Five needle pines- I love them! It was the stately eastern white pine that introduced me to these trees of the five needle clan in my early years in Wisconsin & Michigan. I marveled at their majesty, once the dominant pine of north central and north eastern states, until mostly logged off. Now, about 1% of old growth remains in the US and Canada.
Coming west, I was introduced to other members of the five needle clan- limber pine, whitebark pine, bristlecone pine, and the magnificent western white pine. I’ve found with the exception of the western white pine, the others are difficult to differentiate without examining the cone. The sneaky limber pine can be found at both mid and higher elevations which is a lookalike, sharing the same space as the others, making a fun 3- tree ID game.
It is the whitebark pine that has held my interest more than most for various reasons. First, much like the bristlecone pine, it’s found in high elevations which I’m attracted to for stunning alpine meadows and peak bagging. In Utah that means the Uintahs, high plateaus, and Wasatch mountains, generally found above 10,000 feet.
Secondly, whitebark pine has been struggling from a plethora of assaults, and has been placed on the threatened species list by the US Fish and Wildlife Service. Populations of whitebark pine are declining throughout most of the species range because of high levels of mortality from an exotic fungal pathogen that causes the disease white pine blister rust in five-needle pines, and periodic upsurges of the endemic mountain pine beetle. The absence of fire in some forests has also led to advanced succession of shade-tolerant spruce/fir species with subsequent reductions in whitebark pine. Finally, increased atmospheric warming and associated effects from altered precipitation patterns further threaten to reduce the geographic distribution of the species.
As a keystone species, precipitous declines in whitebark pine have cascading effects throughout the ecosystem primarily because of the subalpine and treeline positions the species occupies. When forest stands succumb to mortality, few if any other species exist to fill the structural and functional roles of whitebark pine. Notably, whitebark pine presence dampens snow melt, stabilizes soils, provides cover and birthing habitat, and its seeds are highly nutritious and consumed by a wide array of vertebrate species. For over thirty years researchers and managers have sought to understand whitebark pine ecology, and to devise and implement procedures to reduce population decline and restore these valuable high-elevation ecosystems.
Last, many of my favorite critters, including us humans, are dependent on this pine. Grizzlies and black bears feast on the cones, as do Clark’s Nutcrackers, Steller’s Jays, Pine Grosbeaks, and a host of small rodents. Many native tribes would harvest the highly nutritional cones, similar to the pinyon pine in food value.
This is Jack Green for Bridgerland Audubon Society, and I’m Wild About Utah and its vanishing Whitebark pines!
Credits:
Picture: Whitebark Pine, Courtesy US National Park Service, Jen Hooke, Photographer
Audio: Courtesy & © Kevin Colver https://wildstore.wildsanctuary.com/
Text: Jack Greene, Bridgerland Audubon, https://bridgerlandaudubon.org/
Additional Reading: Lyle W Bingham, Webmaster, and Jack Greene, Author, Bridgerland Audubon, https://bridgerlandaudubon.org/
Additional Reading:
Jack Greene’s Postings on Wild About Utah, https://wildaboututah.org/author/jack/
Whitebark Pine, National Park Service, https://www.nps.gov/articles/000/whitebark-pine-klamath-network.htm
Whitebark Pine (Pinus albicaulis), U.S. Fish & Wildlife Service, https://www.fws.gov/species/whitebark-pine-pinus-albicaulis
Apodaca, Nicolas, The Future of White Pines in the West, Sustainability Education, University of Utah, March 20, 2019, https://sustainability.utah.edu/the-future-of-white-pines-in-the-west/
Whitebark Pine Ecosystem Foundation, https://whitebarkfound.org/
