Ironwood Forest National Monument

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Ironwood Forest National Monument
Ironwood Forest National Monument 2016 1.jpg
Saguaro forest in Ironwood Forest National Monument
USA Arizona relief location map.svg
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Location Pima County & Pinal County, Arizona, United States
Nearest city Tucson, AZ
Coordinates 32°27′32″N111°34′00″W / 32.4589576°N 111.5667845°W / 32.4589576; -111.5667845 [1]
Area129,055 acres (52,227 ha) [3]
EstablishedJune 9, 2000
Governing body U.S. Bureau of Land Management
Website Ironwood Forest National Monument

Ironwood Forest National Monument is located in the Sonoran Desert of Arizona. Created by Bill Clinton by Presidential Proclamation 7320 on June 9, 2000, the monument is managed by the Bureau of Land Management, an agency within the United States Department of the Interior. The monument covers 129,055 acres (52,227 ha), [3] of which 59,573 acres (24,108 ha) are non-federal and include private land holdings and Arizona State School Trust lands.

Contents

A significant concentration of ironwood (also known as desert ironwood, Olneya tesota ) trees are found in the monument, along with two federally recognized endangered animal and plant species. More than 200 Hohokam archaeological sites have been identified in the monument, dated between 600 and 1450.

Flora and fauna

Ragged Top, Ironwood Forest National Monument, Arizona. Ironwood Forest NM (9403760591).jpg
Ragged Top, Ironwood Forest National Monument, Arizona.
Ragged Top & saguaro forest, Ironwood Forest National Monument Carnegiea gigantea - Ragged top, late afternoon.jpg
Ragged Top & saguaro forest, Ironwood Forest National Monument

Flora

An array of flora are present in the Ironwood Forest National Monument. The lower elevations are in the Sonoran Desert ecoregion. One of the notable trees native here is the elephant tree ( Bursera microphylla ). [4] Small populations of the endangered Nichols turk's head cactus, although not found among ironwood trees, occur in very localized limestone-rich areas within the monument.

Ironwood trees

The desert ironwood ( Olneya tesota ) is a very long-lived tree, with some specimens estimated to be more than 800 years old. [5] Desert ironwood is a keystone species because it provides a nursery environment of shade and protection that enables young seedlings of other species to become established despite the harsh desert climate, where daytime high temperatures can exceed 105 °F (41 °C). The ironwood also provides shade and roosting area habitats for birds. Its smoky lavender-colored blossoms provide nectar for bees and other insects, as well as forage for animals. The blossoms produce bean pods which also provide food for desert animals.

Prehistoric ecology

Lists of dominant plants in the prehistoric ecology and plant community of the Waterman Mountains area in the monument have been published in a sequence that currently dates back to the last glacial period, the Late Wisconsin glacial period. Dominant trees of that era, based upon pollen records, were Utah juniper ( Juniperus osteosperma ), single-leaf pinyon ( Pinus monophylla ), and redberry juniper ( Juniperus pinchotii ), and understory plants included Monardella arizonica . [4]

Fauna

According to Proclamation 7320, 674 plant and animal species have been identified in the Silver Bell Mountains within the monument, including 64 species of mammals and 57 species of birds, although the Bureau of Land Management has been unable to verify those claims. Recent studies by the Arizona-Sonora Desert Museum, however, have documented 560 plant species. [6] Resident birdwatchers have documented more than 80 species of migratory and non-migratory birds. [7]

One specimen of the endangered lesser long-nosed bat (Leptonycteris curasoae) and a night roost were documented within the monument by bat researchers Karen Krebbs and Yar Petryszyn. They concluded that while the monument may be an important feeding stopover during spring migrations, the presence of L. curasoae in the monument is probably low or incidental. [8] Leptonycteris curasoae is one of only a few bat species that migrate long distances, coming from as far south as Jalisco, Mexico, more than 1,600 miles (2,570 km).

The Arizona desert bighorn sheep herd located within the monument is the last remaining relict population of desert bighorn sheep in southeastern Arizona, having first migrated into North America during the Pleistocene epoch. One or two specimens of the cactus ferruginous pygmy owl, which was listed as an endangered species in March 1997 and delisted by court order April 14, 2006, have been found within and near the monument by licensed surveyors. [9]

History

The Hohokam people were the first miners in the area. They mined turquoise in the Silver Bell Mountains. Silver and copper mining began in the Silver Bell Mountains around 1850 and continues today. Bighorn sheep ewes prefer mine tailings for lambing grounds because the high, steep and open terrain enables them to see and escape from predators.

Activities

The Ironwood Forest National Monument is managed for multiple uses including recreation, cattle grazing and mining, although new mining claims and motorized off-road travel are prohibited by the establishing Proclamation. Livestock grazing, which has occurred continuously for at least the last 125 years within the monument, is currently managed at very light or conservative levels of approximately one cow per every 300 to 400 acres (1.6 km2). Domestic sheep and goats are prohibited as a protection to the bighorn sheep. The monument offers almost no surface water but contains sufficient groundwater resources.

