006)
Scientists have debated the hypothesis of reinforcement. Nevertheless, recent empirical and theoretical work have dispelled doubts about its existence. Reinforcement is most often studied by establishing one of its predicted ...
Conservation and ecology of breeding landbirds in a riparian restoration context
(University of Missouri--Columbia, 2006)
While $14 to $15 billion have been invested in 37,000+ river and stream restoration projects in North America since 1990, only 10% are monitored for biological function. My work examines factors that affect landbird ...
The interploidy hybridization barrier in Zea Mays L.
(University of Missouri--Columbia, 2006)
The failure of endosperm development due to interploidy crosses could be due to two reasons, neither of which has been studied on its own. 1) There is an imbalance of inherited imprinted loci in the endosperm (HAIG and ...
Centromere function and evolution in maize (Zea mays)
(University of Missouri--Columbia, 2006)
A dispensable supernumerary chromosome present in maize, the B chromosome, was the focus of many centromere studies. First, I examine the variation in copy number of centromeric elements and other repeats among different ...
Differential roles for hedgehog signaling in motor neuron development
(University of Missouri--Columbia, 2006)
Induction of neurons in the correct number and location is essential for the proper development and function of a nervous system. Signaling mediated by the Hedgehog (Hh) family of secreted proteins plays a vital role in ...