| ancestral polymorphisms in genetic markers obscure detection of evolutionarily distinct populations in the endangered florida grasshopper sparrow (ammodramus savannarum floridanus). | genetic analyses of bird subspecies designated as conservation units can address whether they represent units with independent evolutionary histories and provide insights into the evolutionary processes that determine the degree to which they are genetically distinct. here we use mitochondrial dna control region sequence and six microsatellite dna loci to examine phylogeographical structure and genetic differentiation among five north american grasshopper sparrow (ammodramus savannarum) populati ... | 2003 | 12753205 |