04339nas a2200493   4500008004100000245007900041210006900120260000900189300001200198490000700210520295400217653001603171653002303187653002003210653001803230653004103248653001203289653001903301653001303320653003703333653002803370653002103398653002003419653002003439653001803459653001603477653001303493653001203506653002903518653003003547653002103577653001803598653002603616653001903642653002003661653001703681653002403698653002003722653001303742100001603755700001603771700001503787856004303802       1993                        eng d00aEcology of mast-fruiting in three species of North American deciduous oaks0 aEcology of mastfruiting in three species of North American decid  c1993  a528-5410 v743 aWe conducted an 8-yr study of flower and acorn production in three species of oak in east-central Missouri (USA): white oak (Quercus alba), red oak (Q. rubra), and black oak (Q. velutina). The goal was to evaluate whether mast -fruiting, the synchronous production of large seed crops followed by small seed crops, is simply a response to weather conditions or is actually an evolved reproductivity strategy. In this paper, we address four specific questions: (1) Are annual fluctuations in acron crop size the result of synchronous production of acorns by individuals? (2) Are large acorn crops the result of large flower crops and/or high survival of those flowers to mature fruit? (3) To what extent do weather variables account for variation in acorn production among years? (4) Does acorn crop size correlate negatively with prior acorn production? Red oak and white oak showed a greater degree of mast -fruiting than did black oak. Within a species, individuals tended to produce large acorn crops in the same years, but each species differed in which years they produced large crops. The size of a given acorn crop was determined by both flower abundance and survival of flowers to fruit. Principal components and multiple-regression analyses were used to describe the relationship between weather variables and acorn production. The first principal component explained the largest amount of the variation in black oak (R-2 = 0.55) and red oak (R-2 = 0.89). In white oak, two principal components combined to explain 77% of the variation in acorn production. The weather variables that were associated with these principal components included spring temperature (positive effect) and summer drought (negative effect). Past acorn production had a major impact on the size of the current acorn crop, with each species showing a different pattern. In black oak, the current acorn crop was negatively correlated with the crop 3 yr prior but positively correlated with the crop 2 yr prior. In red oak, acorn crop size 1, 2, and 3 yr prior had negative correlations with current acorn crop, while acorn crop size 4 yr prior was positively correlated. In white oak, there were negative correlations between acorn crop size and crop size 1, 2, and 4 yr prior but a positive correlation with the acorn crop size 3 yr prior. These data are consistent with the hypothesis that mast-fruiting species must store resources during some years in order to produce a mast crop. We discuss the possibility that these three species may have inherent cycles of reproduction that are modified by the impact of weather conditions, black oak with 2-yr cycles, white oak with 3-yr cycles, and red oak with 4-yr cycles. We conclude that the patterns of acorn production for black oak, red oak, and white oak are not simply responses to weather events but are also a function of prior reproductive events. This suggests that masting is an evolved reproductive strategy.10a(Fagaceae-)10a[26070-] Fagaceae-10aACORN-CROP-SIZE10aAngiospermae-10aClimatology-: Environmental-Sciences10aDicots-10aDicotyledones-10aDROUGHT-10aEcology-: Environmental-Sciences10aFagaceae-: Angiosperms-10aFLOWER-ABUNDANCE10aMissouri-: USA-10aNearctic-region10aNorth-America10aPhysiology-10aPlantae-10aPlants-10aQuercus-alba (Fagaceae-)10aQuercus-rubra (Fagaceae-)10aQuercus-velutina10aReproduction-10aREPRODUCTIVE-STRATEGY10aSpermatophyta-10aSpermatophytes-10aTEMPERATURE-10aUSA-: North-America10aVascular-Plants10aWEATHER-1 aSork, V.-L.1 aBramble, J.1 aSexton, O.  uhttps://quercus.myspecies.info/node/7900438nas a2200121   4500008004500000245009700045210006900142260001300211100001500224700001600239700001900255856004200274       In Press                    eng d    00aWho am I this time? The affinities and misbehaviors of Hill’s oak (Quercus ellipsoidalis).0 aWho am I this time The affinities and misbehaviors of Hill s oak  cIn press1 aHipp, A.L.1 aWeber, J.A.1 aSrivastava, A.  uhttps://quercus.myspecies.info/node/101930nas a2200193   4500008004100000245008800041210006900129260000900198300001200207490000700219520128300226653005101509653001801560653001701578653002801595100001501623700001601638856008201654       2008                        eng d00aTaxonomy of Hill’s Oak (Quercus ellipsoidalis: Fagaceae): Evidence from AFLP Data0 aTaxonomy of Hill s Oak Quercus ellipsoidalis Fagaceae Evidence f  c2008  a148-1580 v333 aAbstract:Quercus ellipsoidalis (Hill’s oak), an endemic of east-central North America, is morphologically similar to Q. coccinea (scarlet oak) and is subsumed into that species in several floristic treatments. This study uses data from more than 250 amplified fragment length polymorphism (AFLP) markers to investigate whether Q. coccinea and Q. ellipsoidalis are genetically distinct from one another. Whereas Q. coccinea and Q. ellipsoidalis separate from one another in all analyses, Q. velutina (black oak) populations collected from the geographic range of both Q. coccinea and Q. ellipsoidalis do not separate out by geographic region. This, combined with the strong differentiation between Q. coccinea and Q. velutina but weak differentiation between Q. ellipsoidalis and Q. velutina, supports the view that Q. coccinea and Q. ellipsoidalis are not simply regional variants of a single taxon. Moreover, while there is no evidence from the molecular data we collected of hybridization between Q. coccinea and Q. ellipsoidalis, the data suggest that there may be gene flow between Q. ellipsoidalis and Q. velutina. A clearer understanding of the relationships among these taxa is essential to understanding the taxonomy of Quercus section Lobate in eastern North America.10aAMPLIFIED FRAGMENT LENGTH POLYMORPHISMS (AFLP)10aHYBRIDIZATION10aOAK TAXONOMY10aQUERCUS SECTION LOBATAE1 aHipp, A.L.1 aWeber, J.A.  uhttp://www.ingentaconnect.com/content/aspt/sb/2008/00000033/00000001/art00017