Allozyme variation at seven putative polymorphic gene loci (Fle, Idh, Mdh-2, Mdh-3, 6 Pgd-2, Pgi-2, Pgm) was quantified in an isolated Quercus macrocarpa population in northwestern Ontario, Canada. The bur oaks studied were slightly less genetically variable (He = 0.196, A = 3.43) than the Quercus subg. Lepidobalanus average. To assess the genetic differentiation within the topodeme, MORAN'S spatial autocorrelation coefficients were used for the nearest-neighbor map and correlograms. Results indicate that most alleles were randomly distributed in space. However, significant genetic patches were detected for two Fle-alleles. Patch width was inferred to be less than 10m. This spatial substructure may be due to limited gene flow and/or demographic factors. Spatially varying selection can be probably excluded as a spatial evolutionary force, since site conditions were very homogeneous.
165.3 (Allgemeines über Vererbung, Genetik und Züchtung, Variation [Praktische Anwendung siehe 232.13 und 232.311.3]) 176.1 (Dicotyledoneae [Siehe Anhang D])
