Bruce A. McPheron

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Question: Environmental disturbance can disrupt habitat choice as an ecological barrier to hybridization between host-specific parasites that mate on their host. Is environment-independent mate choice a sufficient barrier to prevent hybridization when ecological isolation breaks down? Hypothesis: Males and females will not discriminate between conspecific(More)
Speciation in animals is almost always envisioned as the split of an existing lineage into an ancestral and a derived species. An alternative speciation route is homoploid hybrid speciation in which two ancestral taxa give rise to a third, derived, species by hybridization without a change in chromosome number. Although theoretically possible it has been(More)
This report is one in a series of Southern Cooperative bulletins. Under the cooperative publication procedure, it becomes, in effect, a separate publication for each of the cooperating stations. The lead station for this study was the Abstract Marketing-and production-related data have been collected as part of the S-1021 Research Committee=s activity since(More)
Insects in the order Plecoptera (stoneflies) use a form of two-dimensional aerodynamic locomotion called surface skimming to move across water surfaces. Because their weight is supported by water, skimmers can achieve effective aerodynamic locomotion even with small wings and weak flight muscles. These mechanical features stimulated the hypothesis that(More)
The Rhagoletis pomonella species complex consists of at least four sibling species. They are highly host specific as larvae, and display great fidelity as adults. The only certain way to identify them is to know the host materials from which they came, because these fruit flies are very similar or identical, and have been especially recalcitrant to(More)
In this paper, we applied a neuro-fuzzy system to classify the morphologically indistinguishable Rhagoletis pomonella sibling species group. A carefully selected set of wing structure and shape variables were fuzzified using triangular membership functions. The neuro-fuzzy system NEFCLASS was applied to train the fly morphological datasets and a set of(More)
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