@article {145,
	title = {Stabilizing selection for within-season flowering phenology confirms pollen limitation in a wind-pollinated tree},
	journal = {Journal of EcologyJournal of Ecology},
	volume = {100},
	number = {3},
	year = {2012},
	pages = {758-763},
	publisher = {Blackwell Publishing Ltd},
	abstract = {1. We examined the fitness consequences of pollen limitation in the valley oak (Quercus lobata N{\'e}e, Fagaceae), a wind-pollinated, predominantly outcrossing tree endemic to California, by examining the relationship between within-year phenology and acorn production over an 8~year period. 2. We predicted that pollen limitation should result in trees flowering relatively early and late in the season, when fewer trees are in flower, to experience reduced reproductive success compared to trees flowering during the middle of the season. 3. Despite considerable variation in acorn production from year to year, analyses confirmed this prediction and indicated that there was significant overall stabilizing selection on budburst date consistent with the pollen limitation hypothesis. 4. Analyses including herbivory and pre-budburst temperatures at individual trees revealed significant correlations with acorn production, but we still found significant stabilizing selection on budburst date even when considering these variables. 5.Synthesis.  Pollen limitation, as indicated by stabilizing selection on within-year flowering phenology, significantly affects acorn production by individual trees in Q.~lobata and has the potential to influence other key life-history features including masting behaviour and spatial synchrony.},
	keywords = {acorn production, herbivory, mast-fruiting, phenology, pollen limitation, Quercus lobata, reproductive ecology, wind-pollination},
	isbn = {1365-2745},
	author = {Koenig, Walter D. and Funk, Kyle A. and Kraft, Thomas S. and Carmen, William J. and Barringer, Brian C. and Knops, Johannes M. H.}
}
@article {147,
	title = {Fine-scale environmental control of hybridization in oaks},
	journal = {Molecular EcologyMolecular Ecology},
	year = {2012},
	pages = {n/a-n/a},
	abstract = {Natural hybridization is attracting much interest in modern speciation and conservation biology studies, but the underlying mechanisms remain poorly understood. In particular, it is unclear why environmental changes often increase hybridization rates. To study this question, we surveyed mating events in a mixed oak stand and developed a spatially explicit individual-based hybridization model. This model, where hybridization is frequency-dependent, pollen is nonlimiting and which allows immigrant pollen to compete with local pollen, takes into account species-specific pollen dispersal and sexual barriers to hybridization. The consequences of pollen limitation on hybridization were studied using another simple model. The results indicate that environmental changes could increase hybridization rates through two distinct mechanisms. First, by disrupting the spatial organization of communities, they should decrease the proportion of conspecific pollen available for mating, thus increasing hybridization rates. Second, by decreasing the density of conspecifics, they should increase pollen limitation and thus hybridization rates, as a consequence of chance pollination predominating over deterministic pollen competition. Altogether, our results point to a need for considering hybridization events at the appropriate level of organization and provide new insights into why hybridization rates generally increase in disturbed environments.},
	keywords = {disturbance, immigration, mass action model, paternity analysis, pollen limitation, Quercus petraea, Quercus robur},
	isbn = {1365-294X},
	author = {Lagache, L{\'e}lia and Klein, Etienne K. and Guichoux, Erwan and Petit, R{\'e}my J.}
}
