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Keyword: Pinus albicaulis

Phenotypic selection on growth rhythm in whitebark pine under climatic conditions warmer than seed origins

Publications Posted on: May 22, 2019
Growth rhythm that is well synchronized with seasonal changes in local climatic conditions is understood to enhance fitness; however, rapid ongoing climate change threatens to disrupt this synchrony.

Best friends forever: The whitebark pine and Clark's nutcracker

Publications Posted on: October 05, 2018
It’s late fall in the high mountains of western North America and the whitebark pine (Pinus albicaulis) forests are alive with activity. Birds and mammals are feasting on the pine’s copious amounts of large seeds. When the cones ripen, the competition for the fatty, nutritious seeds - which contain “more energy than chocolate per unit of weight” according to the Cornell Laboratory of Ornithology - is a sight to see.

Fire enhances the complexity of forest structure in alpine treeline ecotones

Publications Posted on: October 05, 2018
Alpine treelines are expected to move upward in a warming climate, but downward in response to increases in wildfire. We studied the effects of fire on vegetation structure and composition across four alpine treeline ecotones extending from Abies lasiocarpa/Picea engelmannii forests at lower elevations, through Pinus albicaulis/Larix lyallii parkland, to alpine tundra.

Regeneration for resilience framework to support regeneration decisions for species with populations at risk of extirpation by white pine blister rust

Publications Posted on: October 05, 2018
Natural forests are increasingly invaded by nonnative pests and pathogens that threaten host species with population extirpation and cascading ecological impacts.

The big picture on whitebark pine

FS News Posted on: August 31, 2018
Throughout the western United States, whitebark pine is experiencing high mortality, leading to concern about long-term viability of whitebark pine and other species that depend on it. Two new studies of whitebark pine in the western U.S. show that this species continues to die-off in alarming numbers and identifies locations where forest managers may be able to encourage growth of young whitebark pines.

A landscape-level assessment of whitebark pine regeneration in the Rocky Mountains, USA

Publications Posted on: August 30, 2018
Whitebark pine (Pinus albicaulis Engelm.) has recently experienced high mortality due to multiple stressors, and future population viability may rely on natural regeneration. We assessed whitebark pine seedling densities throughout the US Rocky Mountains and identified stand, site, and climatic variables related to seedling presence based on data from 1,217 USDA Forest Service Forest Inventory and Analysis plots.

Landscape-scale assessments of whitebark pine

Science Spotlights Posted on: August 23, 2018
Forest inventory data show that more than half of all standing whitebark pine trees in the U.S. are dead. Regeneration of whitebark pine is widespread, especially in lodgepole pine stands, which suggests that active management of whitebark pine should target mixed-species stands to take advantage of natural regeneration. 

Whitebark pine distribution and regeneration in mixed-species stands

Projects Posted on: June 01, 2018
Whitebark pine (Pinus albicaulis) is an ecologically important species in high-altitude areas of the West due to the habitat and food source it provides for Clark’s nutcrackers, red squirrels, grizzly bears, and other animals. Whitebark pine stands have recently experienced high mortality due to wildfire, white pine blister rust, and a mountain pine beetle outbreak, leading to questions about the species’ long-term viability. This project seeks to quantify the current distribution and regeneration status of whitebark pine throughout its US range.

Predicting the Future to Save Whitebark Pine

Documents and Media Posted on: April 23, 2018
Rocky Mountain Research Station Research Ecologist Robert Keane and collaborators present guidelines for restoring whitebark pine under future climates based on an existing international rangewide restoration strategy and an extensive modeling experiment. Document Type: Other Documents

The effects of seed source health on whitebark pine (Pinus albicaulis) regeneration density after wildfire

Publications Posted on: October 07, 2016
Whitebark pine (Pinus albicaulis Engelm.) populations are declining nearly rangewide from a combination of factors, including mountain pine beetle (Dendroctonus ponderosae Hopkins, 1902) outbreaks, the exotic pathogen Cronartium ribicola J.C. Fisch. 1872, which causes the disease white pine blister rust, and successional replacement due to historical fire exclusion practices.

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