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This dataset represents areas in the Medford district that are prone to frost. Frost prone areas used to evaluate impacts on timber harvest in the Medford district.BLM: (Bureau of Land Management) WOPR: (Western Oregon Plan Revision), ATM: (Atmospheric) PRMP: (Proposed Resource Managment Plan) This data is a PRMP release version of the data atm_aa_a_med_frost_poly.
The timing of life history traits is central to lifetime fitness and nowhere is this more evident or well studied as in the phenology of flowering in governing plant reproductive success. Recent changes in the timing of environmental events attributable to climate change, such as the date of snowmelt at high altitudes, which initiates the growing season, have had important repercussions for some common perennial herbaceous wildflower species. The phenology of flowering at the Rocky Mountain Biological Laboratory (Colorado, USA) is strongly influenced by date of snowmelt, which makes this site ideal for examining phenological responses to climate change. Flower buds of Delphinium barbeyi, Erigeron speciosus, and...
The effects that below-freezing temperature (frost) can have at times of year when it is unusual are an interesting ecological phenomenon that has received little attention. The physiological consequence of formation of ice crystals in plant tissue is often death of the plants, or at least of sensitive parts that can include flower buds, ovaries, and leaves. The loss of potential for sexual reproduction can have long-lasting effects on the demography of annuals and long-lived perennials, because the short-term negative effects of frosts can result in longer-term benefits through lowered populations of seed predators. The loss of host plants can have dramatic consequences for herbivores, even causing local extinctions,...
1 Precipitation in arid regions is temporally variable with much of it arriving in discrete, unpredictable pulses. Climate change models predict an increase in the variation of precipitation, with longer droughts and larger rainfall events, in addition to increased temperatures. 2 A life table response experiment (LTRE) was conducted with the herbaceous arid-land perennial Cryptantha flava (Boraginaceae) from 1997 to 2000, in order to determine how variation in precipitation affects asymptotic population growth (l) and vital rates. Variation in precipitation took two forms, through rainout shelters erected just before and during the 1999 spring growing season, and through naturally occurring variation over the 4...
    map background search result map search result map WOPR Medford Frost Prone Areas USGS 1:24000-scale Quadrangle for Frost, LA 1963 USGS 1:24000-scale Quadrangle for Frost, LA 1963 USGS 1:24000-scale Quadrangle for Frost, LA 1963 USGS 1:24000-scale Quadrangle for Frost, MN 1982 USGS 1:24000-scale Quadrangle for Frost, TX 1965 USGS 1:24000-scale Quadrangle for Frost, LA 1963 USGS 1:24000-scale Quadrangle for Frost, LA 1963 USGS 1:24000-scale Quadrangle for Frost, LA 1963 USGS 1:24000-scale Quadrangle for Frost, MN 1982 USGS 1:24000-scale Quadrangle for Frost, TX 1965 WOPR Medford Frost Prone Areas