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Lek Formation In Sage Grouse: The Effect Of Female Choice On Male Territory Settlement, Robert M. Gibson
Lek Formation In Sage Grouse: The Effect Of Female Choice On Male Territory Settlement, Robert M. Gibson
School of Biological Sciences: Faculty Publications
Previous studies of female choice in sage grouse, Centrocercus urophasianus, have identified two processes that could drive the local clustering of male territories at leks: (1) fidelity of females to previous mating sites (“temporal spillover” hypothesis), and (2) “spatial spillover” of matings from an attractive male to his immediate neighbors (“hotshot” hypothesis). The effects of each process on male territory settlement were investigated using observations of the resettlement of vacant territories and of individual site fidelity during a 7-year field study. The frequency with which vacant territories were resettled both within and between seasons increased with mating success of …
Characterization Of The TrnaTrp Genes Of Saccharomyces Cerevisiae, Audrey L. Atkin, R. W. Henry, K. L. Roy, J. B. Bell
Characterization Of The TrnaTrp Genes Of Saccharomyces Cerevisiae, Audrey L. Atkin, R. W. Henry, K. L. Roy, J. B. Bell
School of Biological Sciences: Faculty Publications
The purpose of this work was to examine the tRNATrp-encoding genes (tRNATrp) of Saccharomyces cerevisiae to gain insight as to why tRNATrp amber suppressors, isolated by conventional genetic techniques, have not been reported. The results herein indicate that the haploid yeast genome contains six tRNATrp genes which map to five or six chromosomes. Not only do the six genes have identical coding sequences but their introns are also identical. Gene replacement experiments indicate that five copies of tRNATrp are sufficient for cell viability. Thus, mutation of one tRNATrp gene to a suppressor in …
The Costs Of Female Choice In A Lekking Bird, Robert M. Gibson, Gwendolyn C. Bachman
The Costs Of Female Choice In A Lekking Bird, Robert M. Gibson, Gwendolyn C. Bachman
School of Biological Sciences: Faculty Publications
We investigated the costs of active female choice in sage grouse, Centrocercus urophasianus, a lekking species in which females make repeated, lengthy visits to leks to assess males before mating. Several potential costs were measured by monitoring changes in hens' ranging behavior, time budgets, and encounter rates with predators when they visited leks. Two costs were identified: hens moved further per day and encountered golden eagles, Aquila chrysaetos, more frequently when visiting leks. However, extra travel due to visiting leks increased predicted daily energetic expenditure by only about 1%, and the risk of predation by golden eagles over …