The cattle ranchers maintain more than 80 individual man-made water sources within the monument, in addition to the 14 water sources maintained by the Arizona Game and Fish Department and the Arizona Desert Bighorn Sheep Society. The presence of human-supplied water supports the exceptional abundance of birds, mule deer, coyotes, foxes, bobcats, mountain lions and other wildlife found in the monument. [10]

See also

Related Research Articles

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<span class="mw-page-title-main">Sonoran Desert</span> Desert in Mexico and the United States

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<span class="mw-page-title-main">Aridoamerica</span> Ecological region of North America

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<i>Olneya</i> Genus of legumes

Olneya tesota is a perennial flowering tree of the family Fabaceae, legumes, which is commonly known as ironwood, desert ironwood, or palo fierro in Spanish. It is the only species in the monotypic genus Olneya. This tree is part of the western Sonoran Desert in Mexico and United States.

<i>Bursera microphylla</i> Species of flowering plant

Bursera microphylla, known by the common name elephant tree in English or 'torote' in Spanish, is a tree in genus Bursera. It grows into a distinctive sculptural form, with a thickened, water-storing or caudiciform trunk. It is found in the southwestern United States and northwestern Mexico.

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<i>Phoradendron californicum</i> Species of flowering plant

Phoradendron californicum, the desert mistletoe or mesquite mistletoe, is a hemiparasitic plant native to southern California, Nevada, Arizona, Sonora, Sinaloa and Baja California. It can be found in the Mojave and Sonoran Deserts at elevations of up to 1400 m.

<span class="mw-page-title-main">Mexican ironwood carvings</span>

Mexican ironwood carving is a Mexican tradition of carving the wood of the Olneya tesota tree, a Sonora Desert tree commonly called ironwood.

<span class="mw-page-title-main">Los Robles Archaeological District</span> Archaeological site in Arizona, United States

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Peniocereus striatus is a species of cactus known by several common names, including gearstem cactus, cardoncillo, jacamatraca, sacamatraca, and dahlia-rooted cactus. It is endemic to the Sonoran Desert, where it occurs in Baja California, Sinaloa, and Sonora in Mexico and Arizona in the United States.

<span class="mw-page-title-main">Sand to Snow National Monument</span> National monument in California, United States

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<span class="mw-page-title-main">Ragged Top</span> Landform in Pima County, Arizona

Ragged Top is a 3,907-foot-elevation (1,191 m) mountain summit located within Ironwood Forest National Monument, in Pima County of southern Arizona. It is situated 35 miles northwest of Tucson, in the Silver Bell Mountains, where it rises over 1,700 feet (520 m) above the surrounding terrain as a landmark of the area. Ragged Top is the biological and geological crown jewel of the monument for sightseeing and wildlife viewing, such as the Desert bighorn sheep and the desert tortoise. Ragged Top contains the greatest richness of species within the Sonoran Desert, including 401 plant species. Cathestecum erectum is only found on Ragged Top in the state of Arizona. Saguaro and ironwood forests cover the bajadas surrounding this mountain. This geographical feature lies within the Gila River drainage basin. Four small arches are located on this mountain.

References

  1. "Ironwood Forest National Monument". Geographic Names Information System . United States Geological Survey, United States Department of the Interior . Retrieved 2011-08-22.
  2. "Ironwood Forest National Monument". Geographic Names Information System . United States Geological Survey, United States Department of the Interior . Retrieved 2011-08-22.
  3. 1 2 https://www.blm.gov/sites/blm.gov/files/Monuments_Q2_2020.pdf [ bare URL PDF ]
  4. 1 2 C. Michael Hogan. 2009. Elephant Tree: Bursera microphylla, GlobalTwitcher.com, ed. N. Stromberg
  5. Suzán, Humberto; Nabhan, Gary P.; Patten, Duncan T. (October 1996). "The Importance of Olneya tesota as a Nurse Plant in the Sonoran Desert". Journal of Vegetation Science. 7 (5): 635–644. Bibcode:1996JVegS...7..635S. doi:10.2307/3236375. JSTOR   3236375 . Retrieved January 1, 2021.
  6. Devender, Thomas R. Van; Wiens, John F.; Dimmitt, Mark. "Biological Survey of Ironwood Forest National Monument, Vascular Flora". desertmuseum.org. Arizona-Sonora Desert Museum. Retrieved January 1, 2021.
  7. Public comments submitted to Bureau of Land Management regarding the Ironwood Forest National Monument Draft Resource Management Plan and Environmental Impact Statement, May 30, 2007.
  8. Biological Survey of Ironwood Forest National Monument, Karen Krebbs and Yar Petryszyn, Arizona Sonora Desert Museum
  9. Cactus Ferruginous Pygmy Owl records of US Fish and Wildlife Service
  10. "Wildlife Water Developments and Desert Bighorn Sheep in the Southwestern United States." 2005. Arizona Desert Bighorn Sheep Society. * "Archived copy" (PDF). Archived from the original (PDF) on 2007-09-20. Retrieved 2007-07-08.{{cite web}}: CS1 maint: archived copy as title (link)