@article {122,
	title = {Testing for Spatial Autocorrelation in Ecological Studies},
	journal = {Ecography},
	volume = {21},
	year = {1998},
	month = {1998},
	pages = {423-429},
	abstract = {We describe a statistical method appropriate for the analysis of spatial autocorrelation in data varying in time as well as space. In particular, the technique was developed to address the issue of geographic synchrony in ecological variables that may change markedly from year to year such as population density of animals or seed production of trees. The method yields "modified correlograms" that test for significant autocorrelation between sites located within any given range of distances apart. This technique facilitates detecting and understanding spatial processes in a variety of ecological phenomena, including testing the plausibility of causational hypotheses using cross-correlational analyses. Several examples are discussed, including population densities of squirrels in Finland, winter densities of two hawk species in California, and acorn production and radial growth by individual blue oak Quercus douglasii trees in central coastal California.},
	url = {http://www.jstor.org/stable/3683177},
	author = {Koenig, W.D. and Knops, J.M.H.}
}
@article {108,
	title = {Limited hybridization between Quercus lobata and Quercus douglasii (Fagaceae) in a mixed stand in central coastal California},
	journal = {American Journal of Botany},
	volume = {89},
	year = {2002},
	month = {2002},
	pages = {1792-1798},
	abstract = {Many oak species are interfertile, and morphological and genetic evidence for hybridization is widespread. Here we use DNA microsatellite markers to characterize hybridization between two closely related oak species in a mixed stand in central coastal California, Quercus lobata (valley oak) and Q. douglasii (blue oak) (Fagaceae). Genotypes from four microsatellite loci indicate that many alleles are shared between the two species. However, each species harbors unique alleles, and allele frequencies differ significantly. A Bayesian analysis of genetic structure in the stand identified two highly differentiated genetic clusters, essentially corresponding to species assignment based on morphology. Data from the four loci were sufficient to assign all 135 trees to one of the two species. In addition, five putative hybrid individuals having intermediate morphologies could be assigned genetically to one or the other species, and all but one had low probability of hybrid ancestry. Overally, only six (4.6\%) trees showed >0.05 probability of hybrid ancestry, in all cases their probabilities for nonhybrid ancestry were substantially higher. We conclude that adult hybrids of Q. douglasii x Q. lobata are rare at this site and plasticity in morphological characters may lead to overestimates of hybridization among Quercus species.},
	url = {http://www.amjbot.org/cgi/content/abstract/89/11/1792},
	author = {Craft, K.J. and Ashley, M.V. and Koenig, W.D.}
}
@article {103,
	title = {Latitudinal decrease in acorn size in bur oak (Quercus macrocarpa) is due to environmental constraints, not avian dispersal},
	journal = {Botany},
	volume = {87},
	year = {2009},
	month = {2009},
	pages = {349-356},
	abstract = {The size of acorns produced by several species of eastern North American oaks decreases with latitude. We investigated three hypotheses for this pattern in the bur oak (Quercus macrocarpa Michx.) using samples collected over 2 years throughout the species},
	author = {Koenig, W.D. and Knops, J.M.H. and Dickinson, J.L. and Zuckerberg, B.}
}
