the acorn is an edible nut of oak trees (quercus spp.) that had been used for human nutrition for a long time. besides nutritious components, acorn contains considerable amounts of phenolic substances. at present study, two different varieties of iranian oak acorns, namely, q. branti var. persica (qb) and qcastaneifolia var. castaneifolia (qc) were used. the total polyphenol content measured in...

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’ range. We found strong support for the hypothesis that abiotic factors, including both temperature and rainfall, constrain acorn size. There...

In 2000, we determined levels of damage by acorn weevils (Curculio spp.) and patterns of acorn fall in a northern red oak (Quercus rubra L.) seedling orchard in eastern Tennessee. The mean (ISE) production of acorns among 43 selected trees was 5,930 rt 586 acorns per tree with a maximum production level of 16,969 acorns for one tree. Trees were selected in the spring of 2000 based on abundance ...

We measured patterns of spatial synchrony in growth and reproduction by oaks using direct acorn surveys, published data on acorn production, and tree-ring chronologies. The two data sets involving acorn production both indicate that acorn crops are detectably synchronous over areas of at least 500 to 1,000 km not only within individual species but among species that require the same number of y...

Research into human-environment interaction in California prehistory often focuses on either the internal dynamics of adaptive decisions or the external impacts of environmental change. While both processes were surely driving prehistoric variability, integrating these approaches is not altogether straightforward. Here we outline an inclusive approach examining the exploitation of acorn habitat...

Frelich, Lee E.; Reich, Peter B.; Peterson, David W. 2015. Fire in upper Midwestern oak forest ecosystems: an oak forest restoration and management handbook. Gen. Tech. Rep. PNW-GTR-914. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 64 p. We reviewed the literature to synthesize what is known about the use of fire to maintain and restore oak f...

We compared five types of visual mast surveys with seed trap data from 105 white oaks (Quercus alba L.) during 1996-1997 in the Ouachita Mountains of Arkansas. We also evaluated these visual survey methods for their usefulness indetecting differences in acorn density among areas. Indices derived from all five methods were highly correlated with acorn densities derived from traps, and the Koenig...

The characteristics, uses, and management of oak woodlands and savannas in California and southern Spain are compared. There are many similarities between the Spanish dehesa and the California oak woodland. Both are located in Mediterranean climate zones, and are used predominantly for livestock grazing. However the Spanish dehesa is a more diverse and long-standing system of management. Produc...

Wild pigs (Sus scrofa) have been widely distributed by humans and significant populations now occur in oak-dominated ecosystems in California. Because they are omnivorous and forage by rooting, wild pigs have the potential to impact a wide variety of plants and animals directly by consumption and indirectly through disturbance. In 1998, we initiated a long-term study of the ecological effects o...