What concept might supersede neat geographical lines when describing future population structure based on modern genetic data?
Answer
Functional genetic clines related to temperature tolerance
Modern genomic comparisons reveal a more dynamic population structure than previously assumed based on traditional morphological subspecies divisions. If adaptation to local temperature extremes becomes the overriding selective pressure across the entire range—affecting populations in diverse geographies like Arizona highlands and Kansas lowlands—the resulting genetic structure may align not with established geographic borders, but with *functional* clines. These clines represent continuous gradations of adaptive alleles specifically linked to physiological tolerance, such as heat resistance, potentially overriding older, geography-based categorizations.
Related Questions
How is the Willow Flycatcher often recognized, contrasting with its subtle appearance?What specific ecological feature do Willow Flycatchers strongly depend on for breeding habitat?Which recognized Willow Flycatcher subspecies generally tends to breed at higher elevations than *E. t. traillii*?What is the primary anthropogenic engine currently influencing the rapid evolution of *Empidonax traillii*?What is the typical foraging strategy employed by the insectivorous Willow Flycatcher within its habitat?How does the documented genetic adaptation rate in the Willow Flycatcher compare to typical rates inferred from the fossil record?What concept might supersede neat geographical lines when describing future population structure based on modern genetic data?What subtle facial feature is often described as incomplete or weak on the Willow Flycatcher?In the Rocky Mountains, what local selective driver might favor Willow Flycatchers genetically predisposed to earlier breeding?For a migratory species like the Willow Flycatcher, where does adaptation pressure manifest besides the breeding grounds?