1. Distribution and Status of the Valley Oak (quercus Lobata Nee) in California
ثبت نشده
چکیده
The valley oak (Quercus lobata Neé) is among the largest and longest lived of the North American oaks, attaining trunk diameters up to 4 m, heights of 12 to 25 m, and ages of 300 years or more. Unique to California, this oak is also one of California’s most familiar and evocative icons. Where they occur, large valley oaks are focal visual and ecological elements of both developed and rural landscapes.
منابع مشابه
Regeneration of California Oak Woodlands 2001 - 20051
The first (1981-1984) and second (1991-1994) statewide inventories of California’s oak woodlands found low levels of regeneration for several common oak species. In 2001, a new statewide inventory of California’s oak woodlands was initiated, with 10 percent of field plots measured each year. The first five years of data (2001-2005) were used to examine regeneration and sapling distributions in ...
متن کاملEstablishing a Range-Wide Provenance Test in Valley Oak (Quercus lobata Née) at Two California Sites
We present the methods used to establish a provenance test in valley oak, Quercus lobata. Nearly 11,000 acorns were planted and 88 percent of those germinated. The resulting seedlings were measured after 1 and 2 years of growth, and were outplanted in the field in the winter of 2014-2015. This test represents a long-term resource for both research and conservation.
متن کاملLandscape genetics and population structure in Valley Oak ( Quercus lobata Née ) 1
Gene fl ow in plants occurs through the dispersal of pollen or seeds. Pollen-mediated gene fl ow is oft en extensive in plants that are pollinated by wind. Although long-distance (landscape-level) pollen movement is diffi cult to measure directly, paternity studies have shown that average pollination distances within stands of windpollinated trees is ten to hundreds of meters and pollen immigra...
متن کاملConserving the evolutionary potential of California valley oak (Quercus lobata Née): a multivariate genetic approach to conservation planning.
California valley oak (Quercus lobata Née) is a seriously threatened endemic oak species in California and a keystone species for foothill oak ecosystems. Urban and agricultural development affects a significant fraction of the species' range and predicted climate change is likely to dislocate many current populations. Here, we explore spatial patterns of multivariate genotypes and genetic dive...
متن کاملTree community shifts and Acorn Woodpecker population increases over three decades in a Californian oak woodland
Forest communities change in response to shifting climate, changing land use, and species introductions, as well as the interactions of established species. We surveyed the oak (Quercus L. spp.) community and Acorn Woodpecker (Melanerpes formicivorus (Swainson, 1827)) population within 230 ha of oak forest and savanna in central coastal California in 1979 and 2013 to assess demographic changes ...
متن کامل