Bristlecone pine
| Bristlecone pines | |
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| A Great Basin bristlecone pine grove | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Pinales |
| Family: | Pinaceae |
| Genus: | Pinus |
| Subgenus: | Ducampopinus |
| Section: | Balfourianae |
| Species | |
The bristlecone pines are a small group of pine trees (Family Pinaceae, genus Pinus, subsection Balfourianae) that are thought to reach an age far greater than that of any other single living organism known, up to nearly 5,000 years.
There are three closely related species of bristlecone pine:
- Rocky Mountains Bristlecone Pine Pinus aristata in Colorado, New Mexico and Arizona
- Great Basin Bristlecone Pine Pinus longaeva in Utah, Nevada and eastern California
- Foxtail Pine Pinus balfouriana in California
Bristlecone pines grow in isolated groves at and just below the tree line. Because of cold temperatures, dry soils, high winds, and short growing seasons, the trees grow very slowly. The wood is very dense and resinous, and thus resistant to invasion by insects, fungi, and other potential pests.
The bristlecone pine has an intrinsically low rate of reproduction and regeneration, and it is thought that under present climatic and environmental conditions the rate of regeneration may be insufficient to sustain its population.[1] The species are on the International Union for Conservation of Nature (IUCN) red list.[1] Bristlecone pines are protected in a number of national parks such as the Ancient Bristlecone Pine Forest in the White Mountains of California and the Great Basin National Park in Nevada,[2][3] where cutting or gathering wood is prohibited.[2]
The green pine needles give the twisted branches a bottle-brush appearance. The name bristlecone pine refers to the dark purple female cones that bear incurved prickles on their surface.[3] These ancient trees have a fittingly gnarled and stunted appearance, especially those found at high altitudes,[4] and have reddish-brown bark with deep fissures.[5] As the tree ages, much of its vascular cambium layer may die. In very old specimens, often only a narrow strip of living tissue connects the roots to a handful of live branches.
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[edit] Species and range
At least some of the three species can hybridize in cultivation, but the ranges of wild populations do not overlap. The Colorado River and Green River produces a 260 km gap between the ranges of P. longaeva and P. aristata and the northern Owens Valley provides a 30 km gap between the ranges of P. longaeva and P. balfouriana.[6]
[edit] Oldest living organisms
The bristlecone pines are the oldest single living organisms known (though some plants form clonal colonies which may be many times older). The oldest bristlecone pines are single plants that have been alive for a little less than 5,000 years. These very old trees are of great importance in dendrochronology or tree-ring dating.
The oldest (non-clonal, acknowledged) living organism known is a bristlecone pine tree nicknamed "Methuselah" (after Methuselah, the longest-lived person in the Bible). It is located in the Ancient Bristlecone Pine Forest in the White Mountains of eastern California, however its precise location is undisclosed by the U.S. Forest Service to protect the tree from vandalism.[7] The age of Methuselah was measured by core samples in 1957 to be 4,789 years old.
In the Snake Range of eastern Nevada Donald R. Currey, a student of the University of North Carolina, was taking core samples of bristlecones in 1964. He discovered that "Prometheus" in a cirque below Wheeler Peak was over 4,000 years old. His coring tool broke, so the U.S. Forest service granted permission to cut down "Prometheus". 4,844 rings were counted on a cross-section of the tree, making "Prometheus" at least 4,844 years old, the oldest known non-clonal living thing.[8]
The other two species, Pinus balfouriana and Pinus aristata are also long-lived, though not to the extreme extent of P. longaeva; specimens of both have been measured or estimated to be up to 3,000 years old. It is rumored that a specimen older than "Methuselah" has been discovered, but this has not been widely publicized.[7]
The Rocky Mountain population is severely threatened by an introduced fungal disease known as white pine blister rust, and by pine beetles.[9]
[edit] See also
- Arctica islandica, the longest-living eumetazoan animal.
[edit] References
This article incorporates text from the ARKive fact-file "Bristlecone pine" under the Creative Commons Attribution-ShareAlike 3.0 Unported License and the GFDL.
- ^ a b "IUCN Red List". IUCN. http://www.iucnredlist.org. Retrieved 30 July 2011.
- ^ a b "Global Trees Campaign". 2008-03. http://www.globaltrees.org. Retrieved 30 July 2011.
- ^ a b "The Ancient Bristlecone Pine". 2003-08. http://www.sonic.net/bristlecone/home.html. Retrieved 30 July 2011.
- ^ "Pinus longaeva". 2008-03. http://www.fs.fed.us/database/feis/plants/tree/pinlon/introductory.html. Retrieved 30 July 2011.
- ^ "The Gymnosperm Database". 2008-03. http://www.conifers.org/. Retrieved 30 July 2011.
- ^ Fryer, Janet L (2004). "Pinus longaeva". U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. http://www.fs.fed.us/database/feis/plants/tree/pinlon/all.html.
- ^ a b Bain, G. Donald (2001). "Explore the Methuselah Grove". NOVA Online: Methuselah Tree. PBS. http://www.pbs.org/wgbh/nova/methuselah/explore.html.
- ^ Hall, Carl (1998-08-23). "Staying Alive". San Francisco Chronicle. http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/1998/08/23/SC72173.DTL.
- ^ Robbins, Jim (2010-09-27). "Old Trees May Soon Meet Their Match". The New York Times. http://www.nytimes.com/2010/09/28/science/28pines.html.
[edit] Further reading
- Bailey, D. K. 1970. Phytogeography and taxonomy of Pinus subsection Balfourianae. Ann. Missouri Bot. Gard. 57: 210-249.
- Richardson, D. M. (ed.). 1998. Ecology and Biogeography of Pinus. Cambridge University Press, Cambridge. 530 p. ISBN 0-521-55176-5.
[edit] External links
- Bristlecone pine media at ARKive
- Bristlecone pine website
- Arboretum de Villardebelle Images of cones (scroll to bottom of page)
- Gymnosperm Database - Pinus aristata
- Gymnosperm Database - Pinus longaeva
- Gymnosperm Database - Pinus balfouriana
- Prometheus: The Martyred One
- OpenRoad.TV (video story about the Ancient Bristlecone Pines)
