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Perry, Dennis (Northwestern University Medical School, Chicago, Ill.), and Hutton D. Slade. Intraspecific and interspecific transformation in streptococci. J. Bacteriol. 88:595-601. 1964.-Interspecific transformation reactions, employing streptomycin resistance as a marker, were performed with eight strains of streptococci belonging to three serological groups (F, H, and O) and one ungroupable ...

Levels of sequence divergence at mitochondrial loci are frequently used in phylogeographic analysis and species delimitation though single marker systems cannot assess bi-parental gene flow. In this investigation I compare the phylogeographic patterns revealed through the maternally inherited mitochondrial COI region and the paternally inherited 7(th) intron region of the Dby gene on the Y-chro...

This study tested the hypothesis that intraspecific variations in mating systems are correlated with differences in the capacity of peripheral arginine vasopressin (AVP) to facilitate partner preferences. It has been hypothesized that differences in environmental conditions, Kansas being more xeric than Illinois, are responsible for some of the intraspecific differences in the mating systems be...

Competition is a driving force regulating communities often considered an intermittent phenomenon, difficult to verify and potentially driven by environmental disturbances. Insecticides are agents of environmental disturbance that can potentially change ecological relationships and competitive outcomes, but this subject has seldom been examined. As the co-existing cereal grain beetle species Si...

A current focus of ecology is the investigation of spatial effects on population and community dynamics; however, spatiotemporal theory remains largely untested by empirical observations or experimental studies. For example, the segregation hypothesis predicts that intraspecific aggregation should increase the importance of intraspecific competition relative to interspecific competition, thereb...

To determine the role of natural enemies and host-plant quality in the population dynamics of Cameraria hamadryadella. we examined survival patterns and causes of mortality of a single population of C. hamadryadella during the epidemic vcars of 1982-1984 and the endemic years of 198,S-1990. C hamadryadella is a leat-mining microlepidopteran whose primary host is white oak, Quercus alba. Populat...