Sentences with phrase «by whitebark»
Charcoal and ancient pollen records suggest the niche space needed by whitebark pine is much larger than models estimate.
https://www.scientificamerican.com/ Not exact matches
By 2007, virtually no living whitebarks remained.
By 2008, much of the whitebark population of Yellowstone National Park would be similarly afflicted.
«By combining field data on seed and pollen production for whitebark pines with models that simulate mature cone production, this study helps to answer that question for these pines.»
Over the last decade, some populations of whitebark pines have declined by more than 90 percent.
Subalpine forests, dominated by Engelmann spruce and subalpine fir species or by lodgepole pine mixed with limber pine or whitebark pine in drier sites
For example, white pine blister rust, caused by the fungus (Cronartium ribicola), has put western white pine, limber pine, and whitebark pine in some areas of Montana in jeopardy (Smith et al. 2008).
But this new study by a team of scientists from the University of Wisconsin - Madison has found that the warming temperatures have resulted in mountain pine beetles increasingly invading high - elevation forests, like the whitebark pine forests of the northern Rocky Mountains, and attacking them.
The attack by mountain pine beetles is posing a major threat to the forest ecosystems of the whitebark pine forests.
His whitebark pine research plots in the White Cloud Mountains of Idaho were first attacked by mountain pine beetles in 2001.
If blister rust can be regarded as a steadily, if slow - moving, disaster for whitebark pine, the relatively dramatic and sudden attack of mountain pine beetles can be regarded as a biological firestorm, fueled by global warming, experts at a recent workshop sponsored by the Natural Resources Defense Council said.
YELLOWSTONE NATIONAL PARK - A history of fire suppression, an invasive fungal plague, and rampant insect infestation fueled by global warming add up to likely extinction for the whitebark pine and serious trouble for the grizzly bear and other species that depend on it, some scientists say.
In and around timberline, the whitebark pine would be replaced by shade - tolerant conifers - if fires didn't periodically remove the conifers and give the whitebark pines an opening.
«A weaker defense system may also be why we are seeing a strong preference now by the beetle for whitebark pine over lodgepole pine, which has long been its preferred host.»