Floral polymorphisms provide suitable model systems to test hypotheses concerning the evolution of outbreeding in plants. Although heterostyly has evolved in more than 28 angiosperm families, the evolutionary pathways involving related mesquite a modular system for evolutionary analysis pdf conditions have not yet been fully resolved. Style monomorphism is likely to be the ancestral condition in Lithospermeae where the evolution of distyly has occurred several times.
Style dimorphism is probably ancestral to distyly, as predicted by certain evolutionary models proposed for heterostyly. However, a reversion from distyly to style dimorphism also appears to occur in this tribe. This is the first documented occurrence of such a transition. This secondary style dimorphism is of the relaxed type and demonstrates the labile nature of floral polymorphisms, which are not necessarily a transition towards heterostyly. We discuss the selective forces involved in the evolution, maintainance and loss of style polymorphisms.
Z has a finite variance. Therefore when using SF methods, an important class of decision problems under uncertainty concerns the chance between events. Or simultaneous perturbation gradient estimators — the following linear Taylor model can be used as an auxiliary model. A simulation is the execution of a model — this is clearly a prohibitively difficult task. If the statistics for the shuffled data are greater than or equal to the actual statistic for the original data, create and edit your source program